程序包 org.hibernate.dialect.unique

类 DefaultUniqueDelegate

java.lang.Object

org.hibernate.dialect.unique.DefaultUniqueDelegate

所有已实现的接口:

UniqueDelegate

直接已知子类:

DB2UniqueDelegate, InformixUniqueDelegate, MySQLUniqueDelegate

public class DefaultUniqueDelegate
extends Object
implements UniqueDelegate

The default UniqueDelegate implementation for most dialects. Uses separate create/alter statements to apply uniqueness to a column.

作者:

Brett Meyer

字段概要

字段

修饰符和类型	字段	说明
protected Dialect	dialect

构造器概要

构造器

构造器	说明
DefaultUniqueDelegate(Dialect dialect)	Constructs DefaultUniqueDelegate

方法概要

修饰符和类型	方法	说明
String	getAlterTableToAddUniqueKeyCommand(UniqueKey uniqueKey, Metadata metadata)	Get the SQL ALTER TABLE command to be used to create the given UniqueKey.
String	getAlterTableToDropUniqueKeyCommand(UniqueKey uniqueKey, Metadata metadata)	Get the SQL ALTER TABLE command to be used to drop the given UniqueKey.
String	getColumnDefinitionUniquenessFragment(Column column)	Get the fragment that can be used to make a column unique as part of its column definition.
protected String	getDropUnique()
String	getTableCreationUniqueConstraintsFragment(Table table)	Get the fragment that can be used to apply unique constraints as part of table creation.
protected String	uniqueConstraintSql(UniqueKey uniqueKey)

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

字段详细资料

dialect

protected final Dialect dialect

构造器详细资料

DefaultUniqueDelegate

public DefaultUniqueDelegate(Dialect dialect)

Constructs DefaultUniqueDelegate

参数:

dialect - The dialect for which we are handling unique constraints

方法详细资料

getColumnDefinitionUniquenessFragment

public String getColumnDefinitionUniquenessFragment(Column column)

从接口复制的说明: UniqueDelegate

Get the fragment that can be used to make a column unique as part of its column definition.

This is intended for dialects which do not support unique constraints

指定者:

getColumnDefinitionUniquenessFragment 在接口中 UniqueDelegate

参数:

column - The column to which to apply the unique

返回:

The fragment (usually "unique"), empty string indicates the uniqueness will be indicated using a different approach

getTableCreationUniqueConstraintsFragment

public String getTableCreationUniqueConstraintsFragment(Table table)

从接口复制的说明: UniqueDelegate

Get the fragment that can be used to apply unique constraints as part of table creation. The implementation should iterate over the UniqueKey instances for the given table (see Table.getUniqueKeyIterator() and generate the whole fragment for all unique keys

Intended for Dialects which support unique constraint definitions, but just not in separate ALTER statements.

指定者:

getTableCreationUniqueConstraintsFragment 在接口中 UniqueDelegate

参数:

table - The table for which to generate the unique constraints fragment

返回:

The fragment, typically in the form ", unique(col1, col2), unique( col20)". NOTE: The leading comma is important!

getAlterTableToAddUniqueKeyCommand

public String getAlterTableToAddUniqueKeyCommand(UniqueKey uniqueKey,
                                                 Metadata metadata)

从接口复制的说明: UniqueDelegate

Get the SQL ALTER TABLE command to be used to create the given UniqueKey.

指定者:

getAlterTableToAddUniqueKeyCommand 在接口中 UniqueDelegate

参数:

uniqueKey - The UniqueKey instance. Contains all information about the columns

metadata - Access to the bootstrap mapping information

返回:

The ALTER TABLE command

uniqueConstraintSql

protected String uniqueConstraintSql(UniqueKey uniqueKey)

getAlterTableToDropUniqueKeyCommand

public String getAlterTableToDropUniqueKeyCommand(UniqueKey uniqueKey,
                                                  Metadata metadata)

从接口复制的说明: UniqueDelegate

Get the SQL ALTER TABLE command to be used to drop the given UniqueKey.

指定者:

getAlterTableToDropUniqueKeyCommand 在接口中 UniqueDelegate

参数:

uniqueKey - The UniqueKey instance. Contains all information about the columns

metadata - Access to the bootstrap mapping information

返回:

The ALTER TABLE command

getDropUnique

protected String getDropUnique()