Tutorial by Examples: r

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...

SET FOREIGN_KEY_CHECKS=0; -- Customers TRUNCATE `customer_address_entity`; TRUNCATE `customer_address_entity_datetime`; TRUNCATE `customer_address_entity_decimal`; TRUNCATE `customer_address_entity_int`; TRUNCATE `customer_address_entity_text`; TRUNCATE `customer_address_entity_varchar`; T...

SET FOREIGN_KEY_CHECKS = 0; TRUNCATE TABLE `catalog_product_bundle_option`; TRUNCATE TABLE `catalog_product_bundle_option_value`; TRUNCATE TABLE `catalog_product_bundle_selection`; TRUNCATE TABLE `catalog_product_entity_datetime`; TRUNCATE TABLE `catalog_product_entity_decimal`; TRUNCATE TAB...

{-# 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.

$store = Mage::app()->getStore(); $storeId = Mage::app()->getStore()->getStoreId(); $storeCode = Mage::app()->getStore()->getCode(); $websiteId = Mage::app()->getStore()->getWebsiteId(); $storeGroupId = Mage::app()->getStore()->getGroupId(); $storeName = Mage::app()-&...

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'...

The extern storage class specifier can modify a declaration in one of the three following ways, depending on context: It can be used to declare a variable without defining it. Typically, this is used in a header file for a variable that will be defined in a separate implementation file. // glo...

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...

This simple function can be used to get value from exactly one field one record query result Public Function getDataScalar(ssql As String) openConnection() Try Dim q As New MySqlCommand q.Connection = db q.CommandText = ssql getDataScalar = q.Execut...

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", ...

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: ...

Suppose we want to write a constraint which matches a number, but approximatively. Say, you are supposed to have 95 people in a survey, but 93 or 96 will do as well. We can write a custom constraint of the form: public class AlmostEqualToConstraint : Constraint { readonly int _expected; ...