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
Simple general value specifications.
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Field Summary
FieldsModifier and TypeFieldDescriptionstatic final int
The "CURRENT_CATALOG" general value specification.static final int
The "CURRENT_PATH" general value specification.static final int
The function "CURRENT_ROLE" general value specification.static final int
The function "CURRENT_SCHEMA" general value specification.static final int
The function "CURRENT_USER" general value specification.private static final String[]
static final int
The function "SESSION_USER" general value specification.private final int
static final int
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
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionint
getCost()
Estimate the cost to process the expression.getName()
Get the name.getType()
Returns the data type.getUnenclosedSQL
(StringBuilder builder, int sqlFlags) Get the SQL statement of this expression.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, 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
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Field Details
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CURRENT_CATALOG
public static final int CURRENT_CATALOGThe "CURRENT_CATALOG" general value specification.- See Also:
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CURRENT_PATH
public static final int CURRENT_PATHThe "CURRENT_PATH" general value specification.- See Also:
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CURRENT_ROLE
public static final int CURRENT_ROLEThe function "CURRENT_ROLE" general value specification.- See Also:
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CURRENT_SCHEMA
public static final int CURRENT_SCHEMAThe function "CURRENT_SCHEMA" general value specification.- See Also:
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CURRENT_USER
public static final int CURRENT_USERThe function "CURRENT_USER" general value specification.- See Also:
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SESSION_USER
public static final int SESSION_USERThe function "SESSION_USER" general value specification.- See Also:
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SYSTEM_USER
public static final int SYSTEM_USERThe function "SYSTEM_USER" general value specification.- See Also:
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NAMES
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specification
private final int specification
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Constructor Details
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CurrentGeneralValueSpecification
public CurrentGeneralValueSpecification(int specification)
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Method Details
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getValue
Description copied from class:Expression
Return the resulting value for the current row.- Specified by:
getValue
in classExpression
- Parameters:
session
- the session- Returns:
- the result
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getUnenclosedSQL
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 classExpression
- Parameters:
builder
- string buildersqlFlags
- formatting flags- Returns:
- the specified string builder
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isEverything
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 classExpression
- Parameters:
visitor
- the visitor- Returns:
- if the criteria can be fulfilled
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getType
Description copied from class:Expression
Returns the data type. The data type may be unknown before the optimization phase.- Specified by:
getType
in interfaceTyped
- Specified by:
getType
in classExpression
- Returns:
- the data type
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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 classExpression
- Returns:
- the estimated cost
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getName
Description copied from interface:NamedExpression
Get the name.- Specified by:
getName
in interfaceNamedExpression
- Returns:
- the name in uppercase
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