Package org.h2.expression

Class Parameter

java.lang.Object

org.h2.expression.Expression

org.h2.expression.Operation0

org.h2.expression.Parameter

All Implemented Interfaces:

ParameterInterface, HasSQL, Typed

public final class Parameter
extends Operation0
implements ParameterInterface

A parameter of a prepared statement.

Field Summary

Fields

Modifier and Type	Field	Description
private Column	column
private int	index
private Value	value

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	Description
Parameter(int index)

Method Summary

Modifier and Type	Method	Description
void	checkSet()	Check if the value is set.
int	getCost()	Estimate the cost to process the expression.
int	getIndex()
Expression	getNotIfPossible(SessionLocal session)	If it is possible, return the negated expression.
Value	getParamValue()	Get the value of the parameter if set.
TypeInfo	getType()	Returns the data type.
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.
boolean	isEverything(ExpressionVisitor visitor)	Check if this expression and all sub-expressions can fulfill a criteria.
boolean	isValueSet()	Is the value of a parameter set.
Expression	optimize(SessionLocal session)	Try to optimize the expression.
void	setColumn(Column column)
void	setValue(Value v)
void	setValue(Value v, boolean closeOld)	Set the value of the parameter.

Methods inherited from class org.h2.expression.Operation0

mapColumns, setEvaluatable, updateAggregate

Methods inherited from class org.h2.expression.Expression

addFilterConditions, createIndexConditions, getAlias, getBooleanValue, getColumnName, getColumnNameForView, getEnclosedSQL, getNonAliasExpression, getNullable, getSchemaName, getSQL, getSQL, getSQL, getSQL, getSubexpression, getSubexpressionCount, getTableAlias, getTableName, getWhenSQL, getWhenValue, isConstant, isIdentity, isNullConstant, 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

Methods inherited from interface org.h2.expression.ParameterInterface

getNullable

Field Detail

value

private Value value

column

private Column column

index

private final int index

Constructor Detail

Parameter

public Parameter(int index)

Method Detail

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.

Specified by:

getUnenclosedSQL in class Expression

Parameters:

builder - string builder

sqlFlags - formatting flags

Returns:

the specified string builder

setValue

public void setValue(Value v,
                     boolean closeOld)

Description copied from interface: ParameterInterface

Set the value of the parameter.

Specified by:

setValue in interface ParameterInterface

Parameters:

v - the new value

closeOld - if the old value (if one is set) should be closed

setValue

public void setValue(Value v)

getParamValue

public Value getParamValue()

Description copied from interface: ParameterInterface

Get the value of the parameter if set.

Specified by:

getParamValue in interface ParameterInterface

Returns:

the value or null

getValue

public Value getValue(SessionLocal session)

Description copied from class: Expression

Return the resulting value for the current row.

Specified by:

getValue in class Expression

Parameters:

session - the session

Returns:

the result

getType

public TypeInfo getType()

Description copied from class: Expression

Returns the data type. The data type may be unknown before the optimization phase.

Specified by:

getType in interface ParameterInterface

Specified by:

getType in interface Typed

Specified by:

getType in class Expression

Returns:

the data type

checkSet

public void checkSet()

Description copied from interface: ParameterInterface

Check if the value is set.

Specified by:

checkSet in interface ParameterInterface

optimize

public Expression optimize(SessionLocal session)

Description copied from class: Expression

Try to optimize the expression.

Overrides:

optimize in class Operation0

Parameters:

session - the session

Returns:

the optimized expression

isValueSet

public boolean isValueSet()

Description copied from class: Expression

Is the value of a parameter set.

Specified by:

isValueSet in interface ParameterInterface

Overrides:

isValueSet in class Expression

Returns:

true if set

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.

Specified by:

isEverything in class Expression

Parameters:

visitor - the visitor

Returns:

if the criteria can be fulfilled

getCost

public int getCost()

Description copied from class: Expression

Estimate the cost to process the expression. Used when optimizing the query, to calculate the query plan with the lowest estimated cost.

Specified by:

getCost in class Expression

Returns:

the estimated cost

getNotIfPossible

public Expression getNotIfPossible(SessionLocal session)

Description copied from class: Expression

If it is possible, return the negated expression. This is used to optimize NOT expressions: NOT ID>10 can be converted to ID<=10. Returns null if negating is not possible.

Overrides:

getNotIfPossible in class Expression

Parameters:

session - the session

Returns:

the negated expression, or null

setColumn

public void setColumn(Column column)

getIndex

public int getIndex()