ibatis3 beta 1 发布，新功能介绍

我接到的主键都是null的，后来自己实现了一个读取主键的方法，能告诉下为啥不能返回主键吗？

ibatis有jstl标签吗？我怎么没见过

ibatis 3是一个全新的版本，几乎是重写，很多地方都精心的设计过，为什么要兼容以前的版本呢，那样只会背上沉重的包袱，就像jdk一样，如果java能像python那样，放下一些包袱，放弃一部分兼容性，那样才能有希望啊。

可以开始写一个Spring的整合了。

在RC版没有出来之前，一切言之过早，目前User Guide中提到的内容和真实版本的API有差异，应该等稳定了再动手。而且SpringSource的动作一向不慢~~

期待出正式版

ibatis 3.0中将DAO Interface给完全真空了。

AuthorMapper.class

public interface AuthorMapper {

	Author selectAuthor(int id);

	void insertAuthor(Author author);

	void updateAuthorIfNecessary(Author author);

}

 

AuthorMapper.xml

<mapper namespace="domain.blog.mappers.AuthorMapper">

  <parameterMap id="selectAuthor" type="domain.blog.Author">
    <parameter property="id"/>
  </parameterMap>
   <!-- id 对应接口中的方法 -->
  <resultMap id="selectAuthor" type="domain.blog.Author">
    <id column="id" property="id"/>
    <result property="username" column="username"/>
    <result property="password" column="password"/>
    <result property="email" column="email"/>
    <result property="bio" column="bio"/>
    <result property="favouriteSection" column="favourite_section"/>
  </resultMap>

  <select id="selectAuthor"
          parameterMap="selectAuthor"
          resultMap="selectAuthor">
    select id, username, password, email, bio, favourite_section
    from author where id = ?
  </select>

  <insert id="insertAuthor"
          parameterType="domain.blog.Author">
    insert into Author (id,username,password,email,bio)
    values (#{id},#{username},#{password},#{email},#{bio})
  </insert>

  <update id="updateAuthorIfNecessary"
          parameterType="domain.blog.Author">
    update Author
      <set>
        <if test="username != null">username=#{username},</if>
        <if test="password != null">password=#{password},</if>
        <if test="email != null">email=#{email},</if>
        <if test="bio != null">bio=#{bio}</if>
      </set>
    where id=#{id}
  </update>
</mapper>

   Client:

  

public class SimpleSqlSessionTest {
	private static SqlSessionFactory sqlMapper;

	@Before
	public void setUp() throws Exception {
		final String resource = "org/apache/ibatis/builder/MapperConfig.xml";
		final Reader reader = Resources.getResourceAsReader(resource);
		sqlMapper = new SqlSessionFactoryBuilder().build(reader);
	}

	@Test
	public void shouldSelectOneAuthor() throws Exception {
		SqlSession session = sqlMapper.openSession();
		try {
			Author author = (Author) session.selectOne( "domain.blog.mappers.AuthorMapper.selectAuthor",
					new Author(101));
			assertEquals(101, author.getId());
			assertEquals(Section.NEWS, author.getFavouriteSection());
		} finally {
			session.close();
		}
	}

	@Test
	public void shouldUpdateAuthorIfNecessary() throws Exception {
		SqlSession session = sqlMapper.openSession();
		Author original;
		Author updated;
		try {
			original = (Author) session.selectOne( "domain.blog.mappers.AuthorMapper.selectAuthor", 101);
			original.setEmail("new@email.com");
			original.setBio(null);
			session.update( "domain.blog.mappers.AuthorMapper.updateAuthorIfNecessary", original);

			updated = (Author) session.selectOne( "domain.blog.mappers.AuthorMapper.selectAuthor", 101);
			assertEquals(original.getEmail(), updated.getEmail());
			session.commit();
		} finally {
			session.close();
		}
		
		try {
			session = sqlMapper.openSession();
			updated = (Author) session.selectOne( "domain.blog.mappers.AuthorMapper.selectAuthor", 101);
			assertEquals(original.getEmail(), updated.getEmail());
		} finally {
			session.close();
		}
	}
}

 

 

至于anotations完全是画蛇添足，华而不实。

什么好东西用滥了都不好了，anotation在有的地方使用还是方便的。

动态SQL增强了
期待它的的稳定

弱弱的问下，如果 "".equals(title)类似这样的如何判断，或者num>10这样的条件如何来写呢？
如此来写吗？
<when test=”title != ‘’ ”> 
      AND title like ${title} 
</when> 

<when test=”num>10 ”> 
      AND title like ${title} 
</when> 

Spring还没有发布对其新版本的整合，com.ibatis.sqlmap.client.SqlMapClient这个文件不知道在新版本中哪个jar中，貌似新版本中没有找到该类。