程序包 org.hibernate.dialect.function

类 CastFunction

java.lang.Object

org.hibernate.dialect.function.CastFunction

所有已实现的接口:

SQLFunction

public class CastFunction
extends Object
implements SQLFunction

ANSI-SQL style cast(foo as type) where the type is a Hibernate type

作者:

Gavin King

字段概要

字段

修饰符和类型	字段	说明
static CastFunction	INSTANCE	Singleton access

构造器概要

构造器

构造器	说明
CastFunction()

方法概要

修饰符和类型	方法	说明
Type	getReturnType(Type columnType, Mapping mapping)	The return type of the function.
boolean	hasArguments()	Does this function have any arguments?
boolean	hasParenthesesIfNoArguments()	If there are no arguments, are parentheses required?
String	render(Type columnType, List args, SessionFactoryImplementor factory)	Render the function call as SQL fragment.

从类继承的方法 java.lang.Object

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

字段详细资料

INSTANCE

public static final CastFunction INSTANCE

Singleton access

构造器详细资料

CastFunction

public CastFunction()

方法详细资料

hasArguments

public boolean hasArguments()

从接口复制的说明: SQLFunction

Does this function have any arguments?

指定者:

hasArguments 在接口中 SQLFunction

返回:

True if the function expects to have parameters; false otherwise.

hasParenthesesIfNoArguments

public boolean hasParenthesesIfNoArguments()

从接口复制的说明: SQLFunction

If there are no arguments, are parentheses required?

指定者:

hasParenthesesIfNoArguments 在接口中 SQLFunction

返回:

True if a no-arg call of this function requires parentheses.

getReturnType

public Type getReturnType(Type columnType,
                          Mapping mapping)
                   throws QueryException

从接口复制的说明: SQLFunction

The return type of the function. May be either a concrete type which is preset, or variable depending upon the type of the first function argument.

Note, the 'firstArgumentType' parameter should match the one passed into SQLFunction.render(org.hibernate.type.Type, java.util.List, org.hibernate.engine.spi.SessionFactoryImplementor)

指定者:

getReturnType 在接口中 SQLFunction

参数:

columnType - The type of the first argument

mapping - The mapping source.

返回:

The type to be expected as a return.

抛出:

QueryException - Indicates an issue resolving the return type.

render

public String render(Type columnType,
                     List args,
                     SessionFactoryImplementor factory)
              throws QueryException

从接口复制的说明: SQLFunction

Render the function call as SQL fragment.

Note, the 'firstArgumentType' parameter should match the one passed into SQLFunction.getReturnType(org.hibernate.type.Type, org.hibernate.engine.spi.Mapping)

指定者:

render 在接口中 SQLFunction

参数:

columnType - The type of the first argument

args - The function arguments

factory - The SessionFactory

返回:

The rendered function call

抛出:

QueryException - Indicates a problem rendering the function call.