/*
* Copyright (c) 2008, 2009, 2011 Oracle, Inc. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution. The Eclipse Public License is available
* at http://www.eclipse.org/legal/epl-v10.html and the Eclipse Distribution License
* is available at http://www.eclipse.org/org/documents/edl-v10.php.
*/
package javax.persistence;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
Specifies the table that is used for the mapping of
collections of basic or embeddable types. Applied
to the collection-valued field or property.
By default, the columns of the collection table that correspond
to the embeddable class or basic type are derived from the
attributes of the embeddable class or from the basic type according
to the default values of the Column annotation. In the case
of a basic type, the column name is derived from the name of the
collection-valued field or property. In the case of an embeddable
class, the column names are derived from the field or property
names of the embeddable class.
- To override the default properties of the column used for a
basic type, the
Column annotation is used on the
collection-valued attribute in addition to the
ElementCollection annotation.
- To override these defaults for an embeddable class, the
AttributeOverride and/or
AttributeOverrides annotations can be used in
addition to the ElementCollection annotation. If the
embeddable class contains references to other entities, the default
values for the columns corresponding to those references may be
overridden by means of the AssociationOverride and/or
AssociationOverrides annotations.
If the CollectionTable annotation is missing, the
default values of the CollectionTable annotation
elements apply.
Example:
@Embeddable public class Address {
protected String street;
protected String city;
protected String state;
...
}
@Entity public class Person {
@Id protected String ssn;
protected String name;
protected Address home;
...
@ElementCollection // use default table (PERSON_NICKNAMES)
@Column(name="name", length=50)
protected Set<String> nickNames = new HashSet();
...
}
@Entity public class WealthyPerson extends Person {
@ElementCollection
@CollectionTable(name="HOMES") // use default join column name
@AttributeOverrides({
@AttributeOverride(name="street",
column=@Column(name="HOME_STREET")),
@AttributeOverride(name="city",
column=@Column(name="HOME_CITY")),
@AttributeOverride(name="state",
column=@Column(name="HOME_STATE"))
})
protected Set<Address> vacationHomes = new HashSet();
...
}
See Also: - ElementCollection
- AttributeOverride
- AssociationOverride
- Column
Since: Java Persistence 2.0
/**
* Specifies the table that is used for the mapping of
* collections of basic or embeddable types. Applied
* to the collection-valued field or property.
* <p>
* <p>By default, the columns of the collection table that correspond
* to the embeddable class or basic type are derived from the
* attributes of the embeddable class or from the basic type according
* to the default values of the <code>Column</code> annotation. In the case
* of a basic type, the column name is derived from the name of the
* collection-valued field or property. In the case of an embeddable
* class, the column names are derived from the field or property
* names of the embeddable class.
* <ul>
* <li> To override the default properties of the column used for a
* basic type, the <code>Column</code> annotation is used on the
* collection-valued attribute in addition to the
* <code>ElementCollection</code> annotation.
* <p>
* <li> To override these defaults for an embeddable class, the
* <code>AttributeOverride</code> and/or
* <code>AttributeOverrides</code> annotations can be used in
* addition to the <code>ElementCollection</code> annotation. If the
* embeddable class contains references to other entities, the default
* values for the columns corresponding to those references may be
* overridden by means of the <code>AssociationOverride</code> and/or
* <code>AssociationOverrides</code> annotations.
* </ul>
* <p>
* <p> If the <code>CollectionTable</code> annotation is missing, the
* default values of the <code>CollectionTable</code> annotation
* elements apply.
* <p>
* <pre>
* Example:
*
* @Embeddable public class Address {
* protected String street;
* protected String city;
* protected String state;
* ...
* }
*
* @Entity public class Person {
* @Id protected String ssn;
* protected String name;
* protected Address home;
* ...
* @ElementCollection // use default table (PERSON_NICKNAMES)
* @Column(name="name", length=50)
* protected Set<String> nickNames = new HashSet();
* ...
* }
*
* @Entity public class WealthyPerson extends Person {
* @ElementCollection
* @CollectionTable(name="HOMES") // use default join column name
* @AttributeOverrides({
* @AttributeOverride(name="street",
* column=@Column(name="HOME_STREET")),
* @AttributeOverride(name="city",
* column=@Column(name="HOME_CITY")),
* @AttributeOverride(name="state",
* column=@Column(name="HOME_STATE"))
* })
* protected Set<Address> vacationHomes = new HashSet();
* ...
* }
* </pre>
*
* @see ElementCollection
* @see AttributeOverride
* @see AssociationOverride
* @see Column
* @since Java Persistence 2.0
*/
@Target({METHOD, FIELD})
@Retention(RUNTIME)
public @interface CollectionTable {
(Optional) The name of the collection table. If not specified,
it defaults to the concatenation of the name of the containing
entity and the name of the collection attribute, separated by
an underscore.
/**
* (Optional) The name of the collection table. If not specified,
* it defaults to the concatenation of the name of the containing
* entity and the name of the collection attribute, separated by
* an underscore.
*/
String name() default "";
(Optional) The catalog of the table. If not specified, the
default catalog is used.
/**
* (Optional) The catalog of the table. If not specified, the
* default catalog is used.
*/
String catalog() default "";
(Optional) The schema of the table. If not specified, the
default schema for the user is used.
/**
* (Optional) The schema of the table. If not specified, the
* default schema for the user is used.
*/
String schema() default "";
(Optional) The foreign key columns of the collection table
which reference the primary table of the entity. The default
only applies if a single join column is used. The default is
the same as for JoinColumn (i.e., the
concatenation of the following: the name of the entity; "_";
the name of the referenced primary key column.) However, if
there is more than one join column, a JoinColumn
annotation must be specified for each join column using the
JoinColumns annotation. In this case, both the
name and the referencedColumnName
elements must be specified in each such
JoinColumn annotation.
/**
* (Optional) The foreign key columns of the collection table
* which reference the primary table of the entity. The default
* only applies if a single join column is used. The default is
* the same as for <code>JoinColumn</code> (i.e., the
* concatenation of the following: the name of the entity; "_";
* the name of the referenced primary key column.) However, if
* there is more than one join column, a <code>JoinColumn</code>
* annotation must be specified for each join column using the
* <code>JoinColumns</code> annotation. In this case, both the
* <code>name</code> and the <code>referencedColumnName</code>
* elements must be specified in each such
* <code>JoinColumn</code> annotation.
*/
JoinColumn[] joinColumns() default {};
(Optional) Unique constraints that are to be placed on the
table. These are only used if table generation is in effect.
/**
* (Optional) Unique constraints that are to be placed on the
* table. These are only used if table generation is in effect.
*/
UniqueConstraint[] uniqueConstraints() default {};
(Optional) Indexes for the table. These are only used if table generation is in effect.
Returns: The indexes
/**
* (Optional) Indexes for the table. These are only used if table generation is in effect.
*
* @return The indexes
*/
Index[] indexes() default {};
(Optional) Used to specify or control the generation of a foreign key constraint for the columns
corresponding to the joinColumns element when table generation is in effect. If both this element
and the foreignKey element of any of the joinColumns elements are specified, the behavior is undefined.
If no foreign key annotation element is specified in either location, the persistence provider's default
foreign key strategy will apply.
Since: Java Persistence 2.1
/**
* (Optional) Used to specify or control the generation of a foreign key constraint for the columns
* corresponding to the joinColumns element when table generation is in effect. If both this element
* and the foreignKey element of any of the joinColumns elements are specified, the behavior is undefined.
* If no foreign key annotation element is specified in either location, the persistence provider's default
* foreign key strategy will apply.
*
* @since Java Persistence 2.1
*/
ForeignKey foreignKey() default @ForeignKey(ConstraintMode.PROVIDER_DEFAULT);
}