MyBatis&MyBatisPlus实现批量插入

批量插入会导致系统cpu和磁盘飙升，设置合理的连接池和数据库的参数，增加MySQL数据库缓冲区大小，减少索引，以获得更好的性能。

单条最大sql为4M，可以修改设置：

-- 设置最大执行 SQL 为 10M
set global max_allowed_packet=10*1024*1024;

经测试批处理每5000一次十几秒全部插入。

mybatis-plus示例代码

引入pom坐标

    com.baomidou
    mybatisplus-spring-boot-starter
    1.0.5

业务层 

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.demo.mapper.UserMapper;
import com.example.demo.model.User;
import com.example.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;

@Service
public class UserServiceImpl extends ServiceImpl
        implements UserService {

    @Autowired
    private UserMapper userMapper;

    public boolean saveBatchCustom(List list){
        return userMapper.saveBatchCustom(list);
    }
}

 持久层

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.example.demo.model.User;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

@Mapper
public interface UserMapper extends BaseMapper{

    boolean saveBatchCustom(List list);
}

import com.example.demo.model.User;
import com.example.demo.service.impl.UserServiceImpl;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.ArrayList;
import java.util.List;

@SpringBootTest
class UserControllerTest {

    // 最大循环次数
    private static final int MAXCOUNT = 100000;

    @Autowired
    private UserServiceImpl userService;

    /**
     * MP 批量插入
     */
    @Test
    void saveBatch() {
        long stime = System.currentTimeMillis(); // 统计开始时间
        List list = new ArrayList<>();
        for (int i = 0; i < MAXCOUNT; i++) {
            User user = new User();
            user.setName("test:" + i);
            user.setPassword("123456");
            list.add(user);
        }
        // MP 批量插入
        userService.saveBatch(list);
        long etime = System.currentTimeMillis(); // 统计结束时间
        System.out.println("执行时间：" + (etime - stime));
    }
}

原理是把整个数据按照最大1000等分，依次再插入 

mybatis示例代码

public void testBatchInsertUser() throws IOException {
    InputStream resourceAsStream =
            Resources.getResourceAsStream("sqlMapConfig.xml");
    SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(resourceAsStream);
    SqlSession session = sqlSessionFactory.openSession();
    System.out.println("===== 开始插入数据 =====");
    long startTime = System.currentTimeMillis();
    int waitTime = 10;
    try {
        List userList = new ArrayList<>();
        for (int i = 1; i <= 300000; i++) {
            User user = new User();
            user.setId(i);
            user.setUsername("共饮一杯无 " + i);
            user.setAge((int) (Math.random() * 100));
            userList.add(user);
            if (i % 1000 == 0) {
                session.insert("batchInsertUser", userList);
                // 每 1000 条数据提交一次事务
                session.commit();
                userList.clear();
            }
        }
        // 最后插入剩余的数据
        if(!CollectionUtils.isEmpty(userList)) {
            session.insert("batchInsertUser", userList);
            session.commit();
        }

        long spendTime = System.currentTimeMillis()-startTime;
        System.out.println("成功插入 30 万条数据,耗时："+spendTime+"毫秒");
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        session.close();
    }
}

 jdbc示例代码

public void testJDBCBatchInsertUser() throws IOException {
    Connection connection = null;
    PreparedStatement preparedStatement = null;

    String databaseURL = "jdbc:mysql://localhost:3306/test";
    String user = "root";
    String password = "root";

    try {
        connection = DriverManager.getConnection(databaseURL, user, password);
        // 关闭自动提交事务，改为手动提交
        connection.setAutoCommit(false);
        System.out.println("===== 开始插入数据 =====");
        long startTime = System.currentTimeMillis();
        String sqlInsert = "INSERT INTO t_user ( username, age) VALUES ( ?, ?)";
        preparedStatement = connection.prepareStatement(sqlInsert);

        Random random = new Random();
        for (int i = 1; i <= 300000; i++) {
            preparedStatement.setString(1, "共饮一杯无 " + i);
            preparedStatement.setInt(2, random.nextInt(100));
            // 添加到批处理中
            preparedStatement.addBatch();

            if (i % 1000 == 0) {
                // 每1000条数据提交一次
                preparedStatement.executeBatch();
                connection.commit();
                System.out.println("成功插入第 "+ i+" 条数据");
            }

        }
        // 处理剩余的数据
        preparedStatement.executeBatch();
        connection.commit();
        long spendTime = System.currentTimeMillis()-startTime;
        System.out.println("成功插入 30 万条数据,耗时："+spendTime+"毫秒");
    } catch (SQLException e) {
        System.out.println("Error: " + e.getMessage());
    } finally {
        if (preparedStatement != null) {
            try {
                preparedStatement.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        if (connection != null) {
            try {
                connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}

清空表数据 

TRUNCATE TABLE  表名; //清空MySQL表所有数据