org.h2.expression.function

Class CoalesceFunction

java.lang.Object

org.h2.expression.Expression

org.h2.expression.OperationN

org.h2.expression.function.FunctionN

org.h2.expression.function.CoalesceFunction

All Implemented Interfaces:

ExpressionWithVariableParameters, NamedExpression, HasSQL, Typed

public final class CoalesceFunction
extends FunctionN

A COALESCE, GREATEST, or LEAST function.

Field Summary

Fields

Modifier and Type	Field and Description
static int	COALESCE COALESCE().
static int	GREATEST GREATEST() (non-standard).
static int	LEAST LEAST() (non-standard).

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

Constructor and Description
CoalesceFunction(int function)
CoalesceFunction(int function, Expression... args)

Method Summary

Modifier and Type	Method and Description
java.lang.String	getName() Get the name.
java.lang.StringBuilder	getUnenclosedSQL(java.lang.StringBuilder builder, int sqlFlags) Get the SQL statement of this expression.
Value	getValue(SessionLocal session) Return the resulting value for the current row.
Expression	optimize(SessionLocal session) Try to optimize the expression.
void	setIgnoreNulls(boolean ignoreNulls)

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

getValue

Methods inherited from class org.h2.expression.OperationN

addParameter, doneWithParameters, getCost, getSubexpression, getSubexpressionCount, getType, isEverything, 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

COALESCE

public static final int COALESCE

COALESCE().

See Also:

Constant Field Values

GREATEST

public static final int GREATEST

GREATEST() (non-standard).

See Also:

Constant Field Values

LEAST

public static final int LEAST

LEAST() (non-standard).

See Also:

Constant Field Values

Constructor Detail

CoalesceFunction

public CoalesceFunction(int function)

CoalesceFunction

public CoalesceFunction(int function,
                        Expression... args)

Method Detail

setIgnoreNulls

public void setIgnoreNulls(boolean ignoreNulls)

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

getName

public java.lang.String getName()

Description copied from interface: NamedExpression

Get the name.

Returns:

the name in uppercase

getUnenclosedSQL

public java.lang.StringBuilder getUnenclosedSQL(java.lang.StringBuilder builder,
                                                int sqlFlags)

Description copied from class: Expression

Get the SQL statement of this expression. This may not always be the original SQL statement, especially after optimization. Enclosing '(' and ')' are never appended.

Overrides:

getUnenclosedSQL in class FunctionN

Parameters:

builder - string builder

sqlFlags - formatting flags

Returns:

the specified string builder