org.datanucleus.store.rdbms.sql.method

Class OptionalOrElseMethod

java.lang.Object

org.datanucleus.store.rdbms.sql.method.AbstractSQLMethod

org.datanucleus.store.rdbms.sql.method.OptionalOrElseMethod

All Implemented Interfaces:

SQLMethod

public class OptionalOrElseMethod
extends AbstractSQLMethod

Method for evaluating {optionalExpr1}.orElse(). Returns a XXXExpression representing "CASE WHEN col IS NOT NULL THEN col ELSE otherVal END".

Field Summary

Fields inherited from class org.datanucleus.store.rdbms.sql.method.AbstractSQLMethod

clr, exprFactory, stmt

Constructor Summary

Constructors

Constructor and Description
OptionalOrElseMethod()

Method Summary

Modifier and Type	Method and Description
SQLExpression	getExpression(SQLExpression expr, List<SQLExpression> args) Return the expression for this SQL function.

Methods inherited from class org.datanucleus.store.rdbms.sql.method.AbstractSQLMethod

getMappingForClass, setStatement

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

OptionalOrElseMethod

public OptionalOrElseMethod()

Method Detail

getExpression

public SQLExpression getExpression(SQLExpression expr,
                                   List<SQLExpression> args)

Description copied from interface: SQLMethod

Return the expression for this SQL function.

Parameters:

expr - The expression that it is invoked on

args - Arguments passed in

Returns:

The SQL expression using the SQL function