org.h2.expression

Class TypedValueExpression

java.lang.Object

org.h2.expression.Expression

org.h2.expression.Operation0

org.h2.expression.ValueExpression

org.h2.expression.TypedValueExpression

All Implemented Interfaces:

HasSQL, Typed

public class TypedValueExpression
extends ValueExpression

An expression representing a constant value with a type cast.

Field Summary

Fields

Modifier and Type	Field and Description
static TypedValueExpression	UNKNOWN The expression represents the SQL UNKNOWN value.

Fields inherited from class org.h2.expression.ValueExpression

DEFAULT, FALSE, NULL, TRUE

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 and Description
static ValueExpression	get(Value value, TypeInfo type) Create a new expression with the given value and type.
TypeInfo	getType() Returns the data type.
static ValueExpression	getTypedIfNull(Value value, TypeInfo type) Create a new typed value expression with the given value and type if value is NULL, or a plain value expression otherwise.
java.lang.StringBuilder	getUnenclosedSQL(java.lang.StringBuilder builder, int sqlFlags) Get the SQL statement of this expression.
boolean	isNullConstant() Check if this expression will always return the NULL value.

Methods inherited from class org.h2.expression.ValueExpression

createIndexConditions, get, getBoolean, getBoolean, getCost, getNotIfPossible, getValue, isConstant, isEverything, isValueSet

Methods inherited from class org.h2.expression.Operation0

mapColumns, optimize, setEvaluatable, updateAggregate

Methods inherited from class org.h2.expression.Expression

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

UNKNOWN

public static final TypedValueExpression UNKNOWN

The expression represents the SQL UNKNOWN value.

Method Detail

get

public static ValueExpression get(Value value,
                                  TypeInfo type)

Create a new expression with the given value and type.

Parameters:

value - the value

type - the value type

Returns:

the expression

getTypedIfNull

public static ValueExpression getTypedIfNull(Value value,
                                             TypeInfo type)

Create a new typed value expression with the given value and type if value is NULL, or a plain value expression otherwise.

Parameters:

value - the value

type - the value type

Returns:

the expression

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 Typed

Overrides:

getType in class ValueExpression

Returns:

the data type

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 ValueExpression

Parameters:

builder - string builder

sqlFlags - formatting flags

Returns:

the specified string builder

isNullConstant

public boolean isNullConstant()

Description copied from class: Expression

Check if this expression will always return the NULL value.

Overrides:

isNullConstant in class ValueExpression

Returns:

if the expression is constant NULL value