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Java Source Code / Java Documentation » Database DBMS » axion » org.axiondb.functions

Source Cross Reference Class Diagram Java Document (Java Doc)

org.axiondb.functions .BaseFunction

org.axiondb.functions .NullIfFunction

NullIfFunction
public class NullIfFunction extends BaseFunction implements ScalarFunction,FunctionFactory(Code)
	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
public	NullIfFunction()

Method Summary
public Object	evaluate(RowDecorator row)
public DataType	getDataType()
public boolean	isValid()
public ConcreteFunction	makeNewInstance()

Constructor Detail

NullIfFunction
public NullIfFunction()(Code)

Method Detail

evaluate
public Object evaluate(RowDecorator row) throws AxionException(Code)

getDataType
public DataType getDataType()(Code)
	AnyType

isValid
public boolean isValid()(Code)

makeNewInstance
public ConcreteFunction makeNewInstance()(Code)

Methods inherited from org.axiondb.functions.BaseFunction

public void addArgument(Selectable arg)(Code)(Java Doc)
public Selectable getArgument(int i)(Code)(Java Doc)
public int getArgumentCount()(Code)(Java Doc)
abstract public DataType getDataType()(Code)(Java Doc)
abstract public boolean isValid()(Code)(Java Doc)
public void setArgument(int i, Selectable arg)(Code)(Java Doc)
public void setVariableContext(VariableContext context)(Code)(Java Doc)
public String toString()(Code)(Java Doc)

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