本章主要讲解几种批量处理的用法及对别，批量处理一般用法包含以下几种：

1）普通foreach处理（没循环一次执行一次与mysql服务器交互操作），实际上也是采用的ExecutorType.SIMPLE；

2）使用ExecutorType.BATCH批量处理方法；

3）拼接SQL，一次批量提交给Mysql多个插入语句到mysql服务器端，执行批量操作。

下边针对这几种方案分别进行示例展示用法，以及优缺点对比。

新建maven项目具体工作参考：《MyBatis(九)：Mybatis Java API批量操作（增、删、改、查）》
在spring-config.xml中添加sqlSessionTemplate bean:

   <bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">

       <constructor-arg index="0" ref="sqlSessionFactory" />

       <!--<constructor-arg index="1" value="BATCH" />-->

   </bean>

新建测试类：com.dx.test.TestBatchInsert.java

import java.util.ArrayList;

import java.util.Date;

import java.util.List;

import java.util.Random;

import org.apache.ibatis.session.ExecutorType;

import org.apache.ibatis.session.SqlSession;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.mybatis.spring.SqlSessionTemplate;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.test.context.ContextConfiguration;

import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.dx.test.mapper.ArticleCategoryMapper;

import com.dx.test.model.ArticleCategory;

import com.dx.test.model.enums.DataStatus;

@RunWith(SpringJUnit4ClassRunner.class)

@ContextConfiguration({ "classpath:spring-config.xml" })

public class TestBatchInsert {

   @Autowired

   private SqlSessionTemplate sqlSessionTemplate; // 引入注入的sqlSessionTemplate bean实例

   @Autowired

   private ArticleCategoryMapper articleCategoryMapper; // 参考上篇文章该类的定义。

}

mybatis 批量处理测试：

方案1）采用mybatis foreach循环插入方案：

   @Test

   public void testWithSimple() {

      long start = System.currentTimeMillis();

      SqlSession sqlSession = sqlSessionTemplate.getSqlSessionFactory().openSession(ExecutorType.SIMPLE, false);

      ArticleCategoryMapper articleCategoryMapper=sqlSession.getMapper(ArticleCategoryMapper.class);

      List<ArticleCategory> list = new ArrayList<>();

      for (int i = 0; i < 10000; i++) {

         ArticleCategory articleCategory = new ArticleCategory();

         articleCategory.setTitle("title_" + new Random().nextInt(1000) + "_" + new Random().nextInt(1000));

         articleCategory.setDescription("category description");

         articleCategory.setImgSrc("http://www.test.com/img/category/img-" + new Random().nextInt(1000) + ".gif");

         articleCategory.setState(DataStatus.Living);

         articleCategory.setCreateTime(new Date());

         articleCategory.setCreateUser("create user");

         articleCategory.setCreateUserId("user-" + new Random().nextInt(1000));

         articleCategoryMapper.insert(articleCategory);

      }

      sqlSession.commit();

      sqlSession.clearCache();

      sqlSession.close();

      long stop = System.currentTimeMillis();

      System.out.println("testWithExecutorType.SIMPLE:" + (stop - start) + "ms");

   }

执行该测试方法：

==>  Preparing: INSERT INTO article_category (title, img_src, description, state, create_user, create_user_id, create_time, update_user, update_user_id, update_time, version) VALUES (?, ?, ?, ?, ?, ?, now(), ?, ?, now(), 0)

==> Parameters: title_159_754(String), http://www.test.com/img/category/img-606.gif(String), category description(String), 0(Integer), create user(String), user-740(String), null, null

<==    Updates: 1

。。。

==>  Preparing: INSERT INTO article_category (title, img_src, description, state, create_user, create_user_id, create_time, update_user, update_user_id, update_time, version) VALUES (?, ?, ?, ?, ?, ?, now(), ?, ?, now(), 0)

==> Parameters: title_416_561(String), http://www.test.com/img/category/img-72.gif(String), category description(String), 0(Integer), create user(String), user-98(String), null, null

<==    Updates: 1

==>  Preparing: INSERT INTO article_category (title, img_src, description, state, create_user, create_user_id, create_time, update_user, update_user_id, update_time, version) VALUES (?, ?, ?, ?, ?, ?, now(), ?, ?, now(), 0)

==> Parameters: title_967_656(String), http://www.test.com/img/category/img-897.gif(String), category description(String), 0(Integer), create user(String), user-620(String), null, null

<==    Updates: 1

==>  Preparing: INSERT INTO article_category (title, img_src, description, state, create_user, create_user_id, create_time, update_user, update_user_id, update_time, version) VALUES (?, ?, ?, ?, ?, ?, now(), ?, ?, now(), 0)

==> Parameters: title_399_676(String), http://www.test.com/img/category/img-819.gif(String), category description(String), 0(Integer), create user(String), user-889(String), null, null

<==    Updates: 1

testWithExecutorType.SIMPLE::8163ms

测试结果发现耗时为：8163ms，而且从打印日志，可以看出该类执行是一条一条的插入的，而且每次插入前都要Preparing插入sql，这个是比较耗时的。

方案2）采用mybatis batch方案（使用ExecutorType.BATCH）：

   @Test

   public void testWithBatch() {

      long start = System.currentTimeMillis();

      SqlSession sqlSession = sqlSessionTemplate.getSqlSessionFactory().openSession(ExecutorType.BATCH, false);

      ArticleCategoryMapper articleCategoryMapper=sqlSession.getMapper(ArticleCategoryMapper.class);

      List<ArticleCategory> list = new ArrayList<>();

      for (int i = 0; i < 10000; i++) {

         ArticleCategory articleCategory = new ArticleCategory();

         articleCategory.setTitle("title_" + new Random().nextInt(1000) + "_" + new Random().nextInt(1000));

         articleCategory.setDescription("category description");

         articleCategory.setImgSrc("http://www.test.com/img/category/img-" + new Random().nextInt(1000) + ".gif");

         articleCategory.setState(DataStatus.Living);

         articleCategory.setCreateTime(new Date());

         articleCategory.setCreateUser("create user");

         articleCategory.setCreateUserId("user-" + new Random().nextInt(1000));

         articleCategoryMapper.insert(articleCategory);

      }

      sqlSession.commit();

      sqlSession.clearCache();

      sqlSession.close();

      long stop = System.currentTimeMillis();

      System.out.println("testWithExecutorType.BATCH:" + (stop - start) + "ms");

   }

执行该测试方法：

==>  Preparing: INSERT INTO article_category (title, img_src, description, state, create_user, create_user_id, create_time, update_user, update_user_id, update_time, version) VALUES (?, ?, ?, ?, ?, ?, now(), ?, ?, now(), 0)

==> Parameters: title_345_236(String), http://www.test.com/img/category/img-688.gif(String), category description(String), 0(Integer), create user(String), user-337(String), null, null

。。。

==> Parameters: title_534_211(String), http://www.test.com/img/category/img-572.gif(String), category description(String), 0(Integer), create user(String), user-139(String), null, null

==> Parameters: title_292_271(String), http://www.test.com/img/category/img-8.gif(String), category description(String), 0(Integer), create user(String), user-547(String), null, null

testWithExecutorType.BATCH:5283ms

测试结果发现耗时为：5283ms，而且从打印日志可以看出该方案只一致性一次预编译，之后插入都不需要再次预编译。

方案3）采用拼接SQL方案：

用法1：

   @Test

   public void testWithBatchScript() {

      long start = System.currentTimeMillis();

      List<ArticleCategory> list = new ArrayList<>();

      for (int i = 0; i < 10000; i++) {

         ArticleCategory articleCategory = new ArticleCategory();

         articleCategory.setTitle("title_" + new Random().nextInt(1000) + "_" + new Random().nextInt(1000));

         articleCategory.setDescription("category description");

         articleCategory.setImgSrc("http://www.test.com/img/category/img-" + new Random().nextInt(1000) + ".gif");

         articleCategory.setState(DataStatus.Living);

         articleCategory.setCreateTime(new Date());

         articleCategory.setCreateUser("create user");

         articleCategory.setCreateUserId("user-" + new Random().nextInt(1000));

         list.add(articleCategory);

      }

      articleCategoryMapper.batchInsertsWithScript(list);

      long stop = System.currentTimeMillis();

      System.out.println("testWithBatchScript:" + (stop - start) + "ms");

   }

该方法执行日志：

JDBC Connection [com.alibaba.druid.proxy.jdbc.ConnectionProxyImpl@1b84f475] will not be managed by Spring

==>  Preparing: INSERT INTO `article_category` (`title`,`img_src`,`description`,`state`,`create_time`,`create_user`,`create_user_id`,`update_time`,`update_user`,`update_user_id`,`version`)

VALUES (?,?,?,?,now(),?,?,now(),?,?,0) ,

。。。

(?,?,?,?,now(),?,?,now(),?,?,0) ,

(?,?,?,?,now(),?,?,now(),?,?,0)

ON DUPLICATE KEY UPDATE `update_time` = now()

==> Parameters:

title_375_245(String), http://www.test.com/img/category/img-247.gif(String), category description(String), 0(Integer), create user(String), user-930(String), null, null,

。。。

title_275_39(String), http://www.test.com/img/category/img-875.gif(String), category description(String), 0(Integer), create user(String), user-323(String), null, null,

title_743_735(String), http://www.test.com/img/category/img-220.gif(String), category description(String), 0(Integer), create user(String), user-917(String), null, null

<==    Updates: 10000

Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@65b104b9]

testWithBatchScript:3312ms

测试2：

   @Test

   public void testWithBatchSQL() {

      long start = System.currentTimeMillis();

      List<ArticleCategory> list = new ArrayList<>();

      for (int i = 0; i < 10000; i++) {

         ArticleCategory articleCategory = new ArticleCategory();

         articleCategory.setTitle("title_" + new Random().nextInt(1000) + "_" + new Random().nextInt(1000));

         articleCategory.setDescription("category description");

         articleCategory.setImgSrc("http://www.test.com/img/category/img-" + new Random().nextInt(1000) + ".gif");

         articleCategory.setState(DataStatus.Living);

         articleCategory.setCreateTime(new Date());

         articleCategory.setCreateUser("create user");

         articleCategory.setCreateUserId("user-" + new Random().nextInt(1000));

         list.add(articleCategory);

      }

      articleCategoryMapper.batchInserts(list);

      long stop = System.currentTimeMillis();

      System.out.println("testWithBatchSQL:" + (stop - start) + "ms");

   }

执行该方法打印日志：

Creating a new SqlSession

SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@65b104b9] was not registered for synchronization because synchronization is not active

JDBC Connection [com.alibaba.druid.proxy.jdbc.ConnectionProxyImpl@31ff43be] will not be managed by Spring

==>  Preparing: INSERT INTO `article_category`(`title`,`img_src`,`description`,`state`,`create_time`,`create_user`,`create_user_id`,`update_time`,`update_user`,`update_user_id`,`version`)

VALUES(?,?,?,?,now(),?,?,now(),?,?,0),

。。。

(?,?,?,?,now(),?,?,now(),?,?,0),

(?,?,?,?,now(),?,?,now(),?,?,0)

ON DUPLICATE KEY UPDATE `update_time` = now();

==> Parameters: title_131_603(String), http://www.test.com/img/category/img-831.gif(String), category description(String), 0(Integer), create user(String), user-35(String), null, null,

。。。

title_317_725(String), http://www.test.com/img/category/img-208.gif(String), category description(String), 0(Integer), create user(String), user-968(String), null, null,

title_403_241(String), http://www.test.com/img/category/img-870.gif(String), category description(String), 0(Integer), create user(String), user-483(String), null, null

<==    Updates: 10000

Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@65b104b9]

testWithBatchSQL:2978ms

上边这两种方法实际上原理相同：拼接SQL，一次提交一批SQL方案。

拼接SQL一次提交方案缺点：当拼接sql超出’max_allowed_packet‘设置大小时，会抛出异常：

com.mysql.jdbc.PacketTooBigException: Packet for query is too large (8346602 > 4194304（4M）). You can change this value on the server by setting the max_allowed_packet’ variable.

备注：
SqlServer 对语句的条数和参数的数量都有限制，分别是 1000 和 2100。
Mysql 对语句的长度有限制，默认是 4M。
Mybatis 对动态语句没有数量上的限制。

解决错误方案：

我安装的mysql版本是：8.0.17 MySQL Community Server - GPL

dx:~ $ mysql -uroot -p123456 -h127.0.0.1

mysql: [Warning] Using a password on the command line interface can be insecure.

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 356

Server version: 8.0.17 MySQL Community Server - GPL

Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

该版本的mysql允许的发送给服务器的最大数据包大小情况如下：

ysql> show variables like '%packet%';

+---------------------------+------------+

| Variable_name             | Value      |

+---------------------------+------------+

| max_allowed_packet        | 67108864   |

| mysqlx_max_allowed_packet | 67108864   |

| slave_max_allowed_packet  | 1073741824 |

+---------------------------+------------+

3 rows in set (0.00 sec)

ax_allowed_packet 设置以字节发送给服务器的最大数据包大小. (默认: 64MB)，
数据库变更需要：大的插入和更新可能会被max_allowed_packet参数限制，导致失败。
此时，解决方案：
1）在mysql中执行：set global max_allowed_paclet = 128*1024*1024；
2）修改mysql服务器的配置(my.ini 或者 my.cnf 文件)参数： max_allowed_packet = 128M 来解决，
3）需要重启mysql服务器（缺陷）。

备注：

上边‘mysqlx_max_allowed_packet’参数时mysqlx插件的配置参数，起作用针对mysqlx起作用，作用于 max_allowed_packet 相同。

mysql> show plugins;

+---------------------------------+----------+--------------------+---------+---------+

| Name                            | Status   | Type               | Library | License |

+---------------------------------+----------+--------------------+---------+---------+

| binlog                          | ACTIVE   | STORAGE ENGINE     | NULL    | GPL     |

| mysql_native_password           | ACTIVE   | AUTHENTICATION     | NULL    | GPL     |

| sha256_password                 | ACTIVE   | AUTHENTICATION     | NULL    | GPL     |

| caching_sha2_password           | ACTIVE   | AUTHENTICATION     | NULL    | GPL     |

| sha2_cache_cleaner              | ACTIVE   | AUDIT              | NULL    | GPL     |

| CSV                             | ACTIVE   | STORAGE ENGINE     | NULL    | GPL     |

| MEMORY                          | ACTIVE   | STORAGE ENGINE     | NULL    | GPL     |

| InnoDB                          | ACTIVE   | STORAGE ENGINE     | NULL    | GPL     |

...

| mysqlx                          | ACTIVE   | DAEMON             | NULL    | GPL     |

| mysqlx_cache_cleaner            | ACTIVE   | AUDIT              | NULL    | GPL     |

+---------------------------------+----------+--------------------+---------+---------+

44 rows in set (0.01 sec)

性能总结：

+----------------------------------------------+------------+

| 采用方案                                      | 耗时        |

+----------------------------------------------+------------+

| 普通处理方法(ExecutorType.SIMPLE)逐条插入处理    | 8s         |

| 使用ExecutorType.BATCH                        | 5s         |

| 使用拼接SQL,一致性提交一批SQL                    | 3s         |

+-----------------------------------------------+------------+

最新文章

  1. Linux命令【第一篇】
  2. centos 7配置网络 更新yum源
  3. Mac无法写入移动硬盘
  4. 你不知道的Javascript（上卷）读书笔记之一 ---- 作用域
  5. c#如何使用正则表达式ZZ
  6. sencha panel的头header上添加刷新按钮
  7. EF Code-First数据迁移的尝试
  8. c语言入门教程 / c语言入门经典书籍
  9. 将Ftp添加到资源管理器中直接使用
  10. JavaScript网站设计实践（六）编写live.html页面 改进表格显示
  11. HTML5之一HTML5简介
  12. Python字符串连接的5种方法
  13. SpringMVC04controller中定义多个方法
  14. LeetCode_Longest Palindromic Substring
  15. asp.net 生成、解析条形码和二维码
  16. web前端学习笔记
  17. Java经典案例之-“统计英文字母、空格、数字和其它字符的个数”
  18. UnicodeEncodeError: &#39;gbk&#39; codec can&#39;t encode character &#39;\xa0&#39; in position 1987: illegal multibyte sequence
  19. 有趣的toggleClass实现交替样式
  20. 【linux基础】如何确定系统使用的Eigen库的版本

热门文章

  1. JavaScript设计模式与开发实践随笔（二）
  2. 英语rubyspinel红尖晶石rubyspinel单词
  3. Sping注解开发
  4. android studio学习----构建编译
  5. 【优化】COUNT(1)、COUNT(*)、COUNT(常量)、COUNT(主键)、COUNT(ROWID)、COUNT(非空列)、COUNT(允许为空列)、COUNT(DISTINCT 列名)
  6. python之路第五天
  7. ML-软间隔(slack)的 SVM
  8. .DS_Store文件是什么？Mac系统如何彻底清除该文件？
  9. PAT甲级1018留坑——第一个测试点未过（Dijikstar+Dfs）
  10. wordpress如何防止url被篡改