一：预备工作

1：pom依赖：

mysqlmysql-connector-javaruntime

org.mybatis.spring.bootmybatis-spring-boot-starter2.2.2

com.baomidoumybatis-plus-boot-starter3.5.2
org.projectlomboklomboktrue

2：配置yml文件

server:port: 8080spring:datasource:username: mysql用户名password: mysql密码url: jdbc:mysql://localhost:3306/数据库名字?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=UTCdriver-class-name: com.mysql.cj.jdbc.Drivermybatis:mapper-locations: classpath:mapping/*.xml

3：公用的User类：

@Data
public class User {private int id;private String username;private String password;
}

二、不同的实现方法

1：MyBatis利用For循环批量插入

（1）、编写UserService服务类，测试一万条数据耗时情况

@Service
public class UserService {@Resourceprivate UserMapper userMapper;public void InsertUsers(){long start = System.currentTimeMillis();for(int i = 0 ;i < 10000; i++) {User user = new User();user.setUsername("name" + i);user.setPassword("password" + i);userMapper.insertUsers(user);}long end = System.currentTimeMillis();System.out.println("一万条数据总耗时：" + (end-start) + "ms" );}}

（2）、编写UserMapper接口

@Mapper
public interface UserMapper {Integer insertUsers(User user);
}

（3）、编写UserMapper.xml文件

INSERT INTO user (username, password)VALUES(#{username}, #{password})

（4）、进行单元测试

@SpringBootTest
class DemoApplicationTests {@Resourceprivate UserService userService;@Testpublic void insert(){userService.InsertUsers();}}

（5）、结果输出

一万条数据总耗时：26348ms

2：MyBatis的手动批量提交

（1）、其他保持不变，Service层作稍微的变化

@Service
public class UserService {@Resourceprivate UserMapper userMapper;@Resourceprivate SqlSessionTemplate sqlSessionTemplate;public void InsertUsers(){//关闭自动提交SqlSession sqlSession = sqlSessionTemplate.getSqlSessionFactory().openSession(ExecutorType.BATCH, false);UserMapper userMapper = sqlSession.getMapper(UserMapper.class);long start = System.currentTimeMillis();for(int i = 0 ;i < 10000; i++) {User user = new User();user.setUsername("name" + i);user.setPassword("password" + i);userMapper.insertUsers(user);}sqlSession.commit();long end = System.currentTimeMillis();System.out.println("一万条数据总耗时：" + (end-start) + "ms" );}}

（2）、结果输出

一万条数据总耗时：24516ms

3：MyBatis以集合方式批量新增（推荐）

（1）、编写UserService服务类

@Service
public class UserService {@Resourceprivate UserMapper userMapper;public void InsertUsers(){long start = System.currentTimeMillis();List userList = new ArrayList<>();User user;for(int i = 0 ;i < 10000; i++) {user = new User();user.setUsername("name" + i);user.setPassword("password" + i);userList.add(user);}userMapper.insertUsers(userList);long end = System.currentTimeMillis();System.out.println("一万条数据总耗时：" + (end-start) + "ms" );}}

（2）、编写UserMapper接口

@Mapper
public interface UserMapper {Integer insertUsers(List userList);
}

（3）、编写UserMapper.xml文件

INSERT INTO user (username, password)VALUES(#{user.username}, #{user.password})

（4）、输出结果

一万条数据总耗时：521ms

4：MyBatis-Plus提供的SaveBatch方法

（1）、编写UserService服务

@Service
public class UserService extends ServiceImpl implements IService {public void InsertUsers(){long start = System.currentTimeMillis();List userList = new ArrayList<>();User user;for(int i = 0 ;i < 10000; i++) {user = new User();user.setUsername("name" + i);user.setPassword("password" + i);userList.add(user);}saveBatch(userList);long end = System.currentTimeMillis();System.out.println("一万条数据总耗时：" + (end-start) + "ms" );}
}

（2）、编写UserMapper接口

@Mapper
public interface UserMapper extends BaseMapper {}

（3）、单元测试结果

一万条数据总耗时：24674ms

5：MyBatis-Plus提供的InsertBatchSomeColumn方法（推荐）

（1）、编写EasySqlInjector 自定义类

public class EasySqlInjector extends DefaultSqlInjector {@Overridepublic List getMethodList(Class mapperClass, TableInfo tableInfo) {// 注意：此SQL注入器继承了DefaultSqlInjector(默认注入器)，调用了DefaultSqlInjector的getMethodList方法，保留了mybatis-plus的自带方法List methodList = super.getMethodList(mapperClass, tableInfo);methodList.add(new InsertBatchSomeColumn(i -> i.getFieldFill() != FieldFill.UPDATE));return methodList;}}

（2）、定义核心配置类注入此Bean

@Configuration
public class MybatisPlusConfig {@Beanpublic EasySqlInjector sqlInjector() {return new EasySqlInjector();}
}

（3）、编写UserService服务类

public class UserService{@Resourceprivate UserMapper userMapper;public void InsertUsers(){long start = System.currentTimeMillis();List userList = new ArrayList<>();User user;for(int i = 0 ;i < 10000; i++) {user = new User();user.setUsername("name" + i);user.setPassword("password" + i);userList.add(user);}userMapper.insertBatchSomeColumn(userList);long end = System.currentTimeMillis();System.out.println("一万条数据总耗时：" + (end-start) + "ms" );}
}

（4）、编写EasyBaseMapper接口

public interface EasyBaseMapper extends BaseMapper {/*** 批量插入 仅适用于mysql** @param entityList 实体列表* @return 影响行数*/Integer insertBatchSomeColumn(Collection entityList);
}

（5）、编写UserMapper接口

@Mapper
public interface UserMapper extends EasyBaseMapper {}

（6）、单元测试结果

一万条数据总耗时：575ms