javax.persistence.Id 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.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
/**
* Specifies the primary key of an entity.
* The field or property to which the Id annotation is applied
* should be one of the following types: any Java primitive type;
* any primitive wrapper type;
* String;
* java.util.Date;
* java.sql.Date;
* java.math.BigDecimal;
* java.math.BigInteger.
*
* The mapped column for the primary key of the entity is assumed
* to be the primary key of the primary table. If no Column annotation
* is specified, the primary key column name is assumed to be the name
* of the primary key property or field.
*
*
* Example:
*
* @Id
* public Long getId() { return id; }
*
*
* @see Column
* @see GeneratedValue
*
* @since Java Persistence 1.0
*/
@Target({METHOD, FIELD})
@Retention(RUNTIME)
public @interface Id {}