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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or .
 */
package org.hibernate.annotations;

import org.hibernate.generator.internal.GeneratedAlwaysGeneration;

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 that a column is defined using a DDL {@code generated always as}
 * clause or equivalent, and that Hibernate should fetch the generated value
 * from the database after each SQL {@code INSERT} or {@code UPDATE}.
 *
 * @see ColumnDefault
 *
 * @since 6.0
 * @author Gavin King
 *
 * @see DialectOverride.GeneratedColumn
 */
@ValueGenerationType( generatedBy = GeneratedAlwaysGeneration.class )
@Target( {FIELD, METHOD} )
@Retention( RUNTIME )
public @interface GeneratedColumn {
	/**
	 * The expression to include in the generated DDL.
	 *
	 * @return the SQL expression that is evaluated to generate the column value.
	 */
	String value();
}