Tutorial by Examples: r

With Mongoose, everything is derived from a Schema. Lets create a schema. var mongoose = require('mongoose'); var Schema = mongoose.Schema; var AutoSchema = new Schema({ name : String, countOf: Number, }); // defining the document structure // by default the collection...

For inserting a new document in the collection, we create a object of the schema. var Auto = require('models/auto') var autoObj = new Auto({ name: "NewName", countOf: 10 }); We save it like the following autoObj.save(function(err, insertedAuto) { if (err) return cons...

Reading Data from the collection is very easy. Getting all data of the collection. var Auto = require('models/auto') Auto.find({}, function (err, autos) { if (err) return console.error(err); // will return a json array of all the documents in the collection console.log(autos)...

You can use plugman command to install/uninstall custom cordova plugins. To install plugman npm install -g plugman Install plugin command syntax: plugman <install|uninstall> --platform <ios|android|blackberry10|wp8> --project <directory> --plugin <name|url|path> Exa...

The names of modules follow the filesystem's hierarchical structure. With the following file layout: Foo/ ├── Baz/ │ └── Quux.hs └── Bar.hs Foo.hs Bar.hs the module headers would look like this: -- file Foo.hs module Foo where -- file Bar.hs module Bar where -- file Foo/Bar.hs m...

systemd provides a modern implementation of cron. To execute a script periodical a service and a timer file ist needed. The service and timer files should be placed in /etc/systemd/{system,user}. The service file: [Unit] Description=my script or programm does the very best and this is the descri...

Detailed instructions on getting slick set up or installed. http://kenwheeler.github.io/slick/ Slick Slider is easy to use and to customise. It provides good amount of customisation options including responsive options based on breakpoints. To get started with slick, it is not that difficult. Jus...

C# Visual Studio 2015 (latest update) - you can download the community version here for free: www.VisualStudio.com Important: update all VS extensions to their latest versions Tools->Extensions and Updates->Updates Download the Bot Application template from here: Template Dow...

Below is a configuration file for log4j. Log4j2 can use the same syntax, but there are different appender classes: log4j.rootLogger=INFO, FOO ## ConsoleAppender log4j.appender.CA=org.apache.log4j.ConsoleAppender log4j.appender.CA.layout=org.apache.log4j.PatternLayout log4j.appender.CA.layout....

XML Example The below configuration configures two appenders (log output). The first logs to standard system output (console) and the other logs to file. In this example, the location of the file can be set statically in configuration (appender file) or dynamically via maven filtering feature (<...

Recursive functions can get quite expensive. If they are pure functions (functions that always return the same value when called with the same arguments, and that neither depend on nor modify external state), they can be made considerably faster at the expense of memory by storing the values already...

There are different variable types for different purposes. In Visual Basic 6 the following variable types are available: Array Boolean Byte Currency Date Double Integer Long Single String Variant You declare a variable by using the Dim keyword: Dim RandomNumber As Integer If you ...

update <SCHEMA_NAME>.<TABLE_NAME_1> AS A SET <COLUMN_1> = True FROM <SCHEMA_NAME>.<TABLE_NAME_2> AS B WHERE A.<COLUMN_2> = B.<COLUMN_2> AND A.<COLUMN_3> = B.<COLUMN_3>

Monthwise difference between two dates(timestamp) select ( (DATE_PART('year', AgeonDate) - DATE_PART('year', tmpdate)) * 12 + (DATE_PART('month', AgeonDate) - DATE_PART('month', tmpdate)) ) from dbo."Table1" Yearwise difference between two dates...

Conditions: package should be at least installed. If not loaded in the current session, not a problem. ## Checking package version which was installed at past or ## installed currently but not loaded in the current session packageVersion("seqinr") # [1] ‘3.3.3’ packageVer...

To check the list of loaded packages search() OR (.packages())

A frequent reason why your read operation may not work is because your security rules reject the operation, for example because you're not authenticated (by default a database can only be accessed by an authenticated user). You can see these security rule violations in the Console output. But it's ...

Model With EF Core, data access is performed using a model. A model is made up of entity classes and a derived context that represents a session with the database, allowing you to query and save data. You can generate a model from an existing database, hand code a model to match your database, or ...

The following table compares the features available(1) in EF Core and EF6.x. It is intended to give a high level comparison and does not list every feature, or attempt to give details on possible differences between how the same feature works. Creating a ModelEF6.xEF Core 1.0.0Basic modelling (cla...

<?php echo get_field('my_field_name', 123); ?> This will echo the value of "my_field_name" from the post with 123 as its ID.