Package org.h2.expression.function
Class RandFunction
java.lang.Object
org.h2.expression.Expression
org.h2.expression.function.Function0_1
org.h2.expression.function.RandFunction
- All Implemented Interfaces:
NamedExpression
,HasSQL
,Typed
A RAND, SECURE_RAND, or RANDOM_UUID function.
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Field Summary
FieldsModifier and TypeFieldDescriptionprivate final int
private static final String[]
static final int
RAND() (non-standard).static final int
RANDOM_UUID() (non-standard).static final int
SECURE_RAND() (non-standard).Fields inherited from class org.h2.expression.function.Function0_1
arg, type
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 TypeMethodDescriptiongetName()
Get the name.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.optimize
(SessionLocal session) Try to optimize the expression.Methods inherited from class org.h2.expression.function.Function0_1
getCost, getSubexpression, getSubexpressionCount, getType, getUnenclosedSQL, mapColumns, 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, 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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RAND
public static final int RANDRAND() (non-standard).- See Also:
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SECURE_RAND
public static final int SECURE_RANDSECURE_RAND() (non-standard).- See Also:
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RANDOM_UUID
public static final int RANDOM_UUIDRANDOM_UUID() (non-standard).- See Also:
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NAMES
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function
private final int function
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Constructor Details
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RandFunction
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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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optimize
Description copied from class:Expression
Try to optimize the expression.- Specified by:
optimize
in classExpression
- Parameters:
session
- the session- Returns:
- the optimized expression
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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.- Overrides:
isEverything
in classFunction0_1
- Parameters:
visitor
- the visitor- Returns:
- if the criteria can be fulfilled
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getName
Description copied from interface:NamedExpression
Get the name.- Returns:
- the name in uppercase
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