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/*
* 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.
*
* Other licenses:
* -----------------------------------------------------------------------------
* Commercial licenses for this work are available. These replace the above
* ASL 2.0 and offer limited warranties, support, maintenance, and commercial
* database integrations.
*
* For more information, please visit: http://www.jooq.org/licenses
*
*
*
*
*
*
*
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*
*
*
*/
package org.jooq;
import static org.jooq.SQLDialect.MYSQL;
// ...
// ...
// ...
import org.jooq.impl.DSL;
/**
* The type of join
*
* @author Lukas Eder
*/
public enum JoinType {
/**
* INNER JOIN two tables.
*/
@Support
JOIN("join", true),
/**
* CROSS JOIN two tables.
*/
@Support
CROSS_JOIN("cross join", false),
/**
* LEFT OUTER JOIN two tables.
*/
@Support
LEFT_OUTER_JOIN("left outer join", true),
/**
* RIGHT OUTER JOIN two tables.
*/
@Support
RIGHT_OUTER_JOIN("right outer join", true),
/**
* FULL OUTER JOIN two tables.
*/
@Support
FULL_OUTER_JOIN("full outer join", true),
/**
* NATURAL INNER JOIN two tables.
*/
@Support
NATURAL_JOIN("natural join", false),
/**
* NATURAL LEFT OUTER JOIN two tables.
*/
@Support
NATURAL_LEFT_OUTER_JOIN("natural left outer join", false),
/**
* NATURAL RIGHT OUTER JOIN two tables.
*/
@Support
NATURAL_RIGHT_OUTER_JOIN("natural right outer join", false),
/**
* CROSS APPLY two tables.
*/
@Support({})
CROSS_APPLY("cross apply", false),
/**
* OUTER APPLY two tables.
*/
@Support({})
OUTER_APPLY("outer apply", false),
/**
* STRAIGHT_JOIN two tables.
*/
@Support({ MYSQL })
STRAIGHT_JOIN("straight_join", true),
/**
* LEFT SEMI JOIN two tables.
*/
@Support
LEFT_SEMI_JOIN("left semi join", true),
/**
* LEFT ANTI JOIN two tables.
*/
@Support
LEFT_ANTI_JOIN("left anti join", true)
;
private final String sql;
private final Keyword keyword;
private final boolean qualified;
private JoinType(String sql, boolean qualified) {
this.sql = sql;
this.keyword = DSL.keyword(sql);
this.qualified = qualified;
}
public final String toSQL() {
return sql;
}
public final Keyword toKeyword() {
return keyword;
}
/**
* Whether a JOIN operation of this type must be qualified with
* ON or USING.
*/
public final boolean qualified() {
return qualified;
}
}
