Tutorial by Examples: io

Dependency Inversion Principle C#

To understand Dependency Inversion Principle (DIP) we need to clear concept about Inversion Of Control(IOC) and Dependency Injection(DI). So here we discuss all about the terms with Dependency Inversion Principle (DIP). Inversion Of Control(IOC) : The control or logic which is not the part of t...

solid-principles • Dependency Inversion Principle (DIP)

Interface Segregation Principle C#

Here we give an example of ISP violation and then refactor that violation. Without talking unnecessary things let's jump into the code. ISP violation : public interface IMessage{ IList<string> ToAddress {get; set;} IList<string> BccAddresses {get; set;} string MessageBody {get; s...

solid-principles • Interface Segregation Principle (ISP)

Write documentation using docstrings

A docstring is a multi-line comment used to document modules, classes, functions and methods. It has to be the first statement of the component it describes. def hello(name): """Greet someone. Print a greeting ("Hello") for the person with the given name. &...

Python Language • Comments and Documentation

Create a Collection

First Select Or Create a database. > use mydb switched to db mydb Using db.createCollection("yourCollectionName") method you can explicitly create Collection. > db.createCollection("newCollection1") { "ok" : 1 } Using show collections command see all col...

MongoDB • Collections

Query Document - Using AND, OR and IN Conditions

All documents from students collection. > db.students.find().pretty(); { "_id" : ObjectId("58f29a694117d1b7af126dca"), "studentNo" : 1, "firstName" : "Prosen", "lastName" : "Ghosh", "age" ...

MongoDB • Querying for Data ( Getting Started )

Drop Collection

MongoDB's db.collection.drop() is used to drop a collection from the database. First, check the available collections into your database mydb. > use mydb switched to db mydb > show collections newCollection1 newCollection2 newCollection3 system.indexes Now drop the collection with...

MongoDB • Collections

Installation or Setup

Virtual Environment tool (virtualenv) is used to isolate different projects and their dependencies by creating individual python environments for each of them. It's like installing a package locally (and not globally), similar to npm package installation option. Following is an example to install ...

virtualenv • Getting started with virtualenv

Installation or Setup

Prerequisite A running MongoDB server, more details on that here. Setting Up a Java Project The MongoDB Java Driver is supplied as a JAR file and can be included in a project just like any other JAR. For example: Maven: add an entry to the <dependencies> section of your pom.xml. &lt...

mongodb-java • Getting started with mongodb-java

Schema Definition

In GraphQL the Schema defines the root execution queries and mutations as well as the types for your data. Schema Object Type The Person type has two fields, one is a standard Scalar type and the other represents a relationship to a list of other Person types that are 'friends'. Linking other type...

graphql • Getting started with graphql

find() method with Projection

The basic syntax of find() method with projection is as follows > db.COLLECTION_NAME.find({},{KEY:1}); If you want to show all documents without the age field then the command is as follows db.people.find({},{age : 0}); If you want to show all documents the age field then the command is a...

MongoDB • Querying for Data ( Getting Started )

Find() method with Projection

In MongoDB, projection means selecting only the necessary data rather than selecting whole of the data of a document. The basic syntax of find() method with projection is as follows > db.COLLECTION_NAME.find({},{KEY:1}); If you want to to show all document without the age field then the comm...

MongoDB • Querying for Data ( Getting Started )

Installation or Setup

Detailed instructions on getting optimization set up or installed.

optimization • Getting started with optimization

Installation or Setup

In order to install asyncio: pip install asyncio Notice that python asyncio requires Python 3.3 or later. This module became part of the Python standard library since Python 3.4.

python-asyncio • Getting started with python-asyncio

Block Registration

Registering blocks is done from your main mod class, or a ModBlocks class method invoked from the main mod class during preInit. Block myBlock = new CustomBlock(); string registryname = "my_block"; block.setRegistryName(registryname); block.setUnlocalizedName(block.getRegistryName().to...

minecraft • Creating a basic block with Forge

Bit Manipulation Application: Small to Capital Letter

One of several applications of bit manipulation is converting a letter from small to capital or vice versa by choosing a mask and a proper bit operation. For example, the a letter has this binary representation 01(1)00001 while its capital counterpart has 01(0)00001. They differ solely in the bit in...

C++ • Bit Manipulation

Installation or Setup

Create a file called hello.html with the following content: <!doctype html> <html> <head> <script src="//cdnjs.cloudflare.com/ajax/libs/dygraph/2.0.0/dygraph.js"></script> <link rel="stylesheet" href="https://cdnjs.cloudflare.com...

dygraphs • Getting started with dygraphs

Define custom exception, raise it and see where it comes from

To illustrate this, here is a function that has 3 different "wrong" behaviors the parameter is completely stupid: we use a user-defined expression the parameter has a typo: we use Oracle standard NO_DATA_FOUND error another, but not handled case Feel free to adapt it to your standa...

plsql • Exception Handling

Handling connexion error exceptions

Each standard Oracle error is associated with an error number. It's important to anticipate what could go wrong in your code. Here for a connection to another database, it can be: -28000 account is locked -28001 password expired -28002 grace period -1017 wrong user / password Here is a way ...

plsql • Exception Handling

Installation of Angular using angular-cli

This example is a quick setup of Angular and how to generate a quick example project. Prerequisites: Node.js 6.9.0 or greater. npm v3 or greater or yarn. Typings v1 or greater. Open a terminal and run the commands one by one: npm install -g typings or yarn global add typings npm install -...

Angular • Getting started with Angular

Creating an MSBuildWorspace, loading a solution and getting all the documents in all that solution

The MSBuildWorspace is built around the concept of handling MSBuild solutions (.sln files) and their respective projects (.csproj, .vbproj). Adding new projects and documents to this workspace is not supported. string solutionPath = @"C:\Path\To\Solution\Sample.sln"; MSBuildWorkspace ...

roslyn • Using Workspaces