Tutorial by Examples: ed

Deferred execution enables combining different operations to build the final query, before evaluating the values: var list = new List<int>() {1,1,2,3,5,8}; var query = list.Select(x => x + 1); If we execute the query at this point: foreach (var x in query) { Console.Write($"...

With deferred execution, if the data to be queried is changed, the query object uses the data at the time of execution, not at the time of definition. var data = new List<int>() {2, 4, 6, 8}; var query = data.Select(x => x * x); If we execute the query at this point with an immediate m...

An enumerated type is a type that can hold one of a finite list of possible values. In Julia, enumerated types are typically called "enum types". For instance, one could use enum types to describe the seven days of the week, the twelve months of the year, the four suits of a standard 52-ca...

public class RedisPublisher extends RouteBuilder { public static final String CAMEL_REDIS_CHANNEL = "CamelRedis.Channel"; public static final String CAMEL_REDIS_MESSAGE = "CamelRedis.Message"; @Value("${redis.host}") private String redisHost; ...

public class RedisSubscriber extends RouteBuilder { @Value("${redis.host}") private String redisHost; @Value("${redis.port}") private int redisPort; @Value("${redis.channel.mychannel}") private String redisChannel; private Object b...

public class ManagedCamel implements Managed { public static final String REDIS_TEMPLATE = "redisTemplate"; public static final String LISTENER_CONTAINER = "listenerContainer"; public static final String REDIS_SERIALIZER = "redisSerializer"; privat...

All instances of an entity class with one of the class attributes matching a specified value can be retrieved as follows: public interface FooRepository extends CrudRepository<Foo, Long> { List<Foo> findAllByName(String name); } Invoking the findAllByName method results in the JP...

node_redis, as you may have guessed, is the Redis client for Node.js. You can install it via npm using the following command. npm install redis Once you have installed node_redis module you are good to go. Let’s create a simple file, app.js, and see how to connect with Redis from Node.js. app...

Checking the Existence of Keys Sometimes you may need to check if a key already exists and proceed accordingly. To do so you can use exists() function as shown below: client.exists('key', function(err, reply) { if (reply === 1) { console.log('exists'); } else { cons...

If you have create .Net class that represents some user-defined type, compiled it into .dll, and imported it into SQL server as an assembly, you can create user-defined function that references this class: CREATE TYPE dbo.Point EXTERNAL NAME MyLibrary.[Name.Space.Point] You need to specify name...

If you have created .Net method in some class, compiled it into .dll, and imported it into SQL server as an assembly, you can create user-defined stored procedure that references method in that assembly: CREATE PROCEDURE dbo.DoSomethng(@input nvarchar(max)) AS EXTERNAL NAME MyLibrary.[Name.Space....

Consider a base class Vehicle and its derived class Car as follows: #import <Foundation/Foundation.h> @interface Vehicle : NSObject { NSString *vehicleName; NSInteger vehicleModelNo; } - (id)initWithName:(NSString *)name andModel:(NSInteger)modelno; - (void)print; @end ...

This is literally the only thing you need to start using RxJava on Android. Include RxJava and RxAndroid in your gradle dependencies: // use the last version compile 'io.reactivex.rxjava2:rxjava:2.1.1' compile 'io.reactivex.rxjava2:rxandroid:2.0.1' RxAndroid main addition to RxJava is a Sche...

Format: [command] [> | >>] [filename] > saves the output of [command] into [filename]. >> appends the output of [command] into [filename]. Examples: echo Hello World > myfile.txt saves "Hello World" into myfile.txt echo your name is %name% >> myfi...

Set this attribute in your manifest's or element to enable or disable multi-window display: android:resizeableActivity=["true" | "false"] If this attribute is set to true, the activity can be launched in split-screen and freeform modes. If the attribute is set to false, the...

From an action controller: $this->getLayout()->getBlock('head')->getTemplate(); /** * Get specified tab grid */ public function gridOnlyAction() { $this->_initProduct(); $this->getResponse()->setBody( $this->getLayout()->createBlock('adminhtml/catalog_product_edit_...

Simple The Simple Products type should be used for that generally have a single configuration (one-size-fits-all). This might include items such as: A Box of Crayons, Small (24 Colors) A Box of Crayons, Large (64 Colors) SuperHighTech 26” HD Computer Monitor Barrack Obama Action Figure (6”) ...

PHPUnit has two assertions to check values of class properties: assertAttributeSame($expected, $actualAttributeName, $actualClassOrObject, $message = '') assertAttributeNotSame($expected, $actualAttributeName, $actualClassOrObject, $message = '') These methods will check the value of a object p...

SQL Server and SQLite allow to create indexes that contain not only a subset of columns, but also a subset of rows. Consider a constant growing amount of orders with order_state_id equal to finished (2), and a stable amount of orders with order_state_id equal to started (1). If your business make ...

I common problem encounter when scrapping a web is how to enter a userid and password to log into a web site. In this example which I created to track my answers posted here to stack overflow. The overall flow is to login, go to a web page collect information, add it a dataframe and then move to t...