Tutorial by Examples: b

COPY products(is_public, title, discount) TO 'D:\csv_backup\products_db.csv' DELIMITER ',' CSV HEADER; COPY categories(name) TO 'D:\csv_backup\categories_db.csv' DELIMITER ',' CSV HEADER;

COPY products TO 'D:\csv_backup\products_db.csv' DELIMITER ',' CSV HEADER; COPY categories TO 'D:\csv_backup\categories_db.csv' DELIMITER ',' CSV HEADER;

Some applications may want to create so-called "Fire & Forget" tasks which can be periodically triggered and do not need to return any type of value returned upon completion of the assigned task (for example, purging old temp files, rotating logs, autosaving state). In this example, w...

3.3 Instancing can be done via modifications to how vertex attributes are provided to the vertex shader. This introduces a new way of accessing attribute arrays, allowing them to provide per-instance data that looks like a regular attribute. A single instance represents one object or group of vert...

ZeroR is a simple classifier. It doesn't operate per instance instead it operates on general distribution of the classes. It selects the class with the largest a priori probability. It is not a good classifier in the sense that it doesn't use any information in the candidate, but it is often used as...

In order to build a good classifier we will often need to get an idea of how the data is structered in feature space. Weka offers a visualisation module that can help. Some dimensions already seperate the classes quite well. Petal-width orders the concept quite neatly, when compared to petal-widt...

It is often necessary to execute a long-running task and use the result of that task once it has completed. In this example, we will create two classes: One which implements the Callable<T> interface (where T is the type we wish to return), and one which contains a main() method. AsyncValueT...

The S in S.O.L.I.D stands for Single responsibility principle(SRP). Responsibility means in this context reasons to change, so the principle states that a class should only have one reason to change. Robert C. Martin stated it (during his lecture at Yale shool of management in 10 Sep 2014) as foll...

Extend your class with Drawable and override these methods public class IconDrawable extends Drawable { /** * Paint for drawing the shape */ private Paint paint; /** * Icon drawable to be drawn to the center of the shape */ private Drawable icon; /**...

Let's say we have a String parameter and we want to split it by comma my_param="foo,bar,bash" To split this string by comma we can use; IFS=',' read -r -a array <<< "$my_param" Here, IFS is a special variable called Internal field separator which defines the char...

The most popular operating system for the Raspberry Pi is a Debian based Raspbian. It is officially supported by the Raspberry Pi Foundation. Raspbian can be downloaded from official Raspberry Pi site in one of two variants: With desktop environment Lite- Minimal image Starting September 20...

It is possible to create own Linux distribution using Yocto Project. For Raspberry Pi- there is a specific layer meta-raspberrypi that needs to be used to create an image.

Linux distribution with features required to run Kodi.

To leverage distributed cache, you'll have to reference one of the available implementations : Redis Sql server For instance you'll register Redis implemention as follows : public void ConfigureServices(IServiceCollection services) { services.AddDistributedRedisCache(options => ...

You can source configuration from environment variables by calling .AddEnvironmentVariables() on you ConfigurationBuilder. It will load environment variables prefixed with APPSETTING_ It will then use colon : as the key path separator. This means that : following environement settings : APPSETTI...

In order to be able to directly deploy web project changes to an Web Server, the following steps must be followed. If target server has Internet access, the process is quite simple, as Microsoft has a Web Platform package to do almost everything that is needed. Cleanup Make sure that C:\Progra...

While good software design often maximizes code reusability, sometimes it can be useful to define asynchronous tasks inline in your code via Lambda expressions to maximize code readability. In this example, we will create a single class which contains a main() method. Inside this method, we will us...

import com.couchbase.client.core.endpoint.SSLEngineFactory import com.couchbase.client.java.env.DefaultCouchbaseEnvironment import com.couchbase.client.java.CouchbaseCluster object CouchbaseConnection extends App { //Create default environment object. //Set the keystone file path(downlo...

At the very core, your entity main DAC must have GUID column (NoteID) to reference CSAnswers table and must have field that identify the class of the Entity. We will make use of Order Type to define list of attributes to gather particular order type-specific information. Create a Graph Extension f...

While using Image/Colour as an background in a CardView, You might end up with slight white paddings (If default Card colour is white) on the edges. This occurs due to the default rounded corners in the Card View. Here is how to avoid those margins in Pre-lollipop devices. We need to use an attribu...