4.2.1.2.1. Class Annotations
@javax.persistence.Entity

Declares a class to be a data model entity.

Parameters:

  • name – the name of the entity, must begin with a prefix, separated by a $ sign. It is recommended to use a short name of the project as a prefix to form a separate namespace.

Example:

@Entity(name = "sales$Customer")
@javax.persistence.MappedSuperclass

Defines that the class is an ancestor for some entities and its attributes must be used as part of descendant entities. Such class is not associated with any particular database table.

@javax.persistence.Table

Defines database table for the given entity.

Parameters:

  • name – the table name

Example:

@Table(name = "SALES_CUSTOMER")
@javax.persistence.Embeddable

Defines an embedded entity stored in the same table as the owning entity.

@MetaClass annotation should be used to specify the entity name.

@javax.persistence.Inheritance

Defines the inheritance strategy to be used for an entity class hierarchy. It is specified on the entity class that is the root of the entity class hierarchy.

Parameters:

  • strategy – inheritance strategy, SINGLE_TABLE by default

javax.persistence.DiscriminatorColumn

Is used for defining a database column responsible for the distinction of entity types in the cases of SINGLE_TABLE and JOINED inheritance strategies.

Parameters:

  • name – the discriminator column name

  • discriminatorType – the discriminator column type

Example:

@DiscriminatorColumn(name = "TYPE", discriminatorType = DiscriminatorType.INTEGER)
@javax.persistence.DiscriminatorValue

Defines the discriminator column value for this entity.

Example:

@DiscriminatorValue("0")
@javax.persistence.PrimaryKeyJoinColumn

Is used in the case of JOINED inheritance strategy to specify a foreign key column for the entity which refers to the primary key of the ancestor entity.

Parameters:

  • name – the name of the foreign key column of the entity

  • referencedColumnName – the name of primary key column of the ancestor entity

Example:

@PrimaryKeyJoinColumn(name = "CARD_ID", referencedColumnName = "ID")
@NamePattern

Determines the way of getting the name of the instance returned by the Instance.getInstanceName() method.

The annotation value should be a string in the {0}|{1} format, where:

  • {0} – formatting string according to the String.format() rules, or this object method name with the prefix #. The method should return String and should have no parameters.

  • {1} – a list of field names separated by commas, corresponding to {0} format. If the method is used in {0}, the list of fields is still required as it forms the _minimal view.

Examples:

@NamePattern("%s|name")
@NamePattern("#getCaption|login,name")
@Listeners

Defines the list of listeners intended for reaction to the entity instance lifecycle events on the middle tier.

The annotation value should be a string or an array of strings containing class names of the listeners. See Entity Listeners.

The strings here are used instead of class references because classes of the listeners are contained only on middleware and are inaccessible for client code, while the classes of the entities are used on all tiers.

Examples:

@Listeners("com.haulmont.cuba.security.listener.UserEntityListener")
@Listeners({"com.company.sales.entity.FooListener","com.company.sales.entity.BarListener"})
@MetaClass

Is used for declaring non-persistent or embedded entity (meaning that @javax.persistence.Entity annotation cannot be applied)

Parameters:

  • name – the entity name, must begin with a prefix, separated by a $ sign. It is recommended to use a short name of the project as prefix to form a separate namespace.

Example:

@MetaClass(name = "sales$Customer")
@SystemLevel

Indicates that the entity is system only and should not be available for selection in various lists of entities, such as generic filter parameter types or dynamic attribute type.

@EnableRestore

Indicates that the entity instances are available for recovery after soft deletion on the core$Entity.restore screen available through the Administration > Data Recovery main menu item.

@TrackEditScreenHistory

Indicates that editor screens opening history will be recorded with the ability to display it on the sec$ScreenHistory.browse screen available through the Help > History main menu item.

@Extends

Indicates that the entity is an extension and it should be used everywhere instead of the base entity. See Functionality Extension.

@PostConstruct

This annotation can be specified for a method. Such method will be invoked right after the entity instance is created by the Metadata.create() method. This is convenient when instance initialization requires invocation of managed beans. For example, see Entity Fields Initialization.