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

public final Class RandFunction

extends Function0_1
Class Inheritance
Imports
java.util.Random, org.h2.engine.SessionLocal, org.h2.expression.Expression, .ExpressionVisitor, org.h2.message.DbException, org.h2.util.MathUtils, org.h2.value.TypeInfo, .Value, .ValueDouble, .ValueNull, .ValueUuid, .ValueVarbinary
A RAND, SECURE_RAND, or RANDOM_UUID function.

Field Summary

Modifier and TypeField and Description
private final int
function

private static final String[]
NAMES

public static final int
RAND

RAND() (non-standard).

public static final int
RANDOM_UUID

RANDOM_UUID() (non-standard).

public static final int
SECURE_RAND

SECURE_RAND() (non-standard).

Inherited from org.h2.expression.function.Function0_1:
argtype

Constructor Summary

AccessConstructor and Description
public
RandFunction(Expression arg, int function)

Method Summary

Modifier and TypeMethod and Description
public String
getName()

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

Get the name.

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)

Overrides org.h2.expression.function.Function0_1.isEverything.

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

public Expression
optimize(SessionLocal
the session
session)

Implements abstract org.h2.expression.Expression.optimize.

Try to optimize the expression.

Inherited from org.h2.expression.function.Function0_1:
getCostgetSubexpressiongetSubexpressionCountgetTypegetUnenclosedSQLmapColumnssetEvaluatableupdateAggregate

Field Detail

functionback to summary
private final int function
NAMESback to summary
private static final String[] NAMES
RANDback to summary
public static final int RAND

RAND() (non-standard).

RANDOM_UUIDback to summary
public static final int RANDOM_UUID

RANDOM_UUID() (non-standard).

SECURE_RANDback to summary
public static final int SECURE_RAND

SECURE_RAND() (non-standard).

Constructor Detail

RandFunctionback to summary
public RandFunction(Expression arg, int function)

Method Detail

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
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)

Overrides org.h2.expression.function.Function0_1.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
optimizeback to summary
public Expression optimize(SessionLocal session)

Implements abstract org.h2.expression.Expression.optimize.

Doc from org.h2.expression.Expression.optimize.

Try to optimize the expression.

Parameters
session:SessionLocal

the session

Returns:Expression

the optimized expression

Annotations
@Override