Top Description Fields Constructors Methods
org.h2.expression.function

public final Class CurrentGeneralValueSpecification

extends Operation0
implements NamedExpression
Class Inheritance
All Implemented Interfaces
org.h2.expression.function.NamedExpression
Imports
org.h2.engine.Database, .SessionLocal, org.h2.expression.ExpressionVisitor, .Operation0, org.h2.message.DbException, org.h2.util.HasSQL, .ParserUtil, .StringUtils, org.h2.value.TypeInfo, .Value, .ValueNull, .ValueVarchar
Simple general value specifications.

Field Summary

Modifier and TypeField and Description
public static final int
CURRENT_CATALOG

The "CURRENT_CATALOG" general value specification.

public static final int
CURRENT_PATH

The "CURRENT_PATH" general value specification.

public static final int
CURRENT_ROLE

The function "CURRENT_ROLE" general value specification.

public static final int
CURRENT_SCHEMA

The function "CURRENT_SCHEMA" general value specification.

public static final int
CURRENT_USER

The function "CURRENT_USER" general value specification.

private static final String[]
NAMES

public static final int
SESSION_USER

The function "SESSION_USER" general value specification.

private final int
specification

public static final int
SYSTEM_USER

The function "SYSTEM_USER" general value specification.

Constructor Summary

AccessConstructor and Description
public
CurrentGeneralValueSpecification(int specification)

Method Summary

Modifier and TypeMethod and Description
public int
getCost()

Implements abstract org.h2.expression.Expression.getCost.

Estimate the cost to process the expression.

public String
getName()

Implements org.h2.expression.function.NamedExpression.getName.

Get the name.

public TypeInfo
getType()

Implements abstract org.h2.expression.Expression.getType.

Implements org.h2.value.Typed.getType.

Returns the data type.

public StringBuilder
getUnenclosedSQL(StringBuilder
string builder
builder, int
formatting flags
sqlFlags)

Implements abstract org.h2.expression.Expression.getUnenclosedSQL.

Get the SQL statement of this expression.

public Value
getValue(SessionLocal
the session
session)

Implements abstract org.h2.expression.Expression.getValue.

Return the resulting value for the current row.

public boolean
isEverything(ExpressionVisitor
the visitor
visitor)

Implements abstract org.h2.expression.Expression.isEverything.

Check if this expression and all sub-expressions can fulfill a criteria.

Inherited from org.h2.expression.Operation0:
mapColumnsoptimizesetEvaluatableupdateAggregate

Field Detail

CURRENT_CATALOGback to summary
public static final int CURRENT_CATALOG

The "CURRENT_CATALOG" general value specification.

CURRENT_PATHback to summary
public static final int CURRENT_PATH

The "CURRENT_PATH" general value specification.

CURRENT_ROLEback to summary
public static final int CURRENT_ROLE

The function "CURRENT_ROLE" general value specification.

CURRENT_SCHEMAback to summary
public static final int CURRENT_SCHEMA

The function "CURRENT_SCHEMA" general value specification.

CURRENT_USERback to summary
public static final int CURRENT_USER

The function "CURRENT_USER" general value specification.

NAMESback to summary
private static final String[] NAMES
SESSION_USERback to summary
public static final int SESSION_USER

The function "SESSION_USER" general value specification.

specificationback to summary
private final int specification
SYSTEM_USERback to summary
public static final int SYSTEM_USER

The function "SYSTEM_USER" general value specification.

Constructor Detail

CurrentGeneralValueSpecificationback to summary
public CurrentGeneralValueSpecification(int specification)

Method Detail

getCostback to summary
public int getCost()

Implements abstract org.h2.expression.Expression.getCost.

Doc from org.h2.expression.Expression.getCost.

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

Returns:int

the estimated cost

Annotations
@Override
getNameback to summary
public String getName()

Implements org.h2.expression.function.NamedExpression.getName.

Doc from org.h2.expression.function.NamedExpression.getName.

Get the name.

Returns:String

the name in uppercase

Annotations
@Override
getTypeback to summary
public TypeInfo getType()

Implements abstract org.h2.expression.Expression.getType.

Implements org.h2.value.Typed.getType.

Doc from org.h2.expression.Expression.getType.

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

Returns:TypeInfo

the data type

Annotations
@Override
getUnenclosedSQLback to summary
public StringBuilder getUnenclosedSQL(StringBuilder builder, int sqlFlags)

Implements abstract org.h2.expression.Expression.getUnenclosedSQL.

Doc from org.h2.expression.Expression.getUnenclosedSQL.

Get the SQL statement of this expression. This may not always be the original SQL statement, especially after optimization. Enclosing '(' and ')' are never appended.

Parameters
builder:StringBuilder

string builder

sqlFlags:int

formatting flags

Returns:StringBuilder

the specified string builder

Annotations
@Override
getValueback to summary
public Value getValue(SessionLocal session)

Implements abstract org.h2.expression.Expression.getValue.

Doc from org.h2.expression.Expression.getValue.

Return the resulting value for the current row.

Parameters
session:SessionLocal

the session

Returns:Value

the result

Annotations
@Override
isEverythingback to summary
public boolean isEverything(ExpressionVisitor visitor)

Implements abstract org.h2.expression.Expression.isEverything.

Doc from org.h2.expression.Expression.isEverything.

Check if this expression and all sub-expressions can fulfill a criteria. If any part returns false, the result is false.

Parameters
visitor:ExpressionVisitor

the visitor

Returns:boolean

if the criteria can be fulfilled

Annotations
@Override