org.h2.expression.function

Class NullIfFunction

java.lang.Object

org.h2.expression.Expression

org.h2.expression.Operation2

org.h2.expression.function.Function2

org.h2.expression.function.NullIfFunction

All Implemented Interfaces:

NamedExpression, HasSQL, Typed

public final class NullIfFunction
extends Function2

A NULLIF function.

Field Summary

Fields inherited from class org.h2.expression.Operation2

left, right, type

Fields inherited from class org.h2.expression.Expression

AUTO_PARENTHESES, MAP_IN_AGGREGATE, MAP_IN_WINDOW, MAP_INITIAL, WITH_PARENTHESES, WITHOUT_PARENTHESES

Fields inherited from interface org.h2.util.HasSQL

ADD_PLAN_INFORMATION, DEFAULT_SQL_FLAGS, NO_CASTS, QUOTE_ONLY_WHEN_REQUIRED, REPLACE_LOBS_FOR_TRACE, TRACE_SQL_FLAGS

Constructor Summary

Constructors

Constructor and Description
NullIfFunction(Expression arg1, Expression arg2)

Method Summary

Modifier and Type	Method and Description
java.lang.String	getName() Get the name.
Value	getValue(SessionLocal session) Return the resulting value for the current row.
Expression	optimize(SessionLocal session) Try to optimize the expression.

Methods inherited from class org.h2.expression.function.Function2

getUnenclosedSQL, getValue

Methods inherited from class org.h2.expression.Operation2

getCost, getSubexpression, getSubexpressionCount, getType, isEverything, mapColumns, setEvaluatable, updateAggregate

Methods inherited from class org.h2.expression.Expression

addFilterConditions, createIndexConditions, getAlias, getBooleanValue, getColumnName, getColumnNameForView, getEnclosedSQL, getNonAliasExpression, getNotIfPossible, getNullable, getSchemaName, getSQL, getSQL, getSQL, getSQL, getTableAlias, getTableName, getWhenSQL, getWhenValue, isConstant, isIdentity, isNullConstant, isValueSet, isWhenConditionOperand, needParentheses, optimizeCondition, toString, writeExpressions, writeExpressions

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.h2.util.HasSQL

getTraceSQL

Constructor Detail

NullIfFunction

public NullIfFunction(Expression arg1,
                      Expression arg2)

Method Detail

getValue

public Value getValue(SessionLocal session)

Description copied from class: Expression

Return the resulting value for the current row.

Overrides:

getValue in class Function2

Parameters:

session - the session

Returns:

the result

optimize

public Expression optimize(SessionLocal session)

Description copied from class: Expression

Try to optimize the expression.

Specified by:

optimize in class Expression

Parameters:

session - the session

Returns:

the optimized expression

getName

public java.lang.String getName()

Description copied from interface: NamedExpression

Get the name.

Returns:

the name in uppercase