Mybatis数据基本操作

<insert id="doCreate" parameterType="News"><!--添加数据-->
        INSERT INTO news(title,content) VALUES (#{title},#{content}) ;
        <selectKey keyColumn="nid" keyProperty="nid" order="AFTER" resultType="java.lang.Long">
            SELECT LAST_INSERT_ID()
        </selectKey>
    </insert>
    <update id="doEdit" parameterType="News"> <!--更新数据-->
            UPDATE  news SET title=#{title},content=#{content} WHERE nid=#{nid}
        </update>
    <delete id="doRemove" parameterType="java.lang.Long"><!--删除数据-->
            DELETE  FROM news WHERE nid=#{xiaoyu}
        </delete>

查询数据（添加到News.xml）

  <select id="findById" parameterType="java.lang.Long" resultType="News"><查询数据>
        SELECT nid,title,content FROM news WHERE nid=#{wodenid} ;
    </select>
    <select id="findAll" resultType="News">
        SELECT nid,title,content FROM news ;
    </select>
    <select id="findAllTitle" resultType="News">
        SELECT nid,title FROM news ;
    </select>
    <select id="findSplit" resultType="News" parameterType="java.util.Map"> <分页查询>
        SELECT nid,title,content FROM news WHERE ${column} LIKE #{keyword} LIMIT #{start},#{lineSize} ;
    </select>
    <select id="getAllCount" resultType="java.lang.Long">
        SELECT COUNT(*) FROM news ;
    </select>

数据更新测试

     @Test
     public void testDelete() throws Exception {   //删除
         System.out.println("数据删除：" + MyBatisSessionFactory.getSession()
                 .update("com.lion.mapper.NewsNS.doRemove", 9L));
         MyBatisSessionFactory.getSession().commit();
         MyBatisSessionFactory.close();
     }
     @Test
     public void testEdit() throws Exception {              //修改
         News vo = new News();
         vo.setTitle("人生最舒服的日子？");
         vo.setContent("你是个屌丝，梦里成为富翁");
         vo.setNid(9L); // 修改数据时需要设置准确的编号
         System.out.println("数据修改：" + MyBatisSessionFactory.getSession().update("com.lion.mapper.NewsNS.doEdit", vo));
         MyBatisSessionFactory.getSession().commit();
         MyBatisSessionFactory.close();
         MyBatisSessionFactory.getSession().commit();
         MyBatisSessionFactory.close();
     }
     @Test
     public void testSplit() throws Exception {    //分页查询
         Map<String,Object> splitParams = new HashMap<String,Object>() ; // 保存分页相关参数
         splitParams.put("column", "title");
         splitParams.put("keyword", "%%");
         splitParams.put("start", 5); // (currentPage - 1) * lineSize
         splitParams.put("lineSize", 5);
         List<News> all = MyBatisSessionFactory.getSession().selectList("com.lion.mapper.NewsNS.findSplit",splitParams);
         Long count = MyBatisSessionFactory.getSession().selectOne("com.lion.mapper.NewsNS.getAllCount",splitParams);
         System.out.println("【分页数据】" + all);
         System.out.println("【数据行统计】" + count);
         MyBatisSessionFactory.close();
     }