Creating Entities

This is the manual for older MicroStream versions (Version < 5.0).

The new documentation (Version >= 5.0) is located at:

https://docs.microstream.one/

Given is the following entity:

public interface Person extends Entity
{
	public String firstName();
	 
	public String lastName();
}

So how is it done? Since the code generator provides a creator, we can use it to create a new Person.

Person john = PersonCreator.New()
    .firstName("John")
    .lastName("Doe")
    .create();

Let's see what the debugger displays if we run this code:

There's always an entity chain, with

• The identity (PersonEntity) as outer layer

• Then the logic layers, none here in our example

• And the inner most layer is always the data (PersonData), which holds the properties.

The properties can be accessed like defined in the entity's interface:

String firstName = john.firstName(); // -> John
String lastName  = john.lastName();  // -> Doe 

The creator can also be used to create copies. Just hand over the existing one as template:

Person mike = PersonCreator.New(john) // use John as template
			.firstName("Mike")
			.create();

This will create a "Mike Doe".