mybatis之parameterType传递多个参数

当在查询的时候需要传入多个参数的时候该怎么办呢:

1,封装成一个Model对象,底层HashMap还是一个

User user=new User();
user.setUserName("zhangsan");
user.setPassword("123456");
queryUserByuserNameAndPass(user);//为返回值类型为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封装

//使用HashMap定义:

HashMap <String,Object> map=new HashMap<String,Object>();
map.put("userName","zhangsan");
map.put("password","123456");
queryUserByuserNameAndPass(map);//为返回值类型为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);  //返回值类型为Usre  

//sql

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

改为如下:

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

//parameterType 参数类型可以是基本数据类型(int,String,long),可以是Model对象,也可以是Map;

1,基本数据类型:

//java代码

@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对象

//java代码:

@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);//为返回值类型为User

//sql 如下:

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