Make sure you have the prerequisite, a JVM (http://wiki.eclipse.org/Eclipse/Installation#Install_a_JVM) installed.
This will be a JRE and JDK package.
There are a number of sources which includes: http://www.oracle.com/technetwork/java/javase/downloads/index.html.
This is caused when java is updated. You have to delete in environement path : C:**ProgramData\Oracle\Java\javapath**
Please check if you got the x64 edition of eclipse. Someone answered this just a few hours ago.
Better you update your eclipse by clicking it on help >> check for updates, also you can start eclipse by entering command in command prompt eclipse -clean.
Hope this will help you.
Your application (Eclipse) needs more memory and JVM is not allocating enough.You can increase the amount of memory JVM allocates by following the answers given here
This happened to me when deleting some Equinox package from my plugins
directory, make sure this is not the case.
I moved workbench.xmi located at workspace/.metadata/.plugins/org.eclipse.e4.workbench/workbench.xmi to a backup folder. Then started eclipse and waited for all background processes to finish. Then I closed eclipse and moved my backup copy of workbench.xmi back (overwriting the one created with the last launch). Eclipse launched fine and I got all my settings back.
I know it's a bit old but I ran in the same problem today. I wanted to install eclipse on my vm with xubuntu. Because I've had problems with the latest eclipse version 2019-06 I tried with Oxygen. So I went to eclipse.org and downloaded oxygen. When running oxygen, the problem with merketplace not reachable occurs. So I downloaded the eclipse installer not immediatly the oxygen. After that I can use eclipse as expectet ( all versions)
If Anybody Is using prior version then Jdk 8 update 20 and getting this Issue Please Remove the following from eclipse.ini file
-XX:+UseStringDeduplication
As StringDeduplication was added in later version of JDK 8 in update 20 For StringDeduplication Clarification check this By Fabian Lange https://blog.codecentric.de/en/2014/08/string-deduplication-new-feature-java-8-update-20-2/
You can use this configuration:
-startup
plugins/org.eclipse.equinox.launcher_1.3.0.v20120522-1813.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.gtk.linux.x86_64_1.1.200.v20120913-144807
-showsplash
org.eclipse.platform
--launcher.XXMaxPermSize
256m
--launcher.defaultAction
openFile
-vmargs
-Xms512m
-Xmx1024m
-XX:+UseParallelGC
-XX:PermSize=256M
-XX:MaxPermSize=512M
I've solved this issue by installing a JDK (v7 update 80) whereas I had only had the JRE installed before.
Note: This was for IBM's RTC software (built on Eclipse).
Thanks a lot guys!
I overlooked my ECLIPSE VERSION it was 64Bit and 3.6
I had to make sure it's 32Bit Eclipse, 32 Bit JVM so i uninstalled Eclipse & all JVM for clean start. Installed 32Bit JDK1.6 from here and 32Bit Eclipse from here
SOLVED:
Because I had installed the Oracle Java 7 it had changed the default Java to Oracle Java 7, however it needed to be the Open JDK.
To fix, open up terminal and type
sudo update-alternatives --config java
This brings up a list of the different types of Java. Simply select the Open JDK.
Installig Eclispe ADT from market place solved this problem for me.
./eclipse -clean -refresh
as mentioned in comment by sulai Dec 20 '12 at 12:46, that worked for me.
However, on the Mac OS X, I had to figure out how to get to ./eclipse
Here's the solution:
cd Eclipse.app/Contents/MacOS/
Thank you Andrew's comment for this post: https://stackoverflow.com/a/1783448/2162226
This worked for me:
I closed all the other memory intensive applications on my Windows 7 machine. And I tried to open Eclipse, and, voila, it worked.
I got this error (September 2020) during an automatic upgrade.
The solution was to add:
http://download.eclipse.org/releases/2020-09
to the list of Available Software Sites.
I also disabled:
http://download.eclipse.org/eclipse/updates/4.15
and several more with release numbers earlier than 4.15, but I don't think that was the important part.
use the configuration below;
-startup
plugins/org.eclipse.equinox.launcher_1.3.0.v20130327-1440.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.win32.win32.x86_64_1.1.200.v20130807-1835
-product
org.springsource.ggts.ide
--launcher.defaultAction
openFile
--launcher.XXMaxPermSize
256M
-vm
C:\Program Files\Java\jdk1.7.0_51\jre\bin\javaw.exe
-vmargs
-Dorg.eclipse.swt.browser.IEVersion=10001
-Dgrails.console.enable.interactive=false
-Dgrails.console.enable.terminal=false
-Djline.terminal=jline.UnsupportedTerminal
-Dgrails.console.class=grails.build.logging.GrailsEclipseConsole
-Dosgi.requiredJavaVersion=1.6
-Xms40m
-Xmx768m
-XX:MaxPermSize=256m
-Dorg.eclipse.swt.browser.IEVersion=10001
In your config.ini
file of eclipse eclipse\configuration\config.ini
check this three things:
osgi.framework=file\:plugins\\org.eclipse.osgi_3.4.2.R34x_v20080826-1230.jar
osgi.bundles=reference\:file\:org.eclipse.equinox.simpleconfigurator_1.0.0.v20080604.jar@1\:start
org.eclipse.equinox.simpleconfigurator.configUrl=file\:org.eclipse.equinox.simpleconfigurator\\bundles.info
And check whether these jars are in place or not, the jar files depend upon your version of eclipse .
I don't think you need to change the MaxPermSize to 1024m. This works for me:
-startup
plugins/org.eclipse.equinox.launcher_1.0.200.v20090520.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.win32.win32.x86_1.0.200.v20090519
-product
org.eclipse.epp.package.jee.product
--launcher.XXMaxPermSize
256M
-showsplash
org.eclipse.platform
--launcher.XXMaxPermSize
256m
-vmargs
-Dosgi.requiredJavaVersion=1.5
-Xms256m
-Xmx1024m
-XX:PermSize=64m
-XX:MaxPermSize=128m
in my opinion, if after trying all solution nothing wors then simply delete eclipse folder from your C://use/{pc}/eclipse and then again install the same eclipse . You will get all your data no need to worry.
This happens because of unexpected shutdown of your eclipse
i fought with eclipse 3.5.0 (galileo) for days, i had to use this version because I am doing blackberry development and eclipse comes bundle with blackberry specifics so i need to use the package they bundled, which was not 3.5.0 (not the 3.5.1) , BUT SirFabel saved the day, thanks to all who contributed to this post
I used 3.5.0 and did "Set the following system property in you eclipse.ini file: -Dorg.eclipse.ecf.provider.filetransfer.excludeContributors=org.eclipse.ecf.provider.filetransfer.httpclient For more details on this: wiki.eclipse.org/… - Configure only the HTTP and HTTPS proxies. Not SOCKS!! "
and I am able to get through my companies proxy!!!!
You can implement your own method to do that for you, I recommend you to use something such as this. Using DecimalFormat
and MessageFormat
. With this method you can use pretty much whatever you want (String,Integer,Float,Double
) and the output will be always right.
import java.text.DecimalFormat;
import java.text.MessageFormat;
/**
* Created by Yamil Garcia Hernandez on 25/4/16.
*/
public class test {
// Constants
public static final DecimalFormat phoneFormatD = new DecimalFormat("0000000000");
public static final MessageFormat phoneFormatM = new MessageFormat("({0}) {1}-{2}");
// Example Method on a Main Class
public static void main(String... args) {
try {
System.out.println(formatPhoneNumber("8091231234"));
} catch (Exception e) {
e.printStackTrace();
}
try {
System.out.println(formatPhoneNumber("18091231234"));
} catch (Exception e) {
e.printStackTrace();
}
try {
System.out.println(formatPhoneNumber("451231234"));
} catch (Exception e) {
e.printStackTrace();
}
try {
System.out.println(formatPhoneNumber("11231234"));
} catch (Exception e) {
e.printStackTrace();
}
try {
System.out.println(formatPhoneNumber("1231234"));
} catch (Exception e) {
e.printStackTrace();
}
try {
System.out.println(formatPhoneNumber("231234"));
} catch (Exception e) {
e.printStackTrace();
}
try {
System.out.println(formatPhoneNumber(""));
} catch (Exception e) {
e.printStackTrace();
}
try {
System.out.println(formatPhoneNumber(0));
} catch (Exception e) {
e.printStackTrace();
}
try {
System.out.println(formatPhoneNumber(8091231234f));
} catch (Exception e) {
e.printStackTrace();
}
}
// Magic
public static String formatPhoneNumber(Object phone) throws Exception {
double p = 0;
if (phone instanceof String)
p = Double.valueOf((String) phone);
if (phone instanceof Integer)
p = (Integer) phone;
if (phone instanceof Float)
p = (Float) phone;
if (phone instanceof Double)
p = (Double) phone;
if (p == 0 || String.valueOf(p) == "" || String.valueOf(p).length() < 7)
throw new Exception("Paramenter is no valid");
String fot = phoneFormatD.format(p);
String extra = fot.length() > 10 ? fot.substring(0, fot.length() - 10) : "";
fot = fot.length() > 10 ? fot.substring(fot.length() - 10, fot.length()) : fot;
String[] arr = {
(fot.charAt(0) != '0') ? fot.substring(0, 3) : (fot.charAt(1) != '0') ? fot.substring(1, 3) : fot.substring(2, 3),
fot.substring(3, 6),
fot.substring(6)
};
String r = phoneFormatM.format(arr);
r = (r.contains("(0)")) ? r.replace("(0) ", "") : r;
r = (extra != "") ? ("+" + extra + " " + r) : r;
return (r);
}
}
Result will be
(809) 123-1234
+1 (809) 123-1234
(45) 123-1234
(1) 123-1234
123-1234
023-1234
java.lang.NumberFormatException: empty String
at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1842)
at sun.misc.FloatingDecimal.parseDouble(FloatingDecimal.java:110)
at java.lang.Double.parseDouble(Double.java:538)
at java.lang.Double.valueOf(Double.java:502)
at test.formatPhoneNumber(test.java:66)
at test.main(test.java:45)
java.lang.Exception: Paramenter is no valid
at test.formatPhoneNumber(test.java:78)
at test.main(test.java:50)
(809) 123-1232
Personally I prefer static functions over nameless namespaces for the following reasons:
It's obvious and clear from function definition alone that it's private to the translation unit where it's compiled. With nameless namespace you might need to scroll and search to see if a function is in a namespace.
Functions in namespaces might be treated as extern by some (older) compilers. In VS2017 they are still extern. For this reason even if a function is in nameless namespace you might still want to mark them static.
Static functions behave very similar in C or C++, while nameless namespaces are obviously C++ only. nameless namespaces also add extra level in indentation and I don't like that :)
So, I'm happy to see that use of static for functions isn't deprecated anymore.
The 2 domains mydomain.com
and subdomain.mydomain.com
can only share cookies if the domain is explicitly named in the Set-Cookie
header. Otherwise, the scope of the cookie is restricted to the request host. (This is referred to as a "host-only cookie". See What is a host only cookie?)
For instance, if you sent the following header from subdomain.mydomain.com
, then the cookie won't be sent for requests to mydomain.com
:
Set-Cookie: name=value
However if you use the following, it will be usable on both domains:
Set-Cookie: name=value; domain=mydomain.com
This cookie will be sent for any subdomain of mydomain.com, including nested subdomains like subsub.subdomain.mydomain.com
.
In RFC 2109, a domain without a leading dot meant that it could not be used on subdomains, and only a leading dot (.mydomain.com
) would allow it to be used across multiple subdomains (but not the top-level domain, so what you ask was not possible in the older spec).
However, all modern browsers respect the newer specification RFC 6265, and will ignore any leading dot, meaning you can use the cookie on subdomains as well as the top-level domain.
In summary, if you set a cookie like the second example above from mydomain.com
, it would be accessible by subdomain.mydomain.com
, and vice versa. This can also be used to allow sub1.mydomain.com
and sub2.mydomain.com
to share cookies.
See also:
Google Maps API v3:
I initialized Google Map and added markers to it. Later, I wanted to retrieve all markers and did it simply by accessing the map property "markers".
var map = new GMaps({
div: '#map',
lat: 40.730610,
lng: -73.935242,
});
var myMarkers = map.markers;
You can loop over it and access all Marker methods listed at Google Maps Reference.
The way I have sorted HTML tables in the browser uses plain, unadorned Javascript.
The basic process is:
The table should, of course, be nice HTML. Something like this...
<table>
<thead>
<tr><th>Name</th><th>Age</th></tr>
</thead>
<tbody>
<tr><td>Sioned</td><td>62</td></tr>
<tr><td>Dylan</td><td>37</td></tr>
...etc...
</tbody>
</table>
So, first adding the click handlers...
const table = document.querySelector('table'); //get the table to be sorted
table.querySelectorAll('th') // get all the table header elements
.forEach((element, columnNo)=>{ // add a click handler for each
element.addEventListener('click', event => {
sortTable(table, columnNo); //call a function which sorts the table by a given column number
})
})
This won't work right now because the sortTable
function which is called in the event handler doesn't exist.
Lets write it...
function sortTable(table, sortColumn){
// get the data from the table cells
const tableBody = table.querySelector('tbody')
const tableData = table2data(tableBody);
// sort the extracted data
tableData.sort((a, b)=>{
if(a[sortColumn] > b[sortColumn]){
return 1;
}
return -1;
})
// put the sorted data back into the table
data2table(tableBody, tableData);
}
So now we get to the meat of the problem, we need to make the functions table2data
to get data out of the table, and data2table
to put it back in once sorted.
Here they are ...
// this function gets data from the rows and cells
// within an html tbody element
function table2data(tableBody){
const tableData = []; // create the array that'll hold the data rows
tableBody.querySelectorAll('tr')
.forEach(row=>{ // for each table row...
const rowData = []; // make an array for that row
row.querySelectorAll('td') // for each cell in that row
.forEach(cell=>{
rowData.push(cell.innerText); // add it to the row data
})
tableData.push(rowData); // add the full row to the table data
});
return tableData;
}
// this function puts data into an html tbody element
function data2table(tableBody, tableData){
tableBody.querySelectorAll('tr') // for each table row...
.forEach((row, i)=>{
const rowData = tableData[i]; // get the array for the row data
row.querySelectorAll('td') // for each table cell ...
.forEach((cell, j)=>{
cell.innerText = rowData[j]; // put the appropriate array element into the cell
})
tableData.push(rowData);
});
}
And that should do it.
A couple of things that you may wish to add (or reasons why you may wish to use an off the shelf solution): An option to change the direction and type of sort i.e. you may wish to sort some columns numerically ("10" > "2"
is false because they're strings, probably not what you want). The ability to mark a column as sorted. Some kind of data validation.
In my case, I didn't have to put the text in the middle of a canvas, but in a wheel that spins. Though I had to use this code to succeed:
fun getTextRect(textSize: Float, textPaint: TextPaint, string: String) : PointF {
val rect = RectF(left, top, right, bottom)
val rectHeight = Rect()
val cx = rect.centerX()
val cy = rect.centerY()
textPaint.getTextBounds(string, 0, string.length, rectHeight)
val y = cy + rectHeight.height()/2
val x = cx - textPaint.measureText(string)/2
return PointF(x, y)
}
Then I call this method from the View class:
private fun drawText(canvas: Canvas, paint: TextPaint, text: String, string: String) {
val pointF = getTextRect(paint.textSize, textPaint, string)
canvas.drawText(text, pointF!!.x, pointF.y, paint)
}
OK... I spent hours trying to figure why userManager.updateAsync
would not persist the user data that we edit ... until I reached the following conclusion:
The confusion arises from the fact that we create the UserManager
in one line like this:
var manager = new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(new MyDbContext()));
...then we use manager.UpdateAsync( user );
but that will update the user in the context, and then we will need to save changes to the dbcontext of the Identity. So, the question is how to get the Identity DBcontext in the easiest way.
To solve this, we should not create the UserManager
in one line ... and here is how I do it:
var store = new UserStore<ApplicationUser>(new MyDbContext());
var manager = new UserManager(store);
then after updating the user by calling
manager.UpdateAsync(user);
then you go to the context
var ctx = store.context;
then
ctx.saveChanges();
wahooooooo...persisted :)
Hope this will help someone who pulled their hair for a few hours :P
So basically, in jquery what we can do is to load href attribute using the load function. This way we can use the url in <a>
tag and load that in modal-body.
<a href='/site/login' class='ls-modal'>Login</a>
//JS script
$('.ls-modal').on('click', function(e){
e.preventDefault();
$('#myModal').modal('show').find('.modal-body').load($(this).attr('href'));
});
Does the class org.apache.maven.shared.filtering.MavenFilteringException
exist in file:/C:/Users/utopcu/.m2/repository/org/apache/maven/shared/maven-filtering/1.0-beta-2/maven-filtering-1.0-beta-2.jar
?
The error message suggests that it doesn't. Maybe the JAR was corrupted somehow.
I'm also wondering where the version 1.0-beta-2
comes from; I have 1.0
on my disk. Try version 2.3
of the WAR plugin.
I found an example from @progress/kendo-data-query
in file filter-descriptor.interface.d.ts
Checker
declare const isCompositeFilterDescriptor: (source: FilterDescriptor | CompositeFilterDescriptor) => source is CompositeFilterDescriptor;
Example usage
const filters: Array<FilterDescriptor | CompositeFilterDescriptor> = filter.filters;
filters.forEach((element: FilterDescriptor | CompositeFilterDescriptor) => {
if (isCompositeFilterDescriptor(element)) {
// element type is CompositeFilterDescriptor
} else {
// element type is FilterDescriptor
}
});
If you are using C#, you do not need to escape it.
You could put an index on MemberType.
If you actually want the answer back as a string as opposed to a byte array, you could always do something like this:
String plaintext = "your text here";
MessageDigest m = MessageDigest.getInstance("MD5");
m.reset();
m.update(plaintext.getBytes());
byte[] digest = m.digest();
BigInteger bigInt = new BigInteger(1,digest);
String hashtext = bigInt.toString(16);
// Now we need to zero pad it if you actually want the full 32 chars.
while(hashtext.length() < 32 ){
hashtext = "0"+hashtext;
}
You have to call close()
on the GZIPOutputStream
before you attempt to read it. The final bytes of the file will only be written when the file is actually closed. (This is irrespective of any explicit buffering in the output stack. The stream only knows to compress and write the last bytes when you tell it to close. A flush()
probably won't help ... though calling finish()
instead of close()
should work. Look at the javadocs.)
Here's the correct code (in Java);
package test;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
public class GZipTest {
public static void main(String[] args) throws
FileNotFoundException, IOException {
String name = "/tmp/test";
GZIPOutputStream gz = new GZIPOutputStream(new FileOutputStream(name));
gz.write(10);
gz.close(); // Remove this to reproduce the reported bug
System.out.println(new GZIPInputStream(new FileInputStream(name)).read());
}
}
(I've not implemented resource management or exception handling / reporting properly as they are not relevant to the purpose of this code. Don't treat this as an example of "good code".)
See Tejas Lagvankar's post about this subject. Below are some key differences between Service and IntentService and other components.
If you need just to execute your VLC playback process and only give control back to your application process when it is done and nothing more complex, then i suppose you can use just:
system("The same thing you type into console");
Perhaps (gnu) time(1) already does what you want. For instance:
$ /usr/bin/time -f "%P %M" command
43% 821248
But other profiling tools may give more accurate results depending on what you are looking for.
Does an implicit conversion occur between Task<> and int?
Nope. This is just part of how async
/await
works.
Any method declared as async
has to have a return type of:
void
(avoid if possible)Task
(no result beyond notification of completion/failure)Task<T>
(for a logical result of type T
in an async manner)The compiler does all the appropriate wrapping. The point is that you're asynchronously returning urlContents.Length
- you can't make the method just return int
, as the actual method will return when it hits the first await
expression which hasn't already completed. So instead, it returns a Task<int>
which will complete when the async method itself completes.
Note that await
does the opposite - it unwraps a Task<T>
to a T
value, which is how this line works:
string urlContents = await getStringTask;
... but of course it unwraps it asynchronously, whereas just using Result
would block until the task had completed. (await
can unwrap other types which implement the awaitable pattern, but Task<T>
is the one you're likely to use most often.)
This dual wrapping/unwrapping is what allows async to be so composable. For example, I could write another async method which calls yours and doubles the result:
public async Task<int> AccessTheWebAndDoubleAsync()
{
var task = AccessTheWebAsync();
int result = await task;
return result * 2;
}
(Or simply return await AccessTheWebAsync() * 2;
of course.)
How to get away with it.. [Swift]
var clusterArray = [String]()
var pinOffSet : Double = 0
var pinLat = yourLat
var pinLong = yourLong
var location = pinLat + pinLong
A new marker is about to be created? check clusterArray
and manipulate it's offset
if(!clusterArray.contains(location)){
clusterArray.append(location)
} else {
pinOffSet += 1
let offWithIt = 0.00025 // reasonable offset with zoomLvl(14-16)
switch pinOffSet {
case 1 : pinLong = pinLong + offWithIt ; pinLat = pinLat + offWithIt
case 2 : pinLong = pinLong + offWithIt ; pinLat = pinLat - offWithIt
case 3 : pinLong = pinLong - offWithIt ; pinLat = pinLat - offWithIt
case 4 : pinLong = pinLong - offWithIt ; pinLat = pinLat + offWithIt
default : print(1)
}
}
result
Although many year ago, clsocket seems a really nice small cross-platform (Windows, Linux, Mac OSX): https://github.com/DFHack/clsocket
Using aggregate
:
aggregate(x$Frequency, by=list(Category=x$Category), FUN=sum)
Category x
1 First 30
2 Second 5
3 Third 34
In the example above, multiple dimensions can be specified in the list
. Multiple aggregated metrics of the same data type can be incorporated via cbind
:
aggregate(cbind(x$Frequency, x$Metric2, x$Metric3) ...
(embedding @thelatemail comment), aggregate
has a formula interface too
aggregate(Frequency ~ Category, x, sum)
Or if you want to aggregate multiple columns, you could use the .
notation (works for one column too)
aggregate(. ~ Category, x, sum)
or tapply
:
tapply(x$Frequency, x$Category, FUN=sum)
First Second Third
30 5 34
Using this data:
x <- data.frame(Category=factor(c("First", "First", "First", "Second",
"Third", "Third", "Second")),
Frequency=c(10,15,5,2,14,20,3))
Easiest solution
<button type="button" onclick="window.location.href='{{ url_for( 'move_forward') }}';">Forward</button>
I post the below solution here because after some searching this is where I landed, so other may too. I was trying to use EF 6 to call a stored procedure, but had a similar error because the stored procedure had a linked server being utilized.
The operation could not be performed because OLE DB provider _ for linked server _ was unable to begin a distributed transaction
The partner transaction manager has disabled its support for remote/network transactions*
Jumping over to SQL Client did fix my issue, which also confirmed for me that it was an EF thing.
EF model generated method based attempt:
db.SomeStoredProcedure();
ExecuteSqlCommand based attempt:
db.Database.ExecuteSqlCommand("exec [SomeDB].[dbo].[SomeStoredProcedure]");
With:
var connectionString = db.Database.Connection.ConnectionString;
var connection = new System.Data.SqlClient.SqlConnection(connectionString);
var cmd = connection.CreateCommand();
cmd.CommandText = "exec [SomeDB].[dbo].[SomeStoredProcedure]";
connection.Open();
var result = cmd.ExecuteNonQuery();
That code can be shortened, but I think that version is slightly more convenient for debugging and stepping through.
I don't believe that Sql Client is necessarily a preferred choice, but I felt this was at least worth sharing if anyone else having similar problems gets landed here by google.
The above Code is C#, but the concept of trying to switch over to Sql Client still applies. At the very least it will be diagnostic to attempt to do so.
For such a simple XML structure, you may not want to involve a full blown XML module. Consider a string template for the simplest structures, or Jinja for something a little more complex. Jinja can handle looping over a list of data to produce the inner xml of your document list. That is a bit trickier with raw python string templates
For a Jinja example, see my answer to a similar question.
Here is an example of generating your xml with string templates.
import string
from xml.sax.saxutils import escape
inner_template = string.Template(' <field${id} name="${name}">${value}</field${id}>')
outer_template = string.Template("""<root>
<doc>
${document_list}
</doc>
</root>
""")
data = [
(1, 'foo', 'The value for the foo document'),
(2, 'bar', 'The <value> for the <bar> document'),
]
inner_contents = [inner_template.substitute(id=id, name=name, value=escape(value)) for (id, name, value) in data]
result = outer_template.substitute(document_list='\n'.join(inner_contents))
print result
Output:
<root>
<doc>
<field1 name="foo">The value for the foo document</field1>
<field2 name="bar">The <value> for the <bar> document</field2>
</doc>
</root>
The downer of the template approach is that you won't get escaping of <
and >
for free. I danced around that problem by pulling in a util from xml.sax
I believe that using a combination of interfaces and base classes could work for you. It will enforce behavioral requirements at compile time (rq_ post "below" refers to a post above, which is not this one).
The interface sets the behavioral API that isn't met by the base class. You will not be able to set base class methods to call on methods defined in the interface (because you will not be able to implement that interface in the base class without having to define those behaviors). Maybe someone can come up with a safe trick to allow calling of the interface methods in the parent.
You have to remember to extend and implement in the class you will instantiate. It satisfies concerns about defining runtime-fail code. You also won't even be able to call the methods that would puke if you haven't implemented the interface (such as if you try to instantiate the Animal class). I tried having the interface extend the BaseAnimal below, but it hid the constructor and the 'name' field of BaseAnimal from Snake. If I had been able to do that, the use of a module and exports could have prevented accidental direct instantiation of the BaseAnimal class.
Paste this in here to see if it works for you: http://www.typescriptlang.org/Playground/
// The behavioral interface also needs to extend base for substitutability
interface AbstractAnimal extends BaseAnimal {
// encapsulates animal behaviors that must be implemented
makeSound(input : string): string;
}
class BaseAnimal {
constructor(public name) { }
move(meters) {
alert(this.name + " moved " + meters + "m.");
}
}
// If concrete class doesn't extend both, it cannot use super methods.
class Snake extends BaseAnimal implements AbstractAnimal {
constructor(name) { super(name); }
makeSound(input : string): string {
var utterance = "sssss"+input;
alert(utterance);
return utterance;
}
move() {
alert("Slithering...");
super.move(5);
}
}
var longMover = new Snake("windy man");
longMover.makeSound("...am I nothing?");
longMover.move();
var fulture = new BaseAnimal("bob fossil");
// compile error on makeSound() because it is not defined.
// fulture.makeSound("you know, like a...")
fulture.move(1);
I came across FristvanCampen's answer as linked below. He says abstract classes are an anti-pattern, and suggests that one instantiate base 'abstract' classes using an injected instance of an implementing class. This is fair, but there are counter arguments made. Read for yourself: https://typescript.codeplex.com/discussions/449920
Part 2: I had another case where I wanted an abstract class, but I was prevented from using my solution above, because the defined methods in the "abstract class" needed to refer to the methods defined in the matching interface. So, I tool FristvanCampen's advice, sort of. I have the incomplete "abstract" class, with method implementations. I have the interface with the unimplemented methods; this interface extends the "abstract" class. I then have a class that extends the first and implements the second (it must extend both because the super constructor is inaccessible otherwise). See the (non-runnable) sample below:
export class OntologyConceptFilter extends FilterWidget.FilterWidget<ConceptGraph.Node, ConceptGraph.Link> implements FilterWidget.IFilterWidget<ConceptGraph.Node, ConceptGraph.Link> {
subMenuTitle = "Ontologies Rendered"; // overload or overshadow?
constructor(
public conceptGraph: ConceptGraph.ConceptGraph,
graphView: PathToRoot.ConceptPathsToRoot,
implementation: FilterWidget.IFilterWidget<ConceptGraph.Node, ConceptGraph.Link>
){
super(graphView);
this.implementation = this;
}
}
and
export class FilterWidget<N extends GraphView.BaseNode, L extends GraphView.BaseLink<GraphView.BaseNode>> {
public implementation: IFilterWidget<N, L>
filterContainer: JQuery;
public subMenuTitle : string; // Given value in children
constructor(
public graphView: GraphView.GraphView<N, L>
){
}
doStuff(node: N){
this.implementation.generateStuff(thing);
}
}
export interface IFilterWidget<N extends GraphView.BaseNode, L extends GraphView.BaseLink<GraphView.BaseNode>> extends FilterWidget<N, L> {
generateStuff(node: N): string;
}
foreach
supports iteration over three different kinds of values:
Traversable
objectsIn the following, I will try to explain precisely how iteration works in different cases. By far the simplest case is Traversable
objects, as for these foreach
is essentially only syntax sugar for code along these lines:
foreach ($it as $k => $v) { /* ... */ }
/* translates to: */
if ($it instanceof IteratorAggregate) {
$it = $it->getIterator();
}
for ($it->rewind(); $it->valid(); $it->next()) {
$v = $it->current();
$k = $it->key();
/* ... */
}
For internal classes, actual method calls are avoided by using an internal API that essentially just mirrors the Iterator
interface on the C level.
Iteration of arrays and plain objects is significantly more complicated. First of all, it should be noted that in PHP "arrays" are really ordered dictionaries and they will be traversed according to this order (which matches the insertion order as long as you didn't use something like sort
). This is opposed to iterating by the natural order of the keys (how lists in other languages often work) or having no defined order at all (how dictionaries in other languages often work).
The same also applies to objects, as the object properties can be seen as another (ordered) dictionary mapping property names to their values, plus some visibility handling. In the majority of cases, the object properties are not actually stored in this rather inefficient way. However, if you start iterating over an object, the packed representation that is normally used will be converted to a real dictionary. At that point, iteration of plain objects becomes very similar to iteration of arrays (which is why I'm not discussing plain-object iteration much in here).
So far, so good. Iterating over a dictionary can't be too hard, right? The problems begin when you realize that an array/object can change during iteration. There are multiple ways this can happen:
foreach ($arr as &$v)
then $arr
is turned into a reference and you can change it during iteration.$ref =& $arr; foreach ($ref as $v)
The problem with allowing modifications during iteration is the case where the element you are currently on is removed. Say you use a pointer to keep track of which array element you are currently at. If this element is now freed, you are left with a dangling pointer (usually resulting in a segfault).
There are different ways of solving this issue. PHP 5 and PHP 7 differ significantly in this regard and I'll describe both behaviors in the following. The summary is that PHP 5's approach was rather dumb and lead to all kinds of weird edge-case issues, while PHP 7's more involved approach results in more predictable and consistent behavior.
As a last preliminary, it should be noted that PHP uses reference counting and copy-on-write to manage memory. This means that if you "copy" a value, you actually just reuse the old value and increment its reference count (refcount). Only once you perform some kind of modification a real copy (called a "duplication") will be done. See You're being lied to for a more extensive introduction on this topic.
Arrays in PHP 5 have one dedicated "internal array pointer" (IAP), which properly supports modifications: Whenever an element is removed, there will be a check whether the IAP points to this element. If it does, it is advanced to the next element instead.
While foreach
does make use of the IAP, there is an additional complication: There is only one IAP, but one array can be part of multiple foreach
loops:
// Using by-ref iteration here to make sure that it's really
// the same array in both loops and not a copy
foreach ($arr as &$v1) {
foreach ($arr as &$v) {
// ...
}
}
To support two simultaneous loops with only one internal array pointer, foreach
performs the following shenanigans: Before the loop body is executed, foreach
will back up a pointer to the current element and its hash into a per-foreach HashPointer
. After the loop body runs, the IAP will be set back to this element if it still exists. If however the element has been removed, we'll just use wherever the IAP is currently at. This scheme mostly-kinda-sort of works, but there's a lot of weird behavior you can get out of it, some of which I'll demonstrate below.
The IAP is a visible feature of an array (exposed through the current
family of functions), as such changes to the IAP count as modifications under copy-on-write semantics. This, unfortunately, means that foreach
is in many cases forced to duplicate the array it is iterating over. The precise conditions are:
refcount
is 1, then the array is not shared and we're free to modify it directly.If the array is not duplicated (is_ref=0, refcount=1), then only its refcount
will be incremented (*). Additionally, if foreach
by reference is used, then the (potentially duplicated) array will be turned into a reference.
Consider this code as an example where duplication occurs:
function iterate($arr) {
foreach ($arr as $v) {}
}
$outerArr = [0, 1, 2, 3, 4];
iterate($outerArr);
Here, $arr
will be duplicated to prevent IAP changes on $arr
from leaking to $outerArr
. In terms of the conditions above, the array is not a reference (is_ref=0) and is used in two places (refcount=2). This requirement is unfortunate and an artifact of the suboptimal implementation (there is no concern of modification during iteration here, so we don't really need to use the IAP in the first place).
(*) Incrementing the refcount
here sounds innocuous, but violates copy-on-write (COW) semantics: This means that we are going to modify the IAP of a refcount=2 array, while COW dictates that modifications can only be performed on refcount=1 values. This violation results in user-visible behavior change (while a COW is normally transparent) because the IAP change on the iterated array will be observable -- but only until the first non-IAP modification on the array. Instead, the three "valid" options would have been a) to always duplicate, b) do not increment the refcount
and thus allowing the iterated array to be arbitrarily modified in the loop or c) don't use the IAP at all (the PHP 7 solution).
There is one last implementation detail that you have to be aware of to properly understand the code samples below. The "normal" way of looping through some data structure would look something like this in pseudocode:
reset(arr);
while (get_current_data(arr, &data) == SUCCESS) {
code();
move_forward(arr);
}
However foreach
, being a rather special snowflake, chooses to do things slightly differently:
reset(arr);
while (get_current_data(arr, &data) == SUCCESS) {
move_forward(arr);
code();
}
Namely, the array pointer is already moved forward before the loop body runs. This means that while the loop body is working on element $i
, the IAP is already at element $i+1
. This is the reason why code samples showing modification during iteration will always unset
the next element, rather than the current one.
The three aspects described above should provide you with a mostly complete impression of the idiosyncrasies of the foreach
implementation and we can move on to discuss some examples.
The behavior of your test cases is simple to explain at this point:
In test cases 1 and 2 $array
starts off with refcount=1, so it will not be duplicated by foreach
: Only the refcount
is incremented. When the loop body subsequently modifies the array (which has refcount=2 at that point), the duplication will occur at that point. Foreach will continue working on an unmodified copy of $array
.
In test case 3, once again the array is not duplicated, thus foreach
will be modifying the IAP of the $array
variable. At the end of the iteration, the IAP is NULL (meaning iteration has done), which each
indicates by returning false
.
In test cases 4 and 5 both each
and reset
are by-reference functions. The $array
has a refcount=2
when it is passed to them, so it has to be duplicated. As such foreach
will be working on a separate array again.
current
in foreachA good way to show the various duplication behaviors is to observe the behavior of the current()
function inside a foreach
loop. Consider this example:
foreach ($array as $val) {
var_dump(current($array));
}
/* Output: 2 2 2 2 2 */
Here you should know that current()
is a by-ref function (actually: prefer-ref), even though it does not modify the array. It has to be in order to play nice with all the other functions like next
which are all by-ref. By-reference passing implies that the array has to be separated and thus $array
and the foreach-array
will be different. The reason you get 2
instead of 1
is also mentioned above: foreach
advances the array pointer before running the user code, not after. So even though the code is at the first element, foreach
already advanced the pointer to the second.
Now lets try a small modification:
$ref = &$array;
foreach ($array as $val) {
var_dump(current($array));
}
/* Output: 2 3 4 5 false */
Here we have the is_ref=1 case, so the array is not copied (just like above). But now that it is a reference, the array no longer has to be duplicated when passing to the by-ref current()
function. Thus current()
and foreach
work on the same array. You still see the off-by-one behavior though, due to the way foreach
advances the pointer.
You get the same behavior when doing by-ref iteration:
foreach ($array as &$val) {
var_dump(current($array));
}
/* Output: 2 3 4 5 false */
Here the important part is that foreach will make $array
an is_ref=1 when it is iterated by reference, so basically you have the same situation as above.
Another small variation, this time we'll assign the array to another variable:
$foo = $array;
foreach ($array as $val) {
var_dump(current($array));
}
/* Output: 1 1 1 1 1 */
Here the refcount of the $array
is 2 when the loop is started, so for once we actually have to do the duplication upfront. Thus $array
and the array used by foreach will be completely separate from the outset. That's why you get the position of the IAP wherever it was before the loop (in this case it was at the first position).
Trying to account for modifications during iteration is where all our foreach troubles originated, so it serves to consider some examples for this case.
Consider these nested loops over the same array (where by-ref iteration is used to make sure it really is the same one):
foreach ($array as &$v1) {
foreach ($array as &$v2) {
if ($v1 == 1 && $v2 == 1) {
unset($array[1]);
}
echo "($v1, $v2)\n";
}
}
// Output: (1, 1) (1, 3) (1, 4) (1, 5)
The expected part here is that (1, 2)
is missing from the output because element 1
was removed. What's probably unexpected is that the outer loop stops after the first element. Why is that?
The reason behind this is the nested-loop hack described above: Before the loop body runs, the current IAP position and hash is backed up into a HashPointer
. After the loop body it will be restored, but only if the element still exists, otherwise the current IAP position (whatever it may be) is used instead. In the example above this is exactly the case: The current element of the outer loop has been removed, so it will use the IAP, which has already been marked as finished by the inner loop!
Another consequence of the HashPointer
backup+restore mechanism is that changes to the IAP through reset()
etc. usually do not impact foreach
. For example, the following code executes as if the reset()
were not present at all:
$array = [1, 2, 3, 4, 5];
foreach ($array as &$value) {
var_dump($value);
reset($array);
}
// output: 1, 2, 3, 4, 5
The reason is that, while reset()
temporarily modifies the IAP, it will be restored to the current foreach element after the loop body. To force reset()
to make an effect on the loop, you have to additionally remove the current element, so that the backup/restore mechanism fails:
$array = [1, 2, 3, 4, 5];
$ref =& $array;
foreach ($array as $value) {
var_dump($value);
unset($array[1]);
reset($array);
}
// output: 1, 1, 3, 4, 5
But, those examples are still sane. The real fun starts if you remember that the HashPointer
restore uses a pointer to the element and its hash to determine whether it still exists. But: Hashes have collisions, and pointers can be reused! This means that, with a careful choice of array keys, we can make foreach
believe that an element that has been removed still exists, so it will jump directly to it. An example:
$array = ['EzEz' => 1, 'EzFY' => 2, 'FYEz' => 3];
$ref =& $array;
foreach ($array as $value) {
unset($array['EzFY']);
$array['FYFY'] = 4;
reset($array);
var_dump($value);
}
// output: 1, 4
Here we should normally expect the output 1, 1, 3, 4
according to the previous rules. How what happens is that 'FYFY'
has the same hash as the removed element 'EzFY'
, and the allocator happens to reuse the same memory location to store the element. So foreach ends up directly jumping to the newly inserted element, thus short-cutting the loop.
One last odd case that I'd like to mention, it is that PHP allows you to substitute the iterated entity during the loop. So you can start iterating on one array and then replace it with another array halfway through. Or start iterating on an array and then replace it with an object:
$arr = [1, 2, 3, 4, 5];
$obj = (object) [6, 7, 8, 9, 10];
$ref =& $arr;
foreach ($ref as $val) {
echo "$val\n";
if ($val == 3) {
$ref = $obj;
}
}
/* Output: 1 2 3 6 7 8 9 10 */
As you can see in this case PHP will just start iterating the other entity from the start once the substitution has happened.
If you still remember, the main problem with array iteration was how to handle removal of elements mid-iteration. PHP 5 used a single internal array pointer (IAP) for this purpose, which was somewhat suboptimal, as one array pointer had to be stretched to support multiple simultaneous foreach loops and interaction with reset()
etc. on top of that.
PHP 7 uses a different approach, namely, it supports creating an arbitrary amount of external, safe hashtable iterators. These iterators have to be registered in the array, from which point on they have the same semantics as the IAP: If an array element is removed, all hashtable iterators pointing to that element will be advanced to the next element.
This means that foreach
will no longer use the IAP at all. The foreach
loop will be absolutely no effect on the results of current()
etc. and its own behavior will never be influenced by functions like reset()
etc.
Another important change between PHP 5 and PHP 7 relates to array duplication. Now that the IAP is no longer used, by-value array iteration will only do a refcount
increment (instead of duplication the array) in all cases. If the array is modified during the foreach
loop, at that point a duplication will occur (according to copy-on-write) and foreach
will keep working on the old array.
In most cases, this change is transparent and has no other effect than better performance. However, there is one occasion where it results in different behavior, namely the case where the array was a reference beforehand:
$array = [1, 2, 3, 4, 5];
$ref = &$array;
foreach ($array as $val) {
var_dump($val);
$array[2] = 0;
}
/* Old output: 1, 2, 0, 4, 5 */
/* New output: 1, 2, 3, 4, 5 */
Previously by-value iteration of reference-arrays was special cases. In this case, no duplication occurred, so all modifications of the array during iteration would be reflected by the loop. In PHP 7 this special case is gone: A by-value iteration of an array will always keep working on the original elements, disregarding any modifications during the loop.
This, of course, does not apply to by-reference iteration. If you iterate by-reference all modifications will be reflected by the loop. Interestingly, the same is true for by-value iteration of plain objects:
$obj = new stdClass;
$obj->foo = 1;
$obj->bar = 2;
foreach ($obj as $val) {
var_dump($val);
$obj->bar = 42;
}
/* Old and new output: 1, 42 */
This reflects the by-handle semantics of objects (i.e. they behave reference-like even in by-value contexts).
Let's consider a few examples, starting with your test cases:
Test cases 1 and 2 retain the same output: By-value array iteration always keep working on the original elements. (In this case, even refcounting
and duplication behavior is exactly the same between PHP 5 and PHP 7).
Test case 3 changes: Foreach
no longer uses the IAP, so each()
is not affected by the loop. It will have the same output before and after.
Test cases 4 and 5 stay the same: each()
and reset()
will duplicate the array before changing the IAP, while foreach
still uses the original array. (Not that the IAP change would have mattered, even if the array was shared.)
The second set of examples was related to the behavior of current()
under different reference/refcounting
configurations. This no longer makes sense, as current()
is completely unaffected by the loop, so its return value always stays the same.
However, we get some interesting changes when considering modifications during iteration. I hope you will find the new behavior saner. The first example:
$array = [1, 2, 3, 4, 5];
foreach ($array as &$v1) {
foreach ($array as &$v2) {
if ($v1 == 1 && $v2 == 1) {
unset($array[1]);
}
echo "($v1, $v2)\n";
}
}
// Old output: (1, 1) (1, 3) (1, 4) (1, 5)
// New output: (1, 1) (1, 3) (1, 4) (1, 5)
// (3, 1) (3, 3) (3, 4) (3, 5)
// (4, 1) (4, 3) (4, 4) (4, 5)
// (5, 1) (5, 3) (5, 4) (5, 5)
As you can see, the outer loop no longer aborts after the first iteration. The reason is that both loops now have entirely separate hashtable iterators, and there is no longer any cross-contamination of both loops through a shared IAP.
Another weird edge case that is fixed now, is the odd effect you get when you remove and add elements that happen to have the same hash:
$array = ['EzEz' => 1, 'EzFY' => 2, 'FYEz' => 3];
foreach ($array as &$value) {
unset($array['EzFY']);
$array['FYFY'] = 4;
var_dump($value);
}
// Old output: 1, 4
// New output: 1, 3, 4
Previously the HashPointer restore mechanism jumped right to the new element because it "looked" like it's the same as the removed element (due to colliding hash and pointer). As we no longer rely on the element hash for anything, this is no longer an issue.
if (!myString.replace(/^\s+|\s+$/g,""))
alert('string is only whitespace');
From the docs:
The comparison uses lexicographical ordering: first the first two items are compared, and if they differ this determines the outcome of the comparison; if they are equal, the next two items are compared, and so on, until either sequence is exhausted.
Also:
Lexicographical ordering for strings uses the Unicode code point number to order individual characters.
or on Python 2:
Lexicographical ordering for strings uses the ASCII ordering for individual characters.
As an example:
>>> 'abc' > 'bac'
False
>>> ord('a'), ord('b')
(97, 98)
The result False
is returned as soon as a
is found to be less than b
. The further items are not compared (as you can see for the second items: b
> a
is True
).
Be aware of lower and uppercase:
>>> [(x, ord(x)) for x in abc]
[('a', 97), ('b', 98), ('c', 99), ('d', 100), ('e', 101), ('f', 102), ('g', 103), ('h', 104), ('i', 105), ('j', 106), ('k', 107), ('l', 108), ('m', 109), ('n', 110), ('o', 111), ('p', 112), ('q', 113), ('r', 114), ('s', 115), ('t', 116), ('u', 117), ('v', 118), ('w', 119), ('x', 120), ('y', 121), ('z', 122)]
>>> [(x, ord(x)) for x in abc.upper()]
[('A', 65), ('B', 66), ('C', 67), ('D', 68), ('E', 69), ('F', 70), ('G', 71), ('H', 72), ('I', 73), ('J', 74), ('K', 75), ('L', 76), ('M', 77), ('N', 78), ('O', 79), ('P', 80), ('Q', 81), ('R', 82), ('S', 83), ('T', 84), ('U', 85), ('V', 86), ('W', 87), ('X', 88), ('Y', 89), ('Z', 90)]
Using ES6 modules you can do the following:
import {version} from './package.json';
Use lxml.builder class, from: http://lxml.de/tutorial.html#the-e-factory
import lxml.builder as lb
from lxml import etree
nstext = "new story"
story = lb.E.Asset(
lb.E.Attribute(nstext, name="Name", act="set"),
lb.E.Relation(lb.E.Asset(idref="Scope:767"),
name="Scope", act="set")
)
print 'story:\n', etree.tostring(story, pretty_print=True)
Output:
story:
<Asset>
<Attribute name="Name" act="set">new story</Attribute>
<Relation name="Scope" act="set">
<Asset idref="Scope:767"/>
</Relation>
</Asset>
In case you are using the annotation method for filter definition (as opposed to defining them in the web.xml
), you can do so by just putting an array of mappings in the @WebFilter
annotation:
/**
* Filter implementation class LoginFilter
*/
@WebFilter(urlPatterns = { "/faces/Html/Employee","/faces/Html/Admin", "/faces/Html/Supervisor"})
public class LoginFilter implements Filter {
...
And just as an FYI, this same thing works for servlets using the servlet annotation too:
/**
* Servlet implementation class LoginServlet
*/
@WebServlet({"/faces/Html/Employee", "/faces/Html/Admin", "/faces/Html/Supervisor"})
public class LoginServlet extends HttpServlet {
...
It is work for me without any errors:
this.dataGridView2.MouseDown += new System.Windows.Forms.MouseEventHandler(this.MyDataGridView_MouseDown);
this.dataGridView2.Click += new System.EventHandler(this.DeleteRow_Click);
And this
private void MyDataGridView_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Right)
{
var hti = dataGridView2.HitTest(e.X, e.Y);
dataGridView2.ClearSelection();
dataGridView2.Rows[hti.RowIndex].Selected = true;
}
}
private void DeleteRow_Click(object sender, EventArgs e)
{
Int32 rowToDelete = dataGridView2.Rows.GetFirstRow(DataGridViewElementStates.Selected);
if (rowToDelete == -1) { }
else
{
dataGridView2.Rows.RemoveAt(rowToDelete);
dataGridView2.ClearSelection();
}
}
I know the OP specifically mentioned jQuery but I wanted to put an answer here to introduce people to the helpful Underscore library if they are not aware of it already.
By leveraging the keys
method in the Underscore library, you can simply do the following:
_.keys(foo) #=> ["alfa", "beta"]
Plus, there's a plethora of other useful functions that are worth perusing.
The differences between Model()
and Model.objects.create()
are the following:
INSERT vs UPDATE
Model.save()
does either INSERT or UPDATE of an object in a DB, while Model.objects.create()
does only INSERT.
Model.save()
does
UPDATE If the object’s primary key attribute is set to a value that evaluates to True
INSERT If the object’s primary key attribute is not set or if the UPDATE didn’t update anything (e.g. if primary key is set to a value that doesn’t exist in the database).
Existing primary key
If primary key attribute is set to a value and such primary key already exists, then Model.save()
performs UPDATE, but Model.objects.create()
raises IntegrityError
.
Consider the following models.py:
class Subject(models.Model):
subject_id = models.PositiveIntegerField(primary_key=True, db_column='subject_id')
name = models.CharField(max_length=255)
max_marks = models.PositiveIntegerField()
Insert/Update to db with Model.save()
physics = Subject(subject_id=1, name='Physics', max_marks=100)
physics.save()
math = Subject(subject_id=1, name='Math', max_marks=50) # Case of update
math.save()
Result:
Subject.objects.all().values()
<QuerySet [{'subject_id': 1, 'name': 'Math', 'max_marks': 50}]>
Insert to db with Model.objects.create()
Subject.objects.create(subject_id=1, name='Chemistry', max_marks=100)
IntegrityError: UNIQUE constraint failed: m****t.subject_id
Explanation: In the example, math.save()
does an UPDATE (changes name
from Physics to Math, and max_marks
from 100 to 50), because subject_id
is a primary key and subject_id=1
already exists in the DB. But Subject.objects.create()
raises IntegrityError
, because, again the primary key subject_id
with the value 1
already exists.
Forced insert
Model.save()
can be made to behave as Model.objects.create()
by using force_insert=True
parameter: Model.save(force_insert=True)
.
Return value
Model.save()
return None
where Model.objects.create()
return model instance i.e. package_name.models.Model
Conclusion: Model.objects.create()
does model initialization and performs save()
with force_insert=True
.
Excerpt from the source code of Model.objects.create()
def create(self, **kwargs):
"""
Create a new object with the given kwargs, saving it to the database
and returning the created object.
"""
obj = self.model(**kwargs)
self._for_write = True
obj.save(force_insert=True, using=self.db)
return obj
For more details follow the links:
In my "Ubuntu 16.04", I use next steps to completely remove and clean Kubernetes (installed with "apt-get"):
kubeadm reset
sudo apt-get purge kubeadm kubectl kubelet kubernetes-cni kube*
sudo apt-get autoremove
sudo rm -rf ~/.kube
And restart the computer.
I would try to avoid changing the xticklabels
if possible, otherwise it can get very confusing if you for example overplot your histogram with additional data.
Defining the range of your grid is probably the best and with imshow
it can be done by adding the extent
keyword. This way the axes gets adjusted automatically. If you want to change the labels i would use set_xticks
with perhaps some formatter. Altering the labels directly should be the last resort.
fig, ax = plt.subplots(figsize=(6,6))
ax.imshow(hist, cmap=plt.cm.Reds, interpolation='none', extent=[80,120,32,0])
ax.set_aspect(2) # you may also use am.imshow(..., aspect="auto") to restore the aspect ratio
For your first question try
Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
(available since API 8)
To access individual files in this directory use either File.list() or File.listFiles(). Seems that reporting download progress is only possible in notification, see here.
Take a look at Blockspring - you do need to install the plugin, but then it's just another function you call like this:
=BLOCKSPRING("twodee-array-reduce","input_array",D5:F7)
The source code and other details are here.
If this doesn't suit and/or you want to build off my solution, you can fork
my function (Python) or use another supported scripting language (Ruby
, R
, JS
, etc...).
If you want to use SimpleDateFormat
, you could write:
private final SimpleDateFormat sdf =
new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
{ sdf.setTimeZone(TimeZone.getTimeZone("GMT")); }
private long parseTimeToMillis(final String time) throws ParseException
{ return sdf.parse("1970-01-01 " + time).getTime(); }
But a custom method would be much more efficient. SimpleDateFormat
, because of all its calendar support, time-zone support, daylight-savings-time support, and so on, is pretty slow. The slowness is worth it if you actually need some of those features, but since you don't, it might not be. (It depends how often you're calling this method, and whether efficiency is a concern for your application.)
Also, SimpleDateFormat
is non-thread-safe, which is sometimes a pain. (Without knowing anything about your application, I can't guess whether that matters.)
Personally, I'd probably write a custom method.
I'm new to Gradle, using Gradle 6.0.1 JUnit 4.12. Here's what I came up with to solve this problem.
apply plugin: 'java'
repositories { jcenter() }
dependencies {
testImplementation 'junit:junit:4.12'
}
sourceSets {
main {
java {
srcDirs = ['src']
}
}
test {
java {
srcDirs = ['tests']
}
}
}
Notice that the main source and test source is referenced separately, one under main
and one under test
.
The testImplementation
item under dependencies
is only used for compiling the source in test
. If your main code actually had a dependency on JUnit, then you would also specify implementation
under dependencies
.
I had to specify the repositories
section to get this to work, I doubt that is the best/only way.
Create a Pivot Table. It has these features and many more.
If you are dead-set on doing this yourself then you could add shapes to the worksheet and use VBA to hide and unhide rows and columns on clicking the shapes.
Another solution that does not involve converting to/from strings:
from math import log10
def decompose(n):
if n == 0:
return [0]
b = int(log10(n)) + 1
return [(n // (10 ** i)) % 10 for i in reversed(range(b))]
SELECT * FROM products WHERE catid IN ('1', '2', '3', '4')
real
gets the value ent.get()
which is just a string. It has no idea where it came from, and no way to affect the widget.
Instead of real.delete()
, call .delete()
on the entry widget itself:
def res(ent, real, secret):
if secret == eval(real):
showinfo(message='that is right!')
ent.delete(0, END)
def guess():
...
btn = Button(ge, text="Enter", command=lambda: res(ent, ent.get(), secret))
If you have iOS 9.1 on your phone, just download Xcode 7.1 beta instead of using GM.
See Apple's response: Could not find developer disk image for iOS 9.1
The distinction between "self"
and "cls"
is defined in PEP 8
. As Adrien said, this is not a mandatory. It's a coding style. PEP 8
says:
Function and method arguments:
Always use
self
for the first argument to instance methods.Always use
cls
for the first argument to class methods.
Javascript won't execute within a value attribute. You could do something like this, though:
<input id="date" name="date">
<script type="text/javascript">
document.getElementById('date').value = Date();
</script>
You'd probably want to format the date as you prefer, because the default output of Date() looks something like: Tue Jun 16 2009 10:47:10 GMT-0400 (Eastern Daylight Time)
. See this SO question for info about formatting a date.
Python is not Java, nor C/C++ -- you need to stop thinking that way to really utilize the power of Python.
Python does not have pass-by-value, nor pass-by-reference, but instead uses pass-by-name (or pass-by-object) -- in other words, nearly everything is bound to a name that you can then use (the two obvious exceptions being tuple- and list-indexing).
When you do spam = "green"
, you have bound the name spam
to the string object "green"
; if you then do eggs = spam
you have not copied anything, you have not made reference pointers; you have simply bound another name, eggs
, to the same object ("green"
in this case). If you then bind spam
to something else (spam = 3.14159
) eggs
will still be bound to "green"
.
When a for-loop executes, it takes the name you give it, and binds it in turn to each object in the iterable while running the loop; when you call a function, it takes the names in the function header and binds them to the arguments passed; reassigning a name is actually rebinding a name (it can take a while to absorb this -- it did for me, anyway).
With for-loops utilizing lists, there are two basic ways to assign back to the list:
for i, item in enumerate(some_list):
some_list[i] = process(item)
or
new_list = []
for item in some_list:
new_list.append(process(item))
some_list[:] = new_list
Notice the [:]
on that last some_list
-- it is causing a mutation of some_list
's elements (setting the entire thing to new_list
's elements) instead of rebinding the name some_list
to new_list
. Is this important? It depends! If you have other names besides some_list
bound to the same list object, and you want them to see the updates, then you need to use the slicing method; if you don't, or if you do not want them to see the updates, then rebind -- some_list = new_list
.
They're examples provided by the Android team, if you've already loaded Samples, you can import Home screen replacement sample by following these steps.
File > New > Other >Android > Android Sample Project > Android x.x > Home > Finish
But if you do not have samples loaded, then download it using the below steps
Windows > Android SDK Manager > chooses "Sample for SDK" for SDK you need it > Install package > Accept License > Install
You can use CSS white-space
property for \n
. You can also preserve the tabs as in \t
.
For line break \n
:
white-space: pre-line;
For line break \n
and tabs \t
:
white-space: pre-wrap;
document.getElementById('just-line-break').innerHTML = 'Testing 1\nTesting 2\n\tNo tab';_x000D_
_x000D_
document.getElementById('line-break-and-tab').innerHTML = 'Testing 1\nTesting 2\n\tWith tab';
_x000D_
#just-line-break {_x000D_
white-space: pre-line;_x000D_
}_x000D_
_x000D_
#line-break-and-tab {_x000D_
white-space: pre-wrap;_x000D_
}
_x000D_
<div id="just-line-break"></div>_x000D_
_x000D_
<br/>_x000D_
_x000D_
<div id="line-break-and-tab"></div>
_x000D_
In a sense you're right, although anything lower than 2^8 characters will still register as a byte of data.
If you account for the base character that leaves anything with a VARCHAR < 255 as consuming the same amount of space.
255 is a good baseline definition unless you particularly wish to curtail excessive input.
The apps UI only works for panels.
The best you can do is to draw a button yourself and put that into your spreadsheet. Than you can add a macro to it.
Go into "Insert > Drawing...", Draw a button and add it to the spreadsheet. Than click it and click "assign Macro...", then insert the name of the function you wish to execute there. The function must be defined in a script in the spreadsheet.
Alternatively you can also draw the button somewhere else and insert it as an image.
More info: https://developers.google.com/apps-script/guides/menus
Accept decimal values in text fields with single (.)dot working with iPad and iPhone in Swift 3
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
let inverseSet = NSCharacterSet(charactersIn:"0123456789").inverted
let components = string.components(separatedBy: inverseSet)
let filtered = components.joined(separator: "")
if filtered == string {
return true
} else {
if string == "." {
let countdots = textField.text!.components(separatedBy:".").count - 1
if countdots == 0 {
return true
}else{
if countdots > 0 && string == "." {
return false
} else {
return true
}
}
}else{
return false
}
}
}
You need to enable deep object dirty checking. By default angular only checks the reference of the top level variable that you watch.
App.directive('d3Visualization', function() {
return {
restrict: 'E',
scope: {
val: '='
},
link: function(scope, element, attrs) {
scope.$watch('val', function(newValue, oldValue) {
if (newValue)
console.log("I see a data change!");
}, true);
}
}
});
see Scope. The third parameter of the $watch function enables deep dirty checking if it's set to true.
Take note that deep dirty checking is expensive. So if you just need to watch the children array instead of the whole data
variable the watch the variable directly.
scope.$watch('val.children', function(newValue, oldValue) {}, true);
version 1.2.x introduced $watchCollection
Shallow watches the properties of an object and fires whenever any of the properties change (for arrays, this implies watching the array items; for object maps, this implies watching the properties)
scope.$watchCollection('val.children', function(newValue, oldValue) {});
Although @Pascal answer is perfectly valid, from my experience I find the code below helpful to accomplish optimistic locking:
@Entity
public class MyEntity implements Serializable {
// ...
@Version
@Column(name = "optlock", columnDefinition = "integer DEFAULT 0", nullable = false)
private long version = 0L;
// ...
}
Why? Because:
@Version
is accidentally set to null
.optlock
rather than version
.First point doesn't matter if application uses only JPA for inserting data into the database, as JPA vendor will enforce 0
for @version
field at creation time. But almost always plain SQL statements are also in use (at least during unit and integration testing).
Please Find below code
select trim(string_agg(value,' ')) from STRING_SPLIT(' single spaces only ',' ')
where value<>' '
This worked for me.. Hope this helps...
One way I have gotten around this is by create a static class for instances. I used it a lot in AS3 I has worked great for me in android development too.
Config.java
public final class Config {
public static MyApp context = null;
}
MyApp.java
public class MyApp extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Config.context = this;
}
...
}
You can then access the context or by using Config.context
LocationManager locationManager;
String context = Context.LOCATION_SERVICE;
locationManager = Config.context.getSystemService(context);
Another approach is to use the CommaDelimitedStringCollection class from System.Configuration namespace/assembly. It behaves like a list plus it has an overriden ToString method that returns a comma-separated string.
Pros - More flexible than an array.
Cons - You can't pass a string containing a comma.
CommaDelimitedStringCollection list = new CommaDelimitedStringCollection();
list.AddRange(new string[] { "Huey", "Dewey" });
list.Add("Louie");
//list.Add(",");
string s = list.ToString(); //Huey,Dewey,Louie
input[type=checkbox].css-checkbox {
position: absolute;
overflow: hidden;
clip: rect(0 0 0 0);
height: 1px;
width: 1px;
margin: -1px;
padding: 0;
border: 0;
}
input[type=checkbox].css-checkbox + label.css-label {
padding-left: 20px;
height: 15px;
display: inline-block;
line-height: 15px;
background-repeat: no-repeat;
background-position: 0 0;
font-size: 15px;
vertical-align: middle;
cursor: pointer;
}
input[type=checkbox].css-checkbox:checked + label.css-label {
background-position: 0 -15px;
}
.css-label{
background-image:url(http://csscheckbox.com/checkboxes/dark-check-green.png);
}
Try Restarting the editor in which you are writing the code(VS code or Sublime). Compile and Run it again. I have done the same and it worked.
This happens when you add a new class outside from your editor or keep running your angular cli 'ng serve'. Actually your editor or the 'ng serve' command may not able to find the newly created files.
If you want just the time in a shell variable then this works:
var=`{ time <command> ; } 2>&1 1>/dev/null`
Here's a much newer Kotlin solution for this which is much simpler than many of the answers written here, it uses anonymous class.
val items = mutableListOf<String>()
inner class ItemHolder(view: View): RecyclerView.ViewHolder(view) {
var textField: TextView = view.findViewById(android.R.id.text1) as TextView
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
rvitems.layoutManager = LinearLayoutManager(context)
rvitems.adapter = object : RecyclerView.Adapter<ItemHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ItemHolder {
return ItemHolder(LayoutInflater.from(parent.context).inflate(android.R.layout.simple_list_item_1, parent, false))
}
override fun getItemCount(): Int {
return items.size
}
override fun onBindViewHolder(holder: ItemHolder, position: Int) {
holder.textField.text = items[position]
holder.textField.setOnClickListener {
Toast.makeText(context, "Clicked $position", Toast.LENGTH_SHORT).show()
}
}
}
}
I took the liberty to use android.R.layout.simple_list_item_1 as it's simpler. I wanted to simplify it even further and put ItemHolder as an inner class but couldn't quite figure out how to reference it in a type in the outer class parameter.
Apparently, gcc doesn't behave like the one described in The C Programming language, where it says that the command cc helloworld.c produces a file called a.out which can be run by typing a.out on the prompt.
A Unix hasn't behaved in that way by default (so you can just write the executable name without ./ at the front) in a long time. It's called a.exe, because else Windows won't execute it, as it gets file types from the extension.
You can proceed as follows to check whether a JToken Value is null
JToken token = jObject["key"];
if(token.Type == JTokenType.Null)
{
// Do your logic
}
The difference between Func
and Action
is simply whether you want the delegate to return a value (use Func
) or not (use Action
).
Func
is probably most commonly used in LINQ - for example in projections:
list.Select(x => x.SomeProperty)
or filtering:
list.Where(x => x.SomeValue == someOtherValue)
or key selection:
list.Join(otherList, x => x.FirstKey, y => y.SecondKey, ...)
Action
is more commonly used for things like List<T>.ForEach
: execute the given action for each item in the list. I use this less often than Func
, although I do sometimes use the parameterless version for things like Control.BeginInvoke
and Dispatcher.BeginInvoke
.
Predicate
is just a special cased Func<T, bool>
really, introduced before all of the Func
and most of the Action
delegates came along. I suspect that if we'd already had Func
and Action
in their various guises, Predicate
wouldn't have been introduced... although it does impart a certain meaning to the use of the delegate, whereas Func
and Action
are used for widely disparate purposes.
Predicate
is mostly used in List<T>
for methods like FindAll
and RemoveAll
.
You can use os.listdir
for this purpose. If you only want files and not directories, you can filter the results using os.path.isfile
.
example:
files = os.listdir(os.curdir) #files and directories
or
files = filter(os.path.isfile, os.listdir( os.curdir ) ) # files only
files = [ f for f in os.listdir( os.curdir ) if os.path.isfile(f) ] #list comprehension version.
With Java 8 you can do this without any third party library.
If you want to join a Collection of Strings you can use the new String.join() method:
List<String> list = Arrays.asList("foo", "bar", "baz");
String joined = String.join(" and ", list); // "foo and bar and baz"
If you have a Collection with another type than String you can use the Stream API with the joining Collector:
List<Person> list = Arrays.asList(
new Person("John", "Smith"),
new Person("Anna", "Martinez"),
new Person("Paul", "Watson ")
);
String joinedFirstNames = list.stream()
.map(Person::getFirstName)
.collect(Collectors.joining(", ")); // "John, Anna, Paul"
The StringJoiner
class may also be useful.
You can do something like this to count from a list of things.
IList<String> names = new List<string>() { "ToString", "Format" };
IEnumerable<String> methodNames = typeof(String).GetMethods().Select(x => x.Name);
int count = methodNames.Where(x => names.Contains(x)).Count();
To count a single element
string occur = "Test1";
IList<String> words = new List<string>() {"Test1","Test2","Test3","Test1"};
int count = words.Where(x => x.Equals(occur)).Count();
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_CANCELED)
{
//do not process data, I use return; to resume activity calling camera intent
enter code here
}
}
You might consider using double slashes on your directory e.g
app.get('/',(req,res)=>{_x000D_
res.sendFile('C:\\Users\\DOREEN\\Desktop\\Fitness Finder' + '/index.html')_x000D_
})
_x000D_
What do you actually want to achieve? What your code does is it tries to connect to a server located at 192.168.1.104:4000
. Is this the address of a server that sends the messages (because this looks like a client-side code)? If I run fake server locally:
$ nc -l 4000
...and change socket address to localhost:4000
, it will work and try to read something from nc
-created server.
ServerSocket
and listen on it:ServerSocket serverSocket = new ServerSocket(4000);
Socket socket = serverSocket.accept();
The second line will block until some other piece of software connects to your machine on port 4000. Then you can read from the returned socket. Look at this tutorial, this is actually a very broad topic (threading, protocols...)
This section of the boto3 documentation is helpful.
Here's what worked for me:
session = boto3.Session(profile_name='dev')
client = session.client('cloudfront')
For simple code, may be i think
import os
os.system('youtube-dl [OPTIONS] URL [URL...]')
Above is just running command line inside python.
Other is mentioned in the documentation Using youtube-dl on python Here is the way
from __future__ import unicode_literals
import youtube_dl
ydl_opts = {}
with youtube_dl.YoutubeDL(ydl_opts) as ydl:
ydl.download(['https://www.youtube.com/watch?v=BaW_jenozKc'])
Declare @fs_e int, @C_Tables CURSOR, @Table varchar(50)
SET @C_Tables = CURSOR FOR
select name from sysobjects where OBJECTPROPERTY(id, N'IsUserTable') = 1 AND name like 'TR_%'
OPEN @C_Tables
FETCH @C_Tables INTO @Table
SELECT @fs_e = sdec.fetch_Status FROM sys.dm_exec_cursors(0) as sdec where sdec.name = '@C_Tables'
WHILE ( @fs_e <> -1)
BEGIN
exec('Select * from ' + @Table)
FETCH @C_Tables INTO @Table
SELECT @fs_e = sdec.fetch_Status FROM sys.dm_exec_cursors(0) as sdec where sdec.name = '@C_Tables'
END
Imagine it like this: When your sub-class inherits properties from a super-class, they don't magically appear. You still have to construct the object. So, you call the base constructor. Imagine if you class inherits a variable, which your super-class constructor initializes to an important value. If we didn't do this, your code could fail because the variable wasn't initialized.
I usually use this method
public static SelectList SetSelectedValue(SelectList list, string value)
{
if (value != null)
{
var selected = list.Where(x => x.Value == value).First();
selected.Selected = true;
return list;
}
return list;
}
For checking existence of key in NSDictionary:
if([dictionary objectForKey:@"Replace your key here"] != nil)
NSLog(@"Key Exists");
else
NSLog(@"Key not Exists");
There are no unsigned integers in Java. All integers are signed and in big endian.
On the C side the each byte has tne LSB at the start is on the left and the MSB at the end.
It sounds like you are using LSB as Least significant bit, are you? LSB usually stands for least significant byte. Endianness is not bit based but byte based.
To convert from unsigned byte to a Java integer:
int i = (int) b & 0xFF;
To convert from unsigned 32-bit little-endian in byte[] to Java long (from the top of my head, not tested):
long l = (long)b[0] & 0xFF;
l += ((long)b[1] & 0xFF) << 8;
l += ((long)b[2] & 0xFF) << 16;
l += ((long)b[3] & 0xFF) << 24;
I had a similar requirement a while back. Its nothing to do with Guava but you can do something like this to be able to cleanly construct a Map
using a fluent builder.
Create a base class that extends Map.
public class FluentHashMap<K, V> extends LinkedHashMap<K, V> {
private static final long serialVersionUID = 4857340227048063855L;
public FluentHashMap() {}
public FluentHashMap<K, V> delete(Object key) {
this.remove(key);
return this;
}
}
Then create the fluent builder with methods that suit your needs:
public class ValueMap extends FluentHashMap<String, Object> {
private static final long serialVersionUID = 1L;
public ValueMap() {}
public ValueMap withValue(String key, String val) {
super.put(key, val);
return this;
}
... Add withXYZ to suit...
}
You can then implement it like this:
ValueMap map = new ValueMap()
.withValue("key 1", "value 1")
.withValue("key 2", "value 2")
.withValue("key 3", "value 3")
Multiply by 1000, round, and divide back by 1000.
For basic Java: http://download.oracle.com/javase/tutorial/getStarted/index.html and http://download.oracle.com/javase/tutorial/java/index.html
From Python v2.7.14 documentation - 18.1.11. email: Examples:
Here’s an example of how to create an HTML message with an alternative plain text version:
#! /usr/bin/python
import smtplib
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
# me == my email address
# you == recipient's email address
me = "[email protected]"
you = "[email protected]"
# Create message container - the correct MIME type is multipart/alternative.
msg = MIMEMultipart('alternative')
msg['Subject'] = "Link"
msg['From'] = me
msg['To'] = you
# Create the body of the message (a plain-text and an HTML version).
text = "Hi!\nHow are you?\nHere is the link you wanted:\nhttp://www.python.org"
html = """\
<html>
<head></head>
<body>
<p>Hi!<br>
How are you?<br>
Here is the <a href="http://www.python.org">link</a> you wanted.
</p>
</body>
</html>
"""
# Record the MIME types of both parts - text/plain and text/html.
part1 = MIMEText(text, 'plain')
part2 = MIMEText(html, 'html')
# Attach parts into message container.
# According to RFC 2046, the last part of a multipart message, in this case
# the HTML message, is best and preferred.
msg.attach(part1)
msg.attach(part2)
# Send the message via local SMTP server.
s = smtplib.SMTP('localhost')
# sendmail function takes 3 arguments: sender's address, recipient's address
# and message to send - here it is sent as one string.
s.sendmail(me, you, msg.as_string())
s.quit()
Doing the expicit casting to the "int" solves the problem in my case. I had the same issue. So:
int count = (int)[myColors count];
Some solutions didn't work for me but the best option I found was the example below when i decided to use the flex option.
html, body{
height: 100%;
}
body{
display: flex;
flex-direction: column;
}
.main-contents{
flex: 1 0 auto;
min-height: 100%;
margin-bottom: -77px;
background-color: #CCC;
}
.footer{
height: 77px;
min-height: 77px;
width: 100%;
bottom: 0;
left: 0;
background: #000000;
flex-shrink: 0;
flex-direction: row;
position: relative;
}
.footer-text{
color: #FFF;
}
@media screen and (max-width: 767px){
#content{
padding-bottom: 0;
}
.footer{
position: relative;
/*position: absolute;*/
height: 77px;
width: 100%;
bottom: 0;
left: 0;
}
}
_x000D_
<html>
<body>
<div class="main-contents" >
this is the main content
</div>
</body>
<footer class="footer">
<p class="footer-text">This is the sticky footer</p>
</footer>
</html>
_x000D_
This worked for me on all browsers:
$ string="test"
$ string="${string}test2"
$ echo $string
testtest2
Bound method = instance method
Unbound method = static method.
When you speak of tests, you could mean waterfall or agile test development. In an agile environment, developers should spend 50% of their time developing and maintaining tests.
But that 50% extra will save you time when the re-factoring and manual verification time comes.
This will make the scroll bars always display when there is content within windows that must be scrolled to access, it applies to all windows and all apps on the Mac:
Launch System Preferences from the ? Apple menu Click on the “General” settings panel Look for ‘Show scroll bars’ and select the radiobox next to “Always” Close out of System Preferences when finished
A straightforward conversion would be (again with a function):
def add_nulls2(int, cnt):
nulls = str(int)
for i in range(cnt - len(str(int))):
nulls = '0' + nulls
return nulls
For me worked this one:
ALTER TABLE tablename MODIFY fieldname VARCHAR(128) NOT NULL;
Had the same with IDEA 14.1.5, Kotlin v.1.0.0-beta-1038-IJ141-17.
Kotlin gets its own list entry (like Java) when creating new project, but the only working config was:
New | Project | Java | "Kotlin (Java)" (make sure you have Project SDK configured, too)
use library: Create, "Copy to: lib".
That's exactly how you use it. There is a possibility that the address you have does not correspond to something directly in your source code though.
For example:
$ cat t.c
#include <stdio.h>
int main()
{
printf("hello\n");
return 0;
}
$ gcc -g t.c
$ addr2line -e a.out 0x400534
/tmp/t.c:3
$ addr2line -e a.out 0x400550
??:0
0x400534
is the address of main
in my case. 0x400408
is also a valid function address in a.out
, but it's a piece of code generated/imported by GCC, that has no debug info. (In this case, __libc_csu_init
. You can see the layout of your executable with readelf -a your_exe
.)
Other times when addr2line
will fail is if you're including a library that has no debug information.
There needs to be some type of backend framework to send the email. This can be done via PHP/ASP.NET, or with the local mail client. If you want the user to see nothing, the best way is to tap into those by an AJAX call to a separate send_email file.
Try this please
DELETE FROM messages,usersmessages
USING messages
INNER JOIN usermessages on (messages.messageid = usersmessages.messageid)
WHERE messages.messsageid='1'
I just experienced this with the line:
$('<div id="editor" />').dialogelfinder({
I got the error "dialogelfinder is not a function" because another component was inserting a call to load an older version of JQuery (1.7.2) after the newer version was loaded.
As soon as I commented out the second load, the error went away.
Note that if you want to comment out a single line of printing erb you should do like this
<%#= ["Buck", "Papandreou"].join(" you ") %>
If you want them gone by default, you can set:
Chart.defaults.scale.gridLines.display = false;
you can go:
var cp = require('child_process');
and then:
cp.exec('./myScript.sh', function(err, stdout, stderr) {
// handle err, stdout, stderr
});
to run a command in your $SHELL.
Or go
cp.spawn('./myScript.sh', [args], function(err, stdout, stderr) {
// handle err, stdout, stderr
});
to run a file WITHOUT a shell.
Or go
cp.execFile();
which is the same as cp.exec() but doesn't look in the $PATH.
You can also go
cp.fork('myJS.js', function(err, stdout, stderr) {
// handle err, stdout, stderr
});
to run a javascript file with node.js, but in a child process (for big programs).
You might also have to access stdin and stdout with event listeners. e.g.:
var child = cp.spawn('./myScript.sh', [args]);
child.stdout.on('data', function(data) {
// handle stdout as `data`
});
I think MAVEN_OPTS
would be most appropriate for you. See here: http://maven.apache.org/configure.html
In Unix:
Add the
MAVEN_OPTS
environment variable to specify JVM properties, e.g.export MAVEN_OPTS="-Xms256m -Xmx512m"
. This environment variable can be used to supply extra options to Maven.
In Win, you need to set environment variable via the dialogue box
Add ... environment variable by opening up the system properties (
WinKey + Pause
),... In the same dialog, add theMAVEN_OPTS
environment variable in the user variables to specify JVM properties, e.g. the value-Xms256m -Xmx512m
. This environment variable can be used to supply extra options to Maven.
application/xml
is seen by svn
as binary type whereas text/xml
as text file for which a diff can be displayed.
We could simply write the following method
public static void ClearLine()
{
Console.SetCursorPosition(0, Console.CursorTop - 1);
Console.Write(new string(' ', Console.WindowWidth));
Console.SetCursorPosition(0, Console.CursorTop - 1);
}
and then call it when needed like this
Console.WriteLine("Test");
ClearLine();
It works fine for me.
There is no extra backslash, it's just formatted that way in the interactive environment. Try:
print string
Then you can see that there really is no extra backslash.
Put your JAR in app/libs, and in app/build.gradle add in the dependencies
section:
compile fileTree(dir: 'libs', include: ['*.jar'])
Technically speaking the answer is correct, but there is a potential problem remaining.
string test = rb.SelectedValue
is an object and while this implicit cast works. It may not work correction if you were sending it to another method (and granted this may depend on the version of framework, I am unsure) it may not recognize the value.
string test = rb.SelectedValue; //May work fine
SomeMethod(rb.SelectedValue);
where SomeMethod
is expecting a string may not.
Sadly the rb.SelectedValue.ToString();
can save a few unexpected issues.
I tried (with minor changes as suggested) the code from Andrew Cooke's answer. (I am running python 2.7).
The code:
#!/usr/bin/env python
class Celsius:
def __get__(self, instance, owner): return 9 * (instance.fahrenheit + 32) / 5.0
def __set__(self, instance, value): instance.fahrenheit = 32 + 5 * value / 9.0
class Temperature:
def __init__(self, initial_f): self.fahrenheit = initial_f
celsius = Celsius()
if __name__ == "__main__":
t = Temperature(212)
print(t.celsius)
t.celsius = 0
print(t.fahrenheit)
The result:
C:\Users\gkuhn\Desktop>python test2.py
<__main__.Celsius instance at 0x02E95A80>
212
With Python prior to 3, make sure you subclass from object which will make the descriptor work correctly as the get magic does not work for old style classes.
>>> foo = 'BS1 1AB'
>>> foo.replace(" ", "").rstrip()[:-3].upper()
'BS1'
The trick is a second .box-inner
inside, which is larger in width than the original .box
, and the box-shadow
is applied to that.
Then, added more padding to the .text
to make up for the added width.
Use max width for .inner-box
to not cause .box
to get wider, and overflow
to make sure the remaining is clipped:
.box {
max-width: 100% !important;
overflow: hidden;
}
110% is wider than the parent which is 100% in a child's context (should be the same when the parent .box
has a fixed width, for example).
Negative margins make up for the width and cause the element to be centered (instead of only the right part hiding):
.box-inner {
width: 110%;
margin-left:-5%;
margin-right: -5%;
-webkit-box-shadow: inset 0px 5px 10px 1px #000000;
box-shadow: inset 0px 5px 10px 1px #000000;
}
And add some padding on the X axis to make up for the wider .inner-box
:
.text {
padding: 20px 40px;
}
If you inspect the Fiddle, you'll see:
Here is my Maven setup. You can use it as an example. You don't need anything else in order to use Maven.
M2_HOME is used for both Maven 2 and 3
export M2_HOME=/Users/xxx/sdk/apache-maven-3.0.5
export M2=$M2_HOME/bin
export MAVEN_OPTS="-Xmx1048m -Xms256m -XX:MaxPermSize=312M"
export PATH=$M2:$PATH
You just need to use below code when launching the new activity.
startActivity(new Intent(this, newactivity.class));
finish();
For formatting the price in another currency than the current one:
Mage::app()->getLocale()->currency('EUR')->toCurrency($price);
Basically indexOf()
is a method belongs to string(array object also), But while calling the function you are passing a number, try to cast it to a string and pass it.
document.getElementById("oset").innerHTML = timeD2C(timeofday + "");
var timeofday = new Date().getHours() + (new Date().getMinutes()) / 60;_x000D_
_x000D_
_x000D_
_x000D_
_x000D_
function timeD2C(time) { // Converts 11.5 (decimal) to 11:30 (colon)_x000D_
var pos = time.indexOf('.');_x000D_
var hrs = time.substr(1, pos - 1);_x000D_
var min = (time.substr(pos, 2)) * 60;_x000D_
_x000D_
if (hrs > 11) {_x000D_
hrs = (hrs - 12) + ":" + min + " PM";_x000D_
} else {_x000D_
hrs += ":" + min + " AM";_x000D_
}_x000D_
return hrs;_x000D_
}_x000D_
alert(timeD2C(timeofday+""));
_x000D_
And it is good to do the string conversion inside your function definition,
function timeD2C(time) {
time = time + "";
var pos = time.indexOf('.');
So that the code flow won't break at times when devs forget to pass a string into this function.
It does not cause problems but it's a trick to do the same as PreventDefault
when you're way down in the page and an anchor as:
<a href="#" onclick="fn()">click here</a>
you will jump to the top and the URL will have the anchor #
as well, to avoid this we simply return false;
or use javascript:void(0);
regarding your examples
<a onclick="fn()">Does not appear as a link, because there's no href</a>
just do a {text-decoration:underline;}
and you will have "link a-like"
<a href="javascript:void(0)" onclick="fn()">fn is called</a>
<a href="javascript:" onclick="fn()">fn is called too!</a>
it's ok, but in your function
at the end, just return false;
to prevent the default behavior, you don't need to do anything more.
moment.js has some really nice convenience methods to manipulate date objects
The .subtract method, allows you to subtract a certain amount of time units from a date, by providing the amount and a timeunit string.
var now = new Date();
// Sun Jan 22 2017 17:12:18 GMT+0200 ...
var olderDate = moment(now).subtract(3, 'minutes').toDate();
// Sun Jan 22 2017 17:09:18 GMT+0200 ...
You're declaring everything in the parent page. So the references to window
and document
are to the parent page's. If you want to do stuff to the iframe
's, use iframe || iframe.contentWindow
to access its window
, and iframe.contentDocument || iframe.contentWindow.document
to access its document
.
There's a word for what's happening, possibly "lexical scope": What is lexical scope?
The only context of a scope is this. And in your example, the owner of the method is doc
, which is the iframe
's document
. Other than that, anything that's accessed in this function that uses known objects are the parent's (if not declared in the function). It would be a different story if the function were declared in a different place, but it's declared in the parent page.
This is how I would write it:
(function () {
var dom, win, doc, where, iframe;
iframe = document.createElement('iframe');
iframe.src = "javascript:false";
where = document.getElementsByTagName('script')[0];
where.parentNode.insertBefore(iframe, where);
win = iframe.contentWindow || iframe;
doc = iframe.contentDocument || iframe.contentWindow.document;
doc.open();
doc._l = (function (w, d) {
return function () {
w.vanishing_global = new Date().getTime();
var js = d.createElement("script");
js.src = 'test-vanishing-global.js?' + w.vanishing_global;
w.name = "foobar";
d.foobar = "foobar:" + Math.random();
d.foobar = "barfoo:" + Math.random();
d.body.appendChild(js);
};
})(win, doc);
doc.write('<body onload="document._l();"></body>');
doc.close();
})();
The aliasing of win
and doc
as w
and d
aren't necessary, it just might make it less confusing because of the misunderstanding of scopes. This way, they are parameters and you have to reference them to access the iframe
's stuff. If you want to access the parent's, you still use window
and document
.
I'm not sure what the implications are of adding methods to a document
(doc
in this case), but it might make more sense to set the _l
method on win
. That way, things can be run without a prefix...such as <body onload="_l();"></body>
ElementFormDefault has nothing to do with namespace of the types in the schema, it's about the namespaces of the elements in XML documents which comply with the schema.
Here's the relevent section of the spec:
Element Declaration Schema Component Property {target namespace} Representation If form is present and its ·actual value· is qualified, or if form is absent and the ·actual value· of elementFormDefault on the <schema> ancestor is qualified, then the ·actual value· of the targetNamespace [attribute] of the parent <schema> element information item, or ·absent· if there is none, otherwise ·absent·.
What that means is that the targetNamespace you've declared at the top of the schema only applies to elements in the schema compliant XML document if either elementFormDefault is "qualified" or the element is declared explicitly in the schema as having form="qualified".
For example: If elementFormDefault is unqualified -
<element name="name" type="string" form="qualified"></element>
<element name="page" type="target:TypePage"></element>
will expect "name" elements to be in the targetNamespace and "page" elements to be in the null namespace.
To save you having to put form="qualified" on every element declaration, stating elementFormDefault="qualified" means that the targetNamespace applies to each element unless overridden by putting form="unqualified" on the element declaration.
You could try this registry hack:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters]
"DeadGWDetectDefault"=dword:00000001
"KeepAliveTime"=dword:00120000
If it works, just keep increasing the KeepAliveTime
. It is currently set for 2 minutes.
This is very simple If you have already set a remote origin url then you use
set-url
command to change that, otherwise simply useadd
command
git remote -v
Check if any remote already existsgit remote set-url origin [email protected]:User/UserRepo.git
to change the origingit remote add origin [email protected]:User/UserRepo.git
to set new origin for your repo.git push -u origin master
to push your code to remote and add upstream (tracking) reference to your remote branch.NOTE: If you use -u
flag, its for upstream, it enables you to use simply git pull
instead of git pull origin <branch-name>
in upcoming operations.
Happy Coding ;)
You can just run:
git stash pop
and it will unstash your changes.
If you want to preserve the state of files (staged vs. working), use
git stash apply --index
If there is polymorphism such as checking SQLRecoverableException vs SQLException, it can be done like that.
try {
// sth may throw exception
....
} catch (Exception e) {
if(SQLException.class.isAssignableFrom(e.getCause().getClass()))
{
// do sth
System.out.println("SQLException occurs!");
}
}
Simply say,
ChildClass child= new ChildClass();
if(ParentClass.class.isAssignableFrom(child.getClass()))
{
// do sth
...
}
Tried the below program , With both the approach. 1. With clearing the arraylist obj in for loop 2. creating new New Arraylist in for loop.
List al= new ArrayList();
for(int i=0;i<100;i++)
{
//List al= new ArrayList();
for(int j=0;j<10;j++)
{
al.add(Integer.parseInt("" +j+i));
//System.out.println("Obj val " +al.get(j));
}
//System.out.println("Hashcode : " + al.hashCode());
al.clear();
}
and to my surprise. the memory allocation didnt change much.
With New Arraylist approach.
Before loop total free memory: 64,909 ::
After loop total free memory: 64,775 ::
with Clear approach,
Before loop total free memory: 64,909 :: After loop total free memory: 64,765 ::
So this says there is not much difference in using arraylist.clear from memory utilization perspective.
It is impossible to terminate a thread unless the code running in that thread checks for and allows termination.
You said: "Sadly I must kill/restart it ... I don't have complete control over the contents of the thread and for my situation it requires a restart"
If the contents of the thread does not allow for termination of its exectuion then you can not terminate that thread.
In your post you said: "My first attempt was with ExecutorService but I can't seem to find a way for it restart a task. When I use .shutdownnow()..."
If you look at the source of "shutdownnow" it just runs through and interrupts the currently running threads. This will not stop their execution unless the code in those threads checks to see if it has been ineterrupted and, if so, stops execution itself. So shutdownnow is probably not doing what you think.
Let me illustrate what I mean when I say that the contents of the thread must allow for that thread to be terminated:
myExecutor.execute(new Runnable() {
public void run() {
while (true) {
System.out.println("running");
}
}
});
myExecutor.shutdownnow();
That thread will continue to run forever, even though shutdownnow was called, because it never checks to see if it has been terminated or not. This thread, however, will shut down:
myExecutor.execute(new Runnable() {
public void run() {
while (!Thread.interrupted()) {
System.out.println("running");
}
}
});
myExecutor.shutdownnow();
Since this thread checks to see whether or not it has been interrupted / shut down / terminated.
So if you want a thread that you can shut down, you need to make sure it checks to see if it has been interrupted. If you want a thread that you can "shut down" and "restart" you can make a runnable that can take new tasks as was mentioned before.
Why can you not shut down a running thread? Well I actually lied, you can call "yourThread.stop()" but why is this a bad idea? The thread could be in a synchronized (or other critical section, but we will limit ourselves to setions guarded by the syncrhonized key word here) section of code when you stop it. synch blocks are supposed to be executed in their entirity and only by one thread before being accessed by some other thread. If you stop a thread in the middle of a synch block, the protection put into place by the synch block is invalidated and your program will get into an unknown state. Developers make put stuff in synch blocks to keep things in synch, if you use threadInstance.stop() you destroy the meaning of synchronize, what the developer of that code was trying to accomplish and how the developer of that code expected his synchronized blocks to behave.
a {
target-name: new;
target-new: tab;
}
The target-new property specifies whether new destination links should open in a new window or in a new tab of an existing window.
Note: The target-new property only works if the target-name property creates a new tab or a new window.
Based on Nicolas Gauthier answer:
var strng = 'someobj.someCallback';
var data = 'someData';
var func = window;
var funcSplit = strng.split('.');
for(i = 0;i < funcSplit.length;i++){
//We maybe can check typeof and break the bucle if typeof != function
func = func[funcSplit[i]];
}
func(data);
Use:
1..10 | % { write "loop $_" }
Output:
PS D:\temp> 1..10 | % { write "loop $_" }
loop 1
loop 2
loop 3
loop 4
loop 5
loop 6
loop 7
loop 8
loop 9
loop 10
You can use crypto-js.
To use crypto-js, you need to load core.js then md5.js .
A list of URLs are here https://cdnjs.com/libraries/crypto-js
cryptojs is also available in zip form here https://code.google.com/archive/p/crypto-js/downloads
There is an answer from answerer 'amal' in 2013, that is similar to this but a)his link to md5.js no longer works b)he didn't load core.js beforehand, which is necessary.
<html>
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/components/core.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/rollups/md5.js"></script>
<script>
var hash = CryptoJS.MD5("Message");
console.log(hash);
</script>
</head>
<body>
</body>
</html>
try using javascript for this! Seems like its the best and easiest way to do this. You'll get inbuilt funcn to execute a html code only after HTML page loads completely.
or else you may use state based programming where an event occurs at a particular state of the browser..
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js</script> <script>
$(document).ready(function(){
$("button").click(function(){
$("p").toggle();
});
});
</script>
</head>
<body>
<p>Welcome !!!</p>
<button>Toggle between hide() and show()</button>
</body>
</html>
typeof
is applied to a name of a type or generic type parameter known at compile time (given as identifier, not as string). GetType
is called on an object at runtime. In both cases the result is an object of the type System.Type
containing meta-information on a type.
Example where compile-time and run-time types are equal
string s = "hello";
Type t1 = typeof(string);
Type t2 = s.GetType();
t1 == t2 ==> true
Example where compile-time and run-time types are different
object obj = "hello";
Type t1 = typeof(object); // ==> object
Type t2 = obj.GetType(); // ==> string!
t1 == t2 ==> false
i.e., the compile time type (static type) of the variable obj
is not the same as the runtime type of the object referenced by obj
.
Testing types
If, however, you only want to know whether mycontrol
is a TextBox
then you can simply test
if (mycontrol is TextBox)
Note that this is not completely equivalent to
if (mycontrol.GetType() == typeof(TextBox))
because mycontrol
could have a type that is derived from TextBox
. In that case the first comparison yields true
and the second false
! The first and easier variant is OK in most cases, since a control derived from TextBox
inherits everything that TextBox
has, probably adds more to it and is therefore assignment compatible to TextBox
.
public class MySpecializedTextBox : TextBox
{
}
MySpecializedTextBox specialized = new MySpecializedTextBox();
if (specialized is TextBox) ==> true
if (specialized.GetType() == typeof(TextBox)) ==> false
Casting
If you have the following test followed by a cast and T is nullable ...
if (obj is T) {
T x = (T)obj; // The casting tests, whether obj is T again!
...
}
... you can change it to ...
T x = obj as T;
if (x != null) {
...
}
Testing whether a value is of a given type and casting (which involves this same test again) can both be time consuming for long inheritance chains. Using the as
operator followed by a test for null
is more performing.
Starting with C# 7.0 you can simplify the code by using pattern matching:
if (obj is T t) {
// t is a variable of type T having a non-null value.
...
}
Btw.: this works for value types as well. Very handy for testing and unboxing. Note that you cannot test for nullable value types:
if (o is int? ni) ===> does NOT compile!
This is because either the value is null
or it is an int
. This works for int? o
as well as for object o = new Nullable<int>(x);
:
if (o is int i) ===> OK!
I like it, because it eliminates the need to access the Nullable<T>.Value
property.
For bash, store your command like this:
command="ls | grep -c '^'"
Run your command like this:
echo $command | bash
Assuming that the *.bak file is on the same machine as the SQL Express instance it might be a permissions issue.
If you download procmon http://technet.microsoft.com/en-us/sysinternals/bb896645.aspx you can filter on that file path, look for ACCESS_DENIED errors and if any are there you can see the account name that's failing get to access.
The default for matrix
is to have 1 column. To explicitly have 0 columns, you need to write
matrix(, nrow = 15, ncol = 0)
A better way would be to preallocate the entire matrix and then fill it in
mat <- matrix(, nrow = 15, ncol = n.columns)
for(column in 1:n.columns){
mat[, column] <- vector
}
A = zeros(20, 10, 3); %# Creates a 20x10x3 matrix
B = zeros(4,4);
C = zeros(size(B,1), size(B,2), 4); %# New matrix with B's size, and 3rd dimension of size 4
C(:,:,1) = B; %# Copy the content of B into C's first set of values
zeros is just one way of making a new matrix. Another could be A(1:20,1:10,1:3) = 0
for a 3D matrix. To confirm the size of your matrices you can run: size(A)
which gives 20 10 3
.
There is no explicit bound on the number of dimensions a matrix may have.
You can specify the -t
option (--target
) to specify the destination directory. See pip install --help
for detailed information. This is the command you need:
pip install -t path_to_your_home package-name
for example, for installing say mxnet, in my $HOME
directory, I type:
pip install -t /home/foivos/ mxnet
There is two steps to extract year for all the dataframe without using method apply.
Step1
convert the column to datetime :
df['ArrivalDate']=pd.to_datetime(df['ArrivalDate'], format='%Y-%m-%d')
Step2
extract the year or the month using DatetimeIndex()
method
pd.DatetimeIndex(df['ArrivalDate']).year
Easiest solution to force UTF-8 encoding in Spring MVC returning String:
In @RequestMapping
, use:
produces = MediaType.APPLICATION_JSON_VALUE + "; charset=utf-8"
it is completely transparent Edittext with transparent background.
<item>
<shape android:shape="rectangle" >
<solid android:color="@color/transparent" />
</shape>
</item>
<item android:top="-3dp" android:right="-3dp" android:left="-3dp">
<shape>
<solid android:color="@android:color/transparent" />
<stroke
android:width="2dp"
android:color="@color/bottomline" />
</shape>
</item>
Press Ctrl+Shift and double-click a shortcut to run as an elevated process.
Works from the start menu as well.
Here is a simple AppCompatActivity extension function, which closes opened Dialog Fragment:
fun AppCompatActivity.whenDialogOpenDismiss(
tag: String
) {
supportFragmentManager.findFragmentByTag(tag)?.let {
if(it is DialogFragment) it.dismiss() }
}
Of course you can call it from any activity directly. If you need to call it from a Fragment just make the same extension function about Fragment class
Replace Your onOptionsItemSelected
as:
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case OK_MENU_ITEM:
startActivity(new Intent(DashboardActivity.this, SettingActivity.class));
break;
// You can handle other cases Here.
default:
super.onOptionsItemSelected(item);
}
}
Here, I want to navigate from DashboardActivity
to SettingActivity
.
There's a good discussion of this issue here.
I ran into the same architectural problem: wanting a way of giving my application more organization and internal namespaces, without:
In the end, I decided to organize my code using file naming conventions rather than directories. A structure would look something like:
Then in code:
var app_config = require('./app.config');
var app_models_foo = require('./app.models.foo');
or just
var config = require('./app.config');
var foo = require('./app.models.foo');
and external dependencies are available from node_modules as usual:
var express = require('express');
In this way, all application code is hierarchically organized into modules and available to all other code relative to the application root.
The main disadvantage is of course that in a file browser, you can't expand/collapse the tree as though it was actually organized into directories. But I like that it's very explicit about where all code is coming from, and it doesn't use any 'magic'.
You can listen resize
event and fire where some dimension change
directive
(function() {
'use strict';
angular
.module('myApp.directives')
.directive('resize', ['$window', function ($window) {
return {
link: link,
restrict: 'A'
};
function link(scope, element, attrs){
scope.width = $window.innerWidth;
function onResize(){
// uncomment for only fire when $window.innerWidth change
// if (scope.width !== $window.innerWidth)
{
scope.width = $window.innerWidth;
scope.$digest();
}
};
function cleanUp() {
angular.element($window).off('resize', onResize);
}
angular.element($window).on('resize', onResize);
scope.$on('$destroy', cleanUp);
}
}]);
})();
In html
<div class="row" resize> ,
<div class="col-sm-2 col-xs-6" ng-repeat="v in tag.vod">
<h4 ng-bind="::v.known_as"></h4>
</div>
</div>
Controller :
$scope.$watch('width', function(old, newv){
console.log(old, newv);
})
function getFileName(path, isExtension){
var fullFileName, fileNameWithoutExtension;
// replace \ to /
while( path.indexOf("\\") !== -1 ){
path = path.replace("\\", "/");
}
fullFileName = path.split("/").pop();
return (isExtension) ? fullFileName : fullFileName.slice( 0, fullFileName.lastIndexOf(".") );
}
After much figuring out, the following worked for me:
gradle test --tests "a.b.c.MyTestFile.mySingleTest"
What you are seeing is a parameterized query. They are frequently used when executing dynamic SQL from a program.
For example, instead of writing this (note: pseudocode):
ODBCCommand cmd = new ODBCCommand("SELECT thingA FROM tableA WHERE thingB = 7")
result = cmd.Execute()
You write this:
ODBCCommand cmd = new ODBCCommand("SELECT thingA FROM tableA WHERE thingB = ?")
cmd.Parameters.Add(7)
result = cmd.Execute()
This has many advantages, as is probably obvious. One of the most important: the library functions which parse your parameters are clever, and ensure that strings are escaped properly. For example, if you write this:
string s = getStudentName()
cmd.CommandText = "SELECT * FROM students WHERE (name = '" + s + "')"
cmd.Execute()
What happens when the user enters this?
Robert'); DROP TABLE students; --
(Answer is here)
Write this instead:
s = getStudentName()
cmd.CommandText = "SELECT * FROM students WHERE name = ?"
cmd.Parameters.Add(s)
cmd.Execute()
Then the library will sanitize the input, producing this:
"SELECT * FROM students where name = 'Robert''); DROP TABLE students; --'"
Not all DBMS's use ?
. MS SQL uses named parameters, which I consider a huge improvement:
cmd.Text = "SELECT thingA FROM tableA WHERE thingB = @varname"
cmd.Parameters.AddWithValue("@varname", 7)
result = cmd.Execute()
Double.parseDouble(p.replace(',','.'))
...is very quick as it searches the underlying character array on a char-by-char basis. The string replace versions compile a RegEx to evaluate.
Basically replace(char,char) is about 10 times quicker and since you'll be doing these kind of things in low-level code it makes sense to think about this. The Hot Spot optimiser will not figure it out... Certainly doesn't on my system.
In my case the error came out of nowhere, but didn't let me push to the remote branch.
git fetch origin
And that solved it.
I agree this may not solve the issue for everyone, but before trying a more complex approach give it a shot at this one, nothing to loose.
from file2 import *
is making copies. You want to do this:
import file2
print file2.foo
print file2.SomeClass()
I always use Desktop first, mobile first doesn't have highest priority does it? IE< 8 will show mobile css..
normal css here:
@media screen and (max-width: 768px) {}
@media screen and (max-width: 480px) {}
sometimes some custom sizes. I don't like bootstrap etc.
Try both of these commands and see for yourself why arp is faster:
for ip in $(seq 1 254); do ping -c 1 10.185.0.$ip > /dev/null; [ $? -eq 0 ] && echo "10.185.0.$ip UP" || : ; done
for ip in $(seq 1 254); do arp -n 10.185.0.$ip | grep Address; [ $? -eq 0 ] && echo "10.185.0.$ip UP" || : ; done
The HelloFromCsharp.aspx
look like this
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="HelloFromCsharp.aspx.cs" Inherits="Test.HelloFromCsharp" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<p>
<%= clients%>
</p>
</form>
</body>
</html>
And the HelloFromCsharp.aspx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace Test
{
public partial class HelloFromCsharp : System.Web.UI.Page
{
public string clients;
protected void Page_Load(object sender, EventArgs e)
{
clients = "Hello From C#";
}
}
}
Radio buttons are,
<input type="radio" id="radio_1" class="radioButtons" name="radioButton" value="1">
<input type="radio" id="radio_2" class="radioButtons" name="radioButton" value="2">
to check on click,
$('.radioButtons').click(function(){
if($("#radio_1")[0].checked){
//logic here
}
});
Another option is using System.IO.File.AppendText
This is equivalent to the StreamWriter overloads others have given.
Also File.AppendAllText may give a slightly easier interface without having to worry about opening and closing the stream. Though you may need to then worry about putting in your own linebreaks. :)
i think this is simple enough and will do!
list = [",",",","!",";",":"] #the list goes on.....
theString = "dlkaj;lkdjf'adklfaj;lsd'fa'dfj;alkdjf" #is an example string;
newString="" #the unwanted character free string
for i in range(len(TheString)):
if theString[i] in list:
newString += "" #concatenate an empty string.
else:
newString += theString[i]
this is one way to do it. But if you are tired of keeping a list of characters that you want to remove, you can actually do it by using the order number of the strings you iterate through. the order number is the ascii value of that character. the ascii number for 0 as a char is 48 and the ascii number for lower case z is 122 so:
theString = "lkdsjf;alkd8a'asdjf;lkaheoialkdjf;ad"
newString = ""
for i in range(len(theString)):
if ord(theString[i]) < 48 or ord(theString[i]) > 122: #ord() => ascii num.
newString += ""
else:
newString += theString[i]
A catch-block in a try statement needs to catch exactly the exception that the code inside the try {}
-block can throw (or a super class of that).
try {
//do something that throws ExceptionA, e.g.
throw new ExceptionA("I am Exception Alpha!");
}
catch(ExceptionA e) {
//do something to handle the exception, e.g.
System.out.println("Message: " + e.getMessage());
}
What you are trying to do is this:
try {
throw new ExceptionB("I am Exception Bravo!");
}
catch(ExceptionA e) {
System.out.println("Message: " + e.getMessage());
}
This will lead to an compiler error, because your java knows that you are trying to catch an exception that will NEVER EVER EVER occur. Thus you would get: exception ExceptionA is never thrown in body of corresponding try statement
.
In [16]: df = DataFrame(np.random.randn(10,3))
In [17]: df.iloc[3:5,0] = np.nan
In [18]: df.iloc[4:6,1] = np.nan
In [19]: df.iloc[5:8,2] = np.nan
In [20]: df
Out[20]:
0 1 2
0 1.148272 0.227366 -2.368136
1 -0.820823 1.071471 -0.784713
2 0.157913 0.602857 0.665034
3 NaN -0.985188 -0.324136
4 NaN NaN 0.238512
5 0.769657 NaN NaN
6 0.141951 0.326064 NaN
7 -1.694475 -0.523440 NaN
8 0.352556 -0.551487 -1.639298
9 -2.067324 -0.492617 -1.675794
In [22]: df.mean()
Out[22]:
0 -0.251534
1 -0.040622
2 -0.841219
dtype: float64
Apply per-column the mean of that columns and fill
In [23]: df.apply(lambda x: x.fillna(x.mean()),axis=0)
Out[23]:
0 1 2
0 1.148272 0.227366 -2.368136
1 -0.820823 1.071471 -0.784713
2 0.157913 0.602857 0.665034
3 -0.251534 -0.985188 -0.324136
4 -0.251534 -0.040622 0.238512
5 0.769657 -0.040622 -0.841219
6 0.141951 0.326064 -0.841219
7 -1.694475 -0.523440 -0.841219
8 0.352556 -0.551487 -1.639298
9 -2.067324 -0.492617 -1.675794
And escape your values with mysql_real_escape_string since PHP6 won't do that for you anymore! :)
The above answers did not help me on Android, thanks to the Pshemo response that worked for me on Android. I will leave some of Pshemo's answer here :
split("\\\\n")
The subprocess call is a very literal-minded system call. it can be used for any generic process...hence does not know what to do with a Python script automatically.
Try
call ('python somescript.py')
If that doesn't work, you might want to try an absolute path, and/or check permissions on your Python script...the typical fun stuff.
Use .prop
instead (and clean up your selector string):
function disable(i){
$("#rbutton_"+i).prop("disabled",true);
}
generated HTML:
<button id="rbutton_1" onclick="disable(1)">Click me</button>
<!-- wrap your onclick in quotes -->
But the "best practices" approach is to use JavaScript event binding and this
instead:
$('.rbutton').on('click',function() {_x000D_
$(this).prop("disabled",true);_x000D_
});
_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>_x000D_
<button class="rbutton">Click me</button>
_x000D_
Since web.config file is xml file you can open web.config using xmldocument class. Get the node from that xml file that you want to update and then save xml file.
here is URL that explains in more detail how you can update web.config file programmatically.
http://patelshailesh.com/index.php/update-web-config-programmatically
Note: if you make any changes to web.config, ASP.NET detects that changes and it will reload your application(recycle application pool) and effect of that is data kept in Session, Application, and Cache will be lost (assuming session state is InProc and not using a state server or database).
To answer TJJ: But is it also possible to do this without copying the whole file? So, just to somehow create an additional vmdk-metafile, that references the raw dd-image.
Yes, it's possible. Here's how to use a flat disk image in VirtualBox:
First you create an image with dd in the usual way:
dd bs=512 count=60000 if=/dev/zero of=usbdrv.img
Then you can create a file for VirtualBox that references this image:
VBoxManage internalcommands createrawvmdk -filename "usbdrv.vmdk" -rawdisk "usbdrv.img"
You can use this image in VirtualBox as is, but depending on the guest OS it might not be visible immediately. For example, I experimented on using this method with a Windows guest OS and I had to do the following to give it a drive letter:
You might want to access your files on Linux. First dismount it from the guest OS to be sure and remove it from the virtual machine. Now we need to create a virtual device that references the partition.
sfdisk -d usbdrv.img
Response:
label: dos
label-id: 0xd367a714
device: usbdrv.img
unit: sectors
usbdrv.img1 : start= 63, size= 48132, type=4
Take note of the start position of the partition: 63. In the command below I used loop4 because it was the first available loop device in my case.
sudo losetup -o $((63*512)) loop4 usbdrv.img
mkdir usbdrv
sudo mount /dev/loop4 usbdrv
ls usbdrv -l
Response:
total 0
-rwxr-xr-x. 1 root root 0 Apr 5 17:13 'Test file.txt'
Yay!
The toString()
method returns a textual representation of an object. A basic implementation is already included in java.lang.Object
and so because all objects inherit from java.lang.Object
it is guaranteed that every object in Java has this method.
Overriding the method is always a good idea, especially when it comes to debugging, because debuggers often show objects by the result of the toString()
method. So use a meaningful implementation but use it for technical purposes. The application logic should use getters:
public class Contact {
private String firstName;
private String lastName;
public Contact (String firstName, String lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
public String getFirstName() {return firstName;}
public String getLastName() {return lastName;}
public String getContact() {
return firstName + " " + lastName;
}
@Override
public String toString() {
return "["+getContact()+"]";
}
}
In app\Exceptions\Handler.php
protected function unauthenticated($request, AuthenticationException $exception)
{
if ($request->expectsJson()) {
return response()->json(['error' => 'Unauthenticated.'], 401);
}
return redirect()->guest(route('auth.login'));
}
- Can someone give a simple definition of what
Record
is?
A Record<K, T>
is an object type whose property keys are K
and whose property values are T
. That is, keyof Record<K, T>
is equivalent to K
, and Record<K, T>[K]
is (basically) equivalent to T
.
- Is
Record<K,T>
merely a way of saying "all properties on this object will have typeT
"? Probably not all objects, sinceK
has some purpose...
As you note, K
has a purpose... to limit the property keys to particular values. If you want to accept all possible string-valued keys, you could do something like Record<string, T>
, but the idiomatic way of doing that is to use an index signature like { [k: string]: T }
.
- Does the
K
generic forbid additional keys on the object that are notK
, or does it allow them and just indicate that their properties are not transformed toT
?
It doesn't exactly "forbid" additional keys: after all, a value is generally allowed to have properties not explicitly mentioned in its type... but it wouldn't recognize that such properties exist:
declare const x: Record<"a", string>;
x.b; // error, Property 'b' does not exist on type 'Record<"a", string>'
and it would treat them as excess properties which are sometimes rejected:
declare function acceptR(x: Record<"a", string>): void;
acceptR({a: "hey", b: "you"}); // error, Object literal may only specify known properties
and sometimes accepted:
const y = {a: "hey", b: "you"};
acceptR(y); // okay
With the given example:
type ThreeStringProps = Record<'prop1' | 'prop2' | 'prop3', string>
Is it exactly the same as this?:
type ThreeStringProps = {prop1: string, prop2: string, prop3: string}
Yes!
Hope that helps. Good luck!
app.use
is a function requires middleware. For example:
app.use('/user/:id', function (req, res, next) {
console.log('Request Type:', req.method);
next();
});
This example shows the middleware function installed in the /user/:id
path. This function is executed for any type of HTTP request in the /user/:id
path.
It is similar to the REST Web Server, just use different /xx
to represent different actions.
The importance of secure defaults in frameworks and APIs:
To find a hostname in your local network by IP address you can use:
nmblookup -A <ip>
To find a hostname on the internet you could use the host
program:
host <ip>
Or you can install nbtscan
by running:
sudo apt-get install nbtscan
And use:
nbtscan <ip>
Update 2018-05-13
You can query a name server with nslookup
. It works both ways!
nslookup <IP>
nslookup <hostname>
Are you find with using standard tooltip? You could use title attribute like
<label for="male" title="Hello This Will Have Some Value">Hello...</label>
You could add the title attribute of same value to the element that label is for as well.
Node.js is based on the event loop programming model. The event loop runs in single thread and repeatedly waits for events and then runs any event handlers subscribed to those events. Events can be for example
All of this runs in single thread and no JavaScript code is ever executed in parallel. As long as these event handlers are small and wait for yet more events themselves everything works out nicely. This allows multiple request to be handled concurrently by a single Node.js process.
(There's a little bit magic under the hood as where the events originate. Some of it involve low level worker threads running in parallel.)
In this SQL case, there's a lot of things (events) happening between making the database query and getting its results in the callback. During that time the event loop keeps pumping life into the application and advancing other requests one tiny event at a time. Therefore multiple requests are being served concurrently.
According to: "Event loop from 10,000ft - core concept behind Node.js".
If you want to modify only the first commit, you may try git rebase and amend the commit, which is similar to this post: How to modify a specified commit in git?
And if you want to modify all the commits which contain the raw email, filter-branch is the best choice. There is an example of how to change email address globally on the book Pro Git, and you may find this link useful http://git-scm.com/book/en/Git-Tools-Rewriting-History
A few things I've noted:
For more information (and a great usage example) refer to the LunarLander project in the SDK 's examples section.
no need for the padding or the corners.
here's a sample:
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="oval" >
<gradient android:startColor="#FFFF0000" android:endColor="#80FF00FF"
android:angle="270"/>
</shape>
based on :
If you've recently updated, a reboot might solve this problem.
Perhaps create a shared Fruit
interface that provides isDecayed. fruits
is now of type Fruit[]
so the type can be explicit. Like this:
interface Fruit {
isDecayed: boolean;
}
interface Apple extends Fruit {
color: string;
}
interface Pear extends Fruit {
weight: number;
}
interface FruitBasket {
apples: Apple[];
pears: Pear[];
}
const fruitBasket: FruitBasket = { apples: [], pears: [] };
const key: keyof FruitBasket = Math.random() > 0.5 ? 'apples': 'pears';
const fruits: Fruit[] = fruitBasket[key];
const freshFruits = fruits.filter((fruit) => !fruit.isDecayed);
((http?|https|ftp|file)://)?((W|w){3}.)?[a-zA-Z0-9]+\.[a-zA-Z]+
check here:- https://www.freeformatter.com/java-regex-tester.html#ad-output
It sorts out theses entries correctly
You may try this one
$this->db->where('field1',$filed1);
$this->db->where('filed2',$filed2);
$result = $this->db->get('table_name')->num_rows();
The provided Answers did not solve my problem,
It did not:
My script does, see.
<?php function unset_cookie($name)
{
$host = $_SERVER['HTTP_HOST'];
$domain = explode(':', $host)[0];
$uri = $_SERVER['REQUEST_URI'];
$uri = rtrim(explode('?', $uri)[0], '/');
if ($uri && !filter_var('file://' . $uri, FILTER_VALIDATE_URL)) {
throw new Exception('invalid uri: ' . $uri);
}
$parts = explode('/', $uri);
$cookiePath = '';
foreach ($parts as $part) {
$cookiePath = '/'.ltrim($cookiePath.'/'.$part, '//');
setcookie($name, '', 1, $cookiePath);
$_domain = $domain;
do {
setcookie($name, '', 1, $cookiePath, $_domain);
} while (strpos($_domain, '.') !== false && $_domain = substr($_domain, 1 + strpos($_domain, '.')));
}
}
It is not the most pretty/safe/optimal solution, so use this only if you do not known the cookie-path and/or cookie-domain's. Or use the idea in order to create your version.
There's also Michael Kaplan's SOON ("Shut One, Open New") add-in. You'd have to chain it, but it's one way to do this.
I can't say I've had much reason to ever want to do this programatically, since I'm programming for end users, and they are never using anything but the front end in the Access user interface, and there's no reason to regularly compact a properly-designed front end.
Changing the registry worked for me.
If its helpful to anyone, I initially prefixed "z_" to the entries in "ShellIconOverlayIdentifiers" that I wanted to move down. However that didn't seem to bring up the TortoiseSVN entries. It might be due to case sensitivity wherein lowercase "z" still precedes uppercase "T". Finally, prefixing with "Z_" instead did the trick.
The Structure101 slice perspective will give a list (and dependency graph) of any "orphans" or "orphan groups" of classes or packages that have no dependencies to or from the "main" cluster.
coalesce
is supported in both Oracle and SQL Server and serves essentially the same function as nvl
and isnull
. (There are some important differences, coalesce
can take an arbitrary number of arguments, and returns the first non-null one. The return type for isnull
matches the type of the first argument, that is not true for coalesce
, at least on SQL Server.)
Here's a nice way to get the checked radio button's value with plain JavaScript:
const form = document.forms.demo;
const checked = form.querySelector('input[name=characters]:checked');
// log out the value from the :checked radio
console.log(checked.value);
Source: https://ultimatecourses.com/blog/get-value-checked-radio-buttons
Using this HTML:
<form name="demo">
<label>
Mario
<input type="radio" value="mario" name="characters" checked>
</label>
<label>
Luigi
<input type="radio" value="luigi" name="characters">
</label>
<label>
Toad
<input type="radio" value="toad" name="characters">
</label>
</form>
You could also use Array Find the checked
property to find the checked item:
Array.from(form.elements.characters).find(radio => radio.checked);
Ok solved it.
Added the solution to GitHub - http://gregorypratt.github.com/AngularDynamicRouting
In my app.js routing config:
$routeProvider.when('/pages/:name', {
templateUrl: '/pages/home.html',
controller: CMSController
});
Then in my CMS controller:
function CMSController($scope, $route, $routeParams) {
$route.current.templateUrl = '/pages/' + $routeParams.name + ".html";
$.get($route.current.templateUrl, function (data) {
$scope.$apply(function () {
$('#views').html($compile(data)($scope));
});
});
...
}
CMSController.$inject = ['$scope', '$route', '$routeParams'];
With #views being my <div id="views" ng-view></div>
So now it works with standard routing and dynamic routing.
To test it I copied about.html called it portfolio.html, changed some of it's contents and entered /#/pages/portfolio
into my browser and hey presto portfolio.html was displayed....
Updated Added $apply and $compile to the html so that dynamic content can be injected.
Here is good Demo in Fiddle how to use shared service in directive and other controllers through $scope.$on
HTML
<div ng-controller="ControllerZero">
<input ng-model="message" >
<button ng-click="handleClick(message);">BROADCAST</button>
</div>
<div ng-controller="ControllerOne">
<input ng-model="message" >
</div>
<div ng-controller="ControllerTwo">
<input ng-model="message" >
</div>
<my-component ng-model="message"></my-component>
JS
var myModule = angular.module('myModule', []);
myModule.factory('mySharedService', function($rootScope) {
var sharedService = {};
sharedService.message = '';
sharedService.prepForBroadcast = function(msg) {
this.message = msg;
this.broadcastItem();
};
sharedService.broadcastItem = function() {
$rootScope.$broadcast('handleBroadcast');
};
return sharedService;
});
By the same way we can use shared service in directive. We can implement controller section into directive and use $scope.$on
myModule.directive('myComponent', function(mySharedService) {
return {
restrict: 'E',
controller: function($scope, $attrs, mySharedService) {
$scope.$on('handleBroadcast', function() {
$scope.message = 'Directive: ' + mySharedService.message;
});
},
replace: true,
template: '<input>'
};
});
And here three our controllers where ControllerZero
used as trigger to invoke prepForBroadcast
function ControllerZero($scope, sharedService) {
$scope.handleClick = function(msg) {
sharedService.prepForBroadcast(msg);
};
$scope.$on('handleBroadcast', function() {
$scope.message = sharedService.message;
});
}
function ControllerOne($scope, sharedService) {
$scope.$on('handleBroadcast', function() {
$scope.message = 'ONE: ' + sharedService.message;
});
}
function ControllerTwo($scope, sharedService) {
$scope.$on('handleBroadcast', function() {
$scope.message = 'TWO: ' + sharedService.message;
});
}
The ControllerOne
and ControllerTwo
listen message
change by using $scope.$on
handler.
I hope this comment will help you to find out your local & server file path using terminal
find "$(cd ..; pwd)" -name "filename"
Or just you want to see your Current location then run
pwd "filename"
PHP does not do styling. You need to use html or css. Take a look at http://www.w3schools.com/tags/tag_hr.asp
In HTML 4.01, the
In HTML 4.01, the <hr> tag represents a horizontal rule.
I had to write a simple script for a carousel to detect swipe left or right.
I utilised Pointer Events instead of Touch Events.
I hope this is useful to individuals and I welcome any insights to improve my code; I feel rather sheepish to join this thread with significantly superior JS developers.
function getSwipeX({elementId}) {
this.e = document.getElementsByClassName(elementId)[0];
this.initialPosition = 0;
this.lastPosition = 0;
this.threshold = 200;
this.diffInPosition = null;
this.diffVsThreshold = null;
this.gestureState = 0;
this.getTouchStart = (event) => {
event.preventDefault();
if (window.PointerEvent) {
this.e.setPointerCapture(event.pointerId);
}
return this.initalTouchPos = this.getGesturePoint(event);
}
this.getTouchMove = (event) => {
event.preventDefault();
return this.lastPosition = this.getGesturePoint(event);
}
this.getTouchEnd = (event) => {
event.preventDefault();
if (window.PointerEvent) {
this.e.releasePointerCapture(event.pointerId);
}
this.doSomething();
this.initialPosition = 0;
}
this.getGesturePoint = (event) => {
this.point = event.pageX
return this.point;
}
this.whatGestureDirection = (event) => {
this.diffInPosition = this.initalTouchPos - this.lastPosition;
this.diffVsThreshold = Math.abs(this.diffInPosition) > this.threshold;
(Math.sign(this.diffInPosition) > 0) ? this.gestureState = 'L' : (Math.sign(this.diffInPosition) < 0) ? this.gestureState = 'R' : this.gestureState = 'N';
return [this.diffInPosition, this.diffVsThreshold, this.gestureState];
}
this.doSomething = (event) => {
let [gestureDelta,gestureThreshold,gestureDirection] = this.whatGestureDirection();
// USE THIS TO DEBUG
console.log(gestureDelta,gestureThreshold,gestureDirection);
if (gestureThreshold) {
(gestureDirection == 'L') ? // LEFT ACTION : // RIGHT ACTION
}
}
if (window.PointerEvent) {
this.e.addEventListener('pointerdown', this.getTouchStart, true);
this.e.addEventListener('pointermove', this.getTouchMove, true);
this.e.addEventListener('pointerup', this.getTouchEnd, true);
this.e.addEventListener('pointercancel', this.getTouchEnd, true);
}
}
You can call the function using new.
window.addEventListener('load', () => {
let test = new getSwipeX({
elementId: 'your_div_here'
});
})
I find it useful to have a class, derived from threading.Thread
, to encapsulate my thread functionality. You simply provide your own main loop in an overridden version of run()
in this class. Calling start()
arranges for the object’s run()
method to be invoked in a separate thread.
Inside the main loop, periodically check whether a threading.Event
has been set. Such an event is thread-safe.
Inside this class, you have your own join()
method that sets the stop event object before calling the join()
method of the base class. It can optionally take a time value to pass to the base class's join()
method to ensure your thread is terminated in a short amount of time.
import threading
import time
class MyThread(threading.Thread):
def __init__(self, sleep_time=0.1):
self._stop_event = threading.Event()
self._sleep_time = sleep_time
"""call base class constructor"""
super().__init__()
def run(self):
"""main control loop"""
while not self._stop_event.isSet():
#do work
print("hi")
self._stop_event.wait(self._sleep_time)
def join(self, timeout=None):
"""set stop event and join within a given time period"""
self._stop_event.set()
super().join(timeout)
if __name__ == "__main__":
t = MyThread()
t.start()
time.sleep(5)
t.join(1) #wait 1s max
Having a small sleep inside the main loop before checking the threading.Event
is less CPU intensive than looping continuously. You can have a default sleep time (e.g. 0.1s), but you can also pass the value in the constructor.
Hey I got something that seems to be doing what you want a do. It involves some dirty copying but works. You can find the working code here
So here is the main html file :
<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
Iframe = $('#frame1');
Iframe.on('load', function(){
IframeInner = Iframe.contents().find('iframe');
IframeInnerClone = IframeInner.clone();
IframeInnerClone.insertAfter($('#insertIframeAfter')).css({display:'none'});
IframeInnerClone.on('load', function(){
IframeContents = IframeInner.contents();
YourNestedEl = IframeContents.find('div');
$('<div>Yeepi! I can even insert stuff!</div>').insertAfter(YourNestedEl)
});
});
});
</script>
</head>
<body>
<div id="insertIframeAfter">Hello!!!!</div>
<iframe id="frame1" src="Test_Iframe.html">
</iframe>
</body>
</html>
As you can see, once the first Iframe is loaded, I get the second one and clone it. I then reinsert it in the dom, so I can get access to the onload event. Once this one is loaded, I retrieve the content from non-cloned one (must have loaded as well, since they use the same src). You can then do wathever you want with the content.
Here is the Test_Iframe.html file :
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<div>Test_Iframe</div>
<iframe src="Test_Iframe2.html">
</iframe>
</body>
</html>
and the Test_Iframe2.html file :
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<div>I am the second nested iframe</div>
</body>
</html>
Maven uses batch files to do its business. With any batch script, you must call another script using the call
command so it knows to return back to your script after the called script completes. Try prepending call
to all commands.
Another thing you could try is using the start
command which should work similarly.
Add the JSON MIME type to IIS 6. Follow the directions at MSDN's Configure MIME Types (IIS 6.0).
Don't forget to restart IIS after the change.
UPDATE: There are easy ways to do this on IIS7 and newer. The op specifically asked for IIS6 help so I'm leaving this answer as-is. But this answer is still getting a lot of traffic even though IIS6 is very old now. Hopefully you're using something newer, so I wanted to mention that if you have a newer IIS7 or newer version see @ProVega's answer below for a simpler solution for those newer versions.
Technically redirect should be used either if we need to transfer control to different domain or to achieve separation of task.
For example in the payment application we do the PaymentProcess first and then redirect to displayPaymentInfo. If the client refreshes the browser only the displayPaymentInfo will be done again and PaymentProcess will not be repeated. But if we use forward in this scenario, both PaymentProcess and displayPaymentInfo will be re-executed sequentially, which may result in incosistent data.
For other scenarios, forward is efficient to use since as it is faster than sendRedirect
Different web servers implement different techniques for handling incoming HTTP requests in parallel. A pretty popular technique is using threads -- that is, the web server will create/dedicate a single thread for each incoming request. The Apache HTTP web server supports multiple models for handling requests, one of which (called the worker MPM) uses threads. But it supports another concurrency model called the prefork MPM which uses processes -- that is, the web server will create/dedicate a single process for each request.
There are also other completely different concurrency models (using Asynchronous sockets and I/O), as well as ones that mix two or even three models together. For the purpose of answering this question, we are only concerned with the two models above, and taking Apache HTTP server as an example.
PHP itself does not respond to the actual HTTP requests -- this is the job of the web server. So we configure the web server to forward requests to PHP for processing, then receive the result and send it back to the user. There are multiple ways to chain the web server with PHP. For Apache HTTP Server, the most popular is "mod_php". This module is actually PHP itself, but compiled as a module for the web server, and so it gets loaded right inside it.
There are other methods for chaining PHP with Apache and other web servers, but mod_php is the most popular one and will also serve for answering your question.
You may not have needed to understand these details before, because hosting companies and GNU/Linux distros come with everything prepared for us.
Since with mod_php, PHP gets loaded right into Apache, if Apache is going to handle concurrency using its Worker MPM (that is, using Threads) then PHP must be able to operate within this same multi-threaded environment -- meaning, PHP has to be thread-safe to be able to play ball correctly with Apache!
At this point, you should be thinking "OK, so if I'm using a multi-threaded web server and I'm going to embed PHP right into it, then I must use the thread-safe version of PHP". And this would be correct thinking. However, as it happens, PHP's thread-safety is highly disputed. It's a use-if-you-really-really-know-what-you-are-doing ground.
In case you are wondering, my personal advice would be to not use PHP in a multi-threaded environment if you have the choice!
Speaking only of Unix-based environments, I'd say that fortunately, you only have to think of this if you are going to use PHP with Apache web server, in which case you are advised to go with the prefork MPM of Apache (which doesn't use threads, and therefore, PHP thread-safety doesn't matter) and all GNU/Linux distributions that I know of will take that decision for you when you are installing Apache + PHP through their package system, without even prompting you for a choice. If you are going to use other webservers such as nginx or lighttpd, you won't have the option to embed PHP into them anyway. You will be looking at using FastCGI or something equal which works in a different model where PHP is totally outside of the web server with multiple PHP processes used for answering requests through e.g. FastCGI. For such cases, thread-safety also doesn't matter. To see which version your website is using put a file containing <?php phpinfo(); ?>
on your site and look for the Server API
entry. This could say something like CGI/FastCGI
or Apache 2.0 Handler
.
If you also look at the command-line version of PHP -- thread safety does not matter.
Finally, if thread-safety doesn't matter so which version should you use -- the thread-safe or the non-thread-safe? Frankly, I don't have a scientific answer! But I'd guess that the non-thread-safe version is faster and/or less buggy, or otherwise they would have just offered the thread-safe version and not bothered to give us the choice!
gdb disassemble has a /m to include source code alongside the instructions. This is equivalent of objdump -S, with the extra benefit of confining to just the one function (or address-range) of interest.