openjpa-jdbc/src/main/java/org/apache/openjpa/jdbc/sql/JoinSyntaxes.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
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 */
package org.apache.openjpa.jdbc.sql;

/**
 * Constants for ways of describing joins in SQL.
 *
 * @author Abe White
 */
public interface JoinSyntaxes {

    /**
     * ANSI SQL 92 join syntax; outer joins are supported.
     */
    int SYNTAX_SQL92 = 0;

    /**
     * Traditional join syntax; outer joins are not supported.
     */
    int SYNTAX_TRADITIONAL = 1;

    /**
     * Native database join syntax; outer joins are supported.
     */
    int SYNTAX_DATABASE = 2;
}