Tutorial by Examples: d

There are frequent behavior patterns that can result in a lot of boilerplate code. By declaring a method that takes a Closure as a parameter, you can simplify your program. As an example, it is a common pattern to retrieve a database connection, start a transaction, do work, and then either commit ...

Model: public class SampleViewModel { public HttpPostedFileBase file {get;set;} } View: @model HelloWorldMvcApp.SampleViewModel @using (Html.BeginForm("Index","Home",FormMethod.Post, new { enctype = "multipart/form-data" })) { <div class="fo...

Files can be read byte- and line-wise using the Files class. Path p2 = Paths.get(URI.create("file:///home/testuser/File.txt")); byte[] content = Files.readAllBytes(p2); List<String> linesOfContent = Files.readAllLines(p2); Files.readAllLines() optionally takes a charset as para...

When making a bind of something, for example a date you may want to show it in a specific format without messing around with it in the code. To do this we can use the StringFormat property. Here are some examples: Text="{Binding Path=ReleaseDate, StringFormat=dddd dd MMMM yyyy}" This...

There is no single command to rename a MySQL database but a simple workaround can be used to achieve this by backing up and restoring: mysqladmin -uroot -p<password> create <new name> mysqldump -uroot -p<password> --routines <old name> | mysql -uroot -pmypassword <new na...

The following commands can be used to swap the names of two MySQL databases (<db1> and <db2>): mysqladmin -uroot -p<password> create swaptemp mysqldump -uroot -p<password> --routines <db1> | mysql -uroot -p<password> swaptemp mysqladmin -uroot -p<password&gt...

$ printf '%(%F)T\n' 2016-08-17

Lets create a simple transformation to convert a CSV into an XML file. Our Transformation has to do the following: Read the CSV file Build the greetings message Save the greetings in the XML file Create a Transformation: Here's how to start the Transformation: To the left of the works...

Pentaho Data Integration comes in two varieties: Community Edition (CE) - Free version for developers Enterprise Edition (EE) - Paid version for enterprise use Installation steps: You can download Pentaho Data Integration Community Edition from Sourceforge.net. For the Enterprise Editio...

C# inherits from C and C++ the usage of void* as a type-agnostic and size-agnostic pointer. void* ptr; Any pointer type can be assigned to void* using an implicit conversion: int* p1 = (int*)IntPtr.Zero; void* ptr = p1; The reverse requires an explicit conversion: int* p1 = (int*)IntPtr.Ze...

So, you have completed installation it's time now to Run you program with it. Netbeans has created a shortcut to your desktop, "Double click" that to open the IDE. To Create a new project 1. Click this button OR Goto: files >> New Project then this window will popup Select...

Digital hardware is built from two types of hardware primitives: Combinatorial gates (inverters, and, or, xor, 1-bit full adders, 1-bit multiplexers...) These logic gates perform a simple boolean computation on their inputs and produce an output. Each time one of their inputs changes, they st...

This example is the second of a series of 3. If you didn't yet, please read the Block diagram example first. With a block diagram that complies with the 10 rules (see the Block diagram example), the VHDL coding becomes straightforward: the large surrounding rectangle becomes the VHDL entity,...

This example is directly derived from John Cooley’s design contest at SNUG’95 (Synopsys Users Group meeting). The contest was intended to oppose VHDL and Verilog designers on the same design problem. What John had in mind was probably to determine what language was the most efficient. The result...

Implementation of IDatabaseInitializer that is used in EntityFramework by default. As the name implies, it creates the database if none exists. However when you change the model, it throws an exception. Usage: public class MyContext : DbContext { public MyContext() { Database.SetIni...

This implementation of IDatabaseInitializer drops and recreates the database if the model changes automatically. Usage: public class MyContext : DbContext { public MyContext() { Database.SetInitializer(new DropCreateDatabaseIfModelChanges<MyContext>()); } }

This implementation of IDatabaseInitializer drops and recreates the database everytime your context is used in applications app domain. Beware of the data loss due to the fact, that the database is recreated. Usage: public class MyContext : DbContext { public MyContext() { Database.S...

You can create your own implementation of IDatabaseInitializer. Example implementation of an initializer, that will migrate the database to 0 and then migrate all the way to the newest migration (usefull e.g. when running integration tests). In order to do that you would need a DbMigrationsConfigur...

An implementation of IDatabaseInitializer that will use Code First Migrations to update the database to the latest version. To use this initializer you have to use DbMigrationsConfiguration type too. Usage: public class MyContext : DbContext { public MyContext() { Database.SetInitial...

A complex type allows you to map selected fields of a database table into a single type that is a child of the main type. [ComplexType] public class Address { public string Street { get; set; } public string Street_2 { get; set; } public string City { get; set; } public string...