mybatis- pass multiple parameters

The first embodiment: the subscript parameter passing

DAO layer function method

Public User selectUser(String name, String area);

Corresponding Mapper.xml

<select id="selectUser" resultMap="BaseResultMap"> 
    select * from user where name = #{0} and area = #{1} 
</select> 

Description: Parameter Type can not write, # {0} is the first representative of the received parameter dao layer, # {1} represents a second parameter dao layer, subsequent parameters press so marked.

---

 

The second embodiment: map Package

DAO layer function method

Public User selectUser(Map<String, Object> paramMap);

Corresponding Mapper.xml

<select id="selectUser" parameterType="java.util.Map" resultMap="BaseResultMap"> 
　　select * from user where name = #{name，jdbcType=VARCHAR} and area = #{area, jdbcType=VARCHAR} 
</select>

service layer calls

Map<String, Object> paramMap = new hashMap(); 
paramMap.put ( "name", "parameter value" );
paramMap.put ( "Area", "parameter value" );
User user = userDao.selectUser(paramMap);

---

 

The third scheme: use annotations @param

DAO layer function method

Public User selectUser(@param("name")String userName, @param("area")String userArea);

Corresponding Mapper.xml 

<select id=" selectUser" resultMap="BaseResultMap"> 
   select * from user where name = #{userName，jdbcType=VARCHAR} and area=#{userArea, jdbcType=VARCHAR} 
</select>

Description: In the few parameters, the recommended third embodiment, more intuitive.