org.jooq.QueryPart Maven / Gradle / Ivy
/**
* Copyright (c) 2009-2016, Data Geekery GmbH (http://www.datageekery.com)
* All rights reserved.
*
* 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 java.io.Serializable;
/**
* The common base type for all objects that can be used for query composition.
*
* All QueryPart implementations can be cast to
* {@link QueryPartInternal} in order to access the internal API.
*
* @author Lukas Eder
*/
public interface QueryPart extends Serializable {
/**
* Render a SQL string of this QueryPart
*
* For improved debugging, this renders a SQL string of this
* QueryPart with inlined bind variables. If you wish to gain
* more control over the concrete SQL rendering of this
* QueryPart, use {@link DSLContext#renderContext()} to obtain a
* configurable render context for SQL rendering.
*
* @return A SQL string representation of this QueryPart
*/
@Override
String toString();
/**
* Check whether this QueryPart can be considered equal to
* another QueryPart.
*
* In general, QueryPart equality is defined in terms of
* {@link #toString()} equality. In other words, two query parts are
* considered equal if their rendered SQL (with inlined bind variables) is
* equal. This means that the two query parts do not necessarily have to be
* of the same type.
*
* Some QueryPart implementations may choose to override this
* behaviour for improved performance, as {@link #toString()} is an
* expensive operation, if called many times.
*
* @param object The other QueryPart
* @return Whether the two query parts are equal
*/
@Override
boolean equals(Object object);
/**
* Generate a hash code from this QueryPart.
*
* In general, QueryPart hash codes are the same as the hash
* codes generated from {@link #toString()}. This guarantees consistent
* behaviour with {@link #equals(Object)}
*
* Some QueryPart implementations may choose to override this
* behaviour for improved performance, as {@link #toString()} is an
* expensive operation, if called many times.
*
* @return The QueryPart hash code
*/
@Override
int hashCode();
}