Programs & Examples On #Integrated pipeline mode

"This operation requires IIS integrated pipeline mode."

The way to fix this issue is not within IIS. I was trying to run my application within IIS Express within Visual Studio. I searched the web and some articles were saying to add an identity tag to the system.web tag. This is not the correct way.

The way I was able to solve this issue was to click on the project file and go to properties. Under managed pipeline, I changed the property value from classic to integrated.

This solved my issue.

What is the difference between 'classic' and 'integrated' pipeline mode in IIS7?

Integrated application pool mode

When an application pool is in Integrated mode, you can take advantage of the integrated request-processing architecture of IIS and ASP.NET. When a worker process in an application pool receives a request, the request passes through an ordered list of events. Each event calls the necessary native and managed modules to process portions of the request and to generate the response.

There are several benefits to running application pools in Integrated mode. First the request-processing models of IIS and ASP.NET are integrated into a unified process model. This model eliminates steps that were previously duplicated in IIS and ASP.NET, such as authentication. Additionally, Integrated mode enables the availability of managed features to all content types.

Classic application pool mode

When an application pool is in Classic mode, IIS 7.0 handles requests as in IIS 6.0 worker process isolation mode. ASP.NET requests first go through native processing steps in IIS and are then routed to Aspnet_isapi.dll for processing of managed code in the managed runtime. Finally, the request is routed back through IIS to send the response.

This separation of the IIS and ASP.NET request-processing models results in duplication of some processing steps, such as authentication and authorization. Additionally, managed code features, such as forms authentication, are only available to ASP.NET applications or applications for which you have script mapped all requests to be handled by aspnet_isapi.dll.

Be sure to test your existing applications for compatibility in Integrated mode before upgrading a production environment to IIS 7.0 and assigning applications to application pools in Integrated mode. You should only add an application to an application pool in Classic mode if the application fails to work in Integrated mode. For example, your application might rely on an authentication token passed from IIS to the managed runtime, and, due to the new architecture in IIS 7.0, the process breaks your application.

Taken from: What is the difference between DefaultAppPool and Classic .NET AppPool in IIS7?

Original source: Introduction to IIS Architecture

Move branch pointer to different commit without checkout

Open the file .git/refs/heads/<your_branch_name>, and change the hash stored there to the one where you want to move the head of your branch. Just edit and save the file with any text editor. Just make sure that the branch to modify is not the current active one.

Disclaimer: Probably not an advisable way to do it, but gets the job done.

PHP header() redirect with POST variables

Use a smarty template for your stuff then just set the POST array as a smarty array and open the template. In the template just echo out the array so if it passes:

if(correct){
    header("Location: passed.php");
} else {
    $smarty->assign("variables", $_POST);
    $smarty->display("register_error.php");
    exit;
}

I have not tried this yet but I am going to try it as a solution and will let you know what I find. But of course this method assumes that you are using smarty.

If not you can just recreate your form there on the error page and echo info into the form or you could send back non important data in a get from and get it

ex.

register.php?name=mr_jones&address==......
echo $_GET[name];

When is layoutSubviews called?

A rather obscure, yet potentially important case when layoutSubviews never gets called is:

import UIKit

class View: UIView {

    override class var layerClass: AnyClass { return Layer.self }

    class Layer: CALayer {
        override func layoutSublayers() {
            // if we don't call super.layoutSublayers()...
            print(type(of: self), #function)
        }
    }

    override func layoutSubviews() {
        // ... this method never gets called by the OS!
        print(type(of: self), #function)
    }
}

let view = View(frame: CGRect(x: 0, y: 0, width: 100, height: 100))

Can I use library that used android support with Androidx projects.

I had a problem like this before, it was the gradle.properties file doesn't exist, only the gradle.properties.txt , so i went to my project folder and i copied & pasted the gradle.properties.txt file but without .txt extension then it finally worked.

Scraping html tables into R data frames using the XML package

library(RCurl)
library(XML)

# Download page using RCurl
# You may need to set proxy details, etc.,  in the call to getURL
theurl <- "http://en.wikipedia.org/wiki/Brazil_national_football_team"
webpage <- getURL(theurl)
# Process escape characters
webpage <- readLines(tc <- textConnection(webpage)); close(tc)

# Parse the html tree, ignoring errors on the page
pagetree <- htmlTreeParse(webpage, error=function(...){})

# Navigate your way through the tree. It may be possible to do this more efficiently using getNodeSet
body <- pagetree$children$html$children$body 
divbodyContent <- body$children$div$children[[1]]$children$div$children[[4]]
tables <- divbodyContent$children[names(divbodyContent)=="table"]

#In this case, the required table is the only one with class "wikitable sortable"  
tableclasses <- sapply(tables, function(x) x$attributes["class"])
thetable  <- tables[which(tableclasses=="wikitable sortable")]$table

#Get columns headers
headers <- thetable$children[[1]]$children
columnnames <- unname(sapply(headers, function(x) x$children$text$value))

# Get rows from table
content <- c()
for(i in 2:length(thetable$children))
{
   tablerow <- thetable$children[[i]]$children
   opponent <- tablerow[[1]]$children[[2]]$children$text$value
   others <- unname(sapply(tablerow[-1], function(x) x$children$text$value)) 
   content <- rbind(content, c(opponent, others))
}

# Convert to data frame
colnames(content) <- columnnames
as.data.frame(content)

Edited to add:

Sample output

                     Opponent Played Won Drawn Lost Goals for Goals against  % Won
    1               Argentina     94  36    24   34       148           150  38.3%
    2                Paraguay     72  44    17   11       160            61  61.1%
    3                 Uruguay     72  33    19   20       127            93  45.8%
    ...

How to check if an environment variable exists and get its value?

[ -z "${DEPLOY_ENV}" ] checks whether DEPLOY_ENV has length equal to zero. So you could run:

if [[ -z "${DEPLOY_ENV}" ]]; then
  MY_SCRIPT_VARIABLE="Some default value because DEPLOY_ENV is undefined"
else
  MY_SCRIPT_VARIABLE="${DEPLOY_ENV}"
fi

# or using a short-hand version

[[ -z "${DEPLOY_ENV}" ]] && MyVar='default' || MyVar="${DEPLOY_ENV}"

# or even shorter use

MyVar="${DEPLOY_ENV:-default_value}"

How can I get a file's size in C++?

#include <stdio.h>

#define MAXNUMBER 1024

int main()
{
    int i;
    char a[MAXNUMBER];

    FILE *fp = popen("du -b  /bin/bash", "r");

    while((a[i++] = getc(fp))!= 9)
        ;

    a[i] ='\0';

    printf(" a is %s\n", a);

    pclose(fp);
    return 0;
}  

HTH

is there any alternative for ng-disabled in angular2?

Here is a solution am using with anular 6.

[readonly]="DateRelatedObject.bool_DatesEdit ? true : false"

plus above given answer

[attr.disabled]="valid == true ? true : null"

did't work for me plus be aware of using null cause it's expecting bool.

Python find min max and average of a list (array)

Return min and max value in tuple:

def side_values(num_list):
    results_list = sorted(num_list)
    return results_list[0], results_list[-1]


somelist = side_values([1,12,2,53,23,6,17])
print(somelist)

How do you do a deep copy of an object in .NET?

Maybe you only need a shallow copy, in that case use Object.MemberWiseClone().

There are good recommendations in the documentation for MemberWiseClone() for strategies to deep copy: -

http://msdn.microsoft.com/en-us/library/system.object.memberwiseclone.aspx

What is the total amount of public IPv4 addresses?

Public IP Addresses

https://github.com/stephenlb/geo-ip will generate a list of Valid IP Public Addresses including Localities.

'1.0.0.0/8' to '191.0.0.0/8' are the valid public IP Address range exclusive of the reserved Private IP Addresses as follows:

import iptools
## Private IP Addresses
private_ips = iptools.IpRangeList(
    '0.0.0.0/8',      '10.0.0.0/8',     '100.64.0.0/10', '127.0.0.0/8',
    '169.254.0.0/16', '172.16.0.0/12',  '192.0.0.0/24',  '192.0.2.0/24',
    '192.88.99.0/24', '192.168.0.0/16', '198.18.0.0/15', '198.51.100.0/24',
    '203.0.113.0/24', '224.0.0.0/4',    '240.0.0.0/4',   '255.255.255.255/32'
)

IP Generator

Generates a JSON dump of IP Addresses and associated Geo information. Note that the valid public IP Address range is from '1.0.0.0/8' to '191.0.0.0/8' excluding the reserved Private IP Address ranges shown lower down in this readme.

docker build -t geo-ip .
docker run -e IPRANGE='54.0.0.0/30' geo-ip               ## a few IPs
docker run -e IPRANGE='54.0.0.0/26' geo-ip               ## a few more IPs
docker run -e IPRANGE='54.0.0.0/16' geo-ip               ## a lot more IPs
docker run -e IPRANGE='0.0.0.0/0'   geo-ip               ## ALL IPs ( slooooowwwwww )
docker run -e IPRANGE='0.0.0.0/0'   geo-ip > geo-ip.json ## ALL IPs saved to JSON File
docker run geo-ip 

A little faster option for scanning all valid public addresses:

for i in $(seq 1 191); do \
    docker run -e IPRANGE="$i.0.0.0/8" geo-ip; \
    sleep 1; \ 
done

This prints less than 4,228,250,625 JSON lines to STDOUT. Here is an example of one of the lines:

{"city": "Palo Alto", "ip": "0.0.0.0", "longitude": -122.1274,
 "continent": "North America", "continent_code": "NA",
 "state": "California", "country": "United States", "latitude": 37.418,
 "iso_code": "US", "state_code": "CA", "aso": "PubNub",
 "asn": "11404", "zip_code": "94107"}

Private and Reserved IP Range

The dockerfile in the repo above will exclude non-usable IP addresses following the guide from the wikipedia article: https://en.wikipedia.org/wiki/Reserved_IP_addresses

MaxMind Geo IP

The dockerfile imports a free public Database provided by https://www.maxmind.com/en/home

Byte[] to ASCII

As an alternative to reading a data from a stream to a byte array, you could let the framework handle everything and just use a StreamReader set up with an ASCII encoding to read in the string. That way you don't need to worry about getting the appropriate buffer size or larger data sizes.

using (var reader = new StreamReader(stream, Encoding.ASCII))
{
    string theString = reader.ReadToEnd();
    // do something with theString
}

how to include glyphicons in bootstrap 3

I think your particular problem isn't how to use Glyphicons but understanding how Bootstrap files work together.

Bootstrap requires a specific file structure to work. I see from your code you have this:

<link href="bootstrap.css" rel="stylesheet" media="screen">

Your Bootstrap.css is being loaded from the same location as your page, this would create a problem if you didn't adjust your file structure.

But first, let me recommend you setup your folder structure like so:

/css      <-- Bootstrap.css here
/fonts    <-- Bootstrap fonts here
/img
/js       <-- Bootstrap JavaScript here
index.html

If you notice, this is also how Bootstrap structures its files in its download ZIP.

You then include your Bootstrap file like so:

<link href="css/bootstrap.css" rel="stylesheet" media="screen">
or
<link href="./css/bootstrap.css" rel="stylesheet" media="screen">
or
<link href="/css/bootstrap.css" rel="stylesheet" media="screen">

Depending on your server structure or what you're going for.

The first and second are relative to your file's current directory. The second one is just more explicit by saying "here" (./) first then css folder (/css).

The third is good if you're running a web server, and you can just use relative to root notation as the leading "/" will be always start at the root folder.

So, why do this?

Bootstrap.css has this specific line for Glyphfonts:

@font-face {
    font-family: 'Glyphicons Halflings';
    src: url('../fonts/glyphicons-halflings-regular.eot');
    src: url('../fonts/glyphicons-halflings-regular.eot?#iefix') format('embedded-opentype'), url('../fonts/glyphicons-halflings-regular.woff') format('woff'), url('../fonts/glyphicons-halflings-regular.ttf') format('truetype'), url('../fonts/glyphicons-halflings-regular.svg#glyphicons-halflingsregular') format('svg');
}

What you can see is that that Glyphfonts are loaded by going up one directory ../ and then looking for a folder called /fonts and THEN loading the font file.

The URL address is relative to the location of the CSS file. So, if your CSS file is at the same location like this:

/fonts
Bootstrap.css
index.html

The CSS file is going one level deeper than looking for a /fonts folder.

So, let's say the actual location of these files are:

C:\www\fonts
C:\www\Boostrap.css
C:\www\index.html

The CSS file would technically be looking for a folder at:

C:\fonts

but your folder is actually in:

C:\www\fonts

So see if that helps. You don't have to do anything 'special' to load Bootstrap Glyphicons, except make sure your folder structure is set up appropriately.

When you get that fixed, your HTML should simply be:

<span class="glyphicon glyphicon-comment"></span>

Note, you need both classes. The first class glyphicon sets up the basic styles while glyphicon-comment sets the specific image.

C# get string from textbox

In C#, unlike java we do not have to use any method. TextBox property Text is used to get or set its text.

Get

string username = txtusername.Text;
string password = txtpassword.Text;

Set

txtusername.Text = "my_username";
txtpassword.Text = "12345";

JBoss AS 7: How to clean up tmp?

I do not have experience with version 7 of JBoss but with 5 I often had issues when redeploying apps which went away when I cleaned the work and tmp folder. I wrote a script for that which was executed everytime the server shut down. Maybe executing it before startup is better considering abnormal shutdowns (which weren't uncommon with Jboss 5 :))

Python string class like StringBuilder in C#?

In case you are here looking for a fast string concatenation method in Python, then you do not need a special StringBuilder class. Simple concatenation works just as well without the performance penalty seen in C#.

resultString = ""

resultString += "Append 1"
resultString += "Append 2"

See Antoine-tran's answer for performance results

Need help rounding to 2 decimal places

The problem will be that you cannot represent 0.575 exactly as a binary floating point number (eg a double). Though I don't know exactly it seems that the representation closest is probably just a bit lower and so when rounding it uses the true representation and rounds down.

If you want to avoid this problem then use a more appropriate data type. decimal will do what you want:

Math.Round(0.575M, 2, MidpointRounding.AwayFromZero)

Result: 0.58

The reason that 0.75 does the right thing is that it is easy to represent in binary floating point since it is simple 1/2 + 1/4 (ie 2^-1 +2^-2). In general any finite sum of powers of two can be represented in binary floating point. Exceptions are when your powers of 2 span too great a range (eg 2^100+2 is not exactly representable).

Edit to add:

Formatting doubles for output in C# might be of interest in terms of understanding why its so hard to understand that 0.575 is not really 0.575. The DoubleConverter in the accepted answer will show that 0.575 as an Exact String is 0.5749999999999999555910790149937383830547332763671875 You can see from this why rounding give 0.57.

Ruby function to remove all white spaces?

For behavior exactly matching PHP trim, the simplest method is to use the String#strip method, like so:

string = "  Many have tried; many have failed!    "
puts "Original [#{string}]:#{string.length}"
new_string = string.strip
puts "Updated  [#{new_string}]:#{new_string.length}"

Ruby also has an edit-in-place version, as well, called String.strip! (note the trailing '!'). This doesn't require creating a copy of the string, and can be significantly faster for some uses:

string = "  Many have tried; many have failed!    "
puts "Original [#{string}]:#{string.length}"
string.strip!
puts "Updated  [#{string}]:#{string.length}"

Both versions produce this output:

Original [  Many have tried; many have failed!    ]:40
Updated  [Many have tried; many have failed!]:34

I created a benchmark to test the performance of some basic uses of strip and strip!, as well as some alternatives. The test is this:

require 'benchmark'

string = 'asdfghjkl'
Times = 25_000

a = Times.times.map {|n| spaces = ' ' * (1+n/4); "#{spaces}#{spaces}#{string}#{spaces}" }
b = Times.times.map {|n| spaces = ' ' * (1+n/4); "#{spaces}#{spaces}#{string}#{spaces}" }
c = Times.times.map {|n| spaces = ' ' * (1+n/4); "#{spaces}#{spaces}#{string}#{spaces}" }
d = Times.times.map {|n| spaces = ' ' * (1+n/4); "#{spaces}#{spaces}#{string}#{spaces}" }

puts RUBY_DESCRIPTION
puts "============================================================"
puts "Running tests for trimming strings"

Benchmark.bm(20) do |x|
  x.report("s.strip:")                 { a.each {|s| s = s.strip } }
  x.report("s.rstrip.lstrip:")         { a.each {|s| s = s.rstrip.lstrip } }
  x.report("s.gsub:")                  { a.each {|s| s = s.gsub(/^\s+|\s+$/, "") } }
  x.report("s.sub.sub:")               { a.each {|s| s = s.sub(/^\s+/, "").sub(/\s+$/, "") } }

  x.report("s.strip!")                 { a.each {|s| s.strip! } }
  x.report("s.rstrip!.lstrip!:")       { b.each {|s| s.rstrip! ; s.lstrip! } }
  x.report("s.gsub!:")                 { c.each {|s| s.gsub!(/^\s+|\s+$/, "") } }
  x.report("s.sub!.sub!:")             { d.each {|s| s.sub!(/^\s+/, "") ; s.sub!(/\s+$/, "") } }
end

These are the results:

ruby 2.2.5p319 (2016-04-26 revision 54774) [x86_64-darwin14]
============================================================
Running tests for trimming strings
                           user     system      total        real
s.strip:               2.690000   0.320000   3.010000 (  4.048079)
s.rstrip.lstrip:       2.790000   0.060000   2.850000 (  3.110281)
s.gsub:               13.060000   5.800000  18.860000 ( 19.264533)
s.sub.sub:             9.880000   4.910000  14.790000 ( 14.945006)
s.strip!               2.750000   0.080000   2.830000 (  2.960402)
s.rstrip!.lstrip!:     2.670000   0.320000   2.990000 (  3.221094)
s.gsub!:              13.410000   6.490000  19.900000 ( 20.392547)
s.sub!.sub!:          10.260000   5.680000  15.940000 ( 16.411131)

How to get SLF4J "Hello World" working with log4j?

Following is an example. You can see the details http://jkssweetlife.com/configure-slf4j-working-various-logging-frameworks/ and download the full codes here.

  • Add following dependency to your pom if you are using maven, otherwise, just download the jar files and put on your classpath

    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.7.7</version>
    </dependency>
    
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.7.7</version>
    </dependency>
    
  • Configure log4j.properties

    log4j.rootLogger=TRACE, stdout
    log4j.appender.stdout=org.apache.log4j.ConsoleAppender
    log4j.appender.stdout.Target=System.out
    log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
    log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd'T'HH:mm:ss.SSS} %-5p [%c] - %m%n
    
  • Java example

    public class Slf4jExample {
        public static void main(String[] args) {
    
            Logger logger = LoggerFactory.getLogger(Slf4jExample.class);
    
            final String message = "Hello logging!";
            logger.trace(message);
            logger.debug(message);
            logger.info(message);
            logger.warn(message);
            logger.error(message);
        }
    }
    

mysql select from n last rows

Might be a very late answer, but this is good and simple.

select * from table_name order by id desc limit 5

This query will return a set of last 5 values(last 5 rows) you 've inserted in your table

A Simple, 2d cross-platform graphics library for c or c++?

One neat engine I came across is Angel-Engine. Info from the project site:

  • Cross-Platform functionality (Windows and Mac)
  • Actors (game objects with color, shape, responses, attributes, etc.)
  • Texturing with Transparency
  • "Animations" (texture swapping at defined intervals)
  • Rigid-Body Physics
    • A clever programmer can do soft-body physics with it
  • Sound
  • Text Rendering with multiple fonts
  • Particle Systems
  • Some basic AI (state machine and pathfinding)
  • Config File Processing
  • Logging
  • Input from a mouse, keyboard, or Xbox 360 controller
    • Binding inputs from a config file
  • Python Scripting
    • In-Game Console

Some users (including me) have succesfully (without any major problems) compiled it under linux.

How do I append a node to an existing XML file in java

You can parse the existing XML file into DOM and append new elements to the DOM. Very similar to what you did with creating brand new XML. I am assuming you do not have to worry about duplicate server. If you do have to worry about that, you will have to go through the elements in the DOM to check for duplicates.

DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();

/* parse existing file to DOM */
Document document = documentBuilder.parse(new File("exisgint/xml/file"));

Element root = document.getDocumentElement();

for (Server newServer : Collection<Server> bunchOfNewServers){
  Element server = Document.createElement("server");
  /* create and setup the server node...*/

 root.appendChild(server);
}

/* use whatever method to output DOM to XML (for example, using transformer like you did).*/

SQL Server 100% CPU Utilization - One database shows high CPU usage than others

You can see some reports in SSMS:

Right-click the instance name / reports / standard / top sessions

You can see top CPU consuming sessions. This may shed some light on what SQL processes are using resources. There are a few other CPU related reports if you look around. I was going to point to some more DMVs but if you've looked into that already I'll skip it.

You can use sp_BlitzCache to find the top CPU consuming queries. You can also sort by IO and other things as well. This is using DMV info which accumulates between restarts.

This article looks promising.

Some stackoverflow goodness from Mr. Ozar.

edit: A little more advice... A query running for 'only' 5 seconds can be a problem. It could be using all your cores and really running 8 cores times 5 seconds - 40 seconds of 'virtual' time. I like to use some DMVs to see how many executions have happened for that code to see what that 5 seconds adds up to.

Is there a unique Android device ID?

You will get the wifi mac address by using the following code, regardless whether you used a randomized address when you tried to connect to the wifi or not, and regardless whether the wifi was turned on or off.

I used a method from the link below, and added a small modification to get the exact address instead of the randomized one:

Getting MAC address in Android 6.0

public static String getMacAddr() {
StringBuilder res1 = new StringBuilder();
try {
List<NetworkInterface> all =     
Collections.list(NetworkInterface.getNetworkInterfaces());
for (NetworkInterface nif : all) {    
if (!nif.getName().equalsIgnoreCase("p2p0")) continue;

        byte[] macBytes = nif.getHardwareAddress();
        if (macBytes == null) {
            continue;
        }

        res1 = new StringBuilder();
        for (byte b : macBytes) {
            res1.append(String.format("%02X:",b));
        }

        if (res1.length() > 0) {
            res1.deleteCharAt(res1.length() - 1);
        }
    }
} catch (Exception ex) {
}
return res1.toString();

}

Difference between setUp() and setUpBeforeClass()

Think of "BeforeClass" as a static initializer for your test case - use it for initializing static data - things that do not change across your test cases. You definitely want to be careful about static resources that are not thread safe.

Finally, use the "AfterClass" annotated method to clean up any setup you did in the "BeforeClass" annotated method (unless their self destruction is good enough).

"Before" & "After" are for unit test specific initialization. I typically use these methods to initialize / re-initialize the mocks of my dependencies. Obviously, this initialization is not specific to a unit test, but general to all unit tests.

How do I find the length/number of items present for an array?

If the array is statically allocated, use sizeof(array) / sizeof(array[0])

If it's dynamically allocated, though, unfortunately you're out of luck as this trick will always return sizeof(pointer_type)/sizeof(array[0]) (which will be 4 on a 32 bit system with char*s) You could either a) keep a #define (or const) constant, or b) keep a variable, however.

String Comparison in Java

The wording "comparison" is mildly misleading. You are not comparing for strict equality but for which string comes first in the dictionary (lexicon).

This is the feature that allows collections of strings to be sortable.

Note that this is very dependent on the active locale. For instance, here in Denmark we have a character "å" which used to be spelled as "aa" and is very distinct from two single a's (EDIT: If pronounced as "å"!). Hence Danish sorting rules treat two consequtive a's identically to an "å", which means that it goes after z. This also means that Danish dictionaries are sorted differently than English or Swedish ones.

Convert one date format into another in PHP

To convert $date from dd-mm-yyyy hh:mm:ss to a proper MySQL datetime I go like this:

$date = DateTime::createFromFormat('d-m-Y H:i:s',$date)->format('Y-m-d H:i:s');

ShowAllData method of Worksheet class failed

The simple way to avoid this is not to use the worksheet method ShowAllData

Autofilter has the same ShowAllData method which doesn't throw an error when the filter is enabled but no filter is set

If ActiveSheet.AutoFilterMode Then ActiveSheet.AutoFilter.ShowAllData

What's the default password of mariadb on fedora?

mariadb uses by defaults UNIX_SOCKET plugin to authenticate user root. https://mariadb.com/kb/en/mariadb/unix_socket-authentication-plugin/

"Because he has identified himself to the operating system, he does not need to do it again for the database"

so you need to login as the root user on unix to login as root in mysql/mariadb:

sudo mysql

if you want to login with root from your normal unix user, you can disable the authentication plugin for root.

Beforehand you can set the root password with mysql_secure_installation (default password is blank), then to let every user authenticate as root login with:

shell$ sudo mysql -u root
[mysql] use mysql;
[mysql] update user set plugin='' where User='root';
[mysql] flush privileges;
[mysql] \q

How to Make Laravel Eloquent "IN" Query?

If you are using Query builder then you may use a blow

DB::table(Newsletter Subscription)
->select('*')
->whereIn('id', $send_users_list)
->get()

If you are working with Eloquent then you can use as below

$sendUsersList = Newsletter Subscription:: select ('*')
                ->whereIn('id', $send_users_list)
                ->get();

Angular routerLink does not navigate to the corresponding component

I'm aware this question is fairly old by now, and you've most likely fixed it by now, but I'd like to post here as reference for anyone that finds this post while troubleshooting this issue is that this sort of thing won't work if your Anchor tags are in the Index.html. It needs to be in one of the components

How to select records from last 24 hours using SQL?

SELECT * 
FROM table_name
WHERE table_name.the_date > DATE_SUB(CURDATE(), INTERVAL 1 DAY)

Get the Year/Month/Day from a datetime in php?

Use DateTime with DateTime::format()

$datetime = new DateTime($dateTimeString);
echo $datetime->format('w');

"Could not find or load main class" Error while running java program using cmd prompt

Since you're running it from command prompt, you need to make sure your classpath is correct. If you set it already, you need to restart your terminal to re-load your system variables.

If -classpath and -cp are not used and CLASSPATH is not set, the current directory is used (.), however when running .class files, you need to be in the folder which consist Java package name folders.

So having the .class file in ./target/classes/com/foo/app/App.class, you've the following possibilities:

java -cp target/classes com.foo.app.App
CLASSPATH=target/classes java com.foo.app.App
cd target/classes && java com.foo.app.App

You can check your classpath, by printing CLASSPATH variable:

  • Linux: echo $CLASSPATH
  • Windows: echo %CLASSPATH%

which has entries separated by :.

See also: How do I run Java .class files?

Change url query string value using jQuery

If you only need to modify the page num you can replace it:

var newUrl = location.href.replace("page="+currentPageNum, "page="+newPageNum);

How do I set a variable to the output of a command in Bash?

Some Bash tricks I use to set variables from commands

Sorry, there is a loong answer, but as is a , where the main goal is to run other commands and react to resut code and/or output, ( commands are often piped filter, etc... ).

Storing command output in variables is something basic and fundamental.

Therefore, depending on

  • compatibility ()
  • kind of output (filter(s))
  • number of variable to set (split or interpret)
  • execution time (monitoring)
  • error trapping
  • repeatability of request (see long running background process, further)
  • interactivity (considering user input while reading from another input file descriptor)
  • do I miss something?

First simple, old, and compatible way

myPi=`echo '4*a(1)' | bc -l`
echo $myPi 
3.14159265358979323844

Mostly compatible, second way

As nesting could become heavy, parenthesis was implemented for this

myPi=$(bc -l <<<'4*a(1)')

Nested sample:

SysStarted=$(date -d "$(ps ho lstart 1)" +%s)
echo $SysStarted 
1480656334

features

Reading more than one variable (with Bashisms)

df -k /
Filesystem     1K-blocks   Used Available Use% Mounted on
/dev/dm-0         999320 529020    401488  57% /

If I just want a used value:

array=($(df -k /))

you could see an array variable:

declare -p array
declare -a array='([0]="Filesystem" [1]="1K-blocks" [2]="Used" [3]="Available" [
4]="Use%" [5]="Mounted" [6]="on" [7]="/dev/dm-0" [8]="999320" [9]="529020" [10]=
"401488" [11]="57%" [12]="/")'

Then:

echo ${array[9]}
529020

But I often use this:

{ read foo ; read filesystem size using avail prct mountpoint ; } < <(df -k /)
echo $using
529020

The first read foo will just skip header line, but in only one command, you will populate 7 different variables:

declare -p avail filesystem foo mountpoint prct size using
declare -- avail="401488"
declare -- filesystem="/dev/dm-0"
declare -- foo="Filesystem     1K-blocks   Used Available Use% Mounted on"
declare -- mountpoint="/"
declare -- prct="57%"
declare -- size="999320"
declare -- using="529020"

Or

{ read -a head;varnames=(${head[@]//[K1% -]});varnames=(${head[@]//[K1% -]});
  read ${varnames[@],,} ; } < <(LANG=C df -k /)

Then:

declare -p varnames ${varnames[@],,} 
declare -a varnames=([0]="Filesystem" [1]="blocks" [2]="Used" [3]="Available" [4]="Use" [5]="Mounted" [6]="on")
declare -- filesystem="/dev/dm-0"
declare -- blocks="999320"
declare -- used="529020"
declare -- available="401488"
declare -- use="57%"
declare -- mounted="/"
declare -- on=""

Or even:

{ read foo ; read filesystem dsk[{6,2,9}] prct mountpoint ; } < <(df -k /)
declare -p mountpoint dsk
declare -- mountpoint="/"
declare -a dsk=([2]="529020" [6]="999320" [9]="401488")

(Note Used and Blocks is switched there: read ... dsk[6] dsk[2] dsk[9] ...)

... will work with associative arrays too: read foo disk[total] disk[used] ...

Dedicated fd using unnamed fifo:

There is an elegent way:

users=()
while IFS=: read -u $list user pass uid gid name home bin ;do
    ((uid>=500)) &&
        printf -v users[uid] "%11d %7d %-20s %s\n" $uid $gid $user $home
done {list}</etc/passwd

Using this way (... read -u $list; ... {list}<inputfile) leave STDIN free for other purposes, like user interaction.

Then

echo -n "${users[@]}"
       1000    1000 user         /home/user
...
      65534   65534 nobody       /nonexistent

and

echo ${!users[@]}
1000 ... 65534

echo -n "${users[1000]}"
      1000    1000 user       /home/user

This could be used with static files or even /dev/tcp/xx.xx.xx.xx/yyy with x for ip address or hostname and y for port number:

{
    read -u $list -a head          # read header in array `head`
    varnames=(${head[@]//[K1% -]}) # drop illegal chars for variable names
    while read -u $list ${varnames[@],,} ;do
        ((pct=available*100/(available+used),pct<10)) &&
            printf "WARN: FS: %-20s on %-14s %3d <10 (Total: %11u, Use: %7s)\n" \
                "${filesystem#*/mapper/}" "$mounted" $pct $blocks "$use"
     done
 } {list}< <(LANG=C df -k)

And of course with inline documents:

while IFS=\; read -u $list -a myvar ;do
    echo ${myvar[2]}
done {list}<<"eof"
foo;bar;baz
alice;bob;charlie
$cherry;$strawberry;$memberberries
eof

Sample function for populating some variables:

#!/bin/bash

declare free=0 total=0 used=0

getDiskStat() {
    local foo
    {
        read foo
        read foo total used free foo
    } < <(
        df -k ${1:-/}
    )
}

getDiskStat $1
echo $total $used $free

Nota: declare line is not required, just for readability.

About sudo cmd | grep ... | cut ...

shell=$(cat /etc/passwd | grep $USER | cut -d : -f 7)
echo $shell
/bin/bash

(Please avoid useless cat! So this is just one fork less:

shell=$(grep $USER </etc/passwd | cut -d : -f 7)

All pipes (|) implies forks. Where another process have to be run, accessing disk, libraries calls and so on.

So using sed for sample, will limit subprocess to only one fork:

shell=$(sed </etc/passwd "s/^$USER:.*://p;d")
echo $shell

And with Bashisms:

But for many actions, mostly on small files, Bash could do the job itself:

while IFS=: read -a line ; do
    [ "$line" = "$USER" ] && shell=${line[6]}
  done </etc/passwd
echo $shell
/bin/bash

or

while IFS=: read loginname encpass uid gid fullname home shell;do
    [ "$loginname" = "$USER" ] && break
  done </etc/passwd
echo $shell $loginname ...

Going further about variable splitting...

Have a look at my answer to How do I split a string on a delimiter in Bash?

Alternative: reducing forks by using backgrounded long-running tasks

In order to prevent multiple forks like

myPi=$(bc -l <<<'4*a(1)'
myRay=12
myCirc=$(bc -l <<<" 2 * $myPi * $myRay ")

or

myStarted=$(date -d "$(ps ho lstart 1)" +%s)
mySessStart=$(date -d "$(ps ho lstart $$)" +%s)

This work fine, but running many forks is heavy and slow.

And commands like date and bc could make many operations, line by line!!

See:

bc -l <<<$'3*4\n5*6'
12
30

date -f - +%s < <(ps ho lstart 1 $$)
1516030449
1517853288

So we could use a long running background process to make many jobs, without having to initiate a new fork for each request.

Under , there is a built-in function: coproc:

coproc bc -l
echo 4*3 >&${COPROC[1]}
read -u $COPROC answer
echo $answer
12

echo >&${COPROC[1]} 'pi=4*a(1)'
ray=42.0
printf >&${COPROC[1]} '2*pi*%s\n' $ray
read -u $COPROC answer
echo $answer
263.89378290154263202896

printf >&${COPROC[1]} 'pi*%s^2\n' $ray
read -u $COPROC answer
echo $answer
5541.76944093239527260816

As bc is ready, running in background and I/O are ready too, there is no delay, nothing to load, open, close, before or after operation. Only the operation himself! This become a lot quicker than having to fork to bc for each operation!

Border effect: While bc stay running, they will hold all registers, so some variables or functions could be defined at initialisation step, as first write to ${COPROC[1]}, just after starting the task (via coproc).

Into a function newConnector

You may found my newConnector function on GitHub.Com or on my own site (Note on GitHub: there are two files on my site. Function and demo are bundled into one uniq file which could be sourced for use or just run for demo.)

Sample:

source shell_connector.sh

tty
/dev/pts/20

ps --tty pts/20 fw
    PID TTY      STAT   TIME COMMAND
  29019 pts/20   Ss     0:00 bash
  30745 pts/20   R+     0:00  \_ ps --tty pts/20 fw

newConnector /usr/bin/bc "-l" '3*4' 12

ps --tty pts/20 fw
    PID TTY      STAT   TIME COMMAND
  29019 pts/20   Ss     0:00 bash
  30944 pts/20   S      0:00  \_ /usr/bin/bc -l
  30952 pts/20   R+     0:00  \_ ps --tty pts/20 fw

declare -p PI
bash: declare: PI: not found

myBc '4*a(1)' PI
declare -p PI
declare -- PI="3.14159265358979323844"

The function myBc lets you use the background task with simple syntax, and for date:

newConnector /bin/date '-f - +%s' @0 0
myDate '2000-01-01'
  946681200
myDate "$(ps ho lstart 1)" boottime
myDate now now ; read utm idl </proc/uptime
myBc "$now-$boottime" uptime
printf "%s\n" ${utm%%.*} $uptime
  42134906
  42134906

ps --tty pts/20 fw
    PID TTY      STAT   TIME COMMAND
  29019 pts/20   Ss     0:00 bash
  30944 pts/20   S      0:00  \_ /usr/bin/bc -l
  32615 pts/20   S      0:00  \_ /bin/date -f - +%s
   3162 pts/20   R+     0:00  \_ ps --tty pts/20 fw

From there, if you want to end one of background processes, you just have to close its fd:

eval "exec $DATEOUT>&-"
eval "exec $DATEIN>&-"
ps --tty pts/20 fw
    PID TTY      STAT   TIME COMMAND
   4936 pts/20   Ss     0:00 bash
   5256 pts/20   S      0:00  \_ /usr/bin/bc -l
   6358 pts/20   R+     0:00  \_ ps --tty pts/20 fw

which is not needed, because all fd close when the main process finishes.

How to ORDER BY a SUM() in MySQL?

Without a GROUP BY clause, any summation will roll all rows up into a single row, so your query will indeed not work. If you grouped by, say, name, and ordered by sum(c_counts+f_counts), then you might get some useful results. But you would have to group by something.

Set Culture in an ASP.Net MVC app

I would do it in the Initialize event of the controller like this...

    protected override void Initialize(System.Web.Routing.RequestContext requestContext)
    {
        base.Initialize(requestContext);

        const string culture = "en-US";
        CultureInfo ci = CultureInfo.GetCultureInfo(culture);

        Thread.CurrentThread.CurrentCulture = ci;
        Thread.CurrentThread.CurrentUICulture = ci;
    }

Using Java generics for JPA findAll() query with WHERE clause

Hat tip to Adam Bien if you don't want to use createQuery with a String and want type safety:

 @PersistenceContext
 EntityManager em;

 public List<ConfigurationEntry> allEntries() {
        CriteriaBuilder cb = em.getCriteriaBuilder();
        CriteriaQuery<ConfigurationEntry> cq = cb.createQuery(ConfigurationEntry.class);
        Root<ConfigurationEntry> rootEntry = cq.from(ConfigurationEntry.class);
        CriteriaQuery<ConfigurationEntry> all = cq.select(rootEntry);
        TypedQuery<ConfigurationEntry> allQuery = em.createQuery(all);
        return allQuery.getResultList();
 }

http://www.adam-bien.com/roller/abien/entry/selecting_all_jpa_entities_as

UITapGestureRecognizer - single tap and double tap

Solution for Swift 2:

let singleTapGesture = UITapGestureRecognizer(target: self, action: #selector(handleSingleTap))
singleTapGesture.numberOfTapsRequired = 1 // Optional for single tap
view.addGestureRecognizer(singleTapGesture)

let doubleTapGesture = UITapGestureRecognizer(target: self, action: #selector(handleDoubleTap))
doubleTapGesture.numberOfTapsRequired = 2
view.addGestureRecognizer(doubleTapGesture)

singleTapGesture.requireGestureRecognizerToFail(doubleTapGesture)

Key existence check in HashMap

Do you mean that you've got code like

if(map.containsKey(key)) doSomethingWith(map.get(key))

all over the place ? Then you should simply check whether map.get(key) returned null and that's it. By the way, HashMap doesn't throw exceptions for missing keys, it returns null instead. The only case where containsKey is needed is when you're storing null values, to distinguish between a null value and a missing value, but this is usually considered bad practice.

How to SELECT in Oracle using a DBLINK located in a different schema?

I had the same problem I used the solution offered above - I dropped the SYNONYM, created a VIEW with the same name as the synonym. it had a select using the dblink , and gave GRANT SELECT to the other schema It worked great.

Pass a variable to a PHP script running from the command line

You could use what sep16 on php.net recommends:

<?php

parse_str(implode('&', array_slice($argv, 1)), $_GET);

?>

It behaves exactly like you'd expect with cgi-php.

$ php -f myfile.php type=daily a=1 b[]=2 b[]=3

will set $_GET['type'] to 'daily', $_GET['a'] to '1' and $_GET['b'] to array('2', '3').

currently unable to handle this request HTTP ERROR 500

Have you included the statement include ("fileName.php"); ?

Are you sure that file is in the correct directory?

Codesign error: Provisioning profile cannot be found after deleting expired profile

The solution of Brad Smith worked for me, but I also had to remove the CODE_SIGN_IDENTITY field to make it work.

Sharing url link does not show thumbnail image on facebook

My site faces same issue too.

Using Facebook debug tool is no help at all. Fetch new data but not IMAGE CACHE.

I forced facebook to clear IMAGE CACHE by add www. into image url. In your case is remove www. and config web server redirect.

 add/remove www. in image url should solve the problem

python: How do I know what type of exception occurred?

Unless somefunction is a very bad coded legacy function, you shouldn't need what you're asking.

Use multiple except clause to handle in different ways different exceptions:

try:
    someFunction()
except ValueError:
    # do something
except ZeroDivision:
    # do something else

The main point is that you shouldn't catch generic exception, but only the ones that you need to. I'm sure that you don't want to shadow unexpected errors or bugs.

What is the difference between varchar and varchar2 in Oracle?

  1. VARCHAR can store up to 2000 bytes of characters while VARCHAR2 can store up to 4000 bytes of characters.

  2. If we declare datatype as VARCHAR then it will occupy space for NULL values. In the case of VARCHAR2 datatype, it will not occupy any space for NULL values. e.g.,

    name varchar(10)

will reserve 6 bytes of memory even if the name is 'Ravi__', whereas

name varchar2(10) 

will reserve space according to the length of the input string. e.g., 4 bytes of memory for 'Ravi__'.

Here, _ represents NULL.

NOTE: varchar will reserve space for null values and varchar2 will not reserve any space for null values.

D3 transform scale and translate

I realize this question is fairly old, but wanted to share a quick demo of group transforms, paths/shapes, and relative positioning, for anyone else who found their way here looking for more info:

http://bl.ocks.org/dustinlarimer/6050773

Spring Could not Resolve placeholder

in my case, the war file generated didn't pick up the properties file so had to clean install again in IntelliJ editor.

javascript set cookie with expire time

I use a function to store cookies with a custom expire time in days:

// use it like: writeCookie("mycookie", "1", 30)
// this will set a cookie for 30 days since now
function writeCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else var expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}

jQuery getTime function

Digital Clock with jQuery

  <script type="text/javascript" src='http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js?ver=1.3.2'></script>
  <script type="text/javascript">
  $(document).ready(function() {
  function myDate(){
  var now = new Date();

  var outHour = now.getHours();
  if (outHour >12){newHour = outHour-12;outHour = newHour;}
  if(outHour<10){document.getElementById('HourDiv').innerHTML="0"+outHour;}
  else{document.getElementById('HourDiv').innerHTML=outHour;}

  var outMin = now.getMinutes();
  if(outMin<10){document.getElementById('MinutDiv').innerHTML="0"+outMin;}
  else{document.getElementById('MinutDiv').innerHTML=outMin;}

  var outSec = now.getSeconds();
  if(outSec<10){document.getElementById('SecDiv').innerHTML="0"+outSec;}
  else{document.getElementById('SecDiv').innerHTML=outSec;}

} myDate(); setInterval(function(){ myDate();}, 1000); }); </script> <style> body {font-family:"Comic Sans MS", cursive;} h1 {text-align:center;background: gray;color:#fff;padding:5px;padding-bottom:10px;} #Content {margin:0 auto;border:solid 1px gray;width:140px;display:table;background:gray;} #HourDiv, #MinutDiv, #SecDiv {float:left;color:#fff;width:40px;text-align:center;font-size:25px;} span {float:left;color:#fff;font-size:25px;} </style> <div id="clockDiv"></div> <h1>My jQery Clock</h1> <div id="Content"> <div id="HourDiv"></div><span>:</span><div id="MinutDiv"></div><span>:</span><div id="SecDiv"></div> </div>

How do you automatically resize columns in a DataGridView control AND allow the user to resize the columns on that same grid?

A simple two lines of code works for me.

dataGridView.DataSource = dataTable;
dataGridView.AutoResizeColumns();

Failed to decode downloaded font

Sometimes this problem happens when you upload/download the fonts using the wrong FTP method. Fonts must be FTP-ed using binary method, not ASCII. (Depending on your mood, it may feel counterintuitive, lol). If you ftp the font files using ASCII method, you can get this error message. If you ftp your files with an 'auto' method, and you get this error message, try ftp forcing the binary method.

Recover unsaved SQL query scripts

I was able to recover my files from the following location:

C:\Users\<yourusername>\Documents\SQL Server Management Studio\Backup Files\Solution1

There should be different recovery files per tab. I'd say look for the files for the date you lost them.

Add new line in text file with Windows batch file

You can use:

type text1.txt >> combine.txt
echo >> combine.txt
type text2.txt >> combine.txt

or something like this:

echo blah >> combine.txt
echo blah2 >> combine.txt
echo >> combine.txt
echo other >> combine.txt

What is the difference between declarations, providers, and import in NgModule?

Angular Concepts

  • imports makes the exported declarations of other modules available in the current module
  • declarations are to make directives (including components and pipes) from the current module available to other directives in the current module. Selectors of directives, components or pipes are only matched against the HTML if they are declared or imported.
  • providers are to make services and values known to DI (dependency injection). They are added to the root scope and they are injected to other services or directives that have them as dependency.

A special case for providers are lazy loaded modules that get their own child injector. providers of a lazy loaded module are only provided to this lazy loaded module by default (not the whole application as it is with other modules).

For more details about modules see also https://angular.io/docs/ts/latest/guide/ngmodule.html

  • exports makes the components, directives, and pipes available in modules that add this module to imports. exports can also be used to re-export modules such as CommonModule and FormsModule, which is often done in shared modules.

  • entryComponents registers components for offline compilation so that they can be used with ViewContainerRef.createComponent(). Components used in router configurations are added implicitly.

TypeScript (ES2015) imports

import ... from 'foo/bar' (which may resolve to an index.ts) are for TypeScript imports. You need these whenever you use an identifier in a typescript file that is declared in another typescript file.

Angular's @NgModule() imports and TypeScript import are entirely different concepts.

See also jDriven - TypeScript and ES6 import syntax

Most of them are actually plain ECMAScript 2015 (ES6) module syntax that TypeScript uses as well.

How to add a response header on nginx when using proxy_pass?

As oliver writes:

add_header works as well with proxy_pass as without.

However, as Shane writes, as of Nginx 1.7.5, you must pass always in order to get add_header to work for error responses, like so:

add_header  X-Upstream  $upstream_addr always;

How to convert integer to string in C?

Use sprintf():

int someInt = 368;
char str[12];
sprintf(str, "%d", someInt);

All numbers that are representable by int will fit in a 12-char-array without overflow, unless your compiler is somehow using more than 32-bits for int. When using numbers with greater bitsize, e.g. long with most 64-bit compilers, you need to increase the array size—at least 21 characters for 64-bit types.

Get the _id of inserted document in Mongo database in NodeJS

@JSideris, sample code for getting insertedId.

db.collection(COLLECTION).insertOne(data, (err, result) => {
    if (err) 
      return err;
    else 
      return result.insertedId;
  });

Angular CLI SASS options

ng set --global defaults.styleExt=scss is deprecated since ng6. You will get this message:

get/set have been deprecated in favor of the config command

You should use:

ng config schematics.@schematics/angular:component '{ styleext: "scss"}'

If you want to target a specific project (replace {project} with your project's name):

ng config projects.{project}.schematics.@schematics/angular:component '{ styleext: "scss"}'

How do I get bootstrap-datepicker to work with Bootstrap 3?

I also use Stefan Petre’s http://www.eyecon.ro/bootstrap-datepicker and it does not work with Bootstrap 3 without modification. Note that http://eternicode.github.io/bootstrap-datepicker/ is a fork of Stefan Petre's code.

You have to change your markup (the sample markup will not work) to use the new CSS and form grid layout in Bootstrap 3. Also, you have to modify some CSS and JavaScript in the actual bootstrap-datepicker implementation.

Here is my solution:

<div class="form-group row">
  <div class="col-xs-8">
    <label class="control-label">My Label</label>
    <div class="input-group date" id="dp3" data-date="12-02-2012" data-date-format="mm-dd-yyyy">
      <input class="form-control" type="text" readonly="" value="12-02-2012">
      <span class="input-group-addon"><i class="glyphicon glyphicon-calendar"></i></span>
    </div>
  </div>
</div>

CSS changes in datepicker.css on lines 176-177:

.input-group.date .input-group-addon i,
.input-group.date .input-group-addon i {

Javascript change in datepicker-bootstrap.js on line 34:

this.component = this.element.is('.date') ? this.element.find('.input-group-addon') : false;

UPDATE

Using the newer code from http://eternicode.github.io/bootstrap-datepicker/ the changes are as follows:

CSS changes in datepicker.css on lines 446-447:

.input-group.date .input-group-addon i,
.input-group.date .input-group-addon i {

Javascript change in datepicker-bootstrap.js on line 46:

 this.component = this.element.is('.date') ? this.element.find('.input-group-addon, .btn') : false;

Finally, the JavaScript to enable the datepicker (with some options):

 $(".input-group.date").datepicker({ autoclose: true, todayHighlight: true });

Tested with Bootstrap 3.0 and JQuery 1.9.1. Note that this fork is better to use than the other as it is more feature rich, has localization support and auto-positions the datepicker based on the control position and window size, avoiding the picker going off the screen which was a problem with the older version.

Is it possible to execute multiple _addItem calls asynchronously using Google Analytics?

From the docs:

_trackTrans() Sends both the transaction and item data to the Google Analytics server. This method should be called after _trackPageview(), and used in conjunction with the _addItem() and addTrans() methods. It should be called after items and transaction elements have been set up.

So, according to the docs, the items get sent when you call trackTrans(). Until you do, you can add items, but the transaction will not be sent.

Edit: Further reading led me here:

http://www.analyticsmarket.com/blog/edit-ecommerce-data

Where it clearly says you can start another transaction with an existing ID. When you commit it, the new items you listed will be added to that transaction.

Error: 10 $digest() iterations reached. Aborting! with dynamic sortby predicate

I got this error in the context of angular tree control. In my case it was the tree options. I was returning treeOptions() from a function. It was always returning the same object. But Angular magically thinks that its a new object and then cause a digest cycle to kick off. Causing a recursion of digests. The solution was to bind the treeOptions to scope. And assign it just once.

AngularJS $watch window resize inside directive

// Following is angular 2.0 directive for window re size that adjust scroll bar for give element as per your tag

---- angular 2.0 window resize directive.
import { Directive, ElementRef} from 'angular2/core';

@Directive({
       selector: '[resize]',
       host: { '(window:resize)': 'onResize()' } // Window resize listener
})

export class AutoResize {

element: ElementRef; // Element that associated to attribute.
$window: any;
       constructor(_element: ElementRef) {

         this.element = _element;
         // Get instance of DOM window.
         this.$window = angular.element(window);

         this.onResize();

    }

    // Adjust height of element.
    onResize() {
         $(this.element.nativeElement).css('height', (this.$window.height() - 163) + 'px');
   }
}

Does Arduino use C or C++?

Arduino sketches are written in C++.

Here is a typical construct you'll encounter:

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
...
lcd.begin(16, 2);
lcd.print("Hello, World!");

That's C++, not C.

Hence do yourself a favor and learn C++. There are plenty of books and online resources available.

Execute Stored Procedure from a Function

Another option, in addition to using OPENQUERY and xp_cmdshell, is to use SQLCLR (SQL Server's "CLR Integration" feature). Not only is the SQLCLR option more secure than those other two methods, but there is also the potential benefit of being able to call the stored procedure in the current session such that it would have access to any session-based objects or settings, such as:

  • temporary tables
  • temporary stored procedures
  • CONTEXT_INFO

This can be achieved by using "context connection = true;" as the ConnectionString. Just keep in mind that all other restrictions placed on T-SQL User-Defined Functions will be enforced (i.e. cannot have any side-effects).

If you use a regular connection (i.e. not using the context connection), then it will operate as an independent call, just like it does when using the OPENQUERY and xp_cmdshell methods.

HOWEVER, please keep in mind that if you will be using a function that calls a stored procedure (regardless of which of the 3 noted methods you use) in a statement that affects more than 1 row, then the behavior cannot be expected to run once per row. As @MartinSmith mentioned in a comment on @MatBailie's answer, the Query Optimizer does not guarantee either the timing or number of executions of functions. But if you are using it in a SET @Variable = function(); statement or SELECT * FROM function(); query, then it should be ok.

An example of using a .NET / C# SQLCLR user-defined function to execute a stored procedure is shown in the following article (which I wrote):

Stairway to SQLCLR Level 2: Sample Stored Procedure and Function

Modifying Objects within stream in Java8 while iterating

Instead of creating strange things, you can just filter() and then map() your result.

This is much more readable and sure. Streams will make it in only one loop.

WCF gives an unsecured or incorrectly secured fault error

Try changing your security mode to "transport".

You have a mismatch between the security tag and the transport tag.

Python Selenium accessing HTML source

You can simply use the WebDriver object, and access to the page source code via its @property field page_source...

Try this code snippet :-)

from selenium import webdriver
driver = webdriver.Firefox('path/to/executable')
driver.get('https://some-domain.com')
source = driver.page_source
if 'stuff' in source:
    print('found...')
else:
    print('not in source...')

jQuery datepicker years shown

 $("#DateOfBirth").datepicker({
        yearRange: "-100:+0",
        changeMonth: true,
        changeYear: true,
    });

yearRange: '1950:2013', // specifying a hard coded year range or this way

yearRange: "-100:+0", // last hundred years

It will help to show drop down for year and month selection.

Letter Count on a string

Alternatively You can use:

mystring = 'banana'
number = mystring.count('a')

Why is using a wild card with a Java import statement bad?

Here are the few things that I found regarding this topic.

  • During compilation, the compiler tries to find classes that are used in the code from the .* import and the corresponding byte code will be generated by selecting the used classes from .* import. So the byte code of using .* import or .class names import will be same and the runtime performance will also be the same because of the same byte code.

  • In each compilation, the compiler has to scan all the classes of .* package to match the classes that are actually used in the code. So, code with .* import takes more time during the compilation process as compared to using .class name imports.

  • Using .* import helps to make code more cleaner

  • Using .* import can create ambiguity when we use two classes of the same name from two different packages. Eg, Date is available in both packages.

      import java.util.*;
      import java.sql.*;
    
      public class DateDemo {
          private Date utilDate;
          private Date sqlDate;
      }
    

Class 'ViewController' has no initializers in swift

For me was a declaration incomplete. For example:

var isInverted: Bool

Instead the correct way:

var isInverted: Bool = false

SQL Server Management Studio alternatives to browse/edit tables and run queries

I have been using Atlantis SQL Enywhere, a free software, for almost 6 months and has been working really well. Works with SQL 2005 and SQL 2008 versions. I am really impressed with its features and keyboard shortcuts are similar to VS, so makes the transition really smooth to a new editor.

Some of the features that are worth mentioning:

  • Intellisense that actually works when using multiple tables and joins with aliases
  • Suggestion of joins when using multiple tables (reduces time on typing, really neat)
  • Rich formatting of sql code, AutoIndent using Ctrl K, Ctrl D.
  • Better representation of SQL plans
  • Highlights variables declarations while they are used.
  • Table definition on mouse hover.

All these features have saved me lot of time.

C++ pass an array by reference

8.3.5.8 If the type of a parameter includes a type of the form “pointer to array of unknown bound of T” or “reference to array of unknown bound of T,” the program is ill-formed

Using ORDER BY and GROUP BY together

Just you need to desc with asc. Write the query like below. It will return the values in ascending order.

SELECT * FROM table GROUP BY m_id ORDER BY m_id asc;

TCPDF output without saving file

If You want to open dialogue window in browser to save, not open with PDF browser viewer (I was looking for this solution for a while), You should use 'D':

$pdf->Output('name.pdf', 'D');

overlay a smaller image on a larger image python OpenCv

Here it is:

def put4ChannelImageOn4ChannelImage(back, fore, x, y):
    rows, cols, channels = fore.shape    
    trans_indices = fore[...,3] != 0 # Where not transparent
    overlay_copy = back[y:y+rows, x:x+cols] 
    overlay_copy[trans_indices] = fore[trans_indices]
    back[y:y+rows, x:x+cols] = overlay_copy

#test
background = np.zeros((1000, 1000, 4), np.uint8)
background[:] = (127, 127, 127, 1)
overlay = cv2.imread('imagee.png', cv2.IMREAD_UNCHANGED)
put4ChannelImageOn4ChannelImage(background, overlay, 5, 5)

Get DOS path instead of Windows path

run cmd.exe and do the following:

> cd "long path name"
> command

Then command.com will come up and display only short paths.

source

Export multiple classes in ES6 modules

Hope this helps:

// Export (file name: my-functions.js)
export const MyFunction1 = () => {}
export const MyFunction2 = () => {}
export const MyFunction3 = () => {}

// if using `eslint` (airbnb) then you will see warning, so do this:
const MyFunction1 = () => {}
const MyFunction2 = () => {}
const MyFunction3 = () => {}

export {MyFunction1, MyFunction2, MyFunction3};

// Import
import * as myFns from "./my-functions";

myFns.MyFunction1();
myFns.MyFunction2();
myFns.MyFunction3();


// OR Import it as Destructured
import { MyFunction1, MyFunction2, MyFunction3 } from "./my-functions";

// AND you can use it like below with brackets (Parentheses) if it's a function 
// AND without brackets if it's not function (eg. variables, Objects or Arrays)  
MyFunction1();
MyFunction2();

Alert handling in Selenium WebDriver (selenium 2) with Java

Write the following method:

public boolean isAlertPresent() {
    try {
        driver.switchTo().alert();
        return true;
    } // try
    catch (Exception e) {
        return false;
    } // catch
}

Now, you can check whether alert is present or not by using the method written above as below:

if (isAlertPresent()) {
    driver.switchTo().alert();
    driver.switchTo().alert().accept();
    driver.switchTo().defaultContent();
}

How to count rows with SELECT COUNT(*) with SQLAlchemy?

Query for just a single known column:

session.query(MyTable.col1).count()

Angular2 *ngIf check object array length in template

<div class="row" *ngIf="teamMembers?.length > 0">

This checks first if teamMembers has a value and if teamMembers doesn't have a value, it doesn't try to access length of undefined because the first part of the condition already fails.

Why am I getting an OPTIONS request instead of a GET request?

I was able to fix it with the help of following headers

Access-Control-Allow-Origin
Access-Control-Allow-Headers
Access-Control-Allow-Credentials
Access-Control-Allow-Methods

If you are on Nodejs, here is the code you can copy/paste.

app.use((req, res, next) => {
  res.header('Access-Control-Allow-Origin','*');
  res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');
  res.header('Access-Control-Allow-Credentials', true);
  res.header('Access-Control-Allow-Methods', 'GET, POST, PUT, PATCH');
  next();
});

jquery beforeunload when closing (not leaving) the page?

Try this, loading data via ajax and displaying through return statement.

<script type="text/javascript">
function closeWindow(){

    var Data = $.ajax({
        type : "POST",
        url : "file.txt",  //loading a simple text file for sample.
        cache : false,
        global : false,
        async : false,
        success : function(data) {
            return data;
        }

    }).responseText;


    return "Are you sure you want to leave the page? You still have "+Data+" items in your shopping cart";
}

window.onbeforeunload = closeWindow;
</script>

Insert all data of a datagridview to database at once

Please see if below can help you

Class Post_Sales

Public Shared Sub Post_sales()

    Dim ITM_ID As Integer

    Dim SLS_QTY As Integer

    Dim SLS_PRC As Double

    Dim SLS_AMT As Double

    Dim DSPL_RCT As String

    Dim TAX_CODE As Integer


    'Format the current  date and send it to a textbox
    Form1.TextBox6.Text = System.DateTime.Now.ToString((" yyyy-MM-dd"))

    'Open Connection

    Dim con As New SqlConnection("Initial Catalog=Your Database here;Data source=.;Network Library=DBMSSOCN;User ID=sa;Password=")

    con.Open()

    'Insert Records into the database


    For Each rw As DataGridViewRow In Form1.DataGridView1.Rows

        ITM_ID = rw.Cells("Column1").Value
        DSPL_RCT = rw.Cells("Column2").Value
        SLS_QTY = rw.Cells("Column3").Value
        SLS_PRC = rw.Cells("Column4").Value
        SLS_AMT = rw.Cells("Column5").Value
        TAX_CODE = rw.Cells("Column6").Value

        Dim cmd As New SqlCommand("INSERT INTO DAY_PLUSALES (DT,ITM_ID,DSPL_RCT,SLS_QTY,SLS_PRC,SLS_AMT,TAX_CODE) values ('" & Form1.TextBox6.Text & "','" & ITM_ID & "','" & DSPL_RCT & "','" & SLS_QTY & "','" & SLS_PRC & "','" & SLS_AMT & "','" & TAX_CODE & "')", con)

        cmd.ExecuteNonQuery()

    Next

    con.Close()

    MessageBox.Show("Records Added to the SQL Database successfully!", "Records Updated ")

End Sub

End Class

if arguments is equal to this string, define a variable like this string

It seems that you are looking to parse commandline arguments into your bash script. I have searched for this recently myself. I came across the following which I think will assist you in parsing the arguments:

http://rsalveti.wordpress.com/2007/04/03/bash-parsing-arguments-with-getopts/

I added the snippet below as a tl;dr

#using : after a switch variable means it requires some input (ie, t: requires something after t to validate while h requires nothing.
while getopts “ht:r:p:v” OPTION
do
     case $OPTION in
         h)
             usage
             exit 1
             ;;
         t)
             TEST=$OPTARG
             ;;
         r)
             SERVER=$OPTARG
             ;;
         p)
             PASSWD=$OPTARG
             ;;
         v)
             VERBOSE=1
             ;;
         ?)
             usage
             exit
             ;;
     esac
done

if [[ -z $TEST ]] || [[ -z $SERVER ]] || [[ -z $PASSWD ]]
then
     usage
     exit 1
fi

./script.sh -t test -r server -p password -v

CSS: how to add white space before element's content?

You can use the unicode of a non breaking space :

p:before { content: "\00a0 "; }

See JSfiddle demo

[style improved by @Jason Sperske]

Multiple simultaneous downloads using Wget?

use the aria2 :

aria2c -x 16 [url]
#          |
#          |
#          |
#          ----> the number of connections 

http://aria2.sourceforge.net

I love it !!

InvalidKeyException : Illegal Key Size - Java code throwing exception for encryption class - how to fix?

I faced the same issue. Tried adding the US_export_policy.jar and local_policy.jar in the java security folder first but the issue persisted. Then added the below in java_opts inside tomcat setenv.shfile and it worked.

-Djdk.tls.ephemeralDHKeySize=2048

Please check this link for further info

get specific row from spark dataframe

When you want to fetch max value of a date column from dataframe, just the value without object type or Row object information, you can refer to below code.

table = "mytable"

max_date = df.select(max('date_col')).first()[0]

2020-06-26
instead of Row(max(reference_week)=datetime.date(2020, 6, 26))

How do I remove my IntelliJ license in 2019.3?

I think there are more solutions!

You can start the app, and here are 3 things you can do:

  1. If the app shows for the first time the "import settings" dialog and then the "create/open a project" dialog, you can click on Settings > Manage License... > Remove License, and that removes for all Jetbrains products*.
  2. If you open products like IntelliJ IDEA and have projects currently active (like the app open automatically the all IDE without prompt), then click on File > Close Project, and follow the first step.
  3. Inside any app of IntelliJ, click on Help > Register... > Remove license.

*In case you have a license for a pack of products. If not, you have to remove the license per product individually. Check the 3rd step.

List of Java processes

You can use single command pgrep as well (doesn't require you to use pipes and multiple commands):

pgrep -fl java

'ls' in CMD on Windows is not recognized

Use the command dir to list all the directories and files in a directory; ls is a unix command.

Get the selected option id with jQuery

Th easiest way to this is var id = $(this).val(); from inside an event like on change.

Python - Locating the position of a regex match in a string?

You could use .find("is"), it would return position of "is" in the string

or use .start() from re

>>> re.search("is", String).start()
2

Actually its match "is" from "This"

If you need to match per word, you should use \b before and after "is", \b is the word boundary.

>>> re.search(r"\bis\b", String).start()
5
>>>

for more info about python regular expressions, docs here

cartesian product in pandas

If you have a key that is repeated for each row, then you can produce a cartesian product using merge (like you would in SQL).

from pandas import DataFrame, merge
df1 = DataFrame({'key':[1,1], 'col1':[1,2],'col2':[3,4]})
df2 = DataFrame({'key':[1,1], 'col3':[5,6]})

merge(df1, df2,on='key')[['col1', 'col2', 'col3']]

Output:

   col1  col2  col3
0     1     3     5
1     1     3     6
2     2     4     5
3     2     4     6

See here for the documentation: http://pandas.pydata.org/pandas-docs/stable/merging.html#brief-primer-on-merge-methods-relational-algebra

hash function for string

One thing I've used with good results is the following (I don't know if its mentioned already because I can't remember its name).

You precompute a table T with a random number for each character in your key's alphabet [0,255]. You hash your key 'k0 k1 k2 ... kN' by taking T[k0] xor T[k1] xor ... xor T[kN]. You can easily show that this is as random as your random number generator and its computationally very feasible and if you really run into a very bad instance with lots of collisions you can just repeat the whole thing using a fresh batch of random numbers.

How to use split?

If it is the basic JavaScript split function, look at documentation, JavaScript split() Method.

Basically, you just do this:

var array = myString.split(' -- ')

Then your two values are stored in the array - you can get the values like this:

var firstValue = array[0];
var secondValue = array[1];

What is the best way to merge mp3 files?

MP3 files have headers you need to respect.

You could ether use a library like Open Source Audio Library Project and write a tool around it. Or you can use a tool that understands mp3 files like Audacity.

Setting a max character length in CSS

example code:

_x000D_
_x000D_
.limited-text{_x000D_
    white-space: nowrap;_x000D_
    width: 400px;_x000D_
    overflow: hidden;_x000D_
    text-overflow: ellipsis;_x000D_
}
_x000D_
<p class="limited-text">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ut odio temporibus voluptas error distinctio hic quae corrupti vero doloribus optio! Inventore ex quaerat modi blanditiis soluta maiores illum, ab velit.</p>_x000D_
_x000D_
    
_x000D_
_x000D_
_x000D_

Difference between Running and Starting a Docker container

Explanation with an example:

Consider you have a game (iso) image in your computer.

When you run (mount your image as a virtual drive), a virtual drive is created with all the game contents in the virtual drive and the game installation file is automatically launched. [Running your docker image - creating a container and then starting it.]

But when you stop (similar to docker stop) it, the virtual drive still exists but stopping all the processes. [As the container exists till it is not deleted]

And when you do start (similar to docker start), from the virtual drive the games files start its execution. [starting the existing container]

In this example - The game image is your Docker image and virtual drive is your container.

How can I increase the size of a bootstrap button?

bootstrap comes with clas btn-lg http://getbootstrap.com/components/#btn-dropdowns-sizing

<div class="btn btn-default btn-block">
  Active
</div>

but if you want to have the button of the width of your column / container add btn-block

<div class="btn btn-default btn-lg">
      Active
    </div>

However this will expand to 100% so make surt ethat you will wrap your button in certain amount of columns e.g. then you know its always stays 3 columns until xs screen

<div class="col-sm-3">
             <div class="btn btn-default btn-block">
          Active
            </div>
        </div>

yii2 hidden input value

you can also do this

$model->hidden1 = 'your value';// better put it on controller
$form->field($model, 'hidden1')->hiddenInput()->label(false);

this is a better option if you set value on controller

$model = new SomeModelName();

if ($model->load(Yii::$app->request->post()) && $model->save()) {
    return $this->redirect(['view', 'id' => $model->group_id]);
 } else {
    $model->hidden1 = 'your value';
    return $this->render('create', [
        'model' => $model,
    ]);
 }

top align in html table?

<TABLE COLS="3" border="0" cellspacing="0" cellpadding="0">
    <TR style="vertical-align:top">
        <TD>
            <!-- The log text-box -->
            <div style="height:800px; width:240px; border:1px solid #ccc; font:16px/26px Georgia, Garamond, Serif; overflow:auto;">
                Log:
            </div>
        </TD>
        <TD>
            <!-- The 2nd column -->
        </TD>
        <TD>
            <!-- The 3rd column -->
        </TD>
    </TR>
</TABLE>

Can't install laravel installer via composer

It says that it requires zip extension

laravel/installer v1.4.0 requires ext-zip...

Install using (to install the default version):

sudo apt install php-zip

Or, if you're running a specific version of PHP:

# For php v7.0
sudo apt-get install php7.0-zip

# For php v7.1
sudo apt-get install php7.1-zip

# For php v7.2
sudo apt-get install php7.2-zip

# For php v7.3
sudo apt-get install php7.3-zip

# For php v7.4
sudo apt-get install php7.4-zip

How to extract img src, title and alt from html using php?

You may use simplehtmldom. Most of the jQuery selectors are supported in simplehtmldom. An example is given below

// Create DOM from URL or file
$html = file_get_html('http://www.google.com/');

// Find all images
foreach($html->find('img') as $element)
       echo $element->src . '<br>';

// Find all links
foreach($html->find('a') as $element)
       echo $element->href . '<br>'; 

Moving from JDK 1.7 to JDK 1.8 on Ubuntu

Most of the answers for this question can not helped me in 2020.

This notification from download site of Oracle may be the reason:

Important Oracle JDK License Update

The Oracle JDK License has changed for releases starting April 16, 2019.

I try to google a little bit and those tutorials below helped me a lot.

  1. Remove completely the previous version of JVM installed on your PC.

    sudo update-alternatives --remove-all java
    sudo update-alternatives --remove-all javac
    sudo update-alternatives --remove-all javaws
    
    # /usr/lib/jvm/jdk1.7.0 is the path you installed the previous version of JVM on your PC
    sudo rm -rf /usr/lib/jvm/jdk1.7.0 
    

    Check to see whether java is uninstalled or not

    java -version
    
  2. Install Java 8 JDK.

    • Download Java 8 from Oracle's website. The version being used is 1.8.0_251. Pay attention to this value, you may need it to edit commands in this answer when Java 8 is upgraded to another version.
    • Extract the compressed file to the place where you want to install.

    cd /usr/lib/jvm
    sudo tar xzf ~/Downloads/jdk-8u251-linux-x64.tar.gz
    
    • Edit environment file

    sudo gedit /etc/environment
    
    • Edit the PATH's value by appending the string below to the current value

    :/usr/lib/jvm/jdk1.8.0_251/bin:/usr/lib/jvm/jdk1.8.0_251/jre/bin
    
    • Append those strings to the environment file

    J2SDKDIR="/usr/lib/jvm/jdk1.8.0_251"
    J2REDIR="/usr/lib/jvm/jdk1.8.0_251/jre"
    JAVA_HOME="/usr/lib/jvm/jdk1.8.0_251"
    
    • Complete the installation by running commands below

    sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.8.0_251/bin/java" 0
    sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk1.8.0_251/bin/javac" 0
    sudo update-alternatives --set java /usr/lib/jvm/jdk1.8.0_251/bin/java
    sudo update-alternatives --set javac /usr/lib/jvm/jdk1.8.0_251/bin/javac
    
    update-alternatives --list java
    update-alternatives --list javac
    

"Post Image data using POSTMAN"

That's not how you send file on postman. What you did is sending a string which is the path of your image, nothing more.

What you should do is;

  1. After setting request method to POST, click to the 'body' tab.
  2. Select form-data. At first line, you'll see text boxes named key and value. Write 'image' to the key. You'll see value type which is set to 'text' as default. Make it File and upload your file.
  3. Then select 'raw' and paste your json file. Also just next to the binary choice, You'll see 'Text' is clicked. Make it JSON.

form-data section

raw section

You're ready to go.

In your Django view,

from rest_framework.views import APIView
from rest_framework.parsers import MultiPartParser
from rest_framework.decorators import parser_classes

@parser_classes((MultiPartParser, ))
class UploadFileAndJson(APIView):

    def post(self, request, format=None):
        thumbnail = request.FILES["file"]
        info = json.loads(request.data['info'])
        ...
        return HttpResponse()

What's the simplest way of detecting keyboard input in a script from the terminal?

Well, since the date of this question post, a Python library addressed this topic. pynput library, from Moses Palmer, is GREAT to catch keyboard and mouse events in a very simple way.

(mind the missing 'i' in pynput - I missed it too... ;-) )

Print time in a batch file (milliseconds)

If you're doing something like

for /l %%i in (1,1,500) do @echo %time%

or

if foo (
    echo %time%
    do_something
    echo %time%
)

then you could simply put a setlocal enabledelayedexpansion at the beginning of your batch file and use !time! instead of %time% which gets evaluated on execution, not on parsing the line (which includes complete blocks enclosed in parentheses).

How to modify PATH for Homebrew?

There are many ways to update your path. Jun1st answer works great. Another method is to augment your .bash_profile to have:

export PATH="/usr/local/bin:/usr/local/sbin:~/bin:$PATH"

The line above places /usr/local/bin and /usr/local/sbin in front of your $PATH. Once you source your .bash_profile or start a new terminal you can verify your path by echo'ing it out.

$ echo $PATH
/usr/local/bin:/usr/local/sbin:/Users/<your account>/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin

Once satisfied with the result running $ brew doctor again should no longer produce your error.

This blog post helped me out in resolving issues I ran into. http://moncefbelyamani.com/how-to-install-xcode-homebrew-git-rvm-ruby-on-mac/

Parsing JSON in Java without knowing JSON format

Would you be satisfied with a Map from Jackson?

ObjectMapper objectMapper = new ObjectMapper();
Map<String, Object> map = objectMapper.readValue(jsonString, new TypeReference<HashMap<String,Object>>(){});

Or maybe a JsonNode?

JsonNode jsonNode = objectMapper.readTree(String jsonString) 

Differences between action and actionListener

actionListener

Use actionListener if you want have a hook before the real business action get executed, e.g. to log it, and/or to set an additional property (by <f:setPropertyActionListener>), and/or to have access to the component which invoked the action (which is available by ActionEvent argument). So, purely for preparing purposes before the real business action gets invoked.

The actionListener method has by default the following signature:

import javax.faces.event.ActionEvent;
// ...

public void actionListener(ActionEvent event) {
    // ...
}

And it's supposed to be declared as follows, without any method parentheses:

<h:commandXxx ... actionListener="#{bean.actionListener}" />

Note that you can't pass additional arguments by EL 2.2. You can however override the ActionEvent argument altogether by passing and specifying custom argument(s). The following examples are valid:

<h:commandXxx ... actionListener="#{bean.methodWithoutArguments()}" />
<h:commandXxx ... actionListener="#{bean.methodWithOneArgument(arg1)}" />
<h:commandXxx ... actionListener="#{bean.methodWithTwoArguments(arg1, arg2)}" />
public void methodWithoutArguments() {}
public void methodWithOneArgument(Object arg1) {}
public void methodWithTwoArguments(Object arg1, Object arg2) {}

Note the importance of the parentheses in the argumentless method expression. If they were absent, JSF would still expect a method with ActionEvent argument.

If you're on EL 2.2+, then you can declare multiple action listener methods via <f:actionListener binding>.

<h:commandXxx ... actionListener="#{bean.actionListener1}">
    <f:actionListener binding="#{bean.actionListener2()}" />
    <f:actionListener binding="#{bean.actionListener3()}" />
</h:commandXxx>
public void actionListener1(ActionEvent event) {}
public void actionListener2() {}
public void actionListener3() {}

Note the importance of the parentheses in the binding attribute. If they were absent, EL would confusingly throw a javax.el.PropertyNotFoundException: Property 'actionListener1' not found on type com.example.Bean, because the binding attribute is by default interpreted as a value expression, not as a method expression. Adding EL 2.2+ style parentheses transparently turns a value expression into a method expression. See also a.o. Why am I able to bind <f:actionListener> to an arbitrary method if it's not supported by JSF?


action

Use action if you want to execute a business action and if necessary handle navigation. The action method can (thus, not must) return a String which will be used as navigation case outcome (the target view). A return value of null or void will let it return to the same page and keep the current view scope alive. A return value of an empty string or the same view ID will also return to the same page, but recreate the view scope and thus destroy any currently active view scoped beans and, if applicable, recreate them.

The action method can be any valid MethodExpression, also the ones which uses EL 2.2 arguments such as below:

<h:commandXxx value="submit" action="#{bean.edit(item)}" />

With this method:

public void edit(Item item) {
    // ...
}

Note that when your action method solely returns a string, then you can also just specify exactly that string in the action attribute. Thus, this is totally clumsy:

<h:commandLink value="Go to next page" action="#{bean.goToNextpage}" />

With this senseless method returning a hardcoded string:

public String goToNextpage() {
    return "nextpage";
}

Instead, just put that hardcoded string directly in the attribute:

<h:commandLink value="Go to next page" action="nextpage" />

Please note that this in turn indicates a bad design: navigating by POST. This is not user nor SEO friendly. This all is explained in When should I use h:outputLink instead of h:commandLink? and is supposed to be solved as

<h:link value="Go to next page" outcome="nextpage" />

See also How to navigate in JSF? How to make URL reflect current page (and not previous one).


f:ajax listener

Since JSF 2.x there's a third way, the <f:ajax listener>.

<h:commandXxx ...>
    <f:ajax listener="#{bean.ajaxListener}" />
</h:commandXxx>

The ajaxListener method has by default the following signature:

import javax.faces.event.AjaxBehaviorEvent;
// ...

public void ajaxListener(AjaxBehaviorEvent event) {
    // ...
}

In Mojarra, the AjaxBehaviorEvent argument is optional, below works as good.

public void ajaxListener() {
    // ...
}

But in MyFaces, it would throw a MethodNotFoundException. Below works in both JSF implementations when you want to omit the argument.

<h:commandXxx ...>
    <f:ajax execute="@form" listener="#{bean.ajaxListener()}" render="@form" />
</h:commandXxx>

Ajax listeners are not really useful on command components. They are more useful on input and select components <h:inputXxx>/<h:selectXxx>. In command components, just stick to action and/or actionListener for clarity and better self-documenting code. Moreover, like actionListener, the f:ajax listener does not support returning a navigation outcome.

<h:commandXxx ... action="#{bean.action}">
    <f:ajax execute="@form" render="@form" />
</h:commandXxx>

For explanation on execute and render attributes, head to Understanding PrimeFaces process/update and JSF f:ajax execute/render attributes.


Invocation order

The actionListeners are always invoked before the action in the same order as they are been declared in the view and attached to the component. The f:ajax listener is always invoked before any action listener. So, the following example:

<h:commandButton value="submit" actionListener="#{bean.actionListener}" action="#{bean.action}">
    <f:actionListener type="com.example.ActionListenerType" />
    <f:actionListener binding="#{bean.actionListenerBinding()}" />
    <f:setPropertyActionListener target="#{bean.property}" value="some" />
    <f:ajax listener="#{bean.ajaxListener}" />
</h:commandButton>

Will invoke the methods in the following order:

  1. Bean#ajaxListener()
  2. Bean#actionListener()
  3. ActionListenerType#processAction()
  4. Bean#actionListenerBinding()
  5. Bean#setProperty()
  6. Bean#action()

Exception handling

The actionListener supports a special exception: AbortProcessingException. If this exception is thrown from an actionListener method, then JSF will skip any remaining action listeners and the action method and proceed to render response directly. You won't see an error/exception page, JSF will however log it. This will also implicitly be done whenever any other exception is being thrown from an actionListener. So, if you intend to block the page by an error page as result of a business exception, then you should definitely be performing the job in the action method.

If the sole reason to use an actionListener is to have a void method returning to the same page, then that's a bad one. The action methods can perfectly also return void, on the contrary to what some IDEs let you believe via EL validation. Note that the PrimeFaces showcase examples are littered with this kind of actionListeners over all place. This is indeed wrong. Don't use this as an excuse to also do that yourself.

In ajax requests, however, a special exception handler is needed. This is regardless of whether you use listener attribute of <f:ajax> or not. For explanation and an example, head to Exception handling in JSF ajax requests.

How do I change the database name using MySQL?

You can use below command

alter database Testing modify name=LearningSQL;

Old Database Name = Testing, New Database Name = LearningSQL

Android - default value in editText

 public class Main extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        EditText et = (EditText) findViewById(R.id.et);
        EditText et_city = (EditText) findViewById(R.id.et_city);
        // Set the default text of second EditText widget
        et_city.setText("USA");
 }
}

Android fastboot waiting for devices

On your device Go To Settings -> Dev Settings, And Select "Allow OEM Unlock" As shown on Unlock Your Bootloader

At least this worked for me on my MotoE 4G.

Spring Data JPA map the native query result to Non-Entity POJO

In my computer, I get this code works.It's a little different from Daimon's answer.

_x000D_
_x000D_
@SqlResultSetMapping(_x000D_
    name="groupDetailsMapping",_x000D_
    classes={_x000D_
        @ConstructorResult(_x000D_
            targetClass=GroupDetails.class,_x000D_
            columns={_x000D_
                @ColumnResult(name="GROUP_ID",type=Integer.class),_x000D_
                @ColumnResult(name="USER_ID",type=Integer.class)_x000D_
            }_x000D_
        )_x000D_
    }_x000D_
)_x000D_
_x000D_
@NamedNativeQuery(name="User.getGroupDetails", query="SELECT g.*, gm.* FROM group g LEFT JOIN group_members gm ON g.group_id = gm.group_id and gm.user_id = :userId WHERE g.group_id = :groupId", resultSetMapping="groupDetailsMapping")
_x000D_
_x000D_
_x000D_

Passing properties by reference in C#

I wrote a wrapper using the ExpressionTree variant and c#7 (if somebody is interested):

public class Accessor<T>
{
    private Action<T> Setter;
    private Func<T> Getter;

    public Accessor(Expression<Func<T>> expr)
    {
        var memberExpression = (MemberExpression)expr.Body;
        var instanceExpression = memberExpression.Expression;
        var parameter = Expression.Parameter(typeof(T));

        if (memberExpression.Member is PropertyInfo propertyInfo)
        {
            Setter = Expression.Lambda<Action<T>>(Expression.Call(instanceExpression, propertyInfo.GetSetMethod(), parameter), parameter).Compile();
            Getter = Expression.Lambda<Func<T>>(Expression.Call(instanceExpression, propertyInfo.GetGetMethod())).Compile();
        }
        else if (memberExpression.Member is FieldInfo fieldInfo)
        {
            Setter = Expression.Lambda<Action<T>>(Expression.Assign(memberExpression, parameter), parameter).Compile();
            Getter = Expression.Lambda<Func<T>>(Expression.Field(instanceExpression,fieldInfo)).Compile();
        }

    }

    public void Set(T value) => Setter(value);

    public T Get() => Getter();
}

And use it like:

var accessor = new Accessor<string>(() => myClient.WorkPhone);
accessor.Set("12345");
Assert.Equal(accessor.Get(), "12345");

how to call javascript function in html.actionlink in asp.net mvc?

you need to use the htmlAttributes anonymous object, like this:

<%= Html.ActionLink("linky", "action", "controller", new { onclick = "someFunction();"}) %>

you could also give it an id an attach to it with jquery/whatever, like this:

<%= Html.ActionLink("linky", "action", "controller", new { id = "myLink" }) %>


$('#myLink').click(function() { /* bla */ });

How to convert NSDate into unix timestamp iphone sdk?

A Unix timestamp is the number of seconds since 00:00:00 UTC January 1, 1970. It's represented by the type time_t, which is usually a signed 32-bit integer type (long or int).

iOS provides -(NSTimeInterval)timeIntervalSince1970 for NSDate objects which returns the number of seconds since 00:00:00 GMT January 1, 1970. NSTimeInterval is a double floating point type so you get the seconds and fractions of a second.

Since they both have the same reference (midnight 1Jan1970 UTC) and are both in seconds the conversion is easy, convert the NSTimeInterval to a time_t, rounding or truncating depending on your needs:

time_t unixTime = (time_t) [[NSDate date] timeIntervalSince1970];

Could not find module FindOpenCV.cmake ( Error in configuration process)

  1. apt-get install libopencv-dev
  2. export OpenCV_DIR=/usr/share/OpenCV
  3. the header of cpp file should contain: #include #include "opencv2/highgui/highgui.hpp"

#include #include

not original cv.h

How to check if a line has one of the strings in a list?

This still loops through the cartesian product of the two lists, but it does it one line:

>>> lines1 = ['soup', 'butter', 'venison']
>>> lines2 = ['prune', 'rye', 'turkey']
>>> search_strings = ['a', 'b', 'c']
>>> any(s in l for l in lines1 for s in search_strings)
True
>>> any(s in l for l in lines2 for s in search_strings)
False

This also have the advantage that any short-circuits, and so the looping stops as soon as a match is found. Also, this only finds the first occurrence of a string from search_strings in linesX. If you want to find multiple occurrences you could do something like this:

>>> lines3 = ['corn', 'butter', 'apples']
>>> [(s, l) for l in lines3 for s in search_strings if s in l]
[('c', 'corn'), ('b', 'butter'), ('a', 'apples')]

If you feel like coding something more complex, it seems the Aho-Corasick algorithm can test for the presence of multiple substrings in a given input string. (Thanks to Niklas B. for pointing that out.) I still think it would result in quadratic performance for your use-case since you'll still have to call it multiple times to search multiple lines. However, it would beat the above (cubic, on average) algorithm.

C++, how to declare a struct in a header file

You can't.

In order to "use" the struct, i.e. to be able to declare objects of that type and to access its internals you need the full definition of the struct. So, it you want to do any of that (and you do, judging by your error messages), you have to place the full definition of the struct type into the header file.

Can I disable a CSS :hover effect via JavaScript?

I used the not() CSS operator and jQuery's addClass() function. Here is an example, when you click on a list item, it won't hover anymore:

For example:

HTML

<ul class="vegies">
    <li>Onion</li>
    <li>Potato</li>
    <li>Lettuce</li>
<ul>

CSS

.vegies li:not(.no-hover):hover { color: blue; }

jQuery

$('.vegies li').click( function(){
    $(this).addClass('no-hover');
});

How To Run PHP From Windows Command Line in WAMPServer

The PHP CLI as its called ( php for the Command Line Interface ) is called php.exe It lives in c:\wamp\bin\php\php5.x.y\php.exe ( where x and y are the version numbers of php that you have installed )

If you want to create php scrips to run from the command line then great its easy and very useful.

Create yourself a batch file like this, lets call it phppath.cmd :

PATH=%PATH%;c:\wamp\bin\php\phpx.y.z
php -v

Change x.y.z to a valid folder name for a version of PHP that you have installed within WAMPServer

Save this into one of your folders that is already on your PATH, so you can run it from anywhere.

Now from a command window, cd into your source folder and run >phppath.

Then run

php your_script.php

It should work like a dream.

Here is an example that configures PHP Composer and PEAR if required and they exist

@echo off

REM **************************************************************
REM * PLACE This file in a folder that is already on your PATH
REM * Or just put it in your C:\Windows folder as that is on the
REM * Search path by default
REM * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
REM * EDIT THE NEXT 3 Parameters to fit your installed WAMPServer
REM **************************************************************


set baseWamp=D:\wamp
set defaultPHPver=7.4.3
set composerInstalled=%baseWamp%\composer
set phpFolder=\bin\php\php

if %1.==. (
    set phpver=%baseWamp%%phpFolder%%defaultPHPver%
) else (
    set phpver=%baseWamp%%phpFolder%%1
)

PATH=%PATH%;%phpver%
php -v
echo ---------------------------------------------------------------


REM IF PEAR IS INSTALLED IN THIS VERSION OF PHP

IF exist %phpver%\pear (
    set PHP_PEAR_SYSCONF_DIR=%baseWamp%%phpFolder%%phpver%
    set PHP_PEAR_INSTALL_DIR=%baseWamp%%phpFolder%%phpver%\pear
    set PHP_PEAR_DOC_DIR=%baseWamp%%phpFolder%%phpver%\docs
    set PHP_PEAR_BIN_DIR=%baseWamp%%phpFolder%%phpver%
    set PHP_PEAR_DATA_DIR=%baseWamp%%phpFolder%%phpver%\data
    set PHP_PEAR_PHP_BIN=%baseWamp%%phpFolder%%phpver%\php.exe
    set PHP_PEAR_TEST_DIR=%baseWamp%%phpFolder%%phpver%\tests

    echo PEAR INCLUDED IN THIS CONFIG
    echo ---------------------------------------------------------------
) else (
    echo PEAR DOES NOT EXIST IN THIS VERSION OF php
    echo ---------------------------------------------------------------
)

REM IF A GLOBAL COMPOSER EXISTS ADD THAT TOO
REM **************************************************************
REM * IF A GLOBAL COMPOSER EXISTS ADD THAT TOO
REM *
REM * This assumes that composer is installed in /wamp/composer
REM *
REM **************************************************************
IF EXIST %composerInstalled% (
    ECHO COMPOSER INCLUDED IN THIS CONFIG
    echo ---------------------------------------------------------------
    set COMPOSER_HOME=%baseWamp%\composer
    set COMPOSER_CACHE_DIR=%baseWamp%\composer

    PATH=%PATH%;%baseWamp%\composer

    rem echo TO UPDATE COMPOSER do > composer self-update
    echo ---------------------------------------------------------------
) else (
    echo ---------------------------------------------------------------
    echo COMPOSER IS NOT INSTALLED
    echo ---------------------------------------------------------------
)

set baseWamp=
set defaultPHPver=
set composerInstalled=
set phpFolder=

Call this command file like this to use the default version of PHP

> phppath

Or to get a specific version of PHP like this

> phppath 5.6.30

Chrome disable SSL checking for sites?

Mac Users please execute the below command from terminal to disable the certificate warning.

/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --ignore-certificate-errors --ignore-urlfetcher-cert-requests &> /dev/null

Note that this will also have Google Chrome mark all HTTPS sites as insecure in the URL bar.

Does a TCP socket connection have a "keep alive"?

Now will this socket connection remain open forever or is there a timeout limit associated with it similar to HTTP keep-alive?

The short answer is no it won't remain open forever, it will probably time out after a few hours. Therefore yes there is a timeout and it is enforced via TCP Keep-Alive.

If you would like to configure the Keep-Alive timeout on your machine, see the "Changing TCP Timeouts" section below. Otherwise read through the rest of the answer to learn how TCP Keep-Alive works.

Introduction

TCP connections consist of two sockets, one on each end of the connection. When one side wants to terminate the connection, it sends an RST packet which the other side acknowledges and both close their sockets.

Until that happens, however, both sides will keep their socket open indefinitely. This leaves open the possibility that one side may close their socket, either intentionally or due to some error, without informing the other end via RST. In order to detect this scenario and close stale connections the TCP Keep Alive process is used.

Keep-Alive Process

There are three configurable properties that determine how Keep-Alives work. On Linux they are1:

  • tcp_keepalive_time
    • default 7200 seconds
  • tcp_keepalive_probes
    • default 9
  • tcp_keepalive_intvl
    • default 75 seconds

The process works like this:

  1. Client opens TCP connection
  2. If the connection is silent for tcp_keepalive_time seconds, send a single empty ACK packet.1
  3. Did the server respond with a corresponding ACK of its own?
    • No
      1. Wait tcp_keepalive_intvl seconds, then send another ACK
      2. Repeat until the number of ACK probes that have been sent equals tcp_keepalive_probes.
      3. If no response has been received at this point, send a RST and terminate the connection.
    • Yes: Return to step 2

This process is enabled by default on most operating systems, and thus dead TCP connections are regularly pruned once the other end has been unresponsive for 2 hours 11 minutes (7200 seconds + 75 * 9 seconds).

Gotchas

2 Hour Default

Since the process doesn't start until a connection has been idle for two hours by default, stale TCP connections can linger for a very long time before being pruned. This can be especially harmful for expensive connections such as database connections.

Keep-Alive is Optional

According to RFC 1122 4.2.3.6, responding to and/or relaying TCP Keep-Alive packets is optional:

Implementors MAY include "keep-alives" in their TCP implementations, although this practice is not universally accepted. If keep-alives are included, the application MUST be able to turn them on or off for each TCP connection, and they MUST default to off.

...

It is extremely important to remember that ACK segments that contain no data are not reliably transmitted by TCP.

The reasoning being that Keep-Alive packets contain no data and are not strictly necessary and risk clogging up the tubes of the interwebs if overused.

In practice however, my experience has been that this concern has dwindled over time as bandwidth has become cheaper; and thus Keep-Alive packets are not usually dropped. Amazon EC2 documentation for instance gives an indirect endorsement of Keep-Alive, so if you're hosting with AWS you are likely safe relying on Keep-Alive, but your mileage may vary.

Changing TCP Timeouts

Per Socket

Unfortunately since TCP connections are managed on the OS level, Java does not support configuring timeouts on a per-socket level such as in java.net.Socket. I have found some attempts3 to use Java Native Interface (JNI) to create Java sockets that call native code to configure these options, but none appear to have widespread community adoption or support.

Instead, you may be forced to apply your configuration to the operating system as a whole. Be aware that this configuration will affect all TCP connections running on the entire system.

Linux

The currently configured TCP Keep-Alive settings can be found in

  • /proc/sys/net/ipv4/tcp_keepalive_time
  • /proc/sys/net/ipv4/tcp_keepalive_probes
  • /proc/sys/net/ipv4/tcp_keepalive_intvl

You can update any of these like so:

# Send first Keep-Alive packet when a TCP socket has been idle for 3 minutes
$ echo 180 > /proc/sys/net/ipv4/tcp_keepalive_time
# Send three Keep-Alive probes...
$ echo 3 > /proc/sys/net/ipv4/tcp_keepalive_probes
# ... spaced 10 seconds apart.
$ echo 10 > /proc/sys/net/ipv4/tcp_keepalive_intvl

Such changes will not persist through a restart. To make persistent changes, use sysctl:

sysctl -w net.ipv4.tcp_keepalive_time=180 net.ipv4.tcp_keepalive_probes=3 net.ipv4.tcp_keepalive_intvl=10

Mac OS X

The currently configured settings can be viewed with sysctl:

$ sysctl net.inet.tcp | grep -E "keepidle|keepintvl|keepcnt"
net.inet.tcp.keepidle: 7200000
net.inet.tcp.keepintvl: 75000
net.inet.tcp.keepcnt: 8

Of note, Mac OS X defines keepidle and keepintvl in units of milliseconds as opposed to Linux which uses seconds.

The properties can be set with sysctl which will persist these settings across reboots:

sysctl -w net.inet.tcp.keepidle=180000 net.inet.tcp.keepcnt=3 net.inet.tcp.keepintvl=10000

Alternatively, you can add them to /etc/sysctl.conf (creating the file if it doesn't exist).

$ cat /etc/sysctl.conf
net.inet.tcp.keepidle=180000
net.inet.tcp.keepintvl=10000
net.inet.tcp.keepcnt=3

Windows

I don't have a Windows machine to confirm, but you should find the respective TCP Keep-Alive settings in the registry at

\HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\TCPIP\Parameters

Footnotes

1. See man tcp for more information.

2. This packet is often referred to as a "Keep-Alive" packet, but within the TCP specification it is just a regular ACK packet. Applications like Wireshark are able to label it as a "Keep-Alive" packet by meta-analysis of the sequence and acknowledgement numbers it contains in reference to the preceding communications on the socket.

3. Some examples I found from a basic Google search are lucwilliams/JavaLinuxNet and flonatel/libdontdie.

Finding the average of an array using JS

var total = 0
grades.forEach(function (grade) {
    total += grade        
});
console.log(total / grades.length)

Why am I getting "void value not ignored as it ought to be"?

  int a = srand(time(NULL));

The prototype for srand is void srand(unsigned int) (provided you included <stdlib.h>).
This means it returns nothing ... but you're using the value it returns (???) to assign, by initialization, to a.


Edit: this is what you need to do:

#include <stdlib.h> /* srand(), rand() */
#include <time.h>   /* time() */

#define ARRAY_SIZE 1024

void getdata(int arr[], int n)
{
    for (int i = 0; i < n; i++)
    {
        arr[i] = rand();
    }
}

int main(void)
{
    int arr[ARRAY_SIZE];
    srand(time(0));
    getdata(arr, ARRAY_SIZE);
    /* ... */
}

'numpy.float64' object is not iterable

numpy.linspace() gives you a one-dimensional NumPy array. For example:

>>> my_array = numpy.linspace(1, 10, 10)
>>> my_array
array([  1.,   2.,   3.,   4.,   5.,   6.,   7.,   8.,   9.,  10.])

Therefore:

for index,point in my_array

cannot work. You would need some kind of two-dimensional array with two elements in the second dimension:

>>> two_d = numpy.array([[1, 2], [4, 5]])
>>> two_d
array([[1, 2], [4, 5]])

Now you can do this:

>>> for x, y in two_d:
    print(x, y)

1 2
4 5

Uncaught ReferenceError: React is not defined

I was facing the same issue. I resolved it by importing React and ReactDOM like as follows:

import React from 'react';
import ReactDOM from 'react-dom';

Angular ng-repeat add bootstrap row every 3 or 4 cols

Okay, this solution is far simpler than the ones already here, and allows different column widths for different device widths.

<div class="row">
    <div ng-repeat="image in images">
        <div class="col-xs-6 col-sm-4 col-md-3 col-lg-2">
            ... your content here ...
        </div>
        <div class="clearfix visible-lg" ng-if="($index + 1) % 6 == 0"></div>
        <div class="clearfix visible-md" ng-if="($index + 1) % 4 == 0"></div>
        <div class="clearfix visible-sm" ng-if="($index + 1) % 3 == 0"></div>
        <div class="clearfix visible-xs" ng-if="($index + 1) % 2 == 0"></div>
    </div>
</div>

Note that the % 6 part is supposed to equal the number of resulting columns. So if on the column element you have the class col-lg-2 there will be 6 columns, so use ... % 6.

This technique (excluding the ng-if) is actually documented here: Bootstrap docs

a href link for entire div in HTML/CSS

Going off of what Surreal Dreams said, it's probably best to style the anchor tag in my experience, but it really does depend on what you are doing. Here's an example:

Html:

<div class="parent-div">
  <a href="#">Test</a>
  <a href="#">Test</a>
  <a href="#">Test</a>
</div>

Then the CSS:

.parent-div {
  width: 200px;
}
a {
  display:block;
  background-color: #ccc;
  color: #000;
  text-decoration:none;
  padding:10px;
  margin-bottom:1px;
}
a:hover {
  background-color: #ddd;
}

http://jsbin.com/zijijuduqo/1/edit?html,css,output

How to configure CORS in a Spring Boot + Spring Security application?

Cross origin protection is a feature of the browser. Curl does not care for CORS, as you presumed. That explains why your curls are successful, while the browser requests are not.

If you send the browser request with the wrong credentials, spring will try to forward the client to a login page. This response (off the login page) does not contain the header 'Access-Control-Allow-Origin' and the browser reacts as you describe.

You must make spring to include the haeder for this login response, and may be for other response, like error pages etc.

This can be done like this :

    @Configuration
    @EnableWebMvc
    public class WebConfig extends WebMvcConfigurerAdapter {

            @Override
            public void addCorsMappings(CorsRegistry registry) {
                registry.addMapping("/api/**")
                    .allowedOrigins("http://domain2.com")
                    .allowedMethods("PUT", "DELETE")
                    .allowedHeaders("header1", "header2", "header3")
                    .exposedHeaders("header1", "header2")
                    .allowCredentials(false).maxAge(3600);
            }
     }

This is copied from cors-support-in-spring-framework

I would start by adding cors mapping for all resources with :

registry.addMapping("/**")

and also allowing all methods headers.. Once it works you may start to reduce that again to the needed minimum.

Please note, that the CORS configuration changes with Release 4.2.

If this does not solve your issues, post the response you get from the failed ajax request.

Passing arrays as parameters in bash

Note: This is the somewhat crude solution I posted myself, after not finding an answer here on Stack Overflow. It allows for only one array being passed, and it being the last element of the parameter list. Actually, it is not passing the array at all, but a list of its elements, which are re-assembled into an array by called_function(), but it worked for me. Somewhat later Ken posted his solution, but I kept mine here for "historic" reference.

calling_function()
{
    variable="a"
    array=( "x", "y", "z" )
    called_function "${variable}" "${array[@]}"
}

called_function()
{
    local_variable="${1}"
    shift
    local_array=("${@}")
}

Disable all table constraints in Oracle

SELECT 'ALTER TABLE '||substr(c.table_name,1,35)|| 
' DISABLE CONSTRAINT '||constraint_name||' ;' 
FROM user_constraints c, user_tables u 
WHERE c.table_name = u.table_name; 

This statement returns the commands which turn off all the constraints including primary key, foreign keys, and another constraints.

On duplicate key ignore?

Mysql has this handy UPDATE INTO command ;)

edit Looks like they renamed it to REPLACE

REPLACE works exactly like INSERT, except that if an old row in the table has the same value as a new row for a PRIMARY KEY or a UNIQUE index, the old row is deleted before the new row is inserted

Git: add vs push vs commit

  • git add adds files to the Git index, which is a staging area for objects prepared to be commited.
  • git commit commits the files in the index to the repository, git commit -a is a shortcut to add all the modified tracked files to the index first.
  • git push sends all the pending changes to the remote repository to which your branch is mapped (eg. on GitHub).

In order to understand Git you would need to invest more effort than just glancing over the documentation, but it's definitely worth it. Just don't try to map Git commands directly to Subversion, as most of them don't have a direct counterpart.

How to export data with Oracle SQL Developer?

If, at some point, you only need to export a single result set, just right click "on the data" (any column of any row) there you will find an export option. The wizard exports the complete result set regardless of what you selected

Jenkins: Is there any way to cleanup Jenkins workspace?

Beside above solutions, there is a more "COMMON" way - directly delete the largest space consumer from Linux machine. You can follow the below steps:

  1. Login to Jenkins machine (Putty) enter image description here
  2. cd to the Jenkins installation path

Using ls -lart to list out hidden folder also, normally jenkin installation is placed in .jenkins/ folder

[xxxxx ~]$ ls -lart

drwxrwxr-x 12 xxxx  4096 Feb  8 02:08 .jenkins/
  1. list out the folders spaces

Use df -h to show Disk space in high level

du -sh ./*/ to list out total memory for each subfolder in current path.

du -a /etc/ | sort -n -r | head -n 10 will list top 10 directories eating disk space in /etc/

  1. Delete old build or other large size folder

Normally ./job/ folder or ./workspace/ folder can be the largest folder. Please go inside and delete base on you need (DO NOT delete entire folder).

rm -rf theFolderToDelete

enter image description here

RestClientException: Could not extract response. no suitable HttpMessageConverter found

I was having a very similar problem, and it turned out to be quite simple; my client wasn't including a Jackson dependency, even though the code all compiled correctly, the auto-magic converters for JSON weren't being included. See this RestTemplate-related solution.

In short, I added a Jackson dependency to my pom.xml and it just worked:

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.5.1</version>
</dependency>

MySQL and PHP - insert NULL rather than empty string

If you don't pass values, you'll get nulls for defaults.

But you can just pass the word NULL without quotes.

AngularJS: Uncaught Error: [$injector:modulerr] Failed to instantiate module?

I had to change the js file, so to include "function()" at the beginning of it, and also "()" at the end line. That solved the problem

Is there a way to compile node.js source files?

javascript does not not have a compiler like for example Java/C(You can compare it more to languages like PHP for example). If you want to write compiled code you should read the section about addons and learn C. Although this is rather complex and I don't think you need to do this but instead just write javascript.

Return value of x = os.system(..)

os.system() returns the (encoded) process exit value. 0 means success:

On Unix, the return value is the exit status of the process encoded in the format specified for wait(). Note that POSIX does not specify the meaning of the return value of the C system() function, so the return value of the Python function is system-dependent.

The output you see is written to stdout, so your console or terminal, and not returned to the Python caller.

If you wanted to capture stdout, use subprocess.check_output() instead:

x = subprocess.check_output(['whoami'])

Is there a way to use PhantomJS in Python?

PhantomJS recently dropped Python support altogether. However, PhantomJS now embeds Ghost Driver.

A new project has since stepped up to fill the void: ghost.py. You probably want to use that instead:

from ghost import Ghost
ghost = Ghost()

with ghost.start() as session:
    page, extra_resources = ghost.open("http://jeanphi.me")
    assert page.http_status==200 and 'jeanphix' in ghost.content

sscanf in Python

You could install pandas and use pandas.read_fwf for fixed width format files. Example using /proc/net/arp:

In [230]: df = pandas.read_fwf("/proc/net/arp")

In [231]: print(df)
       IP address HW type Flags         HW address Mask Device
0   141.38.28.115     0x1   0x2  84:2b:2b:ad:e1:f4    *   eth0
1   141.38.28.203     0x1   0x2  c4:34:6b:5b:e4:7d    *   eth0
2   141.38.28.140     0x1   0x2  00:19:99:ce:00:19    *   eth0
3   141.38.28.202     0x1   0x2  90:1b:0e:14:a1:e3    *   eth0
4    141.38.28.17     0x1   0x2  90:1b:0e:1a:4b:41    *   eth0
5    141.38.28.60     0x1   0x2  00:19:99:cc:aa:58    *   eth0
6   141.38.28.233     0x1   0x2  90:1b:0e:8d:7a:c9    *   eth0
7    141.38.28.55     0x1   0x2  00:19:99:cc:ab:00    *   eth0
8   141.38.28.224     0x1   0x2  90:1b:0e:8d:7a:e2    *   eth0
9   141.38.28.148     0x1   0x0  4c:52:62:a8:08:2c    *   eth0
10  141.38.28.179     0x1   0x2  90:1b:0e:1a:4b:50    *   eth0

In [232]: df["HW address"]
Out[232]:
0     84:2b:2b:ad:e1:f4
1     c4:34:6b:5b:e4:7d
2     00:19:99:ce:00:19
3     90:1b:0e:14:a1:e3
4     90:1b:0e:1a:4b:41
5     00:19:99:cc:aa:58
6     90:1b:0e:8d:7a:c9
7     00:19:99:cc:ab:00
8     90:1b:0e:8d:7a:e2
9     4c:52:62:a8:08:2c
10    90:1b:0e:1a:4b:50

In [233]: df["HW address"][5]
Out[233]: '00:19:99:cc:aa:58'

By default it tries to figure out the format automagically, but there are options you can give for more explicit instructions (see documentation). There are also other IO routines in pandas that are powerful for other file formats.

Android: How to bind spinner to custom object list?

Just a small tweak to Joaquin Alberto's answer can solve the style issue.Just replace the getDropDownView function in the custom adapter as below,

@Override
    public View getDropDownView(int position, View convertView, ViewGroup parent) {
        View v = super.getDropDownView(position, convertView, parent);
        TextView tv = ((TextView) v);
        tv.setText(values[position].getName());
        tv.setTextColor(Color.BLACK);
        return v;
    }

How can I create a table with borders in Android?

I know this is an old question ... anyway ... if you want to keep your xml nice and simple you can extend TableLayout and override dispatchDraw to do some custom drawing.

Here is a quick and dirty implementation that draws a rectangle around the table view as well as horizontal and verticals bars:

public class TableLayoutEx extends TableLayout {
    private Paint linePaint = null;
    private Rect tableLayoutRect;

    public TableLayoutEx(Context context) {
        super(context);
    }

    public TableLayoutEx(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);

        float strokeWidth = this.getContext().getResources().getDisplayMetrics().scaledDensity * 1;
        linePaint = new Paint(0);
        linePaint.setColor(0xff555555);
        linePaint.setStrokeWidth(strokeWidth);
        linePaint.setStyle(Paint.Style.STROKE);

        Rect rect = new Rect();           
        int paddingTop= getPaddingTop();

        this.getDrawingRect(rect);
        tableLayoutRect = new Rect(rect.left, rect.top + paddingTop, rect.right, rect.bottom);
    }

    @Override
    protected void dispatchDraw(Canvas canvas) {
        super.dispatchDraw(canvas);

        Rect rect = new Rect();

        if (linePaint != null) {
            canvas.drawRect(tableLayoutRect, linePaint);
            float y = tableLayoutRect.top;
            for (int i = 0; i < getChildCount() - 1; i++) {
                if (getChildAt(i) instanceof TableRow) {
                    TableRow tableRow = (TableRow) getChildAt(i);
                    tableRow.getDrawingRect(rect);
                    y += rect.height();
                    canvas.drawLine(tableLayoutRect.left, y, tableLayoutRect.right, y, linePaint);
                    float x = tableLayoutRect.left;
                    for (int j = 0; j < tableRow.getChildCount() - 1; j++) {
                        View view = tableRow.getChildAt(j);
                        if (view != null) {
                            view.getDrawingRect(rect);
                            x += rect.width();
                            canvas.drawLine(x, tableLayoutRect.top, x, tableLayoutRect.bottom, linePaint);
                        }
                    }
                }
            }
        }
    }
}

xml example with the third column wrapping text:

<com.YOURPACKAGE.TableLayoutEx
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:shrinkColumns="2"
    android:paddingTop="6dp">

    <TableRow>
        <TextView
            android:text="@string/my_text_0_0"
            android:padding="@dimen/my_padding"/>
        <TextView
            android:text="@string/my_text_0_1"
            android:padding="@dimen/my_padding"/>
        <TextView                   
            android:text="@string/my_text_0_2_to_wrap"
            android:padding="@dimen/my_padding"/>
    </TableRow>

    <!--more table rows here-->

</com.YOURPACKAGE.TableLayoutEx>

iterating quickly through list of tuples

The code can be cleaned up, but if you are using a list to store your tuples, any such lookup will be O(N).

If lookup speed is important, you should use a dict to store your tuples. The key should be the 0th element of your tuples, since that's what you're searching on. You can easily create a dict from your list:

my_dict = dict(my_list)

Then, (VALUE, my_dict[VALUE]) will give you your matching tuple (assuming VALUE exists).

excel plot against a date time x series

[excel 2010] separate the date and time into separate columns and select both as X-Axis and data as graph series see http://www.79783.mrsite.com/USERIMAGES/horizontal_axis_date_and_time2.xlsx

Why does this CSS margin-top style not work?

Try using display: inline-block; on the inner div.

#outer {
    width:500px; 
    height:200px; 
    background:#FFCCCC;
    margin:50px auto 0 auto;
    display:block;
}
#inner {
    background:#FFCC33;
    margin:50px 50px 50px 50px;
    padding:10px;
    display:inline-block;
}

Sending a notification from a service in Android

If none of these work, try getBaseContext(), instead of context or this.

SELECT with a Replace()

You have to repeat your expression everywhere you want to use it:

SELECT Replace(Postcode, ' ', '') AS P
FROM Contacts
WHERE Replace(Postcode, ' ', '') LIKE 'NW101%'

or you can make it a subquery

select P
from (
SELECT Replace(Postcode, ' ', '') AS P
FROM Contacts
) t
WHERE P LIKE 'NW101%'

Command-line Git on Windows

I had the same issue and resolved it by adding the /bin directory location to the PATH Environment Variable.

  1. Search for the file location where Git was installed, mine is C:\Users\(My UserName)\AppData\Local\GitHub. It may also be C:\Program Files (x86)\Git

  2. Once you have the location of Git you should see a /bin sub-folder. It may be in a PortableGit folder (mine is PortableGit_015aa71ef18c047ce8509ffb2f9e4bb0e3e73f13). Copy this path.

  3. Go to Control Panel > System > System Protection > Advanced > Environment Variables

  4. Choose PATH, click edit and paste the bin path there. If there are already any values in your PATH paste your Git path at the end separated with a semi-colon.

Now you can access Git command from CMD.

Angular.js How to change an elements css class on click and to remove all others

To me it seems like the best solution is to use a directive; there's no need for the controller to know that the view is being updated.

Javascript:

var app = angular.module('app', ['directives']);

angular.module('directives', []).directive('toggleClass', function () {
    var directiveDefinitionObject = {
        restrict: 'A',
        template: '<span ng-click="localFunction()" ng-class="selected"  ng-transclude></span>',
        replace: true,
        scope: {
            model: '='
        },
        transclude: true,
        link: function (scope, element, attrs) {
            scope.localFunction = function () {
                scope.model.value = scope.$id;
            };
            scope.$watch('model.value', function () {
                // Is this set to my scope?
                if (scope.model.value === scope.$id) {
                    scope.selected = "active";
                } else {
                    // nope
                    scope.selected = '';
                }
            });
        }
    };
    return directiveDefinitionObject;
});

HTML:

<div ng-app="app" ng-init="model = { value: 'dsf'}"> <span>Click a span... then click another</span>

<br/>
<br/>
<span toggle-class model="model">span1</span>

<br/><span toggle-class model="model">span2</span>

<br/><span toggle-class model="model">span3</span>

CSS:

.active {
     color:red;
 }

I have a fiddle that demonstrates. The idea is when a directive is clicked, a function is called on the directive that sets a variable to the current scope id. Then each directive also watches the same value. If the scope ID's match, then the current element is set to be active using ng-class.

The reason to use directives, is that you no longer are dependent on a controller. In fact I don't have a controller at all (I do define a variable in the view named "model"). You can then reuse this directive anywhere in your project, not just on one controller.

Multiple Updates in MySQL

Yes ..it is possible using INSERT ON DUPLICATE KEY UPDATE sql statement.. syntax: INSERT INTO table_name (a,b,c) VALUES (1,2,3),(4,5,6) ON DUPLICATE KEY UPDATE a=VALUES(a),b=VALUES(b),c=VALUES(c)

VB.NET Empty String Array

A little verbose, but self documenting...

Dim strEmpty() As String = Enumerable.Empty(Of String).ToArray

How can one print a size_t variable portably using the printf family?

std::size_t s = 1024;
std::cout << s; // or any other kind of stream like stringstream!

How to insert element as a first child?

parentNode.insertBefore(newChild, refChild)

Inserts the node newChild as a child of parentNode before the existing child node refChild. (Returns newChild.)

If refChild is null, newChild is added at the end of the list of children. Equivalently, and more readably, use parentNode.appendChild(newChild).

Asp.net MVC ModelState.Clear

Well, this seemed to work on my Razor Page and never even did a round trip to the .cs file. This is old html way. It might be useful.

<input type="reset" value="Reset">

Give all permissions to a user on a PostgreSQL database

GRANT ALL PRIVILEGES ON DATABASE "my_db" to my_user;

A CORS POST request works from plain JavaScript, but why not with jQuery?

Another possibility is that setting dataType: json causes JQuery to send the Content-Type: application/json header. This is considered a non-standard header by CORS, and requires a CORS preflight request. So a few things to try:

1) Try configuring your server to send the proper preflight responses. This will be in the form of additional headers like Access-Control-Allow-Methods and Access-Control-Allow-Headers.

2) Drop the dataType: json setting. JQuery should request Content-Type: application/x-www-form-urlencoded by default, but just to be sure, you can replace dataType: json with contentType: 'application/x-www-form-urlencoded'

extract column value based on another column pandas dataframe

You could use loc to get series which satisfying your condition and then iloc to get first element:

In [2]: df
Out[2]:
    A  B
0  p1  1
1  p1  2
2  p3  3
3  p2  4

In [3]: df.loc[df['B'] == 3, 'A']
Out[3]:
2    p3
Name: A, dtype: object

In [4]: df.loc[df['B'] == 3, 'A'].iloc[0]
Out[4]: 'p3'

How to create a cron job using Bash automatically without the interactive editor?

You can probably change the default editor to ed and use a heredoc to edit.

EDITOR=ed
export EDITOR

crontab -e << EOF
> a
> * * * * * Myscript
> * * * * * AnotherScript
> * * * * * MoreScript
> .
> w
> q
> EOF

Note the leading > in that code means the return/enter key is pressed to create a new line.

The a means APPEND so it will not overwrite anything.

The . means you're done editing.

The w means WRITE the changes.

The q means QUIT or exit ed.

you can check it out

crontab -l

You can delete an entry too.

EDITOR=ed
export EDITOR

crontab -e << EOF
> /Myscript/
> d
> .
> w
> q
> EOF

That will delete the crontab entry with Myscript in it.

The d means delete the pattern inside the / /.

No check it again

crontab -l

This solution works inside a script too less the > of course :-)

Event handler not working on dynamic content

You are missing the selector in the .on function:

.on(eventType, selector, function)

This selector is very important!

http://api.jquery.com/on/

If new HTML is being injected into the page, select the elements and attach event handlers after the new HTML is placed into the page. Or, use delegated events to attach an event handler

See jQuery 1.9 .live() is not a function for more details.

Difference between margin and padding?

My understanding of margin and padding comes from google's developer tool in the image attachedenter image description here

In Simple words, a margin is the space around an element and padding means the space between an element and the content inside that element. Both these two are used to create gaps but in different ways.

Using Margin to create gap:

In creating gap margin pushes the adjacent elements away

Using Padding to create gap:

Using padding to create gap either grows the element's size or shrinks the content inside

Why is it important to know the difference?

It is important to know the difference so you could know when to use either of them and use them appropriately.

It is also worthy of note that margins and padding come handy when designing a website's layout, as margin specifies whether an element will move up or down, left or right while padding specifies how an element will look and sit inside its container.

Change MySQL default character set to UTF-8 in my.cnf?

MySQL versions and Linux distributions may matter when making configurations.

However, the changes under [mysqld] section is encouraged.

I want to give a short explanation of tomazzlender's answer:

[mysqld] 
init_connect='SET collation_connection = utf8_unicode_ci' 
init_connect='SET NAMES utf8' 
character-set-server=utf8 
collation-server=utf8_unicode_ci 
skip-character-set-client-handshake

[mysqld]

This will change collation_connection to utf8_unicode_ci

init_connect='SET collation_connection = utf8_unicode_ci'

Using SET NAMES:

init_connect='SET NAMES utf8'

The SET NAMES will influence three characters, that is:

character_set_client
character_set_results
character_set_connection

This will set character_set_database & character_set_server

character-set-server=utf8

This will only affect collation_database & collation_server

collation-server=utf8_unicode_ci

Sorry, I'm not so sure what is this for. I don't use it however:

skip-character-set-client-handshake

error: ‘NULL’ was not declared in this scope

NULL is not a keyword. It's an identifier defined in some standard headers. You can include

#include <cstddef>

To have it in scope, including some other basics, like std::size_t.

Check if datetime instance falls in between other two datetime objects

DateTime.Ticks will account for the time. Use .Ticks on the DateTime to convert your dates into longs. Then just use a simple if stmt to see if your target date falls between.

// Assuming you know d2 > d1
if (targetDt.Ticks > d1.Ticks && targetDt.Ticks < d2.Ticks)
{
    // targetDt is in between d1 and d2
}  

How to transfer data from JSP to servlet when submitting HTML form

first up on create your jsp file : and write the text field which you want
for ex:

after that create your servlet class:

public class test{

protected void doGet(paramter , paramter){

String name  = request.getparameter("name");
 }

}

Regular expression to extract numbers from a string

you could use something like:

[^0-9]+([0-9]+)[^0-9]+([0-9]+).+

Then get the first and second capture groups.

Find a value anywhere in a database

Database client tools (like DBeaver or phpMyAdmin) often support means of fulltext search through entire database.

Rename multiple files in cmd

This works for your specific case:

ren file?.txt "file? 1.1.txt" 

calculating execution time in c++

OVERVIEW

I have written a simple semantic hack for this using @AshutoshMehraresponse. You code looks really readable this way!

MACRO

#include <time.h>

#ifndef SYSOUT_F
#define SYSOUT_F(f, ...)      _RPT1( 0, f, __VA_ARGS__ ) // For Visual studio
#endif

#ifndef speedtest__             
#define speedtest__(data)   for (long blockTime = NULL; (blockTime == NULL ? (blockTime = clock()) != NULL : false); SYSOUT_F(data "%.9fs", (double) (clock() - blockTime) / CLOCKS_PER_SEC))
#endif

USAGE

speedtest__("Block Speed: ")
{
    // The code goes here
}

OUTPUT

Block Speed: 0.127000000s

Convert Pixels to Points

Using wxPython on Mac to get the correct DPI as follows:

    from wx import ScreenDC
    from wx import Size

    size: Size = ScreenDC().GetPPI()
    print(f'x-DPI: {size.GetWidth()} y-DPI: {size.GetHeight()}')

This yields:

x-DPI: 72 y-DPI: 72

Thus, the formula is:

points: int = (pixelNumber * 72) // 72

Xcode 4: create IPA file instead of .xcarchive

Creating an IPA is done along the same way as creating an .xcarchive: Product -> Archive. After the Archive operation completes, go to the Organizer, select your archive, select Share and in the "Select the content and options for sharing:" pane set Contents to "iOS App Store Package (.ipa) and Identity to iPhone Distribution (which should match your ad hoc/app store provisioning profile for the project).

Chances are the "iOS App Store Package (.ipa)" option may be disabled. This happens when your build produces more than a single target: say, an app and a library. All of them end up in the build products folder and Xcode gets naïvely confused about how to package them both into an .ipa file, so it merely disables the option.

A way to solve this is as follows: go through build settings for each of the targets, except the application target, and set Skip Install flag to YES. Then do the Product -> Archive tango once again and go to the Organizer to select your new archive. Now, when clicking on the Share button, the .ipa option should be enabled.

I hope this helps.

What size should TabBar images be?

According to my practice, I use the 40 x 40 for standard iPad tab bar item icon, 80 X 80 for retina.

From the Apple reference. https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/MobileHIG/BarIcons.html#//apple_ref/doc/uid/TP40006556-CH21-SW1

If you want to create a bar icon that looks like it's related to the iOS 7 icon family, use a very thin stroke to draw it. Specifically, a 2-pixel stroke (high resolution) works well for detailed icons and a 3-pixel stroke works well for less detailed icons.

Regardless of the icon’s visual style, create a toolbar or navigation bar icon in the following sizes:

About 44 x 44 pixels About 22 x 22 pixels (standard resolution) Regardless of the icon’s visual style, create a tab bar icon in the following sizes:

About 50 x 50 pixels (96 x 64 pixels maximum) About 25 x 25 pixels (48 x 32 pixels maximum) for standard resolution

How can I determine installed SQL Server instances and their versions?

From Windows command-line, type:

SC \\server_name query | find /I "SQL Server ("

Where "server_name" is the name of any remote server on which you wish to display the SQL instances.

This requires enough permissions of course.

jQuery click event not working in mobile browsers

Raminson has a nice answer if you are already (or don't mind) using jQuery Mobile. If you want a different solution, why not just modify your code as follows:

change that LI you're having trouble with to include an A tag and apply the class there instead of the LI

<!-- This is the main menu -->
<ul class="menu">
   <li><a href="/home/">HOME</a></li>
   <li><a href="#" class="publications">PUBLICATIONS &amp; PROJECTS</a></li>
   <li><a href="/about/">ABOUT</a></li>
   <li><a href="/blog/">BLOG</a></li>
   <li><a href="/contact/">CONTACT</a></li>
 </ul>

And your javascript/jquery code... return false to stop bubbling.

$(document).ready(function(){
   $('.publications').click(function() {
       $('#filter_wrapper').show();
       return false;
   });
 });

This should work for what you are trying to do.

Also, I noticed your site opens the other links in new tabs/windows, is that intentional?

Iterate over elements of List and Map using JSTL <c:forEach> tag

try this

<c:forEach items="${list}" var="map">
    <tr>
        <c:forEach items="${map}" var="entry">

            <td>${entry.value}</td>

        </c:forEach>
    </tr>
</c:forEach>

What is the difference between the HashMap and Map objects in Java?

HashMap is an implementation of Map so it's quite the same but has "clone()" method as i see in reference guide))

how to get request path with express req object

In some cases you should use:

req.path

This gives you the path, instead of the complete requested URL. For example, if you are only interested in which page the user requested and not all kinds of parameters the url:

/myurl.htm?allkinds&ofparameters=true

req.path will give you:

/myurl.html

Make more than one chart in same IPython Notebook cell

Another way, for variety. Although this is somewhat less flexible than the others. Unfortunately, the graphs appear one above the other, rather than side-by-side, which you did request in your original question. But it is very concise.

df.plot(subplots=True)

If the dataframe has more than the two series, and you only want to plot those two, you'll need to replace df with df[['korisnika','osiguranika']].

Refresh an asp.net page on button click

On button click you can try the following.

protected void button1_Click(object sender, EventArgs e)
{
     Response.Redirect("~/Admin/Admin.aspx");
}

And on PageLoad you can check whether the loading is coming from that button then increase the count.

       protected void Page_Load(object sender, EventArgs e)
         {
            StackTrace stackTrace = new StackTrace();
            string eventName = stackTrace.GetFrame(1).GetMethod().Name; // this will the event name.
            if (eventName == "button1_Click")
              {
                // code to increase the count;
              }
          }

Thanks

Open soft keyboard programmatically

Put that in onResume method:

findViewById(R.id.root_view_of_your_activity_layout).post(
new Runnable() {
    public void run() {
        InputMethodManager inputMethodManager =  (InputMethodManager)getSystemService(INPUT_METHOD_SERVICE);
        inputMethodManager.toggleSoftInputFromWindow(yourEditText.getApplicationWindowToken(),     InputMethodManager.SHOW_FORCED, 0);
        yourEditText.requestFocus();
    }
});

the runnable is needed because when the OS fires the onResume method you can't be sure that all the views where draw, so the post method called from your root layout makes it wait till every view is ready.

How to make bootstrap column height to 100% row height?

You can solve that using display table.

Here is the updated JSFiddle that solves your problem.

CSS

.body {
    display: table;
    background-color: green;
}

.left-side {
    background-color: blue;
    float: none;
    display: table-cell;
    border: 1px solid;
}

.right-side {
    background-color: red;
    float: none;
    display: table-cell;
    border: 1px solid;
}

HTML

<div class="row body">
        <div class="col-xs-9 left-side">
            <p>sdfsdf</p>
            <p>sdfsdf</p>
            <p>sdfsdf</p>
            <p>sdfsdf</p>
            <p>sdfsdf</p>
            <p>sdfsdf</p>
        </div>
        <div class="col-xs-3 right-side">
            asdfdf
        </div>
    </div>

Limit the output of the TOP command to a specific process name

I run it (eg.): top -b | egrep -w 'java|mysqld'

How to return a dictionary | Python


def query(id):
    for line in file:
        table = line.split(";")
        if id == int(table[0]):
             yield table
    
    

id = int(input("Enter the ID of the user: "))
for id_, name, city in query(id):
  print("ID: " + id_)
  print("Name: " + name)
  print("City: " + city)
file.close()

Using yield..

In SSRS, why do I get the error "item with same key has already been added" , when I'm making a new report?

I face the same issue. After debug I fixed the same. if the column name in your sql query has multiple times then this issue occur. Hence use alias in sql query to differ the column name. Ex: The below query will work proper in sql query but create issue in SSRS report:

Select P.ID, P.FirstName, P.LastName, D.ID, D.City, D.Area, D.Address From PersonalDetails P Left Join CommunicationDetails D On P.ID = D.PersonalDetailsID

Reason : ID has mentioned twice (Multiple Times)

Correct Query:

Select P.ID As PersonalDetailsID, P.FirstName, P.LastName, D.ID, D.City, D.Area, D.Address From PersonalDetails P Left Join CommunicationDetails D On P.ID = D.PersonalDetailsID

Value Change Listener to JTextField

Add a listener to the underlying Document, which is automatically created for you.

// Listen for changes in the text
textField.getDocument().addDocumentListener(new DocumentListener() {
  public void changedUpdate(DocumentEvent e) {
    warn();
  }
  public void removeUpdate(DocumentEvent e) {
    warn();
  }
  public void insertUpdate(DocumentEvent e) {
    warn();
  }

  public void warn() {
     if (Integer.parseInt(textField.getText())<=0){
       JOptionPane.showMessageDialog(null,
          "Error: Please enter number bigger than 0", "Error Message",
          JOptionPane.ERROR_MESSAGE);
     }
  }
});

how to create dynamic two dimensional array in java?

One more example for 2 dimension String array:

public void arrayExam() {
    List<String[]> A = new ArrayList<String[]>();
    A.add(new String[] {"Jack","good"});
    A.add(new String[] {"Mary","better"});
    A.add(new String[] {"Kate","best"});
    for (String[] row : A) {
        Log.i(TAG,row[0] + "->" + row[1]);
    }
}

Output:

17467 08-02 19:24:40.518  8456  8456 I MyExam  : Jack->good
17468 08-02 19:24:40.518  8456  8456 I MyExam  : Mary->better
17469 08-02 19:24:40.518  8456  8456 I MyExam  : Kate->best

Size of character ('a') in C/C++

As Paul stated, it's because 'a' is an int in C but a char in C++.

I cover that specific difference between C and C++ in something I wrote a few years ago, at: http://david.tribble.com/text/cdiffs.htm

Localhost not working in chrome and firefox

In case the browser LAN proxy setting solution doesn't work for you:

As mentioned in this similar Q&A How to solve ERR_CONNECTION_REFUSED when trying to connect to localhost running IISExpress - Error 502 (Cannot debug from Visual Studio)?

Simply changing the port number of your web project can be a quick fix.

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