mybatis之parameterType傳遞多個參數

當在查詢的時候需要傳入多個參數的時候該怎么辦呢:

1,封裝成一個Model對象,底層HashMap還是一個

User user=new User();
user.setUserName("zhangsan");
user.setPassword("123456");
queryUserByuserNameAndPass(user);//為返回值類型為User

 

<select id="queryUserByuserNameAndPass"  resultType="User" parameterType="com.j1.User"  >
   <span style="color: #0000ff;">select</span> <span style="color: #808080;">*</span> <span style="color: #0000ff;">from</span> <span style="color: #ff00ff;">user</span> u <span style="color: #0000ff;">where</span> u.<span style="color: #ff00ff;">user_name</span><span style="color: #808080;">=</span>#{userName} <span style="color: #808080;">and</span> u.pass_word<span style="color: #808080;">=</span><span style="color: #000000;">#{passWord}

</select>

 

 

2,使用HashMap封裝

//使用HashMap定義:

HashMap <String,Object> map=new HashMap<String,Object>();
map.put("userName","zhangsan");
map.put("password","123456");
queryUserByuserNameAndPass(map);//為返回值類型為User

 

//sql 如下:

<select id="queryUserByuserNameAndPass"  resultType="User"  parameterType="Map" >
select * from user u where u.user_name=#{userName} and u.pass_word=#{passWord}
</select>

 

3,使用注解,@param

queryUserByuserNameAndPass(@param(''userName")String userName,@param("password")String password)

 

<select id="queryUserByuserNameAndPass"  resultType="User">
select * from user u where u.user_name=#{userName} and u.pass_word=#{passWord}//
</select>

 

 

 

 

 

queryUserByuserNameAndPass(String userName,String PassWord);  //返回值類型為Usre  

 

//sql

<select id="queryUserByuserNameAndPass"  resultType="User">
select * from user u where u.user_name=#{userName} and u.pass_word=#{passWord}//會報錯的
</select>
 

 

改為如下:

<select id="queryUserByuserNameAndPass"  resultType="User">
select * from user u where u.user_name=#{0} and u.pass_word=#{1}//運行成功但是,可讀性不高
</select>
 

 

 

//parameterType 參數類型可以是基本數據類型(int,String,long),可以是Model對象,也可以是Map;

1,基本數據類型:

//java代碼

@Override
public void deleteUserById(Long id) {
SqlSession sqlSession = sqlSessionFactory.openSession(true);
sqlSession.delete("cn.itcast.mybatis.user.deleteUserById", id);
}

 

//sql

<delete id="deleteUserById" parameterType="java.lang.Long">
      DELETE FROM tb_user WHERE id = #{id}
</delete>

 

2,Model對象

//java代碼:

@Override
public void saveUser(User user) {
SqlSession sqlSession = sqlSessionFactory.openSession(true);
sqlSession.insert("cn.itcast.mybatis.user.saveUser", user);
}
@Override
 public void updateUser(User user) {
 SqlSession sqlSession = sqlSessionFactory.openSession(true);
 sqlSession.update("cn.itcast.mybatis.user.updateUser", user);
 }

 

//sql

<update id="updateUser" parameterType="cn.itcast.mybatis.pojo.User">
UPDATE tb_user
SET
password = #{password},
name = #{name},
age = #{age},
sex = #{sex},
birthday = #{birthday},
updated = NOW()
WHERE
id = #{id};
</update>

 

 

3.map

//java

HashMap <String,Object> map=new HashMap<String,Object>();
map.put("userName","zhangsan");
map.put("password","123456");
queryUserByuserNameAndPass(map);//為返回值類型為User

 

//sql 如下:

<select id="queryUserByuserNameAndPass"  resultType="User">
select * from user u where u.user_name=#{userName} and u.pass_word=#{passWord}//
</select>