Mybatis

1. mybatis-config.xml

2.pojo

  
    
      
      
      
      
      
      
      
      
      
      
    
  
  
    id, username, password, email, phone, question, answer, role, create_time, update_time
  
  
    select 
    
    from mmall_user
    where id = #{id,jdbcType=INTEGER}
  
  
    delete from mmall_user
    where id = #{id,jdbcType=INTEGER}
  
  
    insert into mmall_user (id, username, password, 
      email, phone, question, 
      answer, role, create_time, 
      update_time)
    values (#{id,jdbcType=INTEGER}, #{username,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR}, 
      #{email,jdbcType=VARCHAR}, #{phone,jdbcType=VARCHAR}, #{question,jdbcType=VARCHAR}, 
      #{answer,jdbcType=VARCHAR}, #{role,jdbcType=INTEGER}, now(),
      now())
  
  
    insert into mmall_user
    
      
        id,
      
      
        username,
      
      
        password,
      
      
        email,
      
      
        phone,
      
      
        question,
      
      
        answer,
      
      
        role,
      
      
        create_time,
      
      
        update_time,
      
    
    
      
        #{id,jdbcType=INTEGER},
      
      
        #{username,jdbcType=VARCHAR},
      
      
        #{password,jdbcType=VARCHAR},
      
      
        #{email,jdbcType=VARCHAR},
      
      
        #{phone,jdbcType=VARCHAR},
      
      
        #{question,jdbcType=VARCHAR},
      
      
        #{answer,jdbcType=VARCHAR},
      
      
        #{role,jdbcType=INTEGER},
      
      
        now(),
      
      
        now(),
      
    
  
  
    update mmall_user
    
      
        username = #{username,jdbcType=VARCHAR},
      
      
        password = #{password,jdbcType=VARCHAR},
      
      
        email = #{email,jdbcType=VARCHAR},
      
      
        phone = #{phone,jdbcType=VARCHAR},
      
      
        question = #{question,jdbcType=VARCHAR},
      
      
        answer = #{answer,jdbcType=VARCHAR},
      
      
        role = #{role,jdbcType=INTEGER},
      
      
        create_time = #{createTime,jdbcType=TIMESTAMP},
      
      
        update_time = now(),
      
    
    where id = #{id,jdbcType=INTEGER}
  
  
    update mmall_user
    set username = #{username,jdbcType=VARCHAR},
      password = #{password,jdbcType=VARCHAR},
      email = #{email,jdbcType=VARCHAR},
      phone = #{phone,jdbcType=VARCHAR},
      question = #{question,jdbcType=VARCHAR},
      answer = #{answer,jdbcType=VARCHAR},
      role = #{role,jdbcType=INTEGER},
      create_time = #{createTime,jdbcType=TIMESTAMP},
      update_time = now()
    where id = #{id,jdbcType=INTEGER}
  
  
  
  
    select count(1) from mmall_user
    where username = #{username}
  

  
    select count(1) from mmall_user
    where email = #{email}
  


  
    SELECT
--     *???//这样真的好么?答案就是,这样不好.
    
    from mmall_user
    where username = #{username}
    and password = #{password}
  


  
    select
    question
    from mmall_user
    where username = #{username}
  

  
    SELECT
    count(1)
    from mmall_user
    where username=#{username}
    and question = #{question}
    and answer = #{answer}
  

  
    update mmall_user
    SET password = #{passwordNew},update_time = now()
    where username = #{username}
  

  
    SELECT
    count(1)
    from mmall_user
    where password = #{password}
    and id = #{userId}
  


  
    select count(1) from mmall_user
    where email = #{email}
    and id != #{userId}
  

3. 接口

package com.love.lee.dao;


import com.love.lee.pojo.User;
import org.apache.ibatis.annotations.Param;

public interface UserMapper {
    int deleteByPrimaryKey(Integer id);

    int insert(User record);

    int insertSelective(User record);

    User selectByPrimaryKey(Integer id);

    int updateByPrimaryKeySelective(User record);

    int updateByPrimaryKey(User record);

    int checkUsername(String username);

    int checkEmail(String email);

    User selectLogin(@Param("username") String username, @Param("password") String password);

    String selectQuestionByUsername(String username);

    int checkAnswer(@Param("username") String username, @Param("question") String question, @Param("answer") String answer);

    int updatePasswordByUsername(@Param("username") String username, @Param("passwordNew") String passwordNew);

    int checkPassword(@Param(value = "password") String password, @Param("userId") Integer userId);

    int checkEmailByUserId(@Param(value = "email") String email, @Param(value = "userId") Integer userId);
}

4.调用

Reader reader = Resources.getResourceAsReader("mybatis-config.xml");

        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);

        SqlSession sqlSession = sqlSessionFactory.openSession();


 try {
            sqlSession = dao.getSqlSession();
            UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
            User user = userMapper.selectByPrimaryKey(1);
            System.out.println(user.toString());

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (sqlSession != null) {
                sqlSession.close();
            }
        }