DAO层的函数方法 sql
Public User selectUser(String name,String area);
对应的Mapper.xml app
<select id="selectUser" resultMap="BaseResultMap"> select * from user_user_t where user_name = #{0} and user_area=#{1} </select>
其中,#{0}表明接收的是dao层中的第一个参数,#{1}表明dao层中第二参数,更多参数一致日后加便可。函数
此方法采用Map传多参数.spa
Dao层的函数方法code
Public User selectUser(Map paramMap);
对应的Mapper.xmlxml
<select id=" selectUser" resultMap="BaseResultMap"> select * from user_user_t where user_name = #{userName,jdbcType=VARCHAR} and user_area=#{userArea,jdbcType=VARCHAR} </select>
Service层调用接口
Private User xxxSelectUser(){ Map paramMap=new hashMap(); paramMap.put(“userName”,”对应具体的参数值”); paramMap.put(“userArea”,”对应具体的参数值”); User user=xxx. selectUser(paramMap);}
我的认为此方法不够直观,见到接口方法不能直接的知道要传的参数是什么。hash
Dao层的函数方法class
Public User selectUser(@param(“userName”)Stringname,@param(“userArea”)String area);
对应的Mapper.xmlselect
<select id=" selectUser" resultMap="BaseResultMap"> select * from user_user_t where user_name = #{userName,jdbcType=VARCHAR} and user_area=#{userArea,jdbcType=VARCHAR} </select>