org.h2.expression.function

类 HashFunction

java.lang.Object

org.h2.expression.Expression

org.h2.expression.OperationN

org.h2.expression.function.FunctionN

org.h2.expression.function.HashFunction

所有已实现的接口:

ExpressionWithVariableParameters, NamedExpression, HasSQL, Typed

public final class HashFunction
extends FunctionN

A HASH or ORA_HASH function.

字段概要

字段

限定符和类型	字段和说明
static int	HASH HASH() (non-standard).
static int	ORA_HASH ORA_HASH() (non-standard).

从类继承的字段 org.h2.expression.OperationN

args, argsCount, type

从类继承的字段 org.h2.expression.Expression

AUTO_PARENTHESES, MAP_IN_AGGREGATE, MAP_IN_WINDOW, MAP_INITIAL, WITH_PARENTHESES, WITHOUT_PARENTHESES

从接口继承的字段 org.h2.util.HasSQL

ADD_PLAN_INFORMATION, DEFAULT_SQL_FLAGS, NO_CASTS, QUOTE_ONLY_WHEN_REQUIRED, REPLACE_LOBS_FOR_TRACE, TRACE_SQL_FLAGS

构造器概要

构造器

构造器和说明
HashFunction(Expression arg1, Expression arg2, Expression arg3, int function)
HashFunction(Expression arg, int function)

方法概要

限定符和类型	方法和说明
String	getName() Get the name.
Value	getValue(SessionLocal session, Value v1, Value v2, Value v3) Returns the value of this function.
Expression	optimize(SessionLocal session) Try to optimize the expression.

从类继承的方法 org.h2.expression.function.FunctionN

getUnenclosedSQL, getValue

从类继承的方法 org.h2.expression.OperationN

addParameter, doneWithParameters, getCost, getSubexpression, getSubexpressionCount, getType, isEverything, mapColumns, optimizeArguments, setEvaluatable, updateAggregate

从类继承的方法 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

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

从接口继承的方法 org.h2.util.HasSQL

getTraceSQL

字段详细资料

HASH

public static final int HASH

HASH() (non-standard).

另请参阅:

常量字段值

ORA_HASH

public static final int ORA_HASH

ORA_HASH() (non-standard).

另请参阅:

常量字段值

构造器详细资料

HashFunction

public HashFunction(Expression arg,
                    int function)

HashFunction

public HashFunction(Expression arg1,
                    Expression arg2,
                    Expression arg3,
                    int function)

方法详细资料

getValue

public Value getValue(SessionLocal session,
                      Value v1,
                      Value v2,
                      Value v3)

从类复制的说明: FunctionN

Returns the value of this function.

覆盖:

getValue 在类中 FunctionN

参数:

session - the session

v1 - the value of first argument, or null

v2 - the value of second argument, or null

v3 - the value of third argument, or null

返回:

the resulting value

optimize

public Expression optimize(SessionLocal session)

从类复制的说明: Expression

Try to optimize the expression.

指定者:

optimize 在类中 Expression

参数:

session - the session

返回:

the optimized expression

getName

public String getName()

从接口复制的说明: NamedExpression

Get the name.

返回:

the name in uppercase