org.h2.expression.function

类 CompressFunction

java.lang.Object

org.h2.expression.Expression

org.h2.expression.Operation1_2

org.h2.expression.function.Function1_2

org.h2.expression.function.CompressFunction

所有已实现的接口:

NamedExpression, HasSQL, Typed

public final class CompressFunction
extends Function1_2

A COMPRESS or EXPAND function.

字段概要

字段

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

从类继承的字段 org.h2.expression.Operation1_2

left, right, 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
CompressFunction(Expression arg1, Expression arg2, 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) 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.Function1_2

getUnenclosedSQL, getValue

从类继承的方法 org.h2.expression.Operation1_2

getCost, getSubexpression, getSubexpressionCount, getType, isEverything, mapColumns, 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

COMPRESS

public static final int COMPRESS

COMPRESS() (non-standard).

另请参阅:

常量字段值

EXPAND

public static final int EXPAND

EXPAND() (non-standard).

另请参阅:

常量字段值

构造器详细资料

CompressFunction

public CompressFunction(Expression arg1,
                        Expression arg2,
                        int function)

方法详细资料

getValue

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

从类复制的说明: Function1_2

Returns the value of this function.

覆盖:

getValue 在类中 Function1_2

参数:

session - the session

v1 - the value of first argument

v2 - the value of second 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