Tutorial by Examples: er

The services lifecycle has the following callbacks onCreate() : Executed when the service is first created in order to set up the initial configurations you might need. This method is executed only if the service is not already running. onStartCommand() : Executed every time startService...

c := exec.Command(name, arg...) b := &bytes.Buffer{} c.Stdout = b c.Stdin = stdin if err := c.Start(); err != nil { return nil, err } timedOut := false intTimer := time.AfterFunc(timeout, func() { log.Printf("Process taking too long. Interrupting: %s %s", name, strings...

To make all the characters in a String uppercase or lowercase: 2.2 let text = "AaBbCc" let uppercase = text.uppercaseString // "AABBCC" let lowercase = text.lowercaseString // "aabbcc" 3.0 let text = "AaBbCc" let uppercase = text.uppercased() // &qu...

In order to filter out values from an array and obtain a new array containing all the values that satisfy the filter condition, you can use the array_filter function. Filtering non-empty values The simplest case of filtering is to remove all "empty" values: $my_array = [1,0,2,null,3,'',...

$collection = Mage::getModel('catalog/product')->getCollection(); $collection->addAttributeToFilter('sku', array('like' => 'UX%'));

When a column name matches a reserved keyword, standard SQL requires that you enclose it in double quotation marks: SELECT "ORDER", ID FROM ORDERS Note that it makes the column name case-sensitive. Some DBMSes have proprietary ways of quoting names. For example, SQL Serve...

This will delete all rows that match the WHERE criteria. DELETE FROM Employees WHERE FName = 'John'

In Python 2, user input is accepted using the raw_input function, Python 2.x2.3 user_input = raw_input() While in Python 3 user input is accepted using the input function. Python 3.x3.0 user_input = input() In Python 2, the input function will accept input and interpret it. While this ...

When pattern matching an object whose type is a sealed trait, Scala will check at compile-time that all cases are 'exhaustively matched': sealed trait Shape case class Square(height: Int, width: Int) extends Shape case class Circle(radius: Int) extends Shape case object Point extends Shape ...

In many cases, the Razor parser is smart enough to figure out when the @ sign is meant to be used as part of code, as opposed to being part of something like an email address. In the example below, escaping the @ sign is not necessary: <p>Reach out to us at contact@mail.com</p> Howev...

Using environment variables is a widely used way to setting an app's config depending on it environment, as stated in The Twelve-Factor App. As configurations are likely to change between deployment environments, this is a very interesting way to modify the configuration without having to dig in th...

connection.Execute(@"some Query with @a,@b,@c", new {a=somevalueOfa,b=somevalueOfb,c=somevalueOfc});

Media Queries in Bootstrap allow you to move, show and hide content based on the viewport size. The following media queries are used in LESS files to create the key breakpoints in the Bootstrap grid system: /* Small devices (tablets, 768px and up) */ @media (min-width: @screen-sm-min) { ... } /...

You may add your new Seeder to the DatabaseSeeder class. /** * Run the database seeds. * * @return void */ public function run() { $this->call(UserTableSeeder::class); } To run a database seeder, use the Artisan command php artisan db:seed ...

You can reference models in a seeder. use DB; use App\Models\User; class UserTableSeeder extends Illuminate\Database\Seeder{ public function run(){ # Remove all existing entrie DB::table('users')->delete() ; User::create([ 'name' => 'Admin', ...

SELECT UPPER('HelloWorld') --returns 'HELLOWORLD' SELECT LOWER('HelloWorld') --returns 'helloworld'

We can provide a consumer that will be called with the multiple relevant values: C++11 template <class F> void foo(int a, int b, F consumer) { consumer(a + b, a - b, a * b, a / b); } // use is simple... ignoring some results is possible as well foo(5, 12, [](int sum, int , int , i...

// The Option type can either contain Some value or None. fn find(value: i32, slice: &[i32]) -> Option<usize> { for (index, &element) in slice.iter().enumerate() { if element == value { // Return a value (wrapped in Some). return Some(index);...

Here is an example of a service that greets people by the given name, and keeps track of how many users it encountered. See usage below. %% greeter.erl %% Greets people and counts number of times it did so. -module(greeter). -behaviour(gen_server). %% Export API Functions -export([start_link/0...

In PHP, a fatal error is a kind of error that cannot be caught, that is, after experiencing a fatal error a program does not resume. However, to log this error or somehow handle the crash you can use register_shutdown_function to register shutdown handler. function fatalErrorHandler() { // Let...