org.jooq.impl.CombineOperator Maven / Gradle / Ivy
/**
* Copyright (c) 2009-2014, Data Geekery GmbH (http://www.datageekery.com)
* All rights reserved.
*
* This work is dual-licensed
* - under the Apache Software License 2.0 (the "ASL")
* - under the jOOQ License and Maintenance Agreement (the "jOOQ License")
* =============================================================================
* You may choose which license applies to you:
*
* - If you're using this work with Open Source databases, you may choose
* either ASL or jOOQ License.
* - If you're using this work with at least one commercial database, you must
* choose jOOQ License
*
* For more information, please visit http://www.jooq.org/licenses
*
* Apache Software License 2.0:
* -----------------------------------------------------------------------------
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* jOOQ License and Maintenance Agreement:
* -----------------------------------------------------------------------------
* Data Geekery grants the Customer the non-exclusive, timely limited and
* non-transferable license to install and use the Software under the terms of
* the jOOQ License and Maintenance Agreement.
*
* This library is distributed with a LIMITED WARRANTY. See the jOOQ License
* and Maintenance Agreement for more details: http://www.jooq.org/licensing
*/
package org.jooq.impl;
import org.jooq.SQLDialect;
import org.jooq.Select;
/**
* A combine operator is used to combine result sets of two arbitrary
* {@link Select} queries.
*
* @author Lukas Eder
*/
enum CombineOperator {
/**
* Unite the two {@link Select}'s disallowing duplicate records
*/
UNION("union"),
/**
* Unite the two {@link Select}'s allowing duplicate records
*/
UNION_ALL("union all"),
/**
* Remove all records encountered in the second {@link Select} from the
* first {@link Select}
*/
EXCEPT("except"),
/**
* Retain all records encountered in both {@link Select}'s
*/
INTERSECT("intersect");
private final String sql;
private CombineOperator(String sql) {
this.sql = sql;
}
public String toSQL(SQLDialect dialect) {
/* [pro] xx
xx xxxxx xx xxxxxxx x
xx xxxxxxxxxxxxxxxxx xx xxxxxxxxxxxxxxxxxx x
xxxxxx xxxxxxxx
x
x
xx [/pro] */
return sql;
}
}