org.datanucleus.store.rdbms.sql.method

Class NullIfFunction

java.lang.Object

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

org.datanucleus.store.rdbms.sql.method.NullIfFunction

All Implemented Interfaces:

SQLMethod

public class NullIfFunction
extends AbstractSQLMethod

Expression handler to invoke the SQL NULLIF function. For use in evaluating NULLIF({expr [,expr2[,expr3]]}) where the RDBMS supports this function. Returns a NumericExpression "NULLIF({numericExpr})".

Field Summary

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

clr, exprFactory, stmt

Constructor Summary

Constructors

Constructor and Description
NullIfFunction()

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

NullIfFunction

public NullIfFunction()

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