package io.ebean.annotation;

Modes for the DbForeignKey onDelete and onUpdate clause of a foreign keys.

Note that we should never change the onUpdate clause as primary keys
should never change. Instead review the design ensuring the primary keys are immutable.
Always leave the onUpdate mode at it's default of RESTRICT ('No Action').

See Also:
DbForeignKey/**
 * Modes for the DbForeignKey onDelete and onUpdate clause of a foreign keys.
 * <p>
 * Note that we should never change the <code>onUpdate</code> clause as primary keys
 * should never change. Instead review the design ensuring the primary keys are immutable.
 * Always leave the onUpdate mode at it's default of RESTRICT ('No Action').
 * </p>
 *
 * @see DbForeignKey
 */
public enum ConstraintMode {

	
Restrict - The usual default behavior for foreign constraints (also known as 'No Action').
/**
	 * Restrict - The usual default behavior for foreign constraints (also known as 'No Action').
	 */
	RESTRICT,

	
Set the value to null when a referenced id is deleted.
/**
	 * Set the value to null when a referenced id is deleted.
	 */
	SET_NULL,

	
Set the value to 'default' when a referenced id is deleted.
/**
	 * Set the value to 'default' when a referenced id is deleted.
	 */
	SET_DEFAULT,

	
Cascade - To automatically cascade a delete of a referenced id.
/**
	 * Cascade - To automatically cascade a delete of a referenced id.
	 */
	CASCADE

}