Package org.h2.expression.function

Class SysInfoFunction

java.lang.Object

org.h2.expression.Expression

org.h2.expression.Operation0

org.h2.expression.function.SysInfoFunction

All Implemented Interfaces:

NamedExpression, HasSQL, Typed

public final class SysInfoFunction
extends Operation0
implements NamedExpression

Database or session information function.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	AUTOCOMMIT	AUTOCOMMIT().
static final int	DATABASE_PATH	DATABASE_PATH().
static final int	H2VERSION	H2VERSION().
static final int	LOCK_MODE	LOCK_MODE().
static final int	LOCK_TIMEOUT	LOCK_TIMEOUT().
static final int	MEMORY_FREE	MEMORY_FREE().
static final int	MEMORY_USED	MEMORY_USED().
static final int	READONLY	READONLY().
static final int	SESSION_ID	SESSION_ID().
static final int	TRANSACTION_ID	TRANSACTION_ID().

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
SysInfoFunction(int function)

Method Summary

Modifier and Type	Method	Description
int	getCost()	Estimate the cost to process the expression.
String	getName()	Get the name.
static String	getName(int function)	Get the name for this function id.
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

AUTOCOMMIT

public static final int AUTOCOMMIT

AUTOCOMMIT().

See Also:

• Constant Field Values

DATABASE_PATH

public static final int DATABASE_PATH

DATABASE_PATH().

See Also:

• Constant Field Values

H2VERSION

public static final int H2VERSION

H2VERSION().

See Also:

• Constant Field Values

LOCK_MODE

public static final int LOCK_MODE

LOCK_MODE().

See Also:

• Constant Field Values

LOCK_TIMEOUT

public static final int LOCK_TIMEOUT

LOCK_TIMEOUT().

See Also:

• Constant Field Values

MEMORY_FREE

public static final int MEMORY_FREE

MEMORY_FREE().

See Also:

• Constant Field Values

MEMORY_USED

public static final int MEMORY_USED

MEMORY_USED().

See Also:

• Constant Field Values

READONLY

public static final int READONLY

READONLY().

See Also:

• Constant Field Values

SESSION_ID

public static final int SESSION_ID

SESSION_ID().

See Also:

• Constant Field Values

TRANSACTION_ID

public static final int TRANSACTION_ID

TRANSACTION_ID().

See Also:

• Constant Field Values

Constructor Details

SysInfoFunction

public SysInfoFunction(int function)

Method Details

getName

public static String getName(int function)

Get the name for this function id.

Parameters:

function - the function id

Returns:

the name

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