org.h2.expression.function

类 LengthFunction

java.lang.Object

org.h2.expression.Expression

org.h2.expression.Operation1

org.h2.expression.function.Function1

org.h2.expression.function.LengthFunction

所有已实现的接口:

NamedExpression, HasSQL, Typed

public final class LengthFunction
extends Function1

CHAR_LENGTH(), or OCTET_LENGTH() function.

字段概要

字段

限定符和类型	字段和说明
static int	BIT_LENGTH BIT_LENGTH() (non-standard).
static int	CHAR_LENGTH CHAR_LENGTH().
static int	OCTET_LENGTH OCTET_LENGTH().

从类继承的字段 org.h2.expression.Operation1

arg, 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
LengthFunction(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) Return the resulting value for the current row.
Expression	optimize(SessionLocal session) Try to optimize the expression.

从类继承的方法 org.h2.expression.function.Function1

getUnenclosedSQL

从类继承的方法 org.h2.expression.Operation1

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

CHAR_LENGTH

public static final int CHAR_LENGTH

CHAR_LENGTH().

另请参阅:

常量字段值

OCTET_LENGTH

public static final int OCTET_LENGTH

OCTET_LENGTH().

另请参阅:

常量字段值

BIT_LENGTH

public static final int BIT_LENGTH

BIT_LENGTH() (non-standard).

另请参阅:

常量字段值

构造器详细资料

LengthFunction

public LengthFunction(Expression arg,
                      int function)

方法详细资料

getValue

public Value getValue(SessionLocal session)

从类复制的说明: Expression

Return the resulting value for the current row.

指定者:

getValue 在类中 Expression

参数:

session - the session

返回:

the result

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