Package org.h2.expression.function

Class CastSpecification

java.lang.Object

org.h2.expression.Expression

org.h2.expression.Operation1_2

org.h2.expression.function.Function1_2

org.h2.expression.function.CastSpecification

All Implemented Interfaces:

NamedExpression, HasSQL, Typed

public final class CastSpecification
extends Function1_2

A cast specification.

Field Summary

Fields inherited from class org.h2.expression.Operation1_2

left, right, 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	Description
CastSpecification(Expression arg, Column column)
CastSpecification(Expression arg, Column column, Expression template)
CastSpecification(Expression arg, TypeInfo type)

Method Summary

Modifier and Type	Method	Description
String	getName()	Get the name.
TypeInfo	getTypeIfStaticallyKnown(SessionLocal session)	Returns data type of this expression if it is statically known.
StringBuilder	getUnenclosedSQL(StringBuilder builder, int sqlFlags)	Get the SQL statement of this expression.
protected Value	getValue(SessionLocal session, Value v1, Value v2)	Returns the value of this function.
boolean	isConstant()	Check if this expression will always return the same value.
Expression	optimize(SessionLocal session)	Try to optimize the expression.

Methods inherited from class org.h2.expression.function.Function1_2

getValue

Methods inherited from class org.h2.expression.Operation1_2

getCost, getSubexpression, getSubexpressionCount, getType, isEverything, mapColumns, 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, 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

Constructor Details

CastSpecification

public CastSpecification(Expression arg,
 Column column,
 Expression template)

CastSpecification

public CastSpecification(Expression arg,
 Column column)

CastSpecification

public CastSpecification(Expression arg,
 TypeInfo type)

Method Details

getValue

protected Value getValue(SessionLocal session,
 Value v1,
 Value v2)

Description copied from class: Function1_2

Returns the value of this function.

Overrides:

getValue in class Function1_2

Parameters:

session - the session

v1 - the value of first argument

v2 - the value of second argument, or null

Returns:

the resulting value

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

getTypeIfStaticallyKnown

public TypeInfo getTypeIfStaticallyKnown(SessionLocal session)

Description copied from class: Expression

Returns data type of this expression if it is statically known.

Overrides:

getTypeIfStaticallyKnown in class Expression

Parameters:

session - the session

Returns:

data type or null

isConstant

public boolean isConstant()

Description copied from class: Expression

Check if this expression will always return the same value.

Overrides:

isConstant in class Expression

Returns:

if the expression is constant

getUnenclosedSQL

public StringBuilder getUnenclosedSQL(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 Function1_2

Parameters:

builder - string builder

sqlFlags - formatting flags

Returns:

the specified string builder

getName

public String getName()

Description copied from interface: NamedExpression

Get the name.

Returns:

the name in uppercase