Tutorial by Examples: b

Callback-based: db.notification.email.find({subject: 'promisify callback'}, (error, result) => { if (error) { console.log(error); } // normal code here }); This uses bluebird's promisifyAll method to promisify what is conventionally callback-based code like above. blueb...

A view is most useful when it can be used to pull in data from more than one table. CREATE VIEW myview AS SELECT a.*, b.extra_data FROM main_table a LEFT OUTER JOIN other_table b ON a.id = b.id In mysql views are not materialized. If you now perform the simple query SELECT * FROM myview, my...

PHP 5.x5.4 When you build REST API's, you may need to reduce the information of an object to be passed to the client application. For this purpose, this example illustrates how to use the JsonSerialiazble interface. In this example, the class User actually extends a DB model object of a hypotetica...

Laravel allows user work on multiple database connections. If you need to connect to multiple databases and make them work together, you are beware of the connection setup. You also allow using different types of database in the same application if you required. Default connection In config/dat...

Consider the following example assuming that you have a ';'-delimited CSV to load into your database. 1;max;male;manager;12-7-1985 2;jack;male;executive;21-8-1990 . . . 1000000;marta;female;accountant;15-6-1992 Create the table for insertion. CREATE TABLE `employee` ( `id` INT NOT NULL , ...

What if you want to rollback the latest migration i.e recent operation, you can use the awesome rollback command. But remember that this command rolls back only the last migration, which may include multiple migration files php artisan migrate:rollback If you are interested in rolling back all o...

Break and continue statements can be followed by an optional label which works like some kind of a goto statement, resumes execution from the label referenced position for(var i = 0; i < 5; i++){ nextLoop2Iteration: for(var j = 0; j < 5; j++){ if(i == j) break nextLoop2Iteration; ...

/// <summary> /// Creates simple button /// </summary> /// <param name="poHelper"></param> /// <param name="psValue"></param> /// <returns></returns> public static MvcHtmlString SubmitButton(this HtmlHelper poHelper, string ps...

Angular has reputation for having awesome bidirectional data binding. By default, Angular continuously synchronizes values bound between model and view components any time data changes in either the model or view component. This comes with a cost of being a bit slow if used too much. This will hav...

NSURL *url = [NSURL URLWithString:@"http://www.example.com/"]; NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration]; // Configure the session here. NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration]; [[s...

The setup on the app side requires two things: Configuring the app’s entitlement, and enabling the universal links by turning on the Associated Domains capability in the project. Handling Incoming Links in your AppDelegate. 1. Configuring the app’s entitlement, and enabling universal links. ...

Assuming we want to modify bit n of an integer primitive, i (byte, short, char, int, or long): (i & 1 << n) != 0 // checks bit 'n' i |= 1 << n; // sets bit 'n' to 1 i &= ~(1 << n); // sets bit 'n' to 0 i ^= 1 << n; // toggles the value of bit 'n' Us...

In addition to the default set of directives shipped in core, Vue.js also allows you to register custom directives. Custom directives provide a mechanism for mapping data changes to arbitrary DOM behavior. You can register a global custom directive with the Vue.directive(id, definition) method, pas...

In Index page change the following: error_reporting(E_ALL | E_STRICT); to error_reporting(E_ALL); Set $_SERVER['MAGE_IS_DEVELOPER_MODE'] = true and uncomment this line (remove the #) #ini_set('display_errors', 1); You can also Set Dev Mode using SetEnv in your .htaccess file To make th...

Creating and returning an image object by loading the image data from the file at the specified path. Example: UIImage *image = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:[cellCountry objectForKey:@"Country_Flag"] ofType:nil]]; Using Array: Example NSM...

Template <div id="example"> a={{ a }}, b={{ b }} </div> JavaScript var vm = new Vue({ el: '#example', data: { a: 1 }, computed: { // a computed getter b: function () { // `this` points to the vm instance return this.a + 1 }...

The minimum required to use Webpack is the following command: webpack ./src/index.js ./dist/bundle.js // this is equivalent to: webpack source-file destination-file Web pack will take the source file, compile to the output destination and resolve any dependencies in the source files.

SP.SOD.executeOrDelayUntilScriptLoaded(showDialog,"sp.js"); function showDialog(){ var options = SP.UI.$create_DialogOptions(); options.url = "/mySite/lists/myList/NewForm.aspx"; options.dialogReturnValueCallback = myCallBackFunction; SP.UI.ModalDialog.show...

SP.SOD.executeOrDelayUntilScriptLoaded(myFunction,"sp.js"); function myFunction(){ var clientContext = new SP.ClientContext(); var list = clientContext.get_web().get_lists().getByTitle("List Title"); var item = list.getItemById(1); // get item with ID == 1 ...

Basic Example Use the set_viewXml method of the SP.CamlQuery object to specify a CAML query to retrieve items. SP.SOD.executeOrDelayUntilScriptLoaded(showListItems,"core.js"); function showListItems(){ var clientContext = new SP.ClientContext(); var list = clientContext.get_...