mybatis 批量添加_java批量导入大量数据

1.for循环insert

 long start = System.currentTimeMillis();
    for(int i = 0 ;i < 100000; i++) { 
   
        User user = new User();
        user.setId("id" + i);
        user.setName("name" + i);
        user.setPassword("password" + i);
        userMapper.insert(user);
    }
    long end = System.currentTimeMillis();
    System.out.println("---------------" + (start - end) + "---------------");

    <insert id="insert">
      INSERT INTO t_user (id, name, password)
          VALUES(#{id}, #{name}, #{password})
    </insert>

时间为380826ms

2.Mybatis batch模式

  SqlSession sqlSession = sqlSessionTemplate.getSqlSessionFactory().openSession(ExecutorType.BATCH, false);//跟上述sql区别
        UserMapper userMapper = sqlSession.getMapper(UserMapper.class);

        long start = System.currentTimeMillis();
        for (int i = 0; i < 100000; i++) { 
   
            User user = new User();
            user.setId("id" + i);
            user.setName("name" + i);
            user.setPassword("password" + i);
            userMapper.insert(user);
        }
        sqlSession.commit();
        long end = System.currentTimeMillis();
        System.out.println("---------------" + (start - end) + "---------------");

   <insert id="insert">
      INSERT INTO t_user (id, name, password)
          VALUES(#{id}, #{name}, #{password})
    </insert>

时间为203660ms

3.批量foreach插入

   long start = System.currentTimeMillis();
        List<User> userList = new ArrayList<>();
        for (int i = 0; i < 100000; i++) { 
   
            User user = new User();
            user.setId("id" + i);
            user.setName("name" + i);
            user.setPassword("password" + i);
            userList .add(user);
        }
        userMapper.insertBatch(userList);
        long end = System.currentTimeMillis();
        System.out.println("---------------" + (start - end) + "---------------");

<insert id="insertBatch" parameterType="java.util.List">
        INSERT INTO t_user
        (id, name, password)
        VALUES
        <foreach collection ="userList" item="user" separator =",">
            (#{user.id}, #{user.name}, #{user.password})
        </foreach >
</insert>

时间为8706ms

插入三种方式，文章参考：https://segmentfault.com/a/1190000021290975?utm_source=tag-newest

如果批量增加数据量较多时 建议采用batch模式，foreach一次性插入数据量建议10-100条，for循环是最不建议的方式，需要频繁的建立关闭数据库连接，比较耗时。

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