/*
 * 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.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
  Long id;

See Also:
Column
GeneratedValue
Since:
Java Persistence 1.0/**
 * Specifies the primary key of an entity.
 * The field or property to which the <code>Id</code> annotation is applied
 * should be one of the following types: any Java primitive type;
 * any primitive wrapper type;
 * <code>String</code>;
 * <code>java.util.Date</code>;
 * <code>java.sql.Date</code>;
 * <code>java.math.BigDecimal</code>;
 * <code>java.math.BigInteger</code>.
 * <p>
 * <p>The mapped column for the primary key of the entity is assumed
 * to be the primary key of the primary table. If no <code>Column</code> annotation
 * is specified, the primary key column name is assumed to be the name
 * of the primary key property or field.
 * <p>
 * <pre>
 *   Example:
 *
 *   &#064;Id
 *   Long id;
 * </pre>
 *
 * @see Column
 * @see GeneratedValue
 * @since Java Persistence 1.0
 */
@Target({FIELD})
@Retention(RUNTIME)

public @interface Id {
}