org.axiondb.functions

Class NullIfFunction

public class NullIfFunction extends BaseFunction implements ScalarFunction, FunctionFactory

The NULLIF function returns a null value if the arguments are equal, otherwise it returns the value of the first argument.

The result of using NULLIF(e1,e2) is the same as using the expression CASE WHEN e1=e2 THEN NULL ELSE e1 END

Version: $Revision: 1.5 $ $Date: 2005/12/20 18:32:28 $

Author: Ahimanikya Satapathy

Constructor Summary
	NullIfFunction()

Constructor Detail

public NullIfFunction()

public Object evaluate(RowDecorator row)

public DataType getDataType()

public boolean isValid()

public ConcreteFunction makeNewInstance()