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 java.util.HashMap<java.lang.String,FunctionInfo>`	`FUNCTIONS`
`private static int`	`IDENTITY_VAL_LOCAL`
`private static TypeInfo`	`IDENTITY_VAL_LOCAL_TYPE`

Fields inherited from class org.h2.mode.ModeFunction
info, VAR_ARGS

Fields inherited from class org.h2.expression.OperationN
args, argsCount, 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
Modifier Constructor Description

private FunctionsDB2Derby(FunctionInfo info)

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static FunctionsDB2Derby`	`getFunction(java.lang.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 org.h2.mode.ModeFunction
checkParameterCount, doneWithParameters, getArgumentsValues, getFunction, getName, getNullOrValue, isEverything, optimizeArguments

Methods inherited from class org.h2.expression.function.FunctionN
getUnenclosedSQL, getValue

Methods inherited from class org.h2.expression.OperationN
addParameter, getCost, getSubexpression, getSubexpressionCount, getType, mapColumns, optimizeArguments, 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

- Field Detail
  - IDENTITY_VAL_LOCAL
```
private static final int IDENTITY_VAL_LOCAL
```
    See Also:
    
    Constant Field Values
  - FUNCTIONS
```
private static final java.util.HashMap<java.lang.String,FunctionInfo> FUNCTIONS
```
  - IDENTITY_VAL_LOCAL_TYPE
```
private static final TypeInfo IDENTITY_VAL_LOCAL_TYPE
```
- Constructor Detail
  - FunctionsDB2Derby
```
private FunctionsDB2Derby(FunctionInfo info)
```
- Method Detail
  - getFunction
```
public static FunctionsDB2Derby getFunction(java.lang.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