Package org.datanucleus.store.rdbms.sql.method

Class NullIfFunction

java.lang.Object

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

All Implemented Interfaces:

SQLMethod

public class NullIfFunction
extends Object
implements SQLMethod

Expression handler to invoke the SQL NULLIF function. For use in evaluating NULLIF({expr [,expr2[,expr3]]}) where the RDBMS supports this function. All args must be of consistent expression types. Returns an SQLExpression "NULLIF({expr})".

Constructor Summary

Constructors

Constructor	Description
NullIfFunction()

Method Summary

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

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(SQLStatement stmt,
                                   SQLExpression expr,
                                   List<SQLExpression> args)

Description copied from interface: SQLMethod

Return the expression for this SQL function.

Specified by:

getExpression in interface SQLMethod

Parameters:

stmt - SQLStatement that this expression is for

expr - The expression that it is invoked on

args - Arguments passed in

Returns:

The SQL expression using the SQL function