题记:
“低碳从拔下插头做起”,开源,从关注产品社区做起:)
发这个贴的的缘由是看了jnn大哥发的一篇关于开源软件的帖子http://www.iteye.com/topic/277696,虽然是08年写的,但里面说到follow社区的mail list的建议是不错的,想想自己还未奉献过代码,于是去ibaits的google社区瞅了一眼,其实只要你行动,提交一个被accepted的issue并不是那么困难。
以下就是展现一个最新被ibatis3.x接受的建议。(当然不是我commit的,希望以后有机会吧)
Reported by clinton.begin, May 17, 2010
Reporter: Travis Hein
Would it be possible to create a new annotation (or does one exist already
and I just have not found it yet), where I can specify that @Select results
should be a <resultMap> that exists in the mapper XML file ?
可以不可以为@select新增一个注解用于重用resultMap配置中定义的map。
For example,
比如:
Consider a "country" table,
CREATE TABLE COUNTRY
(
ID bigint PRIMARY KEY NOT NULL,
CODE varchar(2) NOT NULL,
ISO_CODE varchar(3) NOT NULL,
NAME varchar(2147483647),
COUNTRY_CODE varchar(10),
ACTIVE boolean DEFAULT TRUE NOT NULL
);
And the java Bean,
public class Country {
Long id;
String code; // 2 digit ISO country code
String isoCode; // 3 digit ISO country code
String name; // string name
String countryCode; // the telephone dialing prefix (e.g. +1)
boolean active = true;
// and all the get() set() methods for these bean properties
}
And then the mapper interface,
public interface CountryDAO {
/**
* Selects all country entries.
* Though it appears when we use the annotations, we need to specify the
results every time ?
*/
@Select( value = { "select * from country where active = true" })
@Results(value = {
@Result(property="id"),
@Result(property="code"),
@Result(property="isoCode", column="iso_code"),
@Result(property="name", column="name"),
@Result(property="countryCode", column="country_code"),
@Result(property="active", column="active")
})
List<Country> getAllActive();
// TODO: all these methods would also be select queries, where I would
want the same results map as above
Country getById(Long id);
Country getByCode(String code);
Country getByIsoCode(String isoCode);
}
这里每个方法都需要重复添加如上返回的map定义,就显的很冗余了。
Where, instead of the @Results annotation, which would need to be
duplicated with its nested @Result annotations on every select method that
I want to return the same mapping, what I would wish to have would be
something like a
@ResultMap(value="myMapperID") 作者想添加这个注解,替代上面的重复定义。
annotation, where the myMapperID would be the ID of a <resultMap> I have
declared in the mapper's xml file that will be included by the
SqlMapConfig.xml (which I have anyway to bind to this mapper interface, and
also because I have some more complex queries declared in the xml mapper
file too).
Where in this example, I already have a
<mapper namespace="CountryDAO">
<resultMap type="Country" id="countryResult">
<result property="id" column="id"/>
<result property="code" column="code"/>
<result property="isoCode" column="iso_code"/>
<result property="name" column="name"/>
<result property="countryCode" column="country_code"/>
<result property="active" column="active"/>
</resultMap>
So this wishful @ResultMap annotation would then make the mapper interface
look like:
修改后的代码变为:
public interface CountryDAO {
@Select( value = { "select * from country where active = true" })
@ResultMap(value = "countryResult")
List<Country> getAllActive();
// and now other things that want to select into this map can do so,
re-using the single map declaration
// that is referenced in the xml.
@Select( value = { "select * from country where id = #{id} })
@ResultMap(value = "countryResult")
Country getById(Long id);
@Select( value = { "select * from country where code = #{code} })
@ResultMap(value = "countryResult")
Country getByCode(String code);
@Select( value = { "select * from country where isoCode = #{isoCode} })
@ResultMap(value = "countryResult")
Country getByIsoCode(String isoCode);
}
I think having something like this @ResultMap annotation would be a good
thing to have, what do you think?
看到countryResult这个map已经在xml文件中定义好了,无需再每个方法前面重复定义了,只要声明就ok了。
分享到:
相关推荐
NULL 博文链接:https://wangjiankui1989.iteye.com/blog/1141198
ibatis-2.3.4.726.jar,ibatis-2.3.0.677.jar,ibatis-2.3.3.720.jar下载,都已放入一个压缩包下。
ibatis-2.3.3.720.jar
IBatis.DataMapper.1.6.2 和 IBatis.DataMapper.1.9 开发包
JAVA之ibatis2.3.X.ppt
ibatis对于Java中的应用,可能在积极的促进。
本文是个人在学习过程中的学习笔记,详细讲解了如何使用iBatis2.x以及如何将其与Struts2.x,Spring3.x进行整合开发,其中包括iBatis基础使用,存储过程调用和数据库函数的调用。
ibatis批处理.doc ibatis批处理.doc
ibatis.net官方组件 IBatis.DataMapper.1.6.2 IBatis.DataAccess.1.9.2
搭建mybatis所需包org.apache.ibatis.annotations.Param @Param
Manning.iBATIS.in.Action.Jan.2007.eBook-BBL.pdf Manning.iBATIS.in.Action.Jan.2007.eBook-BBL.pdf Manning.iBATIS.in.Action.Jan.2007.eBook-BBL.pdf
IBatisNet.Common.1.6.2、IBatis.DataAccess.1.9.2、IBatis.DataMapper.1.6.2
ibatismysql.jar ibatismysql.jar
《iBATIS实战》的最后给出了一个设计优雅、层次清晰的示例程序JGameStore,该示例涵盖全书的大部分知识点,可以作为iBATIS学习和Web开发的经典案例,非常值得深入研究。 编辑推荐 《iBATIS实战》既可为广大的开发...
ibatis实战.part07ibatis实战.part07ibatis实战.part07ibatis实战.part07ibatis实战.part07ibatis实战.part07ibatis实战.part07ibatis实战.part07ibatis实战.part07ibatis实战.part07ibatis实战.part07ibatis实战....
ibatis实战.part09ibatis实战.part09ibatis实战.part09ibatis实战.part09ibatis实战.part09ibatis实战.part09ibatis实战.part09ibatis实战.part09ibatis实战.part09ibatis实战.part09ibatis实战.part09ibatis实战....
ibatis实战.part08ibatis实战.part08ibatis实战.part08ibatis实战.part08ibatis实战.part08ibatis实战.part08ibatis实战.part08ibatis实战.part08ibatis实战.part08ibatis实战.part08ibatis实战.part08ibatis实战....
提供ibatis2.3.4.8.jar包下载.
iBATIS 级联.part3.rariBATIS 级联.part3.rariBATIS 级联.part3.rar