Class FunctionsDB2Derby

java.lang.Object

org.h2.expression.Expression

org.h2.expression.OperationN

org.h2.expression.function.FunctionN

org.h2.mode.ModeFunction

org.h2.mode.FunctionsDB2Derby

All Implemented Interfaces:

ExpressionWithVariableParameters, NamedExpression, HasSQL, Typed

public final class FunctionsDB2Derby
extends ModeFunction

Functions for Mode.ModeEnum.DB2 and Mode.ModeEnum.Derby compatibility modes.

Field Summary

Fields

Modifier and Type	Field	Description
private static final HashMap<String, FunctionInfo>	FUNCTIONS
private static final int	IDENTITY_VAL_LOCAL
private static final TypeInfo	IDENTITY_VAL_LOCAL_TYPE

Fields inherited from class ModeFunction

info, VAR_ARGS

Fields inherited from class OperationN

args, argsCount, type

Fields inherited from class Expression

AUTO_PARENTHESES, MAP_IN_AGGREGATE, MAP_IN_WINDOW, MAP_INITIAL, WITH_PARENTHESES, WITHOUT_PARENTHESES

Fields inherited from interface HasSQL

ADD_PLAN_INFORMATION, DEFAULT_SQL_FLAGS, NO_CASTS, QUOTE_ONLY_WHEN_REQUIRED, REPLACE_LOBS_FOR_TRACE, TRACE_SQL_FLAGS

Constructor Summary

Constructors

Modifier	Constructor	Description
private	FunctionsDB2Derby(FunctionInfo info)

Method Summary

Modifier and Type	Method	Description
static FunctionsDB2Derby	getFunction(String upperName)	Returns mode-specific function for a given name, or null.
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 ModeFunction

checkParameterCount, doneWithParameters, getArgumentsValues, getFunction, getName, getNullOrValue, isEverything, optimizeArguments

Methods inherited from class FunctionN

getUnenclosedSQL, getValue

Methods inherited from class OperationN

addParameter, getCost, getSubexpression, getSubexpressionCount, getType, mapColumns, optimizeArguments, setEvaluatable, updateAggregate

Methods inherited from class 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 Object

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

Methods inherited from interface HasSQL

getTraceSQL

Field Details

IDENTITY_VAL_LOCAL

private static final int IDENTITY_VAL_LOCAL

See Also:

• Constant Field Values

FUNCTIONS

private static final HashMap<String, FunctionInfo> FUNCTIONS

IDENTITY_VAL_LOCAL_TYPE

private static final TypeInfo IDENTITY_VAL_LOCAL_TYPE

Constructor Details

FunctionsDB2Derby

private FunctionsDB2Derby(FunctionInfo info)

Method Details

getFunction

public static FunctionsDB2Derby getFunction(String upperName)

Returns mode-specific function for a given name, or null.

Parameters:

upperName - the upper-case name of a function

Returns:

the function with specified name or null

getValue

public Value getValue(SessionLocal session)

Description copied from class: Expression

Return the resulting value for the current row.

Overrides:

getValue in class FunctionN

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