How can I see the raw SQL queries Django is running?

Just to add, in django, if you have a query like:

MyModel.objects.all()

do:

MyModel.objects.all().query.sql_with_params()

or:

str(MyModel.objects.all().query)

to get the sql string

HTML / CSS table with GRIDLINES

Via css. Put this inside the <head> tag.

<style type="text/css" media="screen">

table{
border-collapse:collapse;
border:1px solid #FF0000;
}

table td{
border:1px solid #FF0000;
}
</style>

How to catch and print the full exception traceback without halting/exiting the program?

This is my solution to write the error in a log file and also on console:

import logging, sys
import traceback
logging.basicConfig(filename='error.log', level=logging.DEBUG)

def handle_exception(exc_type, exc_value, exc_traceback):
    import sys
    if issubclass(exc_type, KeyboardInterrupt):
        sys.__excepthook__(exc_type, exc_value, exc_traceback)
        return
    exc_info=(exc_type, exc_value, exc_traceback)
    logging.critical("\nDate:" + str(datetime.datetime.now()), exc_info=(exc_type, exc_value, exc_traceback))
    print("An error occured, check error.log to see the error details")
    traceback.print_exception(*exc_info)


sys.excepthook = handle_exception

Undefined or null for AngularJS

I asked the same question of the lodash maintainers a while back and they replied by mentioning the != operator can be used here:

if(newVal != null) {
  // newVal is defined
}

This uses JavaScript's type coercion to check the value for undefined or null.

If you are using JSHint to lint your code, add the following comment blocks to tell it that you know what you are doing - most of the time != is considered bad.

/* jshint -W116 */ 
if(newVal != null) {
/* jshint +W116 */
  // newVal is defined
}

Could not find main class HelloWorld

Just remove your "classpath" from you environment variable. Then try running:

java HelloWorld

This should work fine.

How do I convert datetime to ISO 8601 in PHP

After PHP 5 you can use this: echo date("c"); form ISO 8601 formatted datetime.

http://ideone.com/nD7piL

Note for comments:

Regarding to this, both of these expressions are valid for timezone, for basic format: ±[hh]:[mm], ±[hh][mm], or ±[hh].

But note that, +0X:00 is correct, and +0X00 is incorrect for extended usage. So it's better to use date("c"). A similar discussion here.

Java int to String - Integer.toString(i) vs new Integer(i).toString()

I also highly recommend using

int integer = 42;
String string = integer + "";

Simple and effective.

How can I tell what edition of SQL Server runs on the machine?

You can get just the edition (plus under individual properties) using SERVERPROPERTY

e.g.

SELECT SERVERPROPERTY('Edition')

Quote (for "Edition"):

Installed product edition of the instance of SQL Server. Use the value of this property to determine the features and the limits, such as maximum number of CPUs, that are supported by the installed product.
Returns:
'Desktop Engine' (Not available for SQL Server 2005.)
'Developer Edition'
'Enterprise Edition'
'Enterprise Evaluation Edition'
'Personal Edition'(Not available for SQL Server 2005.)
'Standard Edition'
'Express Edition'
'Express Edition with Advanced Services'
'Workgroup Edition'
'Windows Embedded SQL'
Base data type: nvarchar(128)

How to set css style to asp.net button?

If you have a button in asp.net design page like "Default.asp" and you want to create CSS file and specified attributes for a button,labels or other controller. Then first of all create a css page

Right click on Project
Add new item
Select StyleSheet

now you have a css page now write these code in your css page(StyleSheet.css)

StyleSheet.css

.mybtnstyle
{
 border:1px solid Red;
 background-color:Red;
 border-style:groove;
 border-top:5px;
 outline-style:dotted;
}

Default.asp

{

  <head> 
  <title> testing.com </title>
 </head>
<body>
 <b>Using Razer<b/>
<form id="form1" runat="server">
 <link id="Link1" rel="stylesheet" runat="server" media="screen" href="Stylesheet1.css" />
 <asp:Button ID="mybtn" class="mybtn" runat="server" Width="339px"/>
 </form>
 </body>
</html>

}

Vertical divider CSS

<div class="headerdivider"></div>

and

.headerdivider {
    border-left: 1px solid #38546d;
    background: #16222c;
    width: 1px;
    height: 80px;
    position: absolute;
    right: 250px;
    top: 10px;
}

How do I check if an object has a specific property in JavaScript?

OK, it looks like I had the right answer unless if you don't want inherited properties:

if (x.hasOwnProperty('key'))

Here are some other options to include inherited properties:

if (x.key) // Quick and dirty, but it does the same thing as below.

if (x.key !== undefined)

RS256 vs HS256: What's the difference?

In cryptography there are two types of algorithms used:

Symmetric algorithms

A single key is used to encrypt data. When encrypted with the key, the data can be decrypted using the same key. If, for example, Mary encrypts a message using the key "my-secret" and sends it to John, he will be able to decrypt the message correctly with the same key "my-secret".

Asymmetric algorithms

Two keys are used to encrypt and decrypt messages. While one key(public) is used to encrypt the message, the other key(private) can only be used to decrypt it. So, John can generate both public and private keys, then send only the public key to Mary to encrypt her message. The message can only be decrypted using the private key.

HS256 and RS256 Scenario

These algorithms are NOT used to encrypt/decryt data. Rather they are used to verify the origin or the authenticity of the data. When Mary needs to send an open message to Jhon and he needs to verify that the message is surely from Mary, HS256 or RS256 can be used.

HS256 can create a signature for a given sample of data using a single key. When the message is transmitted along with the signature, the receiving party can use the same key to verify that the signature matches the message.

RS256 uses pair of keys to do the same. A signature can only be generated using the private key. And the public key has to be used to verify the signature. In this scenario, even if Jack finds the public key, he cannot create a spoof message with a signature to impersonate Mary.

getContext is not a function

Alternatively you can use:

this.element=$(id)[0];

With android studio no jvm found, JAVA_HOME has been set

Here is the tutorial :- http://javatechig.com/android/installing-android-studio and http://codearetoy.wordpress.com/2010/12/23/jdk-not-found-on-installing-android-sdk/

Adding a system variable JDK_HOME with value c:\Program Files\Java\jdk1.7.0_21\ worked for me. The latest Java release can be downloaded here. Additionally, make sure the variable JAVA_HOME is also set with the above location.

Please note that the above location is my java location. Please post your location in the path

Access-Control-Allow-Origin: * in tomcat

I was setting up cors.support.credentials to true along with cors.allowed.origins as *, which won't work.

When cors.allowed.origins is * , then cors.support.credentials should be false (default value or shouldn't be set explicitly).

https://tomcat.apache.org/tomcat-7.0-doc/config/filter.html

java.lang.NoClassDefFoundError: com/sun/mail/util/MailLogger for JUnit test case for Java mail

The javax.mail-api artifact is only good for compiling against.

You actually need to run code, so you need a complete implementation of JavaMail API. Use this:

<dependency>
    <groupId>com.sun.mail</groupId>
    <artifactId>javax.mail</artifactId>
    <version>1.6.2</version>
</dependency>

NOTE: The version number will probably differ. Check the latest version here.

Replacing characters in Ant property

Two possibilities :

via script task and builtin javascript engine (if using jdk >= 1.6)

<project>

 <property name="propA" value="This is a value"/>

 <script language="javascript">
  project.setProperty('propB', project.getProperty('propA').
   replace(" ", "_"));
 </script>
 <echo>$${propB} => ${propB}</echo>

</project>

or using Ant addon Flaka

<project xmlns:fl="antlib:it.haefelinger.flaka">

 <property name="propA" value="This is a value"/>

 <fl:let> propB := replace('${propA}', '_', ' ')</fl:let>

 <echo>$${propB} => ${propB}</echo>

</project>

to overwrite exisiting property propA simply replace propB with propA

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

Components are declared, Modules are imported, and Services are provided. An example I'm working with:

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';


import { AppComponent } from './app.component';
import {FormsModule} from '@angular/forms';
import { UserComponent } from './components/user/user.component';
import { StateService } from './services/state.service';    

@NgModule({
  declarations: [
    AppComponent,
    UserComponent
  ],
  imports: [
    BrowserModule,
    FormsModule
  ],
  providers: [ StateService ],
  bootstrap: [ AppComponent ]
})
export class AppModule { }

Spring not autowiring in unit tests with JUnit

I had same problem with Spring Boot 2.1.1 and JUnit 4
just added those annotations:

@RunWith( SpringRunner.class )
@SpringBootTest

and all went well.

For Junit 5:

@ExtendWith(SpringExtension.class)

source

How to POST JSON request using Apache HttpClient?

Apache HttpClient doesn't know anything about JSON, so you'll need to construct your JSON separately. To do so, I recommend checking out the simple JSON-java library from json.org. (If "JSON-java" doesn't suit you, json.org has a big list of libraries available in different languages.)

Once you've generated your JSON, you can use something like the code below to POST it

StringRequestEntity requestEntity = new StringRequestEntity(
    JSON_STRING,
    "application/json",
    "UTF-8");

PostMethod postMethod = new PostMethod("http://example.com/action");
postMethod.setRequestEntity(requestEntity);

int statusCode = httpClient.executeMethod(postMethod);

Edit

Note - The above answer, as asked for in the question, applies to Apache HttpClient 3.1. However, to help anyone looking for an implementation against the latest Apache client:

StringEntity requestEntity = new StringEntity(
    JSON_STRING,
    ContentType.APPLICATION_JSON);

HttpPost postMethod = new HttpPost("http://example.com/action");
postMethod.setEntity(requestEntity);

HttpResponse rawResponse = httpclient.execute(postMethod);

Delete empty rows

DELETE FROM table WHERE edit_user IS NULL;

Why do I get a warning icon when I add a reference to an MEF plugin project?

I also faced the same problem but my case was a bit different the ones above. I tried to open a project created in a different computer. I found that the path to package folder is not updated when you add a reference so restarting VS, changing .NET version, or any mentioned recommendation does not solve the problem. I opened the csproj file in notepad++ and corrected all the relative paths to packages folder. Then; all the warnings are gone. Hope it helps.

How to set initial value and auto increment in MySQL?

Also , in PHPMyAdmin , you can select table from left side(list of tables) then do this by going there.
Operations Tab->Table Options->AUTO_INCREMENT.

Now, Set your values and then press Go under the Table Options Box.

How to send a GET request from PHP?

Remember that if you are using a proxy you need to do a little trick in your php code:

(PROXY WITHOUT AUTENTICATION EXAMPLE)

<?php
$aContext = array(
    'http' => array(
        'proxy' => 'proxy:8080',
        'request_fulluri' => true,
    ),
);
$cxContext = stream_context_create($aContext);

$sFile = file_get_contents("http://www.google.com", False, $cxContext);

echo $sFile;
?>

Is it possible to import modules from all files in a directory, using a wildcard?

Just an other approach to @Bergi's answer

// lib/things/index.js
import ThingA from './ThingA';
import ThingB from './ThingB';
import ThingC from './ThingC';

export default {
 ThingA,
 ThingB,
 ThingC
}

Uses

import {ThingA, ThingB, ThingC} from './lib/things';

What's the C++ version of Java's ArrayList

A couple of additional points re use of vector here.

Unlike ArrayList and Array in Java, you don't need to do anything special to treat a vector as an array - the underlying storage in C++ is guaranteed to be contiguous and efficiently indexable.

Unlike ArrayList, a vector can efficiently hold primitive types without encapsulation as a full-fledged object.

When removing items from a vector, be aware that the items above the removed item have to be moved down to preserve contiguous storage. This can get expensive for large containers.

Make sure if you store complex objects in the vector that their copy constructor and assignment operators are efficient. Under the covers, C++ STL uses these during container housekeeping.

Advice about reserve()ing storage upfront (ie. at vector construction or initialilzation time) to minimize memory reallocation on later extension carries over from Java to C++.

How to update a single library with Composer?

Just use

composer require {package/packagename}

composer require phpmailer/phpmailer

if the package is not in the vendor folder.. composer installs it and if the package exists, composer update package to the latest version.

go to character in vim

:goto 21490 will take you to the 21490th byte in the buffer.

How to change 1 char in the string?

While it does not answer the OP's question precisely, depending on what you're doing it might be a good solution. Below is going to solve my problem.

Let's say that you have to do a lot of individual manipulation of various characters in a string. Instead of using a string the whole time use a char[] array while you're doing the manipulation. Because you can do this:

 char[] array = "valta is the best place in the World".ToCharArray();

Then manipulate to your hearts content as much as you need...

 array[0] = "M";

Then convert it to a string once you're done and need to use it as a string:

string str = new string(array);

Change <br> height using CSS

_x000D_

#biglinebreakid {_x000D_
  line-height: 450%;_x000D_
  // 9x the normal height of a line break!_x000D_
}_x000D_
.biglinebreakclass {_x000D_
  line-height: 1em;_x000D_
  // you could even use calc!_x000D_
}

_x000D_

This is a small line_x000D_
<br />_x000D_
break. Whereas, this is a BIG line_x000D_
<br />_x000D_
<br id="biglinebreakid" />_x000D_
break! You can use any CSS selectors you want for things like this line_x000D_
<br />_x000D_
<br class="biglinebreakclass" />_x000D_
break!

_x000D_

How to split a string to 2 strings in C

This is how you implement a strtok() like function (taken from a BSD licensed string processing library for C, called zString).

Below function differs from the standard strtok() in the way it recognizes consecutive delimiters, whereas the standard strtok() does not.

char *zstring_strtok(char *str, const char *delim) {
    static char *static_str=0;      /* var to store last address */
    int index=0, strlength=0;       /* integers for indexes */
    int found = 0;                  /* check if delim is found */

    /* delimiter cannot be NULL
    * if no more char left, return NULL as well
    */
    if (delim==0 || (str == 0 && static_str == 0))
        return 0;

    if (str == 0)
        str = static_str;

    /* get length of string */
    while(str[strlength])
        strlength++;

    /* find the first occurance of delim */
    for (index=0;index<strlength;index++)
        if (str[index]==delim[0]) {
            found=1;
            break;
        }

    /* if delim is not contained in str, return str */
    if (!found) {
        static_str = 0;
        return str;
    }

    /* check for consecutive delimiters
    *if first char is delim, return delim
    */
    if (str[0]==delim[0]) {
        static_str = (str + 1);
        return (char *)delim;
    }

    /* terminate the string
    * this assignmetn requires char[], so str has to
    * be char[] rather than *char
    */
    str[index] = '\0';

    /* save the rest of the string */
    if ((str + index + 1)!=0)
        static_str = (str + index + 1);
    else
        static_str = 0;

        return str;
}

Below is an example code that demonstrates the usage

  Example Usage
      char str[] = "A,B,,,C";
      printf("1 %s\n",zstring_strtok(s,","));
      printf("2 %s\n",zstring_strtok(NULL,","));
      printf("3 %s\n",zstring_strtok(NULL,","));
      printf("4 %s\n",zstring_strtok(NULL,","));
      printf("5 %s\n",zstring_strtok(NULL,","));
      printf("6 %s\n",zstring_strtok(NULL,","));

  Example Output
      1 A
      2 B
      3 ,
      4 ,
      5 C
      6 (null)

You can even use a while loop (standard library's strtok() would give the same result here)

char s[]="some text here;
do {
    printf("%s\n",zstring_strtok(s," "));
} while(zstring_strtok(NULL," "));

Crystal Reports - Adding a parameter to a 'Command' query

When you are in the Command, click Create to create a new parameter; call it project_name. Once you've created it, double click its name to add it to the command's text. You query should resemble:

SELECT Projecttname, ReleaseDate, TaskName
FROM DB_Table
WHERE Project_Name LIKE {?project_name} + '*'
AND ReleaseDate >= getdate() --assumes sql server

If desired, link the main report to the subreport on this ({?project_name}) field. If you don't establish a link between the main and subreport, CR will prompt you for the subreport's parameter.

In versions prior to 2008, a command's parameter was only allowed to be a scalar value.

How to cast List<Object> to List<MyClass>

Note that I am no java programmer, but in .NET and C#, this feature is called contravariance or covariance. I haven't delved into those things yet, since they are new in .NET 4.0, which I'm not using since it's only beta, so I don't know which of the two terms describe your problem, but let me describe the technical issue with this.

Let's assume you were allowed to cast. Note, I say cast, since that's what you said, but there are two operations that could be possible, casting and converting.

Converting would mean that you get a new list object, but you say casting, which means you want to temporarily treat one object as another type.

Here's the problem with that.

What would happen if the following was allowed (note, I'm assuming that before the cast, the list of objects actually only contain Customer objects, otherwise the cast wouldn't work even in this hypothetical version of java):

List<Object> list = getList();
List<Customer> customers = (List<Customer>)list;
list.Insert(0, new someOtherObjectNotACustomer());
Customer c = customers[0];

In this case, this would attempt to treat an object, that isn't a customer, as a customer, and you would get a runtime error at one point, either form inside the list, or from the assignment.

Generics, however, is supposed to give you type-safe data types, like collections, and since they like to throw the word 'guaranteed' around, this sort of cast, with the problems that follow, is not allowed.

In .NET 4.0 (I know, your question was about java), this will be allowed in some very specific cases, where the compiler can guarantee that the operations you do are safe, but in the general sense, this type of cast will not be allowed. The same holds for java, although I'm unsure about any plans to introduce co- and contravariance to the java language.

Hopefully, someone with better java knowledge than me can tell you the specifics for the java future or implementation.

What does 'killed' mean when a processing of a huge CSV with Python, which suddenly stops?

I doubt anything is killing the process just because it takes a long time. Killed generically means something from the outside terminated the process, but probably not in this case hitting Ctrl-C since that would cause Python to exit on a KeyboardInterrupt exception. Also, in Python you would get MemoryError exception if that was the problem. What might be happening is you're hitting a bug in Python or standard library code that causes a crash of the process.

What is the difference between new/delete and malloc/free?

This code for use of delete keyword or free function. But when create a pointer object using 'malloc' or 'new' and deallocate object memory using delete even that object pointer can be call function in the class. After that use free instead of delete then also it works after free statement , but when use both then only pointer object can't call to function in class.. the code is as follows :

#include<iostream>


using namespace std;

class ABC{
public: ABC(){
    cout<<"Hello"<<endl;
  }

  void disp(){
    cout<<"Hi\n";
  }

};

int main(){

ABC* b=(ABC*)malloc(sizeof(ABC));
int* q = new int[20];
ABC *a=new ABC();
b->disp();

cout<<b<<endl;
free(b);
delete b;
//a=NULL;
b->disp();
ABC();
cout<<b;
return 0;
}

output :

Hello
Hi
0x2abfef37cc20

foreach for JSON array , syntax

Try this:

$.each(result,function(index, value){
    console.log('My array has at position ' + index + ', this value: ' + value);
});

mysql after insert trigger which updates another table's column

DELIMITER //

CREATE TRIGGER contacts_after_insert
AFTER INSERT
   ON contacts FOR EACH ROW

BEGIN

   DECLARE vUser varchar(50);

   -- Find username of person performing the INSERT into table
   SELECT USER() INTO vUser;

   -- Insert record into audit table
   INSERT INTO contacts_audit
   ( contact_id,
     deleted_date,
     deleted_by)
   VALUES
   ( NEW.contact_id,
     SYSDATE(),
     vUser );

END; //

DELIMITER ;

How do I convert number to string and pass it as argument to Execute Process Task?

Expression: "Total Count: " + (DT_WSTR, 11)@[User::int32Value]

for Int32 -- (-2,147,483,648 to 2,147,483,647)

Equivalent of Oracle's RowID in SQL Server

Please try

select NEWID()

Source: https://docs.microsoft.com/en-us/sql/t-sql/data-types/uniqueidentifier-transact-sql

Twitter Bootstrap modal: How to remove Slide down effect

.modal.fade, .modal.fade .modal-dialog {
    -webkit-transition: none;
    -moz-transition: none;
    -ms-transition: none;
    -o-transition: none;
    transition: none;
}

Register DLL file on Windows Server 2008 R2

I have found similar issue while registering my activeX (OCX) into windows server 2008 R2.To solve this i used http://www.chestysoft.com/dllregsvr/default.asp tool.There is some dependance problem with my ocx so I am getting "The module temp12.dll failed to load. Make sure the binary is stored at the specified path or debut it to check for problems with the binary or dependent .DLL files. The specified module could not be found" error message. When you try to registered your OCX with this tool it will prompt message if the ocx is having dependency or you will get success message.I got message for mfc70.dll and msvcr70.dll dependency.so i paste these dll into system32 folder of C:\windows and its done.After that I register my ocx sucessfully.I used 32 bit version of chestysoft tool (dllregsvr.exe) on windows server 2008 R2 64bit machine.

How to set custom header in Volley Request

In Kotlin,

You have to override getHeaders() method like :

val volleyEnrollRequest = object : JsonObjectRequest(GET_POST_PARAM, TARGET_URL, PAYLOAD_BODY_IF_YOU_WISH,
            Response.Listener {
                // Success Part  
            },

            Response.ErrorListener {
                // Failure Part
            }
        ) {
            // Providing Request Headers

            override fun getHeaders(): Map<String, String> {
               // Create HashMap of your Headers as the example provided below

                val headers = HashMap<String, String>()
                headers["Content-Type"] = "application/json"
                headers["app_id"] = APP_ID
                headers["app_key"] = API_KEY

                return headers
            }
        }

Random string generation with upper case letters and digits

None of the answers so far guarantee presence of certain categories of characters like upper, lower, digits etc; so other answers may result in passwords that do not have digits, etc. Surprised that such a function is not part of standard lib. Here is what I use:

def random_password(*, nchars = 7, min_nupper = 3, ndigits = 3, nspecial = 3, special=string.punctuation):
    letters = random.choices(string.ascii_lowercase, k=nchars)
    letters_upper = random.choices(string.ascii_uppercase, k=min_nupper)
    digits = random.choices(string.digits, k=ndigits)
    specials = random.choices(special, k=nspecial)

    password_chars = letters + letters_upper + digits + specials
    random.shuffle(password_chars)

    return ''.join(password_chars)

sendmail: how to configure sendmail on ubuntu?

Combine two answers above, I finally make it work. Just be careful that the first single quote for each string is a backtick (`) in file sendmail.mc.

#Change to your mail config directory:
cd /etc/mail

#Make a auth subdirectory
mkdir auth
chmod 700 auth  #maybe not, because I cannot apply cmd "cd auth" if I do so.

#Create a file with your auth information to the smtp server
cd auth
touch client-info

#In the file, put the following, matching up to your smtp server:
AuthInfo:your.isp.net "U:root" "I:user" "P:password"

#Generate the Authentication database, make both files readable only by root
makemap hash client-info < client-info
chmod 600 client-info
cd ..

#Add the following lines to sendmail.mc. Make sure you update your smtp server
#The first single quote for each string should be changed to a backtick (`) like this:
define(`SMART_HOST',`your.isp.net')dnl
define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
FEATURE(`authinfo',`hash /etc/mail/auth/client-info')dnl

#run 
sudo sendmailconfig

Getting a list of associative array keys

Try this:

var keys = [];
for (var key in dictionary) {
  if (dictionary.hasOwnProperty(key)) {
    keys.push(key);
  }
}

hasOwnProperty is needed because it's possible to insert keys into the prototype object of dictionary. But you typically don't want those keys included in your list.

For example, if you do this:

Object.prototype.c = 3;
var dictionary = {a: 1, b: 2};

and then do a for...in loop over dictionary, you'll get a and b, but you'll also get c.

How to switch from the default ConstraintLayout to RelativeLayout in Android Studio

inefficient solution:

Create a new Layout

Go to /res/layout folder in Android Studio
Right click -> New -> Layout Resource files
give it a name and add .xml at the end
Erase the Root Element field and type 'RelativeLayout'

ORA-12170: TNS:Connect timeout occurred

It is because of conflicting SID. For example, in your Oracle12cBase\app\product\12.1.0\dbhome_1\NETWORK\ADMIN\tnsnames.ora file, connection description for ORCL is this:

ORCL =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl)
    )
  )

And, you are trying to connect using the connection string using same SID but different IP, username/password, like this:

sqlplus username/[email protected]:1521/orcl

To resolve this, make changes in the tnsnames.ora file:

ORCL =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.130.52)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl)
    )
  )

Delete the first five characters on any line of a text file in Linux with sed

Use cut:

cut -c6-

This prints each line of the input starting at column 6 (the first column is 1).

Single Page Application: advantages and disadvantages

Let's look at one of the most popular SPA sites, GMail.

1. SPA is extremely good for very responsive sites:

Server-side rendering is not as hard as it used to be with simple techniques like keeping a #hash in the URL, or more recently HTML5 pushState. With this approach the exact state of the web app is embedded in the page URL. As in GMail every time you open a mail a special hash tag is added to the URL. If copied and pasted to other browser window can open the exact same mail (provided they can authenticate). This approach maps directly to a more traditional query string, the difference is merely in the execution. With HTML5 pushState() you can eliminate the #hash and use completely classic URLs which can resolve on the server on the first request and then load via ajax on subsequent requests.

2. With SPA we don't need to use extra queries to the server to download pages.

The number of pages user downloads during visit to my web site?? really how many mails some reads when he/she opens his/her mail account. I read >50 at one go. now the structure of the mails is almost the same. if you will use a server side rendering scheme the server would then render it on every request(typical case). - security concern - you should/ should not keep separate pages for the admins/login that entirely depends upon the structure of you site take paytm.com for example also making a web site SPA does not mean that you open all the endpoints for all the users I mean I use forms auth with my spa web site. - in the probably most used SPA framework Angular JS the dev can load the entire html temple from the web site so that can be done depending on the users authentication level. pre loading html for all the auth types isn't SPA.

3. May be any other advantages? Don't hear about any else..

these days you can safely assume the client will have javascript enabled browsers.
only one entry point of the site. As I mentioned earlier maintenance of state is possible you can have any number of entry points as you want but you should have one for sure.
even in an SPA user only see to what he has proper rights. you don't have to inject every thing at once. loading diff html templates and javascript async is also a valid part of SPA.

Advantages that I can think of are:

rendering html obviously takes some resources now every user visiting you site is doing this. also not only rendering major logics are now done client side instead of server side.
date time issues - I just give the client UTC time is a pre set format and don't even care about the time zones I let javascript handle it. this is great advantage to where I had to guess time zones based on location derived from users IP.
to me state is more nicely maintained in an SPA because once you have set a variable you know it will be there. this gives a feel of developing an app rather than a web page. this helps a lot typically in making sites like foodpanda, flipkart, amazon. because if you are not using client side state you are using expensive sessions.
websites surely are extremely responsive - I'll take an extreme example for this try making a calculator in a non SPA website(I know its weird).

Updates from Comments

It doesn't seem like anyone mentioned about sockets and long-polling. If you log out from another client say mobile app, then your browser should also log out. If you don't use SPA, you have to re-create the socket connection every time there is a redirect. This should also work with any updates in data like notifications, profile update etc

An alternate perspective: Aside from your website, will your project involve a native mobile app? If yes, you are most likely going to be feeding raw data to that native app from a server (ie JSON) and doing client-side processing to render it, correct? So with this assertion, you're ALREADY doing a client-side rendering model. Now the question becomes, why shouldn't you use the same model for the website-version of your project? Kind of a no-brainer. Then the question becomes whether you want to render server-side pages only for SEO benefits and convenience of shareable/bookmarkable URLs

Visual Studio can't build due to rc.exe

This might be a little outdated. But if copying the rc.exe and exdll.dll did not work, there is a chance that the windows sdk is not installed properly even if the windows sdk folder exists. You can update the sdk for win 8 in the following page: http://msdn.microsoft.com/en-US/windows/hardware/hh852363 After re-installing the sdk, the problem would get solved. Also make sure that platform toolset is set properly.

SELECT * FROM X WHERE id IN (...) with Dapper ORM

If your IN clause is too big for MSSQL to handle, you can use a TableValueParameter with Dapper pretty easily.

Create your TVP type in MSSQL:

CREATE TYPE [dbo].[MyTVP] AS TABLE([ProviderId] [int] NOT NULL)

Create a DataTable with the same column(s) as the TVP and populate it with values

var tvpTable = new DataTable();
tvpTable.Columns.Add(new DataColumn("ProviderId", typeof(int)));
// fill the data table however you wish

Modify your Dapper query to do an INNER JOIN on the TVP table:

var query = @"SELECT * FROM Providers P
    INNER JOIN @tvp t ON p.ProviderId = t.ProviderId";

Pass the DataTable in your Dapper query call

sqlConn.Query(query, new {tvp = tvpTable.AsTableValuedParameter("dbo.MyTVP")});

This also works fantastically when you want to do a mass update of multiple columns - simply build a TVP and do an UPDATE with an inner join to the TVP.

How can I get a list of locally installed Python modules?

From the shell

ls site-packages

If that's not helpful, you can do this.

import sys
import os
for p in sys.path:
    print os.listdir( p )

And see what that produces.

error: request for member '..' in '..' which is of non-class type

Certainly a corner case for this error, but I received it in a different situation, when attempting to overload the assignment operator=. It was a bit cryptic IMO (from g++ 8.1.1).

#include <cstdint>

enum DataType
{
  DT_INT32,
  DT_FLOAT
};

struct PrimitiveData
{
  union MyData
  {
    int32_t i;
    float f;
  } data;

  enum DataType dt;

  template<typename T>
  void operator=(T data)
  {
    switch(dt)
    {
      case DT_INT32:
      {
        data.i = data;
        break;
      }
      case DT_FLOAT:
      {
        data.f = data;
        break;
      }
      default:
      {
        break;
      }
    }
  }
};

int main()
{
  struct PrimitiveData pd;
  pd.dt = DT_FLOAT;
  pd = 3.4f;

  return 0;
}

I received 2 "identical" errors

error: request for member ‘i’ [and 'f'] in ‘data’, which is of non-class type ‘float’

(The equivalent error for clang is: error: member reference base type 'float' is not a structure or union)

for the lines data.i = data; and data.f = data;. Turns out the compiler was confusing local variable name 'data' and my member variable data. When I changed this to void operator=(T newData) and data.i = newData;, data.f = newData;, the error went away.

How to use color picker (eye dropper)?

To open the Eye Dropper simply:

Open DevTools F12
Go to Elements tab
Under Styles side bar click on any color preview box

Its main functionality is to inspect pixel color values by clicking them though with its new features you can also see your page's existing colors palette or material design palette by clicking on the two arrows icon at the bottom. It can get quite handy when designing your page.

How to convert String to Date value in SAS?

Try

data _null_; 
   monyy = '05May2013'; 
   date = input(substr(strip(monyy),1,9),date9.);
   put date=date9.; 
   run;

Convert date to UTC using moment.js

moment.utc(date).format(...);

is the way to go, since

moment().utc(date).format(...);

does behave weird...

XSLT - How to select XML Attribute by Attribute?

Note: using // at the beginning of the xpath is a bit CPU intensitve -- it will search every node for a match. Using a more specific path, such as /root/DataSet will create a faster query.

How often does python flush to a file?

Here is another approach, up to the OP to choose which one he prefers.

When including the code below in the __init__.py file before any other code, messages printed with print and any errors will no longer be logged to Ableton's Log.txt but to separate files on your disk:

import sys

path = "/Users/#username#"

errorLog = open(path + "/stderr.txt", "w", 1)
errorLog.write("---Starting Error Log---\n")
sys.stderr = errorLog
stdoutLog = open(path + "/stdout.txt", "w", 1)
stdoutLog.write("---Starting Standard Out Log---\n")
sys.stdout = stdoutLog

(for Mac, change #username# to the name of your user folder. On Windows the path to your user folder will have a different format)

When you open the files in a text editor that refreshes its content when the file on disk is changed (example for Mac: TextEdit does not but TextWrangler does), you will see the logs being updated in real-time.

Credits: this code was copied mostly from the liveAPI control surface scripts by Nathan Ramella

Laravel 5.4 create model, controller and migration in single artisan command

php artisan make:model PurchaseRequest -crm

The Result is

Model created successfully.
Created Migration: 2018_11_11_011541_create_purchase_requests_table
Controller created successfully.

Just use -crm instead of -mcr

svn cleanup: sqlite: database disk image is malformed

Do not waste your time on checking integrity or deleting data from work queue table because these are temporary solutions and it will hit you back after a while.

Just do another checkout and replace the existing .svn folder with the new one. Do an update and then it should go smooth.

remove space between paragraph and unordered list

I got pretty good results with my HTML mailing list by using the following:

p { margin-bottom: 0; }
ul { margin-top: 0; }

This does not reset all margin values but only those that create such a gap before ordered list, and still doesn't assume anything about default margin values.

virtualbox Raw-mode is unavailable courtesy of Hyper-V windows 10

In my case, was the Docker that cause problems:

Val and Var in Kotlin

var is a variable like any other language. eg.

var price: Double

On the other side, val provides you feature of referencing. eg.

val CONTINENTS = 7
// You refer this to get constant value 7. In this case, val acts as access
// specifier final in Java

and,

val Int.absolute: Int
    get() {
        return Math.abs(this)
    }
// You refer to the newly create 'method' which provides absolute value 
// of your integer

println(-5.absolute) // O.P: 5

Print current call stack from a method in Python code

Here's an example of getting the stack via the traceback module, and printing it:

import traceback

def f():
    g()

def g():
    for line in traceback.format_stack():
        print(line.strip())

f()

# Prints:
# File "so-stack.py", line 10, in <module>
#     f()
# File "so-stack.py", line 4, in f
#     g()
# File "so-stack.py", line 7, in g
#     for line in traceback.format_stack():

If you really only want to print the stack to stderr, you can use:

traceback.print_stack()

Or to print to stdout (useful if want to keep redirected output together), use:

traceback.print_stack(file=sys.stdout)

But getting it via traceback.format_stack() lets you do whatever you like with it.

What is console.log?

console.log specifically is a method for developers to write code to inconspicuously inform the developers what the code is doing. It can be used to alert you that there's an issue, but shouldn't take the place of an interactive debugger when it comes time to debug the code. Its asynchronous nature means that the logged values don't necessarily represent the value when the method was called.

In short: log errors with console.log (if available), then fix the errors using your debugger of choice: Firebug, WebKit Developer Tools (built-in to Safari and Chrome), IE Developer Tools or Visual Studio.

How to use AND in IF Statement

If there are no typos in the question, you got the conditions wrong:

You said this:

IF cells (i,"A") contains the text 'Miami'

...but your code says:

If Cells(i, "A") <> "Miami"

--> <> means that the value of the cell is not equal to "Miami", so you're not checking what you think you are checking.

I guess you want this instead:

If Cells(i, "A") like "*Miami*"

EDIT:

Sorry, but I can't really help you more. As I already said in a comment, I'm no Excel VBA expert.
Normally I would open Excel now and try your code myself, but I don't even have Excel on any of my machines at home (I use OpenOffice).

Just one general thing: can you identify the row that does not work?
Maybe this helps someone else to answer the question.

Does it ever execute (or at least try to execute) the Cells(i, "C").Value = "BA" line?
Or is the If Cells(i, "A") like "*Miami*" stuff already False?
If yes, try checking just one cell and see if that works.

How to add "active" class to wp_nav_menu() current menu item (simple way)

Just paste this code into functions.php file:

add_filter('nav_menu_css_class' , 'special_nav_class' , 10 , 2);

function special_nav_class ($classes, $item) {
  if (in_array('current-menu-item', $classes) ){
    $classes[] = 'active ';
  }
  return $classes;
}

.NET console application as Windows service

I usually use the following techinque to run the same app as a console application or as a service:

public static class Program
{
    #region Nested classes to support running as service
    public const string ServiceName = "MyService";

    public class Service : ServiceBase
    {
        public Service()
        {
            ServiceName = Program.ServiceName;
        }

        protected override void OnStart(string[] args)
        {
            Program.Start(args);
        }

        protected override void OnStop()
        {
            Program.Stop();
        }
    }
    #endregion

    static void Main(string[] args)
    {
        if (!Environment.UserInteractive)
            // running as service
            using (var service = new Service())
                ServiceBase.Run(service);
        else
        {
            // running as console app
            Start(args);

            Console.WriteLine("Press any key to stop...");
            Console.ReadKey(true);

            Stop();
        }
    }

    private static void Start(string[] args)
    {
        // onstart code here
    }

    private static void Stop()
    {
        // onstop code here
    }
}

Environment.UserInteractive is normally true for console app and false for a service. Techically, it is possible to run a service in user-interactive mode, so you could check a command-line switch instead.

How to check db2 version

SELECT GETVARIABLE('SYSIBM.VERSION') FROM SYSIBM.SYSDUMMY1

Angularjs action on click of button

The calculation occurs immediately since the calculation call is bound in the template, which displays its result when quantity changes.

Instead you could try the following approach. Change your markup to the following:

<div ng-controller="myAppController" style="text-align:center">
  <p style="font-size:28px;">Enter Quantity:
      <input type="text" ng-model="quantity"/>
  </p>
  <button ng-click="calculateQuantity()">Calculate</button>
  <h2>Total Cost: Rs.{{quantityResult}}</h2>
</div>

Next, update your controller:

myAppModule.controller('myAppController', function($scope,calculateService) {
  $scope.quantity=1;
  $scope.quantityResult = 0;

  $scope.calculateQuantity = function() {
    $scope.quantityResult = calculateService.calculate($scope.quantity, 10);
  };
});

Here's a JSBin example that demonstrates the above approach.

The problem with this approach is the calculated result remains visible with the old value till the button is clicked. To address this, you could hide the result whenever the quantity changes.

This would involve updating the template to add an ng-change on the input, and an ng-if on the result:

<input type="text" ng-change="hideQuantityResult()" ng-model="quantity"/>

and

<h2 ng-if="showQuantityResult">Total Cost: Rs.{{quantityResult}}</h2>

In the controller add:

$scope.showQuantityResult = false;

$scope.calculateQuantity = function() {
  $scope.quantityResult = calculateService.calculate($scope.quantity, 10);
  $scope.showQuantityResult = true;
};

$scope.hideQuantityResult = function() {
  $scope.showQuantityResult = false;
};

These updates can be seen in this JSBin demo.

Calling functions in a DLL from C++

Presuming you're talking about dynamic runtime loading of DLLs, you're looking for LoadLibrary and GetProAddress. There's an example on MSDN.

Is it possible to access to google translate api for free?

Yes, you can use GT for free. See the post with explanation. And look at repo on GitHub.

UPD 19.03.2019 Here is a version for browser on GitHub.

Convert string into integer in bash script - "Leading Zero" number error

The leading 0 is leading to bash trying to interpret your number as an octal number, but octal numbers are 0-7, and 8 is thus an invalid token.

If I were you, I would add some logic to remove a leading 0, add one, and re-add the leading 0 if the result is < 10.

Detect whether Office is 32bit or 64bit via the registry

I have win 7 64 bit + Excel 2010 32 bit. The registry is HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\14.0\Registration{90140000-002A-0000-1000-0000000FF1CE}

So this can tell bitness of OS, not bitness of Office

Is it possible to get the index you're sorting over in Underscore.js?

Index is actually available like;

_.sortBy([1, 4, 2, 66, 444, 9], function(num, index){  });

How do I print bytes as hexadecimal?

Well you can convert one byte (unsigned char) at a time into a array like so

char buffer [17];
buffer[16] = 0;
for(j = 0; j < 8; j++)
    sprintf(&buffer[2*j], "%02X", data[j]);

How do I get a file extension in PHP?

Sorry... "Short Question; But NOT Short Answer"

Example 1 for PATH

$path = "/home/ali/public_html/wp-content/themes/chicken/css/base.min.css";
$name = pathinfo($path, PATHINFO_FILENAME);
$ext  = pathinfo($path, PATHINFO_EXTENSION);
printf('<hr> Name: %s <br> Extension: %s', $name, $ext);

Example 2 for URL

$url = "//www.example.com/dir/file.bak.php?Something+is+wrong=hello";
$url = parse_url($url);
$name = pathinfo($url['path'], PATHINFO_FILENAME);
$ext  = pathinfo($url['path'], PATHINFO_EXTENSION);
printf('<hr> Name: %s <br> Extension: %s', $name, $ext);

Output of example 1:

Name: base.min
Extension: css

Output of example 2:

Name: file.bak
Extension: php

References

How to read a single character from the user?

My solution for python3, not depending on any pip packages.

# precondition: import tty, sys
def query_yes_no(question, default=True):
    """
    Ask the user a yes/no question.
    Returns immediately upon reading one-char answer.
    Accepts multiple language characters for yes/no.
    """
    if not sys.stdin.isatty():
        return default
    if default:
        prompt = "[Y/n]?"
        other_answers = "n"
    else:
        prompt = "[y/N]?"
        other_answers = "yjosiá"

    print(question,prompt,flush= True,end=" ")
    oldttysettings = tty.tcgetattr(sys.stdin.fileno())
    try:
        tty.setraw(sys.stdin.fileno())
        return not sys.stdin.read(1).lower() in other_answers
    except:
        return default
    finally:
        tty.tcsetattr(sys.stdin.fileno(), tty.TCSADRAIN , oldttysettings)
        sys.stdout.write("\r\n")
        tty.tcdrain(sys.stdin.fileno())

in linux terminal, how do I show the folder's last modification date, taking its content into consideration?

It seems to me that simply: ls -lt mydirectory does the job...

How to remove trailing whitespaces with sed?

Thanks to codaddict for suggesting the -i option.

The following command solves the problem on Snow Leopard

sed -i '' -e's/[ \t]*$//' "$1"

application/x-www-form-urlencoded or multipart/form-data?

READ AT LEAST THE FIRST PARA HERE!

I know this is 3 years too late, but Matt's (accepted) answer is incomplete and will eventually get you into trouble. The key here is that, if you choose to use multipart/form-data, the boundary must not appear in the file data that the server eventually receives.

This is not a problem for application/x-www-form-urlencoded, because there is no boundary. x-www-form-urlencoded can also always handle binary data, by the simple expedient of turning one arbitrary byte into three 7BIT bytes. Inefficient, but it works (and note that the comment about not being able to send filenames as well as binary data is incorrect; you just send it as another key/value pair).

The problem with multipart/form-data is that the boundary separator must not be present in the file data (see RFC 2388; section 5.2 also includes a rather lame excuse for not having a proper aggregate MIME type that avoids this problem).

So, at first sight, multipart/form-data is of no value whatsoever in any file upload, binary or otherwise. If you don't choose your boundary correctly, then you will eventually have a problem, whether you're sending plain text or raw binary - the server will find a boundary in the wrong place, and your file will be truncated, or the POST will fail.

The key is to choose an encoding and a boundary such that your selected boundary characters cannot appear in the encoded output. One simple solution is to use base64 (do not use raw binary). In base64 3 arbitrary bytes are encoded into four 7-bit characters, where the output character set is [A-Za-z0-9+/=] (i.e. alphanumerics, '+', '/' or '='). = is a special case, and may only appear at the end of the encoded output, as a single = or a double ==. Now, choose your boundary as a 7-bit ASCII string which cannot appear in base64 output. Many choices you see on the net fail this test - the MDN forms docs, for example, use "blob" as a boundary when sending binary data - not good. However, something like "!blob!" will never appear in base64 output.

"import datetime" v.s. "from datetime import datetime"

try this:

import datetime
from datetime import datetime as dt

today_date = datetime.date.today()
date_time = dt.strptime(date_time_string, '%Y-%m-%d %H:%M')

strp() doesn't exist. I think you mean strptime.

Creating a procedure in mySql with parameters

I figured it out now. Here's the correct answer

CREATE PROCEDURE checkUser 
(
   brugernavn1 varchar(64),
   password varchar(64)
) 
BEGIN 
   SELECT COUNT(*) FROM bruger 
   WHERE bruger.brugernavn=brugernavn1 
   AND bruger.pass=password; 
END;

@ points to a global var in mysql. The above syntax is correct.

Insert an item into sorted list in Python

This is a possible solution for you:

a = [15, 12, 10]
b = sorted(a)
print b # --> b = [10, 12, 15]
c = 13
for i in range(len(b)):
    if b[i] > c:
        break
d = b[:i] + [c] + b[i:]
print d # --> d = [10, 12, 13, 15]

Entity Framework: There is already an open DataReader associated with this Command

In my case I found that there were missing "await" statements before myContext.SaveChangesAsync() calls. Adding await before those async calls fixed the data reader issues for me.

CSS opacity only to background color, not the text on it?

For anyone coming across this thread, here's a script called thatsNotYoChild.js that I just wrote that solves this problem automatically:

http://www.impressivewebs.com/fixing-parent-child-opacity/

Basically, it separates children from the parent element, but keeps the element in the same physical location on the page.

How do you underline a text in Android XML?

First of all, go to String.xml file

you can add any HTML attributes like , italic or bold or underline here.

    <resources>
        <string name="your_string_here">This is an <u>underline</u>.</string>
    </resources>

What's the difference between Cache-Control: max-age=0 and no-cache?

By the way, it's worth noting that some mobile devices, particularly Apple products like iPhone/iPad completely ignore headers like no-cache, no-store, Expires: 0, or whatever else you may try to force them to not re-use expired form pages.

This has caused us no end of headaches as we try to get the issue of a user's iPad say, being left asleep on a page they have reached through a form process, say step 2 of 3, and then the device totally ignores the store/cache directives, and as far as I can tell, simply takes what is a virtual snapshot of the page from its last state, that is, ignoring what it was told explicitly, and, not only that, taking a page that should not be stored, and storing it without actually checking it again, which leads to all kinds of strange Session issues, among other things.

I'm just adding this in case someone comes along and can't figure out why they are getting session errors with particularly iphones and ipads, which seem by far to be the worst offenders in this area.

I've done fairly extensive debugger testing with this issue, and this is my conclusion, the devices ignore these directives completely.

Even in regular use, I've found that some mobiles also totally fail to check for new versions via say, Expires: 0 then checking last modified dates to determine if it should get a new one.

It simply doesn't happen, so what I was forced to do was add query strings to the css/js files I needed to force updates on, which tricks the stupid mobile devices into thinking it's a file it does not have, like: my.css?v=1, then v=2 for a css/js update. This largely works.

User browsers also, by the way, if left to their defaults, as of 2016, as I continuously discover (we do a LOT of changes and updates to our site) also fail to check for last modified dates on such files, but the query string method fixes that issue. This is something I've noticed with clients and office people who tend to use basic normal user defaults on their browsers, and have no awareness of caching issues with css/js etc, almost invariably fail to get the new css/js on change, which means the defaults for their browsers, mostly MSIE / Firefox, are not doing what they are told to do, they ignore changes and ignore last modified dates and do not validate, even with Expires: 0 set explicitly.

This was a good thread with a lot of good technical information, but it's also important to note how bad the support for this stuff is in particularly mobile devices. Every few months I have to add more layers of protection against their failure to follow the header commands they receive, or to properly interpet those commands.

Why doesn't Dijkstra's algorithm work for negative weight edges?

The other answers so far demonstrate pretty well why Dijkstra's algorithm cannot handle negative weights on paths.

But the question itself is maybe based on a wrong understanding of the weight of paths. If negative weights on paths would be allowed in pathfinding algorithms in general, then you would get permanent loops that would not stop.

Consider this:

A  <- 5 ->  B  <- (-1) ->  C <- 5 -> D

What is the optimal path between A and D?

Any pathfinding algorithm would have to continuously loop between B and C because doing so would reduce the weight of the total path. So allowing negative weights for a connection would render any pathfindig algorithm moot, maybe except if you limit each connection to be used only once.

So, to explain this in more detail, consider the following paths and weights:

Path               | Total weight
ABCD               | 9
ABCBCD             | 7
ABCBCBCD           | 5
ABCBCBCBCD         | 3
ABCBCBCBCBCD       | 1
ABCBCBCBCBCBCD     | -1
...

So, what's the perfect path? Any time the algorithm adds a BC step, it reduces the total weight by 2.

So the optimal path is A (BC) D with the BC part being looped forever.

Since Dijkstra's goal is to find the optimal path (not just any path), it, by definition, cannot work with negative weights, since it cannot find the optimal path.

Dijkstra will actually not loop, since it keeps a list of nodes that it has visited. But it will not find a perfect path, but instead just any path.

Neatest way to remove linebreaks in Perl

Reading perlport I'd suggest something like

$line =~ s/\015?\012?$//;

to be safe for whatever platform you're on and whatever linefeed style you may be processing because what's in \r and \n may differ through different Perl flavours.

Execute a large SQL script (with GO commands)

This is what I knocked together to solve my immediate problem.

private void ExecuteBatchNonQuery(string sql, SqlConnection conn) {
    string sqlBatch = string.Empty;
    SqlCommand cmd = new SqlCommand(string.Empty, conn);
    conn.Open();
    sql += "\nGO";   // make sure last batch is executed.
    try {
        foreach (string line in sql.Split(new string[2] { "\n", "\r" }, StringSplitOptions.RemoveEmptyEntries)) {
            if (line.ToUpperInvariant().Trim() == "GO") {
                cmd.CommandText = sqlBatch;
                cmd.ExecuteNonQuery();
                sqlBatch = string.Empty;
            } else {
                sqlBatch += line + "\n";
            }
        }            
    } finally {
        conn.Close();
    }
}

It requires GO commands to be on their own line, and will not detect block-comments, so this sort of thing will get split, and cause an error:

ExecuteBatchNonQuery(@"
    /*
    GO
    */", conn);

ExecuteNonQuery doesn't return results

The ExecuteNonQuery method is used for SQL statements that are not queries, such as INSERT, UPDATE, ... You want to use ExecuteScalar or ExecuteReader if you expect your statement to return results (i.e. a query).

How to check if input file is empty in jQuery

  $("#customFile").change(function() { 
    var fileName = $("#customFile").val();  

    if(fileName) { // returns true if the string is not empty   
        $('.picture-selected').addClass('disable-inputs'); 
        $('#btn').removeClass('disabled');   
    } else { // no file was selected 
      $('.picture-selected').removeClass('disable-inputs'); 
      $('#btn').addClass('disabled');
    }  
  });

How to hide collapsible Bootstrap 4 navbar on click

With trying out above solutions, I was missing a solution for Dropdown toggles, so here you go! Also opens submenu items.

Maybe you have to tweak it a bit if your toggle class is different.

$('.navbar-nav li a').on('click', function(){
    if(!$( this ).hasClass('dropdown-toggle')){
        $('.navbar-collapse').collapse('hide');
    }
});

How to get the top position of an element?

Try: $('#mytable').attr('offsetTop')

Setting a spinner onClickListener() in Android

The following works how you want it, but it is not ideal.

public class Tester extends Activity {

    String[] vals = { "here", "are", "some", "values" };
    Spinner spinner;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        spinner = (Spinner) findViewById(R.id.spin);
        ArrayAdapter<String> ad = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, vals);
        spinner.setAdapter(ad);
        Log.i("", "" + spinner.getChildCount());
        Timer t = new Timer();
        t.schedule(new TimerTask() {

            @Override
            public void run() {
                int a = spinner.getCount();
                int b = spinner.getChildCount();
                System.out.println("Count =" + a);
                System.out.println("ChildCount =" + b);
                for (int i = 0; i < b; i++) {
                    View v = spinner.getChildAt(i);
                    if (v == null) {
                        System.out.println("View not found");
                    } else {
                        v.setOnClickListener(new View.OnClickListener() {

                            @Override
                            public void onClick(View v) {
                                        Log.i("","click");
                                        }
                        });
                    }
                }
            }
        }, 500);
    }
}

Let me know exactly how you need the spinner to behave, and we can work out a better solution.

How to use tick / checkmark symbol (?) instead of bullets in unordered list?

You can use a pseudo-element to insert that character before each list item:

_x000D_

ul {_x000D_
  list-style: none;_x000D_
}_x000D_
_x000D_
ul li:before {_x000D_
  content: '?';_x000D_
}

_x000D_

<ul>_x000D_
  <li>this is my text</li>_x000D_
  <li>this is my text</li>_x000D_
  <li>this is my text</li>_x000D_
  <li>this is my text</li>_x000D_
  <li>this is my text</li>_x000D_
</ul>

_x000D_

How do I launch a Git Bash window with particular working directory using a script?

I might given a wrong direction, but, I like this trick.

Using Windows Explorer, pointing to any directory you want, type "cmd" in the address bar it will open Windows command prompt in that directory.

If you have the "Git" directory in your path, in the same way, you can type "git-bash" in the address bar and a Git Shell will open in that directory.

How to select only the records with the highest date in LINQ

Go a simple way to do this :-

Created one class to hold following information

Level (number)
Url (Url of the site)

Go the list of sites stored on a ArrayList object. And executed following query to sort it in descending order by Level.

var query = from MyClass object in objCollection 
    orderby object.Level descending 
    select object

Once I got the collection sorted in descending order, I wrote following code to get the Object that comes as top row

MyClass topObject = query.FirstRow<MyClass>()

This worked like charm.

How to get screen width and height

Within an activity, you can call:

int width = this.getResources().getDisplayMetrics().widthPixels;
int height = this.getResources().getDisplayMetrics().heightPixels;

When you're in a View, then you need to get the Context first:

int width = getContext().getResources().getDisplayMetrics().widthPixels;
int height = getContext().getResources().getDisplayMetrics().heightPixels;

This will work in all Android version, available since API 1, and never deprecated.

How to convert a string of bytes into an int?

You can also use the struct module to do this:

>>> struct.unpack("<L", "y\xcc\xa6\xbb")[0]
3148270713L

How to add buttons dynamically to my form?

You can't add a Button to an empty list without creating a new instance of that Button. You are missing the

Button newButton = new Button();

in your code plus get rid of the .Capacity

enable or disable checkbox in html

In jsp you can do it like this:

<%
boolean checkboxDisabled = true; //do your logic here
String checkboxState = checkboxDisabled ? "disabled" : "";
%>
<input type="checkbox" <%=checkboxState%>>

Eclipse : Maven search dependencies doesn't work

The maven add dependency is actually from the maven indexes. If the indexes is up to date, the result should be from there.

If you go to the maven repository, then select global repository, you should see a central ... tab, and select that, there should be a list of folders, and you should be able to see all the indexes from there. If not, then it means you didn't get the full index, then you can right click that and enable full index.

Another thing I annoyed me most is even I did everything, it still not showing anything when I type "spring". This is actually where I did wrong. If you just type some additional text "springframework", BOOM, the result is there.

Angular JS update input field after change

I'm guessing that when you enter a value into the totals field that value expression somehow gets overwritten.

However, you can take an alternative approach: Create a field for the total value and when either one or two changes update that field.

<li>Total <input type="text" ng-model="total">{{total}}</li>

And change the javascript:

function TodoCtrl($scope) {
    $scope.$watch('one * two', function (value) {
        $scope.total = value;
    });
}

Example fiddle here.

How to update single value inside specific array item in redux

In my case I did something like this, based on Luis's answer:

...State object...
userInfo = {
name: '...',
...
}

...Reducer's code...
case CHANGED_INFO:
return {
  ...state,
  userInfo: {
    ...state.userInfo,
    // I'm sending the arguments like this: changeInfo({ id: e.target.id, value: e.target.value }) and use them as below in reducer!
    [action.data.id]: action.data.value,
  },
};

Execute a SQL Stored Procedure and process the results

Dim sqlConnection1 As New SqlConnection("Your Connection String")
Dim cmd As New SqlCommand

cmd.CommandText = "StoredProcedureName"
cmd.CommandType = CommandType.StoredProcedure
cmd.Connection = sqlConnection1

sqlConnection1.Open()

Dim adapter As System.Data.SqlClient.SqlDataAdapter
Dim dsdetailwk As New DataSet

Try
   adapter = New System.Data.SqlClient.SqlDataAdapter
   adapter.SelectCommand = cmd
   adapter.Fill(dsdetailwk, "delivery")
   Catch Err As System.Exception
End Try

sqlConnection1.Close()

datagridview1.DataSource = dsdetailwk.Tables(0)

Failed to auto-configure a DataSource: 'spring.datasource.url' is not specified

In gradle build i simply:

compile('org.springframework.boot:spring-boot-starter-data-jpa') compile('org.springframework.boot:spring-boot-starter-security') compile('org.springframework.boot:spring-boot-starter-web') compile('org.springframework.boot:spring-boot-devtools')

removed

**`compile('org.springframework.boot:spring-boot-starter-data-jpa')`**

and it worked for me.

How does the JPA @SequenceGenerator annotation work

sequenceName is the name of the sequence in the DB. This is how you specify a sequence that already exists in the DB. If you go this route, you have to specify the allocationSize which needs to be the same value that the DB sequence uses as its "auto increment".

Usage:

@GeneratedValue(generator="my_seq")
@SequenceGenerator(name="my_seq",sequenceName="MY_SEQ", allocationSize=1)

If you want, you can let it create a sequence for you. But to do this, you must use SchemaGeneration to have it created. To do this, use:

@GeneratedValue(strategy=GenerationType.SEQUENCE)

Also, you can use the auto-generation, which will use a table to generate the IDs. You must also use SchemaGeneration at some point when using this feature, so the generator table can be created. To do this, use:

@GeneratedValue(strategy=GenerationType.AUTO)

TypeError: document.getElementbyId is not a function

Case sensitive: document.getElementById (notice the capital B).

Maven: mvn command not found

If you are on windows, what i suppose you need to do set the PATH like this:

SET PATH=%M2%

furthermore i assume you need to set your path to something like C:...\apache-maven-3.0.3\ cause this is the default folder for the windows archive. On the other i assume you need to add the path of maven to your and not set it to only maven so you setting should look like this:

SET PATH=%PATH%;%M2%

Save image from url with curl PHP

Option #1

Instead of picking the binary/raw data into a variable and then writing, you can use CURLOPT_FILE option to directly show a file to the curl for the downloading.

Here is the function:

// takes URL of image and Path for the image as parameter
function download_image1($image_url, $image_file){
    $fp = fopen ($image_file, 'w+');              // open file handle

    $ch = curl_init($image_url);
    // curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); // enable if you want
    curl_setopt($ch, CURLOPT_FILE, $fp);          // output to file
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ch, CURLOPT_TIMEOUT, 1000);      // some large value to allow curl to run for a long time
    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0');
    // curl_setopt($ch, CURLOPT_VERBOSE, true);   // Enable this line to see debug prints
    curl_exec($ch);

    curl_close($ch);                              // closing curl handle
    fclose($fp);                                  // closing file handle
}

And here is how you should call it:

// test the download function
download_image1("http://www.gravatar.com/avatar/10773ae6687b55736e171c038b4228d2", "local_image1.jpg");

Option #2

Now, If you want to download a very large file, that case above function may not become handy. You can use the below function this time for handling a big file. Also, you can print progress(in % or in any other format) if you want. Below function is implemented using a callback function that writes a chunk of data in to the file in to the progress of downloading.

// takes URL of image and Path for the image as parameter
function download_image2($image_url){
    $ch = curl_init($image_url);
    // curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); // enable if you want
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ch, CURLOPT_TIMEOUT, 1000);      // some large value to allow curl to run for a long time
    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0');
    curl_setopt($ch, CURLOPT_WRITEFUNCTION, "curl_callback");
    // curl_setopt($ch, CURLOPT_VERBOSE, true);   // Enable this line to see debug prints
    curl_exec($ch);

    curl_close($ch);                              // closing curl handle
}

/** callback function for curl */
function curl_callback($ch, $bytes){
    global $fp;
    $len = fwrite($fp, $bytes);
    // if you want, you can use any progress printing here
    return $len;
}

And here is how to call this function:

// test the download function
$image_file = "local_image2.jpg";
$fp = fopen ($image_file, 'w+');              // open file handle
download_image2("http://www.gravatar.com/avatar/10773ae6687b55736e171c038b4228d2");
fclose($fp);                                  // closing file handle

How to fix apt-get: command not found on AWS EC2?

Try replacing apt-get with yum as Amazon Linux based AMI uses the yum command instead of apt-get.

git-diff to ignore ^M

Developing on Windows, I ran into this problem when using git tfs. I solved it this way:

git config --global core.whitespace cr-at-eol

This basically tells Git that an end-of-line CR is not an error. As a result, those annoying ^M characters no longer appear at the end of lines in git diff, git show, etc.

It appears to leave other settings as-is; for instance, extra spaces at the end of a line still show as errors (highlighted in red) in the diff.

(Other answers have alluded to this, but the above is exactly how to set the setting. To set the setting for only one project, omit the --global.)

EDIT:

After many line-ending travails, I've had the best luck, when working on a .NET team, with these settings:

NO core.eol setting
NO core.whitespace setting
NO core.autocrlf setting
When running the Git installer for Windows, you'll get these three options:
- Checkout Windows-style, commit Unix-style line endings <-- choose this one
- Checkout as-is, commit Unix-style line endings
- Checkout as-is, commit as-is

If you need to use the whitespace setting, you should probably enable it only on a per-project basis if you need to interact with TFS. Just omit the --global:

git config core.whitespace cr-at-eol

If you need to remove some core.* settings, the easiest way is to run this command:

git config --global -e

This opens your global .gitconfig file in a text editor, and you can easily delete the lines you want to remove. (Or you can put '#' in front of them to comment them out.)

Oracle 11g Express Edition for Windows 64bit?

There is

I used this blog post to install it in my machine: http://luminite.wordpress.com/2012/09/06/installing-oracle-database-xe-11g-on-windows-7-64-bit-machine/

The only thing you have to do is replace a registry value during the installation, I've done it about three times already, and every time found a different reference on-line, none here on stackoverflow.

EDIT: as @kc2001 noted, regedit must be run as Administrator, and added this tutorial: (a bit more colorful): http://www.hanmiaojuan.com/2013/03/install-oracle-xe-11g-for-windows7-64bits.html

A failure occurred while executing com.android.build.gradle.internal.tasks

found the solution.

add this code to your build.gradle,

dependencies {
    def multidex_version = "2.0.1"
    implementation 'androidx.multidex:multidex:$multidex_version'
}

then enable the multidex to true

 defaultConfig {
        ...
        minSdkVersion 15 
        targetSdkVersion 28
        multiDexEnabled true
    }

How to split one string into multiple variables in bash shell?

If your solution doesn't have to be general, i.e. only needs to work for strings like your example, you could do:

var1=$(echo $STR | cut -f1 -d-)
var2=$(echo $STR | cut -f2 -d-)

I chose cut here because you could simply extend the code for a few more variables...

Symfony2 and date_default_timezone_get() - It is not safe to rely on the system's timezone settings

Since PHP 5.5, there is a separate php.ini file for CLI interface. If You use symfony console from command line, then this specific php.ini is used.

In Ubuntu 13.10 check file:

/etc/php5/cli/php.ini

How to fix nginx throws 400 bad request headers on any header testing tools?

When nginx returns 400(bad request) it will log the reason into error log, at "info" level and take a look into error log when testing.

How to write asynchronous functions for Node.js

You seem to be confusing asynchronous IO with asynchronous functions. node.js uses asynchronous non-blocking IO because non blocking IO is better. The best way to understand it is to go watch some videos by ryan dahl.

How do I write asynchronous functions for Node?

Just write normal functions, the only difference is that they are not executed immediately but passed around as callbacks.

How should I implement error event handling correctly

Generally API's give you a callback with an err as the first argument. For example

database.query('something', function(err, result) {
  if (err) handle(err);
  doSomething(result);
});

Is a common pattern.

Another common pattern is on('error'). For example

process.on('uncaughtException', function (err) {
  console.log('Caught exception: ' + err);
});

Edit:

var async_function = function(val, callback){
    process.nextTick(function(){
        callback(val);
    });
};

The above function when called as

async_function(42, function(val) {
  console.log(val)
});
console.log(43);

Will print 42 to the console asynchronously. In particular process.nextTick fires after the current eventloop callstack is empty. That call stack is empty after async_function and console.log(43) have run. So we print 43 followed by 42.

You should probably do some reading on the event loop.

Creating a 3D sphere in Opengl using Visual C++

Here's the code:

glPushMatrix();
glTranslatef(18,2,0);
glRotatef(angle, 0, 0, 0.7);
glColor3ub(0,255,255);
glutWireSphere(3,10,10);
glPopMatrix();

How to get JSON data from the URL (REST API) to UI using jQuery or plain JavaScript?

 jquery.ajax({
            url: `//your api url`
            type: "GET",
            dataType: "json",
            success: function(data) {
                jQuery.each(data, function(index, value) {
                        console.log(data);
                        `All you API data is here`
                    }
                }
            });

LIKE vs CONTAINS on SQL Server

I think that CONTAINS took longer and used Merge because you had a dash("-") in your query adventure-works.com.

The dash is a break word so the CONTAINS searched the full-text index for adventure and than it searched for works.com and merged the results.

How to change a css class style through Javascript?

document.getElementById("my").className = 'myclass';

Warning: mysqli_real_escape_string() expects exactly 2 parameters, 1 given... what I do wrong?

use mysql_real_escape_string() instead of mysqli_real_escape_string()

like so:

$username = mysql_real_escape_string($_POST['username']);

How to scroll to top of page with JavaScript/jQuery?

Combination of these two helped me. None of the other answers helped me since i had a sidenav that was not scrolling.

 setTimeout(function () {
        window.scroll({
                        top: 0,
                        left: 0,
                        behavior: 'smooth'
                    });

    document.body.scrollTop = document.documentElement.scrollTop = 0;

}, 15);

Can I add extension methods to an existing static class?

No. Extension methods require an instance variable (value) for an object. You can however, write a static wrapper around the ConfigurationManager interface. If you implement the wrapper, you don't need an extension method since you can just add the method directly.

 public static class ConfigurationManagerWrapper
 {
      public static ConfigurationSection GetSection( string name )
      {
         return ConfigurationManager.GetSection( name );
      }

      .....

      public static ConfigurationSection GetWidgetSection()
      {
          return GetSection( "widgets" );
      }
 }

Byte[] to InputStream or OutputStream

I do realize that my answer is way late for this question but I think the community would like a newer approach to this issue.

onSaveInstanceState () and onRestoreInstanceState ()

onRestoreInstanceState() is called only when recreating activity after it was killed by the OS. Such situation happen when:

orientation of the device changes (your activity is destroyed and recreated).
there is another activity in front of yours and at some point the OS kills your activity in order to free memory (for example). Next time when you start your activity onRestoreInstanceState() will be called.

In contrast: if you are in your activity and you hit Back button on the device, your activity is finish()ed (i.e. think of it as exiting desktop application) and next time you start your app it is started "fresh", i.e. without saved state because you intentionally exited it when you hit Back.

Other source of confusion is that when an app loses focus to another app onSaveInstanceState() is called but when you navigate back to your app onRestoreInstanceState() may not be called. This is the case described in the original question, i.e. if your activity was NOT killed during the period when other activity was in front onRestoreInstanceState() will NOT be called because your activity is pretty much "alive".

All in all, as stated in the documentation for onRestoreInstanceState():

Most implementations will simply use onCreate(Bundle) to restore their state, but it is sometimes convenient to do it here after all of the initialization has been done or to allow subclasses to decide whether to use your default implementation. The default implementation of this method performs a restore of any view state that had previously been frozen by onSaveInstanceState(Bundle).

As I read it: There is no reason to override onRestoreInstanceState() unless you are subclassing Activity and it is expected that someone will subclass your subclass.

Receiver not registered exception error?

I used a try - catch block to solve the issue temporarily.

// Unregister Observer - Stop monitoring the underlying data source.
        if (mDataSetChangeObserver != null) {
            // Sometimes the Fragment onDestroy() unregisters the observer before calling below code
            // See <a>http://stackoverflow.com/questions/6165070/receiver-not-registered-exception-error</a>
            try  {
                getContext().unregisterReceiver(mDataSetChangeObserver);
                mDataSetChangeObserver = null;
            }
            catch (IllegalArgumentException e) {
                // Check wether we are in debug mode
                if (BuildConfig.IS_DEBUG_MODE) {
                    e.printStackTrace();
                }
            }
        }

Select tableview row programmatically

UITableView's selectRowAtIndexPath:animated:scrollPosition: should do the trick.

Just pass UITableViewScrollPositionNone for scrollPosition and the user won't see any movement.

You should also be able to manually run the action:

[theTableView.delegate tableView:theTableView didSelectRowAtIndexPath:indexPath]

after you selectRowAtIndexPath:animated:scrollPosition: so the highlight happens as well as any associated logic.

jquery ajax get responsetext from http url

Since jQuery AJAX requests fail if they are cross-domain, you can use cURL (in PHP) to set up a proxy server.

Suppose a PHP file responder.php has these contents:

$url = "https://www.google.com";
$ch      = curl_init( $url );
curl_set_opt($ch, CURLOPT_RETURNTRANSFER, "true")
$response= curl_exec( $ch );
curl_close( $ch );
return $response;

Your AJAX request should be to this responder.php file so that it executes the cross-domain request.

How to sum data.frame column values?

To sum values in data.frame you first need to extract them as a vector.

There are several way to do it:

# $ operatior
x <- people$Weight
x
# [1] 65 70 64

Or using [, ] similar to matrix:

x <- people[, 'Weight']
x
# [1] 65 70 64

Once you have the vector you can use any vector-to-scalar function to aggregate the result:

sum(people[, 'Weight'])
# [1] 199

If you have NA values in your data, you should specify na.rm parameter:

sum(people[, 'Weight'], na.rm = TRUE)

Save the plots into a PDF

For multiple plots in a single pdf file you can use PdfPages

In the plotGraph function you should return the figure and than call savefig of the figure object.

------ plotting module ------

def plotGraph(X,Y):
      fig = plt.figure()
      ### Plotting arrangements ###
      return fig

------ plotting module ------

----- mainModule ----

from matplotlib.backends.backend_pdf import PdfPages

plot1 = plotGraph(tempDLstats, tempDLlabels)
plot2 = plotGraph(tempDLstats_1, tempDLlabels_1)
plot3 = plotGraph(tempDLstats_2, tempDLlabels_2)

pp = PdfPages('foo.pdf')
pp.savefig(plot1)
pp.savefig(plot2)
pp.savefig(plot3)
pp.close()

<> And Not In VB.NET

in fact the Is is really good, since to the developpers, you may want to override the operator ==, to compare with the value. say you have a class A, operator == of A is to compare some of the field of A to the parameter. then you will be in trouble in c# to verify whether the object of A is null with following code,

    A a = new A();
...
    if (a != null)
it will totally wrong, you always need to use if((object)a != null)
but in vb.net you cannot write in this way, you always need to write
    if not a is nothing then
or
    if a isnot nothing then

which just as Christian said, vb.net does not 'expected' anything.

PHP "php://input" vs $_POST

php://input can give you the raw bytes of the data. This is useful if the POSTed data is a JSON encoded structure, which is often the case for an AJAX POST request.

Here's a function to do just that:

  /**
   * Returns the JSON encoded POST data, if any, as an object.
   * 
   * @return Object|null
   */
  private function retrieveJsonPostData()
  {
    // get the raw POST data
    $rawData = file_get_contents("php://input");

    // this returns null if not valid json
    return json_decode($rawData);
  }

The $_POST array is more useful when you're handling key-value data from a form, submitted by a traditional POST. This only works if the POSTed data is in a recognised format, usually application/x-www-form-urlencoded (see http://www.w3.org/TR/html4/interact/forms.html#h-17.13.4 for details).

What are the Android SDK build-tools, platform-tools and tools? And which version should be used?

I'll leave the discussion of the difference between Build Tools, Platform Tools, and Tools to others. From a practical standpoint, you only need to know the answer to your second question:

Which version should be used?

Answer: Use the most recent version.

For those using Android Studio with Gradle, the buildToolsVersion has to be set in the build.gradle (Module: app) file.

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.2"

    ...
}

Where do I get the most recent version number of Build Tools?

Open the Android SDK Manager.

In Android Studio go to Tools > Android > SDK Manager > Appearance & Behavior > System Settings > Android SDK
Choose the SDK Tools tab.
Select Android SDK Build Tools from the list
Check Show Package Details.

The last item will show the most recent version.

Make sure it is installed and then write that number as the buildToolsVersion in build.gradle (Module: app).

301 or 302 Redirection With PHP

Add regression line equation and R^2 on graph

Inspired by the equation style provided in this answer, a more generic approach (more than one predictor + latex output as option) can be:

print_equation= function(model, latex= FALSE, ...){
    dots <- list(...)
    cc= model$coefficients
    var_sign= as.character(sign(cc[-1]))%>%gsub("1","",.)%>%gsub("-"," - ",.)
    var_sign[var_sign==""]= ' + '

    f_args_abs= f_args= dots
    f_args$x= cc
    f_args_abs$x= abs(cc)
    cc_= do.call(format, args= f_args)
    cc_abs= do.call(format, args= f_args_abs)
    pred_vars=
        cc_abs%>%
        paste(., x_vars, sep= star)%>%
        paste(var_sign,.)%>%paste(., collapse= "")

    if(latex){
        star= " \\cdot "
        y_var= strsplit(as.character(model$call$formula), "~")[[2]]%>%
            paste0("\\hat{",.,"_{i}}")
        x_vars= names(cc_)[-1]%>%paste0(.,"_{i}")
    }else{
        star= " * "
        y_var= strsplit(as.character(model$call$formula), "~")[[2]]        
        x_vars= names(cc_)[-1]
    }

    equ= paste(y_var,"=",cc_[1],pred_vars)
    if(latex){
        equ= paste0(equ," + \\hat{\\varepsilon_{i}} \\quad where \\quad \\varepsilon \\sim \\mathcal{N}(0,",
                    summary(MetamodelKdifEryth)$sigma,")")%>%paste0("$",.,"$")
    }
    cat(equ)
}

The model argument expects an lm object, the latex argument is a boolean to ask for a simple character or a latex-formated equation, and the ... argument pass its values to the format function.

I also added an option to output it as latex so you can use this function in a rmarkdown like this:


```{r echo=FALSE, results='asis'}
print_equation(model = lm_mod, latex = TRUE)
```

Now using it:

df <- data.frame(x = c(1:100))
df$y <- 2 + 3 * df$x + rnorm(100, sd = 40)
df$z <- 8 + 3 * df$x + rnorm(100, sd = 40)
lm_mod= lm(y~x+z, data = df)

print_equation(model = lm_mod, latex = FALSE)

This code yields: y = 11.3382963933174 + 2.5893419 * x + 0.1002227 * z

And if we ask for a latex equation, rounding the parameters to 3 digits:

print_equation(model = lm_mod, latex = TRUE, digits= 3)

This yields:

How to change the default background color white to something else in twitter bootstrap

You can overwrite Bootstraps default CSS by adding your own rules.

<style type="text/css">
   body { background: navy !important; } /* Adding !important forces the browser to overwrite the default style applied by Bootstrap */
</style>

getResourceAsStream() vs FileInputStream

FileInputStream will load a the file path you pass to the constructor as relative from the working directory of the Java process. Usually in a web container, this is something like the bin folder.

getResourceAsStream() will load a file path relative from your application's classpath.

Is there a short cut for going back to the beginning of a file by vi editor?

I've always used Ctrl + Home (start of file) and Ctrl + End (end of file).

Works in both insert and nav modes.

How to add a title to a html select tag

Typically, I would suggest that you use the <optgroup> option, as that gives some nice styling and indenting to the element.

The HTML element creates a grouping of options within a element. (Source: MDN Web Docs: <optgroup>.

But, since an <optgroup> cannot be a selected value, you can make an <option selected disabled> and then stylize it with CSS so that it behaves like an <optgroup>....

_x000D_

.optionGroup {
    font-weight: bold;
    font-style: italic;
}

_x000D_

<select>
    <option class="optionGroup" selected disabled>Choose one</option>
    <option value="sydney" class="optionChild">&nbsp;&nbsp;&nbsp;&nbsp;Sydney</option>
    <option value="melbourne" class="optionChild">&nbsp;&nbsp;&nbsp;&nbsp;Melbourne</option>
    <option value="cromwell" class="optionChild">&nbsp;&nbsp;&nbsp;&nbsp;Cromwell</option>
    <option value="queenstown" class="optionChild">&nbsp;&nbsp;&nbsp;&nbsp;Queenstown</option>
</select>

_x000D_

MongoDB: Server has startup warnings ''Access control is not enabled for the database''

You need to delete your old db folder and recreate new one. It will resolve your issue.

How to convert Nvarchar column to INT

Your CAST() looks correct.

Your CONVERT() is not correct. You are quoting the column as a string. You will want something like

CONVERT(INT, A.my_NvarcharColumn)

** notice without the quotes **

The only other reason why this could fail is if you have a non-numeric character in the field value or if it's out of range.

You can try something like the following to verify it's numeric and return a NULL if it's not:

SELECT
 CASE
  WHEN ISNUMERIC(A.my_NvarcharColumn) = 1 THEN CONVERT(INT, A.my_NvarcharColumn)
  ELSE NULL
 END AS my_NvarcharColumn

Convert a char to upper case using regular expressions (EditPad Pro)

I know this thread is about EditPad Pro, but I came here because I had the same need with a javascript regexp.

For the people who are here needing the same tip, you can use a function or lambda as the replace argument.

I use the function below to convert css names with - to the javascript equivalent, for example, "border-top" will be transformed into "borderTop":

    s = s.replace(/\-[a-z]/g, x => x[1].toUpperCase());

Checkout subdirectories in Git?

As your edit points out, you can use two separate branches to store the two separate directories. This does keep them both in the same repository, but you still can't have commits spanning both directory trees. If you have a change in one that requires a change in the other, you'll have to do those as two separate commits, and you open up the possibility that a pair of checkouts of the two directories can go out of sync.

If you want to treat the pair of directories as one unit, you can use 'wordpress/wp-content' as the root of your repo and use .gitignore file at the top level to ignore everything but the two subdirectories of interest. This is probably the most reasonable solution at this point.

Sparse checkouts have been allegedly coming for two years now, but there's still no sign of them in the git development repo, nor any indication that the necessary changes will ever arrive there. I wouldn't count on them.

Which rows are returned when using LIMIT with OFFSET in MySQL?

It will return 18 results starting on record #9 and finishing on record #26.

Start by reading the query from offset. First you offset by 8, which means you skip the first 8 results of the query. Then you limit by 18. Which means you consider records 9, 10, 11, 12, 13, 14, 15, 16....24, 25, 26 which are a total of 18 records.

Check this out.

And also the official documentation.

Make cross-domain ajax JSONP request with jQuery

You need to use the ajax-cross-origin plugin: http://www.ajax-cross-origin.com/

Just add the option crossOrigin: true

$.ajax({
    crossOrigin: true,
    url: url,
    success: function(data) {
        console.log(data);
    }
});

PostgreSQL Error: Relation already exists

You cannot create a table with a name that is identical to an existing table or view in the cluster. To modify an existing table, use ALTER TABLE (link), or to drop all data currently in the table and create an empty table with the desired schema, issue DROP TABLE before CREATE TABLE.

It could be that the sequence you are creating is the culprit. In PostgreSQL, sequences are implemented as a table with a particular set of columns. If you already have the sequence defined, you should probably skip creating it. Unfortunately, there's no equivalent in CREATE SEQUENCE to the IF NOT EXISTS construct available in CREATE TABLE. By the looks of it, you might be creating your schema unconditionally, anyways, so it's reasonable to use

DROP TABLE IF EXISTS csd_relationship;
DROP SEQUENCE IF EXISTS csd_relationship_csd_relationship_id_seq;

before the rest of your schema update; In case it isn't obvious, This will delete all of the data in the csd_relationship table, if there is any

Access-control-allow-origin with multiple domains

You can add this code to your asp.net webapi project

in file Global.asax

    protected void Application_BeginRequest()
{
    string origin = Request.Headers.Get("Origin");
    if (Request.HttpMethod == "OPTIONS")
    {
        Response.AddHeader("Access-Control-Allow-Origin", origin);
        Response.AddHeader("Access-Control-Allow-Headers", "*");
        Response.AddHeader("Access-Control-Allow-Methods", "GET,POST,PUT,OPTIONS,DELETE");
        Response.StatusCode = 200;
        Response.End();
    }
    else
    {
        Response.AddHeader("Access-Control-Allow-Origin", origin);
        Response.AddHeader("Access-Control-Allow-Headers", "*");
        Response.AddHeader("Access-Control-Allow-Methods", "GET,POST,PUT,OPTIONS,DELETE");
    }
}

Xcode source automatic formatting

That's Ctrl + i.

Or for low-tech, cut and then paste. It'll reformat on paste.

Swift Alamofire: How to get the HTTP response status code

Or use pattern matching

if let error = response.result.error as? AFError {
   if case .responseValidationFailed(.unacceptableStatusCode(let code)) = error {
       print(code)
   }
}

how to install gcc on windows 7 machine?

Following up on Mat's answer (use Cygwin), here are some detailed instructions for : installing gcc on Windows The packages you want are gcc, gdb and make. Cygwin installer lets you install additional packages if you need them.

How do you find the row count for all your tables in Postgres

I made a small variation to include all tables, also for non-public tables.

CREATE TYPE table_count AS (table_schema TEXT,table_name TEXT, num_rows INTEGER); 

CREATE OR REPLACE FUNCTION count_em_all () RETURNS SETOF table_count  AS '
DECLARE 
    the_count RECORD; 
    t_name RECORD; 
    r table_count%ROWTYPE; 

BEGIN
    FOR t_name IN 
        SELECT table_schema,table_name
        FROM information_schema.tables
        where table_schema !=''pg_catalog''
          and table_schema !=''information_schema''
        ORDER BY 1,2
        LOOP
            FOR the_count IN EXECUTE ''SELECT COUNT(*) AS "count" FROM '' || t_name.table_schema||''.''||t_name.table_name
            LOOP 
            END LOOP; 

            r.table_schema := t_name.table_schema;
            r.table_name := t_name.table_name; 
            r.num_rows := the_count.count; 
            RETURN NEXT r; 
        END LOOP; 
        RETURN; 
END;
' LANGUAGE plpgsql;

use select count_em_all(); to call it.

Hope you find this usefull. Paul

Using strtok with a std::string

It fails because str.c_str() returns constant string but char * strtok (char * str, const char * delimiters ) requires volatile string. So you need to use *const_cast< char > inorder to make it voletile. I am giving you a complete but small program to tokenize the string using C strtok() function.

   #include <iostream>
   #include <string>
   #include <string.h> 
   using namespace std;
   int main() {
       string s="20#6 5, 3";
       // strtok requires volatile string as it modifies the supplied string in order to tokenize it 
       char *str=const_cast< char *>(s.c_str());    
       char *tok;
       tok=strtok(str, "#, " );     
       int arr[4], i=0;    
       while(tok!=NULL){
           arr[i++]=stoi(tok);
           tok=strtok(NULL, "#, " );
       }     
       for(int i=0; i<4; i++) cout<<arr[i]<<endl;


       return 0;
   }

NOTE: strtok may not be suitable in all situation as the string passed to function gets modified by being broken into smaller strings. Pls., ref to get better understanding of strtok functionality.

How strtok works

Added few print statement to better understand the changes happning to string in each call to strtok and how it returns token.

#include <iostream>
#include <string>
#include <string.h> 
using namespace std;
int main() {
    string s="20#6 5, 3";
    char *str=const_cast< char *>(s.c_str());    
    char *tok;
    cout<<"string: "<<s<<endl;
    tok=strtok(str, "#, " );     
    cout<<"String: "<<s<<"\tToken: "<<tok<<endl;   
    while(tok!=NULL){
        tok=strtok(NULL, "#, " );
        cout<<"String: "<<s<<"\t\tToken: "<<tok<<endl;
    }
    return 0;
}

Output:

string: 20#6 5, 3

String: 206 5, 3    Token: 20
String: 2065, 3     Token: 6
String: 2065 3      Token: 5
String: 2065 3      Token: 3
String: 2065 3      Token:

strtok iterate over the string first call find the non delemetor character (2 in this case) and marked it as token start then continues scan for a delimeter and replace it with null charater (# gets replaced in actual string) and return start which points to token start character( i.e., it return token 20 which is terminated by null). In subsequent call it start scaning from the next character and returns token if found else null. subsecuntly it returns token 6, 5, 3.

Trim Cells using VBA in Excel

Works fine for me with one change - fourth line should be:

cell.Value = Trim(cell.Value)

Edit: If it appears to be stuck in a loop, I'd add

Debug.Print cell.Address

inside your For ... Next loop to get a bit more info on what's happening.

I also suspect that Trim only strips spaces - are you sure you haven't got some other kind of non-display character in there?

The program can't start because MSVCR110.dll is missing from your computer

I would like to quote an answer given by Microsoft support engineer at here:-

http://answers.microsoft.com/en-us/windows/forum/windows_8-winapps/the-program-cant-start-because-msvcr110dll-is/f052d325-3af9-4ae5-990b-b080799724db

Hi Henny, MSVCR110.dll is the Microsoft Visual C++ Redistributable dll that is needed for projects built with Visual Studio 2011. The dll letters spell this out. MS = Microsoft, V = Visual, C = C++, R = Redistributable For Winroy to get started, this file is probably needed. This error appears when you wish to run a software which require the Microsoft Visual C++ Redistributable 2012. The redistributable can easily be downloaded on the Microsoft website as x86 or x64 edition. Depending on the software you wish to install you need to install either the 32 bit or the 64 bit version. Refer the following link: http://www.microsoft.com/en-us/download/details.aspx?id=30679# Please let us know if the issue persists. We will be happy to assist you further. Thanks, Yaqub Khan - Microsoft Support Engineer

Is there a better way to do optional function parameters in JavaScript?

With ES2015/ES6 you can take advantage of Object.assign which can replace $.extend() or _.defaults()

function myFunc(requiredArg, options = {}) {
  const defaults = {
    message: 'Hello',
    color: 'red',
    importance: 1
  };

  const settings = Object.assign({}, defaults, options);

  // do stuff
}

You can also use defaults arguments like this

function myFunc(requiredArg, { message: 'Hello', color: 'red', importance: 1 } = {}) {
  // do stuff
}

Display unescaped HTML in Vue.js

Starting with Vue2, the triple braces were deprecated, you are to use v-html.

<div v-html="task.html_content"> </div>

It is unclear from the documentation link as to what we are supposed to place inside v-html, your variables goes inside v-html.

Also, v-html works only with <div> or <span> but not with <template>.

If you want to see this live in an app, click here.

Django - iterate number in for loop of a template

I think you could call the id, like this

{% for days in days_list %}
    <h2># Day {{ days.id }} - From {{ days.from_location }} to {{ days.to_location }}</h2>
{% endfor %}

How can I delete an item from an array in VB.NET?

The variable i represents the index of the element you want to delete:

System.Array.Clear(ArrayName, i, 1)

Inline style to act as :hover in CSS

If that <p> tag is created from JavaScript, then you do have another option: use JSS to programmatically insert stylesheets into the document head. It does support '&:hover'. https://cssinjs.org/

How to compare LocalDate instances Java 8

LocalDate ld ....;
LocalDateTime ldtime ...;

ld.isEqual(LocalDate.from(ldtime));

SSH Port forwarding in a ~/.ssh/config file?

You can use the LocalForward directive in your host yam section of ~/.ssh/config:

LocalForward 5901 computer.myHost.edu:5901

How to validate an Email in PHP?

User data is very important for a good developer, so don't ask again and again for same data, use some logic to correct some basic error in data.

Before validation of Email: First you have to remove all illegal characters from email.

//This will Remove all illegal characters from email
$email = filter_var($email, FILTER_SANITIZE_EMAIL);

after that validate your email address using this filter_var() function.

filter_var($email, FILTER_VALIDATE_EMAIL)) // To Validate the email

For e.g.

<?php
$email = "[email protected]";

// Remove all illegal characters from email
$email = filter_var($email, FILTER_SANITIZE_EMAIL);

// Validate email
if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
    echo $email." is a valid email address";
} else {
    echo $email." is not a valid email address";
}
?>

Ternary operator (?:) in Bash

if [ "$b" -eq 5 ]; then a="$c"; else a="$d"; fi

The cond && op1 || op2 expression suggested in other answers has an inherent bug: if op1 has a nonzero exit status, op2 silently becomes the result; the error will also not be caught in -e mode. So, that expression is only safe to use if op1 can never fail (e.g., :, true if a builtin, or variable assignment without any operations that can fail (like division and OS calls)).

Note the "" quotes. The first pair will prevent a syntax error if $b is blank or has whitespace. Others will prevent translation of all whitespace into single spaces.

How to initialize an array in one step using Ruby?

If you have an Array of strings, you can also initialize it like this:

array = %w{1 2 3}

just separate each element with any whitespace

Difference between window.location.href, window.location.replace and window.location.assign

These do the same thing:

window.location.assign(url);
window.location = url;
window.location.href = url;

They simply navigate to the new URL. The replace method on the other hand navigates to the URL without adding a new record to the history.

So, what you have read in those many forums is not correct. The assign method does add a new record to the history.

Reference: https://developer.mozilla.org/en-US/docs/Web/API/Window/location

Working copy XXX locked and cleanup failed in SVN

For me, the problem was with completely full disk drive (linux inodes in my case), when i deleted some folders it started working again.

The error was the following (on any svn action):

$ svn cleanup
svn: E155004: Run 'svn cleanup' to remove locks (type 'svn help cleanup' for details)
svn: E155004: Working copy locked; try running 'svn cleanup' on the root of the working copy ('/my/directory') instead.
svn: E155004: Working copy '/my/directory' locked
svn: E200030: sqlite[S14]: unable to open database file
svn: E200030: Additional errors:
svn: E200030: sqlite[S14]: unable to open database file

Stop Excel from automatically converting certain text values to dates

Still an issue in Microsoft Office 2016 release, rather disturbing for those of us working with gene names such as MARC1, MARCH1, SEPT1 etc. The solution I've found to be the most practical after generating a ".csv" file in R, that will then be opened/shared with Excel users:

Open the CSV file as text (notepad)
Copy it (ctrl+a, ctrl+c).
Paste it in a new excel sheet -it will all paste in one column as long text strings.
Choose/select this column.
Go to Data- "Text to columns...", on the window opened choose "delimited" (next). Check that "comma" is marked (marking it will already show the separation of the data to columns below) (next), in this window you can choose the column you want and mark it as text (instead of general) (Finish).

HTH

Why use def main()?

if the content of foo.py

print __name__
if __name__ == '__main__':
    print 'XXXX'

A file foo.py can be used in two ways.

imported in another file : import foo

In this case __name__ is foo, the code section does not get executed and does not print XXXX.

executed directly : python foo.py

When it is executed directly, __name__ is same as __main__ and the code in that section is executed and prints XXXX

One of the use of this functionality to write various kind of unit tests within the same module.

What is VanillaJS?

This word, hence, VanillaJS is a just damn joke that changed my life. I had gone to a German company for an interview, I was very poor in JavaScript and CSS, very poor, so the Interviewer said to me: We're working here with VanillaJs, So you should know this framework.

Definitely, I understood that I'was rejected, but for one week I seek for VanillaJS, After all, I found THIS LINK.

What I am just was because of that joke.

VanillaJS === plain `JavaScript`

Why is Visual Studio 2013 very slow?

There is a good workaround for this solution if you are experiencing slowness in rendering the .cs files and .cshtml files.

Just close all the files opened so that the cache gets cleared and open the required files again.

What is the syntax for Typescript arrow functions with generics?

I to use this type of declaration:

const identity: { <T>(arg: T): T } = (arg) => arg;

It allows defining additional props to your function if you ever need to and in some cases, it helps keeping the function body cleaner from the generic definition.

If you don't need the additional props (namespace sort of thing), it can be simplified to:

const identity: <T>(arg: T) => T = (arg) => arg;

Eclipse : Failed to connect to remote VM. Connection refused.

If you need to debug an application working on Tomcat, make sure that your Tomcat-folder/bin/startup.bat (if using windows) contains the following lines:

set JPDA_TRANSPORT="dt_socket"
set JPDA_ADDRESS=8000

call "%EXECUTABLE%" jpda start %CMD_LINE_ARGS%

How to reload a page using JavaScript

To make it easy and simple, use location.reload(). You can also use location.reload(true) if you want to grab something from the server.

How to use glyphicons in bootstrap 3.0

There you go:

<i class="glyphicon glyphicon-search"></i>

More information:

http://getbootstrap.com/components/#glyphicons

Btw. you can use this conversion tool, this will also update the code for the icons:

"[notice] child pid XXXX exit signal Segmentation fault (11)" in apache error.log

Have you tried to increase output_buffering in your php.ini?

What does "zend_mm_heap corrupted" mean?

Count unique values in a column in Excel

With the Dynamic Array formulas(as of this posting only available to Office 365 Insiders):

=COUNTA(UNIQUE(A:A))

How to format a phone number with jQuery

To expand on Cruz Nunez code and add continual formatting, plus include some international phone number formats.

    $('#phone').on('input', function() {
      var number = $(this).val().replace(/[^\d]/g, '');
      if (number.length == 3) {
        number = number.replace(/(\d{3})/, "$1-");
      } else if (number.length == 4) {
        number = number.replace(/(\d{3})(\d{1})/, "$1-$2");
      } else if (number.length == 5) {
        number = number.replace(/(\d{3})(\d{2})/, "$1-$2");
      } else if (number.length == 6) {
        number = number.replace(/(\d{3})(\d{3})/, "$1-$2-");
      } else if (number.length == 7) {
        number = number.replace(/(\d{3})(\d{3})(\d{1})/, "$1-$2-$3");
      } else if (number.length == 8) {
        number = number.replace(/(\d{4})(\d{4})/, "$1-$2");
      } else if (number.length == 9) {
        number = number.replace(/(\d{3})(\d{3})(\d{3})/, "$1-$2-$3");
      } else if (number.length == 10) {
        number = number.replace(/(\d{3})(\d{3})(\d{4})/, "$1-$2-$3");
      } else if (number.length == 11) {
        number = number.replace(/(\d{1})(\d{3})(\d{3})(\d{4})/, "$1-$2-$3-$4");
      } else if (number.length == 12) {
        number = number.replace(/(\d{2})(\d{3})(\d{3})(\d{4})/, "$1-$2-$3-$4");
      }
      $(this).val(number);
    });

How to add multiple font files for the same font?

/*
# +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
# dejavu sans
# +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
*/
/*default version*/
@font-face {
    font-family: 'DejaVu Sans';
    src: url('dejavu/DejaVuSans.ttf'); /* IE9 Compat Modes */
    src: 
        local('DejaVu Sans'),
        local('DejaVu-Sans'), /* Duplicated name with hyphen */
        url('dejavu/DejaVuSans.ttf') 
        format('truetype');
}
/*bold version*/
@font-face {
    font-family: 'DejaVu Sans';
    src: url('dejavu/DejaVuSans-Bold.ttf'); 
    src: 
        local('DejaVu Sans'),
        local('DejaVu-Sans'),
        url('dejavu/DejaVuSans-Bold.ttf') 
        format('truetype');
    font-weight: bold;
}
/*italic version*/
@font-face {
    font-family: 'DejaVu Sans';
    src: url('dejavu/DejaVuSans-Oblique.ttf'); 
    src: 
        local('DejaVu Sans'),
        local('DejaVu-Sans'),
        url('dejavu/DejaVuSans-Oblique.ttf') 
        format('truetype');
    font-style: italic;
}
/*bold italic version*/
@font-face {
    font-family: 'DejaVu Sans';
    src: url('dejavu/DejaVuSans-BoldOblique.ttf'); 
    src: 
        local('DejaVu Sans'),
        local('DejaVu-Sans'),
        url('dejavu/DejaVuSans-BoldOblique.ttf') 
        format('truetype');
    font-weight: bold;
    font-style: italic;
}

How to resolve "The requested URL was rejected. Please consult with your administrator." error?

I have faced the same issue using Google Chrome browser. Same website was opening normally using the incognito mode and different browsers. At first, I cleared cached files and cookies over the past 24 hours, but this didn't help.

I realized that my first visit to the website was during the past 10 days. So, I cleared cached files and cookies over the past 4 weeks and that resolved the problem.
Note: I didn't clear my browsing history data

Dictionaries and default values

Create dataframe from a matrix

You can use stack from the base package. But, you need first to coerce your matrix to a data.frame and to reorder the columns once the data is stacked.

mat <- as.data.frame(mat)
res <- data.frame(time= mat$time,stack(mat,select=-time))
res[,c(3,1,2)]

  ind time values
1 C_0  0.0    0.1
2 C_0  0.5    0.2
3 C_0  1.0    0.3
4 C_1  0.0    0.3
5 C_1  0.5    0.4
6 C_1  1.0    0.5

Note that stack is generally more efficient than the reshape2 package.

How to count no of lines in text file and store the value into a variable using batch script?

You could use the FOR /F loop, to assign the output to a variable.

I use the cmd-variable, so it's not neccessary to escape the pipe or other characters in the cmd-string, as the delayed expansion passes the string "unchanged" to the FOR-Loop.

@echo off
cls
setlocal EnableDelayedExpansion
set "cmd=findstr /R /N "^^" file.txt | find /C ":""

for /f %%a in ('!cmd!') do set number=%%a
echo %number%

How to clear the JTextField by clicking JButton

Looking for EventHandling, ActionListener?

or code?

JButton b = new JButton("Clear");
b.addActionListener(new ActionListener(){
    public void actionPerformed(ActionEvent e){
        textfield.setText("");
        //textfield.setText(null); //or use this
    }
});

Also See
How to Use Buttons

Creating a simple configuration file and parser in C++

A naive approach could look like this:

#include <map>
#include <sstream>
#include <stdexcept>
#include <string>

std::map<std::string, std::string> options; // global?

void parse(std::istream & cfgfile)
{
    for (std::string line; std::getline(cfgfile, line); )
    {
        std::istringstream iss(line);
        std::string id, eq, val;

        bool error = false;

        if (!(iss >> id))
        {
            error = true;
        }
        else if (id[0] == '#')
        {
            continue;
        }
        else if (!(iss >> eq >> val >> std::ws) || eq != "=" || iss.get() != EOF)
        {
            error = true;
        }

        if (error)
        {
            // do something appropriate: throw, skip, warn, etc.
        }
        else
        {
            options[id] = val;
        }
    }
}

Now you can access each option value from the global options map anywhere in your program. If you want castability, you could make the mapped type a boost::variant.

How can I interrupt a running code in R with a keyboard command?

Try out Ctrl + z But it will kill the process, not suspend it.

Bootstrap get div to align in the center

In bootstrap you can use .text-centerto align center. also add .row and .col-md-* to your code.

align= is deprecated,

Added .col-xs-* for demo

_x000D_

<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css" rel="stylesheet" />
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" />
<div class="footer">
  <div class="container">
    <div class="row">
      <div class="col-xs-4">
        <p>Hello there</p>
      </div>
      <div class="col-xs-4 text-center">
        <a href="#" class="btn btn-warning" onclick="changeLook()">Re</a>
        <a href="#" class="btn btn-warning" onclick="changeBack()">Rs</a>
      </div>
      <div class="col-xs-4 text-right">
        <a href="#"><i class="fa fa-facebook-square fa-2x"></i></a>
        <a href="#"><i class="fa fa-twitter fa-2x"></i></a>
        <a href="#"><i class="fa fa-google-plus fa-2x"></i></a>
      </div>
    </div>
  </div>
</div>

_x000D_

UPDATE(OCT 2017)

For those who are reading this and want to use the new version of bootstrap (beta version), you can do the above in a simpler way, using Boostrap Flexbox utilities classes

_x000D_

<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css" rel="stylesheet" />
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" rel="stylesheet" />
<div class="container footer">
  <div class="d-flex justify-content-between">
    <div class="p-1">
      <p>Hello there</p>
    </div>
    <div class="p-1">
      <a href="#" class="btn btn-warning" onclick="changeLook()">Re</a>
      <a href="#" class="btn btn-warning" onclick="changeBack()">Rs</a>
    </div>
    <div class="p-1">
      <a href="#"><i class="fa fa-facebook-square fa-2x"></i></a>
      <a href="#"><i class="fa fa-twitter fa-2x"></i></a>
      <a href="#"><i class="fa fa-google-plus fa-2x"></i></a>
    </div>
  </div>
</div>

_x000D_

What is ViewModel in MVC?

If you have properties specific to the view, and not related to the DB/Service/Data store, it is a good practice to use ViewModels. Say, you want to leave a checkbox selected based on a DB field (or two) but the DB field itself isn't a boolean. While it is possible to create these properties in the Model itself and keep it hidden from the binding to data, you may not want to clutter the Model depending on the amount of such fields and transactions.

If there are too few view-specific data and/or transformations, you can use the Model itself

How to completely DISABLE any MOUSE CLICK

To disable all mouse click

var event = $(document).click(function(e) {
    e.stopPropagation();
    e.preventDefault();
    e.stopImmediatePropagation();
    return false;
});

// disable right click
$(document).bind('contextmenu', function(e) {
    e.stopPropagation();
    e.preventDefault();
    e.stopImmediatePropagation();
    return false;
});

to enable it again:

$(document).unbind('click');
$(document).unbind('contextmenu');

How to fix JSP compiler warning: one JAR was scanned for TLDs yet contained no TLDs?

For Tomcat 8, I had to add the following line to catalina.properties for preventing jars scanned by Tomcat:

tomcat.util.scan.StandardJarScanFilter.jarsToSkip=jsp-api.jar,servlet-api.jar

Writing data to a local text file with javascript

Our HTML:

<div id="addnew">
    <input type="text" id="id">
    <input type="text" id="content">
    <input type="button" value="Add" id="submit">
</div>

<div id="check">
    <input type="text" id="input">
    <input type="button" value="Search" id="search">
</div>

JS (writing to the txt file):

function writeToFile(d1, d2){
    var fso = new ActiveXObject("Scripting.FileSystemObject");
    var fh = fso.OpenTextFile("data.txt", 8, false, 0);
    fh.WriteLine(d1 + ',' + d2);
    fh.Close();
}
var submit = document.getElementById("submit");
submit.onclick = function () {
    var id      = document.getElementById("id").value;
    var content = document.getElementById("content").value;
    writeToFile(id, content);
}

checking a particular row:

function readFile(){
    var fso = new ActiveXObject("Scripting.FileSystemObject");
    var fh = fso.OpenTextFile("data.txt", 1, false, 0);
    var lines = "";
    while (!fh.AtEndOfStream) {
        lines += fh.ReadLine() + "\r";
    }
    fh.Close();
    return lines;
}
var search = document.getElementById("search");
search.onclick = function () {
    var input   = document.getElementById("input").value;
    if (input != "") {
        var text    = readFile();
        var lines   = text.split("\r");
        lines.pop();
        var result;
        for (var i = 0; i < lines.length; i++) {
            if (lines[i].match(new RegExp(input))) {
                result = "Found: " + lines[i].split(",")[1];
            }
        }
        if (result) { alert(result); }
        else { alert(input + " not found!"); }
    }
}

Put these inside a .hta file and run it. Tested on W7, IE11. It's working. Also if you want me to explain what's going on, say so.

What are App Domains in Facebook Apps?

In this example:

http://www.example.com:80/somepage?parameter1="hello"&parameter2="world"

the bold part is the Domainname. 80 is rarely included. I post it since many people may wonder if 3000 or some other port is part of the domain if their not staging their app for production yet. Normally you don't specify it since 80 is the default, but if you just want to specify localhost just do it without the port number, it works just as fine. The adress, though, should be http://localhost:3000 (if you have it on that port).

ORA-12505, TNS:listener does not currently know of SID given in connect descriptor

I have faced the same issue and solved by restart the OracleServiceXE service. Goto Services.msc and then verify the 'OracleServiceXE' service is UP and running

Error:Execution failed for task ':app:compileDebugKotlin'. > Compilation error. See log for more details

In my case, I attempted to upgrade play_servicesand firebase versions to 15.0. Going back to 11.4.2 fixed my issue...

Font-awesome, input type 'submit'

Well, technically it's not possible to get :before and :after pseudo elements work on input elements

From W3C:

12.1 The :before and :after pseudo-elements

Authors specify the style and location of generated content with the :before and :after pseudo-elements. As their names indicate, the :before and :after pseudo-elements specify the location of content before and after an element's document tree content. The 'content' property, in conjunction with these pseudo-elements, specifies what is inserted.

So I had a project where I had submit buttons in the form of input tags and for some reason the other developers restricted me to use <button> tags instead of the usual input submit buttons, so I came up with another solution, of wrapping the buttons inside a span set to position: relative; and then absolutely positioning the icon using :after pseudo.

Note: The demo fiddle uses the content code for FontAwesome 3.2.1 so you may need to change the value of content property accordingly.

HTML

<span><input type="submit" value="Send" class="btn btn-default" /></span>

CSS

input[type="submit"] {
    margin: 10px;
    padding-right: 30px;
}

span {
    position: relative;
}

span:after {
    font-family: FontAwesome;
    content: "\f004"; /* Value may need to be changed in newer version of font awesome*/
    font-size: 13px;
    position: absolute;
    right: 20px;
    top: 1px;
    pointer-events: none;
}

Demo

Now here everything is self explanatory here, about one property i.e pointer-events: none;, I've used that because on hovering over the :after pseudo generated content, your button won't click, so using the value of none will force the click action to go pass through that content.

From Mozilla Developer Network :

In addition to indicating that the element is not the target of mouse events, the value none instructs the mouse event to go "through" the element and target whatever is "underneath" that element instead.

Hover the heart font/icon Demo and see what happens if you DON'T use pointer-events: none;

What should I do when 'svn cleanup' fails?

It's possible that you have a problem with two filenames differing only by uppercase. If you ran into this problem, creating another working copy directory does not solve the problem.

Current Windows (i.e. crappy) filesystems simply do not grok the difference between Filename and FILEname. You have two possible fixes:

Check out at platform with a real filesystem (Unix-based), rename the file, and commit changes.
When you are stocked to Windows you can rename files in the Eclipse SVN repository browser which does recognise the difference and rename the file there.
You can rename the problematic files also remotely from any command-line SVN client using svn rename -m "broken filename case" http://server/repo/FILEname http://server/repo/filename

How to add a progress bar to a shell script?

I had the same thing to do today and based on Diomidis answer, here is how I did it (linux debian 6.0.7). Maybe, that could help you :

#!/bin/bash

echo "getting script inode"
inode=`ls -i ./script.sh | cut -d" " -f1`
echo $inode

echo "getting the script size"
size=`cat script.sh | wc -c`
echo $size

echo "executing script"
./script.sh &
pid=$!
echo "child pid = $pid"

while true; do
        let offset=`lsof -o0 -o -p $pid | grep $inode | awk -F" " '{print $7}' | cut -d"t" -f 2`
        let percent=100*$offset/$size
        echo -ne " $percent %\r"
done

Programs & Examples On #Luaj

How can I see the raw SQL queries Django is running?

HTML / CSS table with GRIDLINES

How to catch and print the full exception traceback without halting/exiting the program?

Undefined or null for AngularJS

Could not find main class HelloWorld

How do I convert datetime to ISO 8601 in PHP

Java int to String - Integer.toString(i) vs new Integer(i).toString()

How can I tell what edition of SQL Server runs on the machine?

How to set css style to asp.net button?

Vertical divider CSS

How do I check if an object has a specific property in JavaScript?

RS256 vs HS256: What's the difference?

getContext is not a function

With android studio no jvm found, JAVA_HOME has been set

Access-Control-Allow-Origin: * in tomcat

java.lang.NoClassDefFoundError: com/sun/mail/util/MailLogger for JUnit test case for Java mail

Replacing characters in Ant property

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

Spring not autowiring in unit tests with JUnit

How to POST JSON request using Apache HttpClient?

Delete empty rows

Why do I get a warning icon when I add a reference to an MEF plugin project?

How to set initial value and auto increment in MySQL?

How to send a GET request from PHP?

Is it possible to import modules from all files in a directory, using a wildcard?

What's the C++ version of Java's ArrayList

How to update a single library with Composer?

go to character in vim

How to change 1 char in the string?

Change <br> height using CSS

How to split a string to 2 strings in C

Crystal Reports - Adding a parameter to a 'Command' query

How to cast List<Object> to List<MyClass>

What does 'killed' mean when a processing of a huge CSV with Python, which suddenly stops?

What is the difference between new/delete and malloc/free?

foreach for JSON array , syntax

mysql after insert trigger which updates another table's column

How do I convert number to string and pass it as argument to Execute Process Task?

Equivalent of Oracle's RowID in SQL Server

Twitter Bootstrap modal: How to remove Slide down effect

Register DLL file on Windows Server 2008 R2

How to set custom header in Volley Request

Random string generation with upper case letters and digits

sendmail: how to configure sendmail on ubuntu?

Getting a list of associative array keys

How to switch from the default ConstraintLayout to RelativeLayout in Android Studio

Create a new Layout

ORA-12170: TNS:Connect timeout occurred

Delete the first five characters on any line of a text file in Linux with sed

Single Page Application: advantages and disadvantages

Visual Studio can't build due to rc.exe

SELECT * FROM X WHERE id IN (...) with Dapper ORM

How can I get a list of locally installed Python modules?

error: request for member '..' in '..' which is of non-class type

How to use color picker (eye dropper)?

How to convert String to Date value in SAS?

Convert date to UTC using moment.js

XSLT - How to select XML Attribute by Attribute?

How often does python flush to a file?

Laravel 5.4 create model, controller and migration in single artisan command

svn cleanup: sqlite: database disk image is malformed

remove space between paragraph and unordered list

virtualbox Raw-mode is unavailable courtesy of Hyper-V windows 10

Val and Var in Kotlin

Print current call stack from a method in Python code

What is console.log?

How to use AND in IF Statement

How to add "active" class to wp_nav_menu() current menu item (simple way)

.NET console application as Windows service

How to check db2 version

Angularjs action on click of button

Calling functions in a DLL from C++

Is it possible to access to google translate api for free?

Convert string into integer in bash script - "Leading Zero" number error

Detect whether Office is 32bit or 64bit via the registry

Is it possible to get the index you're sorting over in Underscore.js?

How do I print bytes as hexadecimal?

How do I get a file extension in PHP?

Sorry... "Short Question; But NOT Short Answer"