Mybatis传值三种方法

Posted 2020-10-30 Talk is cheap. Show me the cod

一、参数索引方式

Dao层

2 Public User selectUser(String name,String area);

对应XML文件

1 <select id="selectUser" resultMap="BaseResultMap">
2     select  *  from user_user_t   where user_name = #{0} and user_area=#{1}
3 </select>

二、使用Map传递多参数

Dao层

1 Public User selectUser(Map paramMap);

对应xml文件

1 <select id=" selectUser" resultMap="BaseResultMap">
2    select  *  from user_user_t   where user_name = #{userName，jdbcType=VARCHAR} and user_area=#{userArea,jdbcType=VARCHAR}
3 </select>

Service层调用

1 Private User xxxSelectUser(){
2 Map paramMap=new hashMap();
3 paramMap.put(“userName”,”对应具体的参数值”);
4 paramMap.put(“userArea”,”对应具体的参数值”);
5 User user=xxx. selectUser(paramMap);}

三、注解

Dao层

Public User selectUser(@param(“userName”)Stringname,@param(“userArea”)String area);

对应XML文件

1 <select id=" selectUser" resultMap="BaseResultMap">
2    select  *  from user_user_t   where user_name = #{userName，jdbcType=VARCHAR} and user_area=#{userArea,jdbcType=VARCHAR}
3 </select>