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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* JBoss, Home of Professional Open Source
* Copyright 2012 Red Hat Inc. and/or its affiliates and other contributors
* as indicated by the @authors tag. All rights reserved.
* See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License, v. 2.1.
* This program is distributed in the hope that it will be useful, but WITHOUT A
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public License,
* v.2.1 along with this distribution; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
package org.hibernate.dialect.unique;
import org.hibernate.metamodel.relational.Column;
import org.hibernate.metamodel.relational.Table;
import org.hibernate.metamodel.relational.UniqueKey;
/**
* Dialect-level delegate in charge of applying "uniqueness" to a column. Uniqueness can be defined
* in 1 of 3 ways:
*
* Add a unique constraint via separate alter table statements. See {@link #getAlterTableToAddUniqueKeyCommand}.
* Also, see {@link #getAlterTableToDropUniqueKeyCommand}
*
*
* Add a unique constraint via dialect-specific syntax in table create statement. See
* {@link #getTableCreationUniqueConstraintsFragment}
*
*
* Add "unique" syntax to the column itself. See {@link #getColumnDefinitionUniquenessFragment}
*
*
*
* #1 & #2 are preferred, if possible; #3 should be solely a fall-back.
*
* See HHH-7797.
*
* @author Brett Meyer
*/
public interface 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
*
* @param column The column to which to apply the unique
*
* @return The fragment (usually "unique"), empty string indicates the uniqueness will be indicated using a
* different approach
*/
public String getColumnDefinitionUniquenessFragment(org.hibernate.mapping.Column column);
/**
* 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
*
* @param column The column to which to apply the unique
*
* @return The fragment (usually "unique"), empty string indicates the uniqueness will be indicated using a
* different approach
*/
public String getColumnDefinitionUniquenessFragment(Column column);
/**
* Get the fragment that can be used to apply unique constraints as part of table creation. The implementation
* should iterate over the {@link org.hibernate.mapping.UniqueKey} instances for the given table (see
* {@link org.hibernate.mapping.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.
*
* @param table The table for which to generate the unique constraints fragment
*
* @return The fragment, typically in the form {@code ", unique(col1, col2), unique( col20)"}. NOTE: The leading
* comma is important!
*/
public String getTableCreationUniqueConstraintsFragment(org.hibernate.mapping.Table table);
/**
* Get the fragment that can be used to apply unique constraints as part of table creation. The implementation
* should iterate over the {@link org.hibernate.mapping.UniqueKey} instances for the given table (see
* {@link org.hibernate.mapping.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.
*
* @param table The table for which to generate the unique constraints fragment
*
* @return The fragment, typically in the form {@code ", unique(col1, col2), unique( col20)"}. NOTE: The leading
* comma is important!
*/
public String getTableCreationUniqueConstraintsFragment(Table table);
/**
* Get the SQL ALTER TABLE command to be used to create the given UniqueKey.
*
* @param uniqueKey The UniqueKey instance. Contains all information about the columns
* @param defaultCatalog The default catalog
* @param defaultSchema The default schema
*
* @return The ALTER TABLE command
*/
public String getAlterTableToAddUniqueKeyCommand(
org.hibernate.mapping.UniqueKey uniqueKey,
String defaultCatalog,
String defaultSchema);
/**
* Get the SQL ALTER TABLE command to be used to create the given UniqueKey.
*
* @param uniqueKey The UniqueKey instance. Contains all information about the columns, as well as
* schema/catalog
*
* @return The ALTER TABLE command
*/
public String getAlterTableToAddUniqueKeyCommand(UniqueKey uniqueKey);
/**
* Get the SQL ALTER TABLE command to be used to drop the given UniqueKey.
*
* @param uniqueKey The UniqueKey instance. Contains all information about the columns
* @param defaultCatalog The default catalog
* @param defaultSchema The default schema
*
* @return The ALTER TABLE command
*/
public String getAlterTableToDropUniqueKeyCommand(
org.hibernate.mapping.UniqueKey uniqueKey,
String defaultCatalog, String defaultSchema);
/**
* Get the SQL ALTER TABLE command to be used to drop the given UniqueKey.
*
* @param uniqueKey The UniqueKey instance. Contains all information about the columns, as well as
* schema/catalog
*
* @return The ALTER TABLE command
*/
public String getAlterTableToDropUniqueKeyCommand(UniqueKey uniqueKey);
}
