org.h2.expression.function

类 CastSpecification

java.lang.Object

org.h2.expression.Expression

org.h2.expression.Operation1

org.h2.expression.function.Function1

org.h2.expression.function.CastSpecification

所有已实现的接口:

NamedExpression, HasSQL, Typed

public final class CastSpecification
extends Function1

A cast specification.

字段概要

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
CastSpecification(Expression arg, Column column)
CastSpecification(Expression arg, TypeInfo type)

方法概要

限定符和类型	方法和说明
String	getName() Get the name.
StringBuilder	getUnenclosedSQL(StringBuilder builder, int sqlFlags) Get the SQL statement of this expression.
Value	getValue(SessionLocal session) Return the resulting value for the current row.
boolean	isConstant() Check if this expression will always return the same value.
Expression	optimize(SessionLocal session) Try to optimize the expression.

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, 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

构造器详细资料

CastSpecification

public CastSpecification(Expression arg,
                         Column column)

CastSpecification

public CastSpecification(Expression arg,
                         TypeInfo type)

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

isConstant

public boolean isConstant()

从类复制的说明: Expression

Check if this expression will always return the same value.

覆盖:

isConstant 在类中 Expression

返回:

if the expression is constant

getUnenclosedSQL

public StringBuilder getUnenclosedSQL(StringBuilder builder,
                                      int sqlFlags)

从类复制的说明: Expression

Get the SQL statement of this expression. This may not always be the original SQL statement, especially after optimization. Enclosing '(' and ')' are never appended.

覆盖:

getUnenclosedSQL 在类中 Function1

参数:

builder - string builder

sqlFlags - formatting flags

返回:

the specified string builder

getName

public String getName()

从接口复制的说明: NamedExpression

Get the name.

返回:

the name in uppercase