mybati之parameterType传递多个参数
mybati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:
3,使用注解,@param
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" >
- select * from user u where u.user_name=#{userName} and u.pass_word=#{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>
- <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:
- @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>
