/*
* 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
*
*
*
*
*
*
*
*
*
*
*
*
*
*/
package org.jooq;
import org.jooq.impl.DSL;
/**
* The SQL case statement.
* <p>
* This construct can be used to create expressions of the type <code><pre>
* CASE x WHEN 1 THEN 'one'
* WHEN 2 THEN 'two'
* ELSE 'three'
* END
* </pre></code> or of the type <code><pre>
* CASE WHEN x < 1 THEN 'one'
* WHEN x >= 2 THEN 'two'
* ELSE 'three'
* END
* </pre></code> Instances of Case are created through the
* {@link DSL#decode()} method
*
* @author Lukas Eder
*/
public interface Case {
/**
* This construct can be used to create expressions of the type <code><pre>
* CASE value WHEN 1 THEN 'one'
* WHEN 2 THEN 'two'
* ELSE 'three'
* END
* </pre></code>
*
* @param <V> The generic value type parameter
* @param value The value to do the case statement on
* @return An intermediary step for case statement construction
*/
@Support
<V> CaseValueStep<V> value(V value);
/**
* This construct can be used to create expressions of the type <code><pre>
* CASE value WHEN 1 THEN 'one'
* WHEN 2 THEN 'two'
* ELSE 'three'
* END
* </pre></code>
*
* @param <V> The generic value type parameter
* @param value The value to do the case statement on
* @return An intermediary step for case statement construction
*/
@Support
<V> CaseValueStep<V> value(Field<V> value);
/**
* This construct can be used to create expressions of the type <code><pre>
* CASE WHEN x < 1 THEN 'one'
* WHEN x >= 2 THEN 'two'
* ELSE 'three'
* END
* </pre></code>
*
* @param <T> The generic field type parameter
* @param condition A condition to check in the case statement
* @param result The result if the condition holds true
* @return An intermediary step for case statement construction
*/
@Support
<T> CaseConditionStep<T> when(Condition condition, T result);
/**
* This construct can be used to create expressions of the type <code><pre>
* CASE WHEN x < 1 THEN 'one'
* WHEN x >= 2 THEN 'two'
* ELSE 'three'
* END
* </pre></code>
*
* @param <T> The generic field type parameter
* @param condition A condition to check in the case statement
* @param result The result if the condition holds true
* @return An intermediary step for case statement construction
*/
@Support
<T> CaseConditionStep<T> when(Condition condition, Field<T> result);
/**
* This construct can be used to create expressions of the type <code><pre>
* CASE WHEN x < 1 THEN 'one'
* WHEN x >= 2 THEN 'two'
* ELSE 'three'
* END
* </pre></code>
*
* @param <T> The generic field type parameter
* @param condition A condition to check in the case statement
* @param result The result if the condition holds true
* @return An intermediary step for case statement construction
*/
@Support
<T> CaseConditionStep<T> when(Condition condition, Select<? extends Record1<T>> result);
}