Package org.h2.expression.function
Class SysInfoFunction
- java.lang.Object
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- org.h2.expression.Expression
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- org.h2.expression.Operation0
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- org.h2.expression.function.SysInfoFunction
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- All Implemented Interfaces:
NamedExpression
,HasSQL
,Typed
public final class SysInfoFunction extends Operation0 implements NamedExpression
Database or session information function.
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Field Summary
Fields Modifier and Type Field Description static int
AUTOCOMMIT
AUTOCOMMIT().static int
DATABASE_PATH
DATABASE_PATH().private int
function
static int
H2VERSION
H2VERSION().static int
LOCK_MODE
LOCK_MODE().static int
LOCK_TIMEOUT
LOCK_TIMEOUT().static int
MEMORY_FREE
MEMORY_FREE().static int
MEMORY_USED
MEMORY_USED().private static java.lang.String[]
NAMES
static int
READONLY
READONLY().static int
SESSION_ID
SESSION_ID().static int
TRANSACTION_ID
TRANSACTION_ID().private TypeInfo
type
private static int[]
TYPES
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Fields inherited from class org.h2.expression.Expression
AUTO_PARENTHESES, MAP_IN_AGGREGATE, MAP_IN_WINDOW, MAP_INITIAL, WITH_PARENTHESES, WITHOUT_PARENTHESES
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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 Constructor Description SysInfoFunction(int function)
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description int
getCost()
Estimate the cost to process the expression.java.lang.String
getName()
Get the name.static java.lang.String
getName(int function)
Get the name for this function id.TypeInfo
getType()
Returns the data type.java.lang.StringBuilder
getUnenclosedSQL(java.lang.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
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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
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
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Methods inherited from interface org.h2.util.HasSQL
getTraceSQL
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Field Detail
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AUTOCOMMIT
public static final int AUTOCOMMIT
AUTOCOMMIT().- See Also:
- Constant Field Values
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DATABASE_PATH
public static final int DATABASE_PATH
DATABASE_PATH().- See Also:
- Constant Field Values
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H2VERSION
public static final int H2VERSION
H2VERSION().- See Also:
- Constant Field Values
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LOCK_MODE
public static final int LOCK_MODE
LOCK_MODE().- See Also:
- Constant Field Values
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LOCK_TIMEOUT
public static final int LOCK_TIMEOUT
LOCK_TIMEOUT().- See Also:
- Constant Field Values
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MEMORY_FREE
public static final int MEMORY_FREE
MEMORY_FREE().- See Also:
- Constant Field Values
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MEMORY_USED
public static final int MEMORY_USED
MEMORY_USED().- See Also:
- Constant Field Values
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READONLY
public static final int READONLY
READONLY().- See Also:
- Constant Field Values
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SESSION_ID
public static final int SESSION_ID
SESSION_ID().- See Also:
- Constant Field Values
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TRANSACTION_ID
public static final int TRANSACTION_ID
TRANSACTION_ID().- See Also:
- Constant Field Values
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TYPES
private static final int[] TYPES
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NAMES
private static final java.lang.String[] NAMES
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function
private final int function
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type
private final TypeInfo type
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Method Detail
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getName
public static java.lang.String getName(int function)
Get the name for this function id.- Parameters:
function
- the function id- Returns:
- the name
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getValue
public Value getValue(SessionLocal session)
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
public java.lang.StringBuilder getUnenclosedSQL(java.lang.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 classExpression
- Parameters:
builder
- string buildersqlFlags
- formatting flags- Returns:
- the specified string builder
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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 classExpression
- Parameters:
visitor
- the visitor- Returns:
- if the criteria can be fulfilled
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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 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
public java.lang.String getName()
Description copied from interface:NamedExpression
Get the name.- Specified by:
getName
in interfaceNamedExpression
- Returns:
- the name in uppercase
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