jakarta.persistence.SecondaryTable Maven / Gradle / Ivy
/*
* Copyright (c) 2008, 2023 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
// Contributors:
// Petros Splinakis - 2.2
// Linda DeMichiel - 2.1
// Linda DeMichiel - 2.0
package jakarta.persistence;
import java.lang.annotation.Repeatable;
import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
/**
* 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 {@code 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.
* {@snippet :
* @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.
* {@snippet :
* @Entity
* @Table(name = "CUSTOMER")
* @SecondaryTable(name = "CUST_DETAIL",
* pkJoinColumns = {
* @PrimaryKeyJoinColumn(name = "CUST_ID"),
* @PrimaryKeyJoinColumn(name = "CUST_TYPE")})
* public class Customer { ... }
* }
*
* @since 1.0
*/
@Repeatable(SecondaryTables.class)
@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
* {@link #pkJoinColumns} element when table generation is in
* effect. If both this element and the {@code #foreignKey}
* element of any of the {@link #pkJoinColumns} elements are
* specified, the behavior is undefined. If no foreign key
* annotation element is specified in either location, a default
* foreign key strategy is selected by the persistence provider.
*
* @since 2.1
*/
ForeignKey foreignKey() default @ForeignKey(ConstraintMode.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 {@link Column} and {@link 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 2.1
*/
Index[] indexes() default {};
/**
* (Optional) Check constraints to be applied to the table.
* These are only used if table generation is in effect.
*
* @since 3.2
*/
CheckConstraint[] check() default {};
/**
* (Optional) A comment to be applied to the table.
* This is only used if table generation is in effect.
*
* @since 3.2
*/
String comment() default "";
/**
* (Optional) A SQL fragment appended to the generated DDL
* statement which creates this table. This is only used if
* table generation is in effect.
*
* @since 3.2
*/
String options() default "";
}