Package org.hibernate.tool.hbm2ddl

Enum UniqueConstraintSchemaUpdateStrategy

java.lang.Object

java.lang.Enum<UniqueConstraintSchemaUpdateStrategy>

org.hibernate.tool.hbm2ddl.UniqueConstraintSchemaUpdateStrategy

All Implemented Interfaces:

Serializable, Comparable<UniqueConstraintSchemaUpdateStrategy>

public enum UniqueConstraintSchemaUpdateStrategy
extends Enum<UniqueConstraintSchemaUpdateStrategy>

Unique columns and unique keys both use unique constraints in most dialects. SchemaUpdate needs to create these constraints, but DB's support for finding existing constraints is extremely inconsistent. Further, non-explicitly-named unique constraints use randomly generated characters.

Enum Constant Summary

Enum Constants

Enum Constant	Description
DROP_RECREATE_QUIETLY	Attempt to drop, then (re-)create each unique constraint.
RECREATE_QUIETLY	Attempt to (re-)create unique constraints, ignoring exceptions thrown (e.g., if the constraint already existed)
SKIP	Do not attempt to create unique constraints on a schema update

Method Summary

Modifier and Type	Method	Description
static UniqueConstraintSchemaUpdateStrategy	byName(String name)
static UniqueConstraintSchemaUpdateStrategy	interpret(Object setting)
static UniqueConstraintSchemaUpdateStrategy	valueOf(String name)	Returns the enum constant of this type with the specified name.
static UniqueConstraintSchemaUpdateStrategy[]	values()	Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

DROP_RECREATE_QUIETLY

public static final UniqueConstraintSchemaUpdateStrategy DROP_RECREATE_QUIETLY

Attempt to drop, then (re-)create each unique constraint. Ignore any exceptions thrown. Note that this will require unique keys/constraints to be explicitly named. If Hibernate generates the names (randomly), the drop will not work. DEFAULT

RECREATE_QUIETLY

public static final UniqueConstraintSchemaUpdateStrategy RECREATE_QUIETLY

Attempt to (re-)create unique constraints, ignoring exceptions thrown (e.g., if the constraint already existed)

SKIP

public static final UniqueConstraintSchemaUpdateStrategy SKIP

Do not attempt to create unique constraints on a schema update

Method Detail

values

public static UniqueConstraintSchemaUpdateStrategy[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (UniqueConstraintSchemaUpdateStrategy c : UniqueConstraintSchemaUpdateStrategy.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static UniqueConstraintSchemaUpdateStrategy valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

byName

public static UniqueConstraintSchemaUpdateStrategy byName(String name)

interpret

public static UniqueConstraintSchemaUpdateStrategy interpret(Object setting)