async.series(tasks, afterTasksCallback) will execute a set of tasks. Each task are executed after another. If a task fails, async stops immediately the execution and jump into the main callback.
When tasks are finished successfully, async call the "master" callback with all errors and all...
async.waterfall(tasks, afterTasksCallback) will execute a set of tasks. Each task are executed after another, and the result of a task is passed to the next task. As async.series(), if a task fails, async stop the execution and call immediately the main callback.
When tasks are finished successfull...
SELECT name, caption as title, year, pages FROM books
UNION
SELECT name, title, year, 0 as pages FROM movies
When combining 2 record sets with different columns then emulate the missing ones with default values.
extern int var;
static int var; /* Undefined behaviour */
C11, §6.2.2, 7 says:
If, within a translation unit, the same identifier appears with both
internal and external linkage, the behavior is undefined.
Note that if an prior declaration of an identifier is visible then it'll have the pri...
Use the yum command to manage packages in Enterprise Linux-based operating systems:
yum install php
This installs a minimal install of PHP including some common features. If you need additional modules, you will need to install them separately. Once again, you can use yum to search for these pac...
Note:
There will be some Objective-c in this example..
We will make a wrapper to C++ in this example, So don't worry to much about it.
First start Xcode and create a project.
And select a Cocoa application
Delete all sources except the Info.plist file.(Your app won't work without it)
Creat...
To start, gemfiles require at least one source, in the form of the URL for a RubyGems server.
Generate a Gemfile with the default rubygems.org source by running bundle init. Use https so your connection to the server will be verified with SSL.
source 'https://rubygems.org'
Next, declare the gem...
You should always use <?php ?> tags or short-echo tags <?= ?>. Other variations (in particular, short tags <? ?>) should not be used as they are commonly disabled by system administrators.
When a file is not expected to produce output (the entire file is PHP code) the closing ?>...
You can use the header() function to instruct the browser to redirect to a different URL:
$url = 'https://example.org/foo/bar';
if (!headers_sent()) { // check headers - you can not send headers if they already sent
header('Location: ' . $url);
exit; // protects from code being executed afte...
git log --graph --pretty=format:'%C(red)%h%Creset -%C(yellow)%d%Creset %s %C(green)(%cr) %C(yellow)<%an>%Creset'
The format option allows you to specify your own log output format:
ParameterDetails%C(color_name)option colors the output that comes after it%h or %Habbreviates commit hash (us...
uses
System.Character;
var
S1, S2: string;
begin
S1 := 'Foo';
S2 := ToLower(S1); // Convert the string to lower-case
S1 := ToUpper(S2); // Convert the string to upper-case
The assignment operator = sets thr left hand operand's value to the value of right hand operand, and return that value:
int a = 3; // assigns value 3 to variable a
int b = a = 5; // first assigns value 5 to variable a, then does the same for variable b
Console.WriteLine(a = 3 + 4); // prints ...
To display "Some Text", use the command:
echo Some Text
This will output the string Some Text followed by a new line.
To display the strings On and Off (case insensitive) or the empty string, use a ( instead of white-space:
echo(ON
echo(
echo(off
This will output:
ON
off
...
The echo setting determines whether command echoing is on or off. This is what a sample program looks like with command echoing on (default):
C:\Windows\System32>echo Hello, World!
Hello, World!
C:\Windows\System32>where explorer
C:\Windows\System32\explorer.exe
C:\Windows\System32>...
install the required Microsoft.SqlServer.Types assembly; they are not installed by default, and are available from Microsoft here as "Microsoft® System CLR Types for Microsoft® SQL Server® 2012" - note that there are separate installers for x86 and x64.
install Dapper.EntityFramew...
Once the type handlers are registered, everything should work automatically, and you should be able to use these types as either parameters or return values:
string redmond = "POINT (122.1215 47.6740)";
DbGeography point = DbGeography.PointFromText(redmond,
DbGeography.DefaultCoordi...
When you wish to combine the results of multiple tables or queries with similar fields together into a single resulting data set without performing any relational joins (i.e. you want to list one dataset immediately after the other), you will use a UNION query. However, it is notable that these quer...
The http_build_query() will create a query string from an array or object. These strings can be appended to a URL to create a GET request, or used in a POST request with, for example, cURL.
$parameters = array(
'parameter1' => 'foo',
'parameter2' => 'bar',
);
$queryString = http_b...
When INSERTing, you can use OUTPUT INSERTED.ColumnName to get values from the newly inserted row, for example the newly generated Id - useful if you have an IDENTITY column or any sort of default or calculated value.
When programatically calling this (e.g., from ADO.net) you would treat it as a nor...
<PropertyGroup>
<!-- Definition of a Property named "TestCondition". A PropertyGroup may also be placed inside a Target. -->
<TestCondition>True</TestCondition>
</PropertyGroup>
<!-- This Target will run after the "Clean" Target, su...
