Package org.h2.mode

Class ModeFunction

java.lang.Object

org.h2.expression.Expression

org.h2.expression.OperationN

org.h2.expression.function.FunctionN

org.h2.mode.ModeFunction

All Implemented Interfaces:

ExpressionWithVariableParameters, NamedExpression, HasSQL, Typed

Direct Known Subclasses:

FunctionsDB2Derby, FunctionsLegacy, FunctionsMSSQLServer, FunctionsMySQL, FunctionsOracle, FunctionsPostgreSQL

public abstract class ModeFunction
extends FunctionN

Base class for mode-specific functions.

Field Summary

Fields

Modifier and Type	Field	Description
protected final FunctionInfo	info	The information about this function.
protected static final int	VAR_ARGS	Constant for variable number of arguments.

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

Method Summary

Modifier and Type	Method	Description
void	doneWithParameters()	This method must be called after all the parameters have been set.
static Expression	getCompatibilityDateTimeValueFunction(Database database, String name, int scale)	Get an instance of the given function without parentheses for this database.
static ModeFunction	getFunction(Database database, String name)	Get an instance of the given function for this database.
String	getName()	Get the name.
boolean	isEverything(ExpressionVisitor visitor)	Check if this expression and all sub-expressions can fulfill a criteria.

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

getUnenclosedSQL, getValue, 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, getTypeIfStaticallyKnown, getWhenSQL, getWhenValue, isConstant, isIdentity, isNullConstant, isValueSet, isWhenConditionOperand, needParentheses, optimize, 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 Details

VAR_ARGS

protected static final int VAR_ARGS

Constant for variable number of arguments.

See Also:

• Constant Field Values

info

protected final FunctionInfo info

The information about this function.

Method Details

getFunction

public static ModeFunction getFunction(Database database,
 String name)

Get an instance of the given function for this database. If no function with this name is found, null is returned.

Parameters:

database - the database

name - the upper case function name

Returns:

the function object or null

getCompatibilityDateTimeValueFunction

public static Expression getCompatibilityDateTimeValueFunction(Database database,
 String name,
 int scale)

Get an instance of the given function without parentheses for this database. If no function with this name is found, null is returned.

Parameters:

database - the database

name - the upper case function name

scale - the scale, or -1

Returns:

the function object or null

doneWithParameters

public void doneWithParameters()

Description copied from interface: ExpressionWithVariableParameters

This method must be called after all the parameters have been set. It checks if the parameter count is correct when required by the implementation.

Specified by:

doneWithParameters in interface ExpressionWithVariableParameters

Overrides:

doneWithParameters in class OperationN

getName

public String getName()

Description copied from interface: NamedExpression

Get the name.

Returns:

the name in uppercase

isEverything

public boolean isEverything(ExpressionVisitor visitor)

Description copied from class: Expression

Check if this expression and all sub-expressions can fulfill a criteria. If any part returns false, the result is false.

Overrides:

isEverything in class OperationN

Parameters:

visitor - the visitor

Returns:

if the criteria can be fulfilled