javax.persistence.SecondaryTable Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2008 - 2013 Oracle Corporation. 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.
*
* Contributors:
* Linda DeMichiel - Java Persistence 2.1
* Linda DeMichiel - Java Persistence 2.0
*
******************************************************************************/
package javax.persistence;
import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import static javax.persistence.ConstraintMode.PROVIDER_DEFAULT;
/**
* Specifies a secondary table for the annotated entity
* class. Specifying one or more secondary tables indicates that the
* data for the entity class is stored across multiple tables.
*
* If no SecondaryTable annotation is specified,
* it is assumed that all persistent fields or properties of the
* entity are mapped to the primary table. If no primary key join
* columns are specified, the join columns are assumed to reference
* the primary key columns of the primary table, and have the same
* names and types as the referenced primary key columns of the
* primary table.
*
*
* Example 1: Single secondary table with a single primary key column.
*
* @Entity
* @Table(name="CUSTOMER")
* @SecondaryTable(name="CUST_DETAIL",
* pkJoinColumns=@PrimaryKeyJoinColumn(name="CUST_ID"))
* public class Customer { ... }
*
*
* Example 2: Single secondary table with multiple primary key columns.
*
* @Entity
* @Table(name="CUSTOMER")
* @SecondaryTable(name="CUST_DETAIL",
* pkJoinColumns={
* @PrimaryKeyJoinColumn(name="CUST_ID"),
* @PrimaryKeyJoinColumn(name="CUST_TYPE")})
* public class Customer { ... }
*
*
* @since Java Persistence 1.0
*/
@Target(TYPE)
@Retention(RUNTIME)
public @interface SecondaryTable {
/** (Required) The name of the table. */
String name();
/** (Optional) The catalog of the table.
* Defaults to the default catalog.
*/
String catalog() default "";
/** (Optional) The schema of the table.
*
Defaults to the default schema for user.
*/
String schema() default "";
/**
* (Optional) The columns that are used to join with
* the primary table.
*
Defaults to the column(s) of the same name(s)
* as the primary key column(s) in the primary table.
*/
PrimaryKeyJoinColumn[] pkJoinColumns() default {};
/**
* (Optional) Used to specify or control the generation of a
* foreign key constraint for the columns corresponding to the
* pkJoinColumns element when table generation is
* in effect. If both this element and the
* foreignKey element of any of the
* pkJoinColumns 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(PROVIDER_DEFAULT);
/**
* (Optional) Unique constraints that are to be placed on the
* table. These are typically only used if table generation
* is in effect. These constraints apply in addition to any
* constraints specified by the Column and JoinColumn
* annotations and constraints entailed by primary key mappings.
*
Defaults to no additional constraints.
*/
UniqueConstraint[] uniqueConstraints() default {};
/**
* (Optional) Indexes for the table. These are only used if
* table generation is in effect.
*
* @since Java Persistence 2.1
*/
Index[] indexes() default {};
}