Tutorial by Examples: i

Most examples show instantiating and holding a LazySingleton object until the owning application has terminated, even if that object is no longer needed by the application. A solution to this is to implement IDisposable and set the object instance to null as follows: public class LazySingleton : ID...

Creating a project in scala is very similar to creating one in java. Here is what the entry class should look like: package com.example.myplugin; //{$TopLevelDomain}.{$Domain}.{$PluginName} import org.bukkit.plugin.java.JavaPlugin import org.bukkit.command.CommandSender import org.bukkit.comma...

ghcjs can be invoked with the same command line arguments as ghc. The generated programs can be run directly from the shell with Node.js and SpiderMonkey jsshell. for example: $ ghcjs -o helloWorld helloWorld.hs $ node helloWorld.jsexe/all.js Hello world!

For the sake of readability, which will be useful for beginners when reading VB code as well for full time developers to maintain the code, we can use "Region" to set a region of the same set of events, functions, or variables: #Region "Events" Protected Sub txtPrice_TextCh...

$model = Mage::getModel('catalog/product')->getCollection() Filter based on store: $mode->addStoreFilter($storeId) Filter based on product type: $mode->addAttributeToFilter('type_id', 'configurable') $mode->addAttributeToFilter('type_id', 'simple') Filter based on status: $m...

Mage::helper('catalog/image')->init($item->getProduct(), 'thumbnail'); Mage::helper('catalog/image')->init($item->getProduct(), 'small_image'); Mage::helper('catalog/image')->init($item->getProduct(), 'image');

Mage::getModel('catalog/product_media_config')->getMediaUrl($product->getThumbnail()); //Thumbnail Mage::getModel('catalog/product_media_config')->getMediaUrl($product->getSmallImage()); //Small Image Mage::getModel('catalog/product_media_config')->getMediaUrl($product->getImage(...

$rootId = Mage::app()->getStore($storeId)->getRootCategoryId(); $categories = Mage::getModel('catalog/category')->getCollection() ->addAttributeToSelect('*') ->addFieldToFilter('path', array('like'=> "1/$rootId/%")) ->addAttributeToFilter('level', 2...

{-# LANGUAGE RecordWildCards #-} import Text.XML.Light data Package = Package { pOrderNo :: String , pOrderPos :: String , pBarcode :: String , pNumber :: String } -- | Create XML from a Package instance Node Package where node qn Package {..} = node qn [ un...

A static data member of the class may be fully defined within the class definition if it is declared inline. For example, the following class may be defined in a header. Prior to C++17, it would have been necessary to provide a .cpp file to contain the definition of Foo::num_instances so that it wou...

$isSecure = Mage::app()->getStore()->isCurrentlySecure(); This will return true if the current url is secure.

Custom attribute in sales related tables like: sales_flat_quote, sales_flat_order_item, sales_flat_order, etc table In your installation file sql/some_setup/mysql-install-0.1.0.php: <?php $installer = $this; $installer->startSetup(); $installer->addAttribute('quote', 'custom_field'...

Since a signal handler will be called by the kernel using the C calling convention, we must tell the compiler to use the C calling convention when compiling the function. volatile sig_atomic_t death_signal = 0; extern "C" void cleanup(int signum) { death_signal = signum; } int mai...

A C library header can usually be included into a C++ program, since most declarations are valid in both C and C++. For example, consider the following foo.h: typedef struct Foo { int bar; } Foo; Foo make_foo(int); The definition of make_foo is separately compiled and distributed with the...

An explicit instantiation definition creates and declares a concrete class, function, or variable from a template, without using it just yet. An explicit instantiation can be referenced from other translation units. This can be used to avoid defining a template in a header file, if it will only be i...

import sys from PyQt4.QtCore import * from PyQt4.QtGui import * def window(): app = QApplication(sys.argv) win = QDialog() b1 = QPushButton(win) b1.setText("Button1") b1.move(50,20) b1.clicked.connect(b1_clicked) b2 = QPushButton(win) b2.setText(&quot...

let col_1 = db.collection('col_1'); let col_2 = db.collection('col_2'); col_1 .aggregate([ { $match: { "_id": 1 } }, { $lookup: { from: "col_2", localField: "id", foreignField: "id", ...

retrieve all documents in a collection db.collection.find({}); retrieve documents in a collection using a condition ( similar to WHERE in MYSQL ) db.collection.find({key: value}); example db.users.find({email:"[email protected]"}); retrieve documents in a collection using Boole...

db.collection.findOne({}); the querying functionality is similar to find() but this will end execution the moment it finds one document matching its condition , if used with and empty object , it will fetch the first document and return it . findOne() mongodb api documentation

As node.js is often used to build API, proper CORS setting can be a life saver if you want to be able to request the API from different domains. In the exemple, we'll set it up for the wider configuration (authorize all request types from any domain. In your server.js after initializing express: ...