Package org.h2.expression.function

Class CurrentGeneralValueSpecification

java.lang.Object

org.h2.expression.Expression

org.h2.expression.Operation0

org.h2.expression.function.CurrentGeneralValueSpecification

All Implemented Interfaces:

NamedExpression, HasSQL, Typed

public final class CurrentGeneralValueSpecification
extends Operation0
implements NamedExpression

Simple general value specifications.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	CURRENT_CATALOG	The "CURRENT_CATALOG" general value specification.
static final int	CURRENT_PATH	The "CURRENT_PATH" general value specification.
static final int	CURRENT_ROLE	The function "CURRENT_ROLE" general value specification.
static final int	CURRENT_SCHEMA	The function "CURRENT_SCHEMA" general value specification.
static final int	CURRENT_USER	The function "CURRENT_USER" general value specification.
static final int	SESSION_USER	The function "SESSION_USER" general value specification.
static final int	SYSTEM_USER	The function "SYSTEM_USER" general value specification.

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
CurrentGeneralValueSpecification(int specification)

Method Summary

Modifier and Type	Method	Description
int	getCost()	Estimate the cost to process the expression.
String	getName()	Get the name.
TypeInfo	getType()	Returns the data type.
StringBuilder	getUnenclosedSQL(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.

Methods inherited from class org.h2.expression.Operation0

mapColumns, optimize, 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, getSubexpression, getSubexpressionCount, getTableAlias, getTableName, getTypeIfStaticallyKnown, 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 Details

CURRENT_CATALOG

public static final int CURRENT_CATALOG

The "CURRENT_CATALOG" general value specification.

See Also:

• Constant Field Values

CURRENT_PATH

public static final int CURRENT_PATH

The "CURRENT_PATH" general value specification.

See Also:

• Constant Field Values

CURRENT_ROLE

public static final int CURRENT_ROLE

The function "CURRENT_ROLE" general value specification.

See Also:

• Constant Field Values

CURRENT_SCHEMA

public static final int CURRENT_SCHEMA

The function "CURRENT_SCHEMA" general value specification.

See Also:

• Constant Field Values

CURRENT_USER

public static final int CURRENT_USER

The function "CURRENT_USER" general value specification.

See Also:

• Constant Field Values

SESSION_USER

public static final int SESSION_USER

The function "SESSION_USER" general value specification.

See Also:

• Constant Field Values

SYSTEM_USER

public static final int SYSTEM_USER

The function "SYSTEM_USER" general value specification.

See Also:

• Constant Field Values

Constructor Details

CurrentGeneralValueSpecification

public CurrentGeneralValueSpecification(int specification)

Method Details

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

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.

Specified by:

getUnenclosedSQL in class Expression

Parameters:

builder - string builder

sqlFlags - formatting flags

Returns:

the specified string builder

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

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

Specified by:

getType in class Expression

Returns:

the data type

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

getName

public String getName()

Description copied from interface: NamedExpression

Get the name.

Specified by:

getName in interface NamedExpression

Returns:

the name in uppercase