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SQLFunctionTemplate (Hibernate API Documentation) - Hibernate 3.2.3 正式版 API 英文文档

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org.hibernate.dialect.function
Class SQLFunctionTemplate

java.lang.Object
  org.hibernate.dialect.function.SQLFunctionTemplate

All Implemented Interfaces:

SQLFunction

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public class SQLFunctionTemplate

extends Object

implements SQLFunction

Represents HQL functions that can have different representations in different SQL dialects. E.g. in HQL we can define function concat(?1, ?2) to concatenate two strings p1 and p2. Target SQL function will be dialect-specific, e.g. (?1 || ?2) for Oracle, concat(?1, ?2) for MySql, (?1 + ?2) for MS SQL. Each dialect will define a template as a string (exactly like above) marking function parameters with '?' followed by parameter's index (first index is 1).

Version:

$Revision: 6608 $

Author:

Alexey Loubyansky

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Constructor Summary

SQLFunctionTemplate(Type type, String template)

SQLFunctionTemplate(Type type, String template, boolean hasParenthesesIfNoArgs)

 

Method Summary
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 parens required?
String	render(List args, SessionFactoryImplementor factory)           Applies the template to passed in arguments.
String	toString()

 

Methods inherited from class java.lang.Object

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

 

Constructor Detail

SQLFunctionTemplate

public SQLFunctionTemplate(Type type,
                           String template)

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SQLFunctionTemplate

public SQLFunctionTemplate(Type type,
                           String template,
                           boolean hasParenthesesIfNoArgs)

Method Detail

render

public String render(List args,
                     SessionFactoryImplementor factory)

Applies the template to passed in arguments.

Specified by:

render in interface SQLFunction

Parameters:

args - function arguments

factory - The SessionFactory

Returns:

generated SQL function call

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getReturnType

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

Description copied from interface: 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.

Specified by:

getReturnType in interface SQLFunction

Parameters:

columnType - the type of the first argument

mapping - The mapping source.

Returns:

The type to be expected as a return.

Throws:

QueryException - Indicates an issue resolving the return type.

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hasArguments

public boolean hasArguments()

Description copied from interface: SQLFunction

Does this function have any arguments?

Specified by:

hasArguments in interface SQLFunction

Returns:

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

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hasParenthesesIfNoArguments

public boolean hasParenthesesIfNoArguments()

Description copied from interface: SQLFunction

If there are no arguments, are parens required?

Specified by:

hasParenthesesIfNoArguments in interface SQLFunction

Returns:

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

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toString

public String toString()

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