http://www.jooq.org/jooq: jOOQ effectively combines complex SQL, typesafety, source code generation, active records, stored procedures, advanced data types, and Java in a fluent, intuitive DSL. 
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package org.jooq;

import org.jooq.impl.DSL;

import org.jetbrains.annotations.NotNull;



The SQL case statement.


This construct can be used to create expressions of the type 
CASE x WHEN 1 THEN 'one'
       WHEN 2 THEN 'two'
       ELSE        'three'
END

 or of the type 
CASE WHEN x < 1  THEN 'one'
     WHEN x >= 2 THEN 'two'
     ELSE            'three'
END

 Instances of Case are created through the DSL.decode() method 
Author:Lukas Eder
/**
 * 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 &lt; 1  THEN 'one'
 *      WHEN x &gt;= 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 
CASE value WHEN 1 THEN 'one'
           WHEN 2 THEN 'two'
           ELSE        'three'
END



Params:
  • value – The value to do the case statement on
Type parameters:
  • <V> – The generic value type parameter
Returns:An intermediary step for case statement construction
/**
     * 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
     */
    @NotNull
    @Support
    <V> CaseValueStep<V> value(V value);

    
This construct can be used to create expressions of the type 
CASE value WHEN 1 THEN 'one'
           WHEN 2 THEN 'two'
           ELSE        'three'
END



Params:
  • value – The value to do the case statement on
Type parameters:
  • <V> – The generic value type parameter
Returns:An intermediary step for case statement construction
/**
     * 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
     */
    @NotNull
    @Support
    <V> CaseValueStep<V> value(Field<V> value);

    
This construct can be used to create expressions of the type 
CASE WHEN x < 1  THEN 'one'
     WHEN x >= 2 THEN 'two'
     ELSE            'three'
END



Params:
  • condition – A condition to check in the case statement
  • result – The result if the condition holds true
Type parameters:
  • <T> – The generic field type parameter
Returns:An intermediary step for case statement construction
/**
     * This construct can be used to create expressions of the type <code><pre>
     * CASE WHEN x &lt; 1  THEN 'one'
     *      WHEN x &gt;= 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
     */
    @NotNull
    @Support
    <T> CaseConditionStep<T> when(Condition condition, T result);

    
This construct can be used to create expressions of the type 
CASE WHEN x < 1  THEN 'one'
     WHEN x >= 2 THEN 'two'
     ELSE            'three'
END



Params:
  • condition – A condition to check in the case statement
  • result – The result if the condition holds true
Type parameters:
  • <T> – The generic field type parameter
Returns:An intermediary step for case statement construction
/**
     * This construct can be used to create expressions of the type <code><pre>
     * CASE WHEN x &lt; 1  THEN 'one'
     *      WHEN x &gt;= 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
     */
    @NotNull
    @Support
    <T> CaseConditionStep<T> when(Condition condition, Field<T> result);

    
This construct can be used to create expressions of the type 
CASE WHEN x < 1  THEN 'one'
     WHEN x >= 2 THEN 'two'
     ELSE            'three'
END



Params:
  • condition – A condition to check in the case statement
  • result – The result if the condition holds true
Type parameters:
  • <T> – The generic field type parameter
Returns:An intermediary step for case statement construction
/**
     * This construct can be used to create expressions of the type <code><pre>
     * CASE WHEN x &lt; 1  THEN 'one'
     *      WHEN x &gt;= 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
     */
    @NotNull
    @Support
    <T> CaseConditionStep<T> when(Condition condition, Select<? extends Record1<T>> result);

    
This construct can be used to create expressions of the type 
CASE WHEN x < 1  THEN 'one'
     WHEN x >= 2 THEN 'two'
     ELSE            'three'
END



Params:
  • condition – A condition to check in the case statement
  • result – The result if the condition holds true
Type parameters:
  • <T> – The generic field type parameter
Returns:An intermediary step for case statement construction
/**
     * This construct can be used to create expressions of the type <code><pre>
     * CASE WHEN x &lt; 1  THEN 'one'
     *      WHEN x &gt;= 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
     */
    @NotNull
    @Support
    <T> CaseConditionStep<T> when(Field<Boolean> condition, T result);

    
This construct can be used to create expressions of the type 
CASE WHEN x < 1  THEN 'one'
     WHEN x >= 2 THEN 'two'
     ELSE            'three'
END



Params:
  • condition – A condition to check in the case statement
  • result – The result if the condition holds true
Type parameters:
  • <T> – The generic field type parameter
Returns:An intermediary step for case statement construction
/**
     * This construct can be used to create expressions of the type <code><pre>
     * CASE WHEN x &lt; 1  THEN 'one'
     *      WHEN x &gt;= 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
     */
    @NotNull
    @Support
    <T> CaseConditionStep<T> when(Field<Boolean> condition, Field<T> result);

    
This construct can be used to create expressions of the type 
CASE WHEN x < 1  THEN 'one'
     WHEN x >= 2 THEN 'two'
     ELSE            'three'
END



Params:
  • condition – A condition to check in the case statement
  • result – The result if the condition holds true
Type parameters:
  • <T> – The generic field type parameter
Returns:An intermediary step for case statement construction
/**
     * This construct can be used to create expressions of the type <code><pre>
     * CASE WHEN x &lt; 1  THEN 'one'
     *      WHEN x &gt;= 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
     */
    @NotNull
    @Support
    <T> CaseConditionStep<T> when(Field<Boolean> condition, Select<? extends Record1<T>> result);
}