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
Database or session information function.
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Field Summary
FieldsModifier and TypeFieldDescriptionstatic final int
AUTOCOMMIT().static final int
DATABASE_PATH().private final int
static final int
H2VERSION().static final int
LOCK_MODE().static final int
LOCK_TIMEOUT().static final int
MEMORY_FREE().static final int
MEMORY_USED().private static final String[]
static final int
READONLY().static final int
SESSION_ID().static final int
TRANSACTION_ID().private final TypeInfo
private static final int[]
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.static String
getName
(int function) Get the name for this function id.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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AUTOCOMMIT
public static final int AUTOCOMMITAUTOCOMMIT().- See Also:
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DATABASE_PATH
public static final int DATABASE_PATHDATABASE_PATH().- See Also:
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H2VERSION
public static final int H2VERSIONH2VERSION().- See Also:
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LOCK_MODE
public static final int LOCK_MODELOCK_MODE().- See Also:
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LOCK_TIMEOUT
public static final int LOCK_TIMEOUTLOCK_TIMEOUT().- See Also:
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MEMORY_FREE
public static final int MEMORY_FREEMEMORY_FREE().- See Also:
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MEMORY_USED
public static final int MEMORY_USEDMEMORY_USED().- See Also:
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READONLY
public static final int READONLYREADONLY().- See Also:
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SESSION_ID
public static final int SESSION_IDSESSION_ID().- See Also:
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TRANSACTION_ID
public static final int TRANSACTION_IDTRANSACTION_ID().- See Also:
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TYPES
private static final int[] TYPES -
NAMES
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function
private final int function -
type
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Constructor Details
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SysInfoFunction
public SysInfoFunction(int function)
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Method Details
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getName
Get the name for this function id.- Parameters:
function
- the function id- Returns:
- the name
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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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