一、準備工作

1.1、導入pom.xml依賴

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <scope>runtime</scope>
</dependency>

<!--Mybatis依賴-->
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.2.2</version>
</dependency>

<!--Mybatis-Plus依賴-->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.5.2</version>
</dependency>

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <optional>true</optional>
</dependency>

1.2、配置yml文件

server:
  port: 8080
 
spring:
  datasource:
    username: root
    password: root
    url: jdbc:mysql://localhost:3306/user?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=UTC
    driver-class-name: com.mysql.cj.jdbc.Driver
 
mybatis:
  mapper-locations: classpath:mapping/*.xml

1.3、公用的User類

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

二、MyBatis利用For循環批量插入

2.1、編寫UserService服務類，測試一萬條數據耗時情況

@Service
public class UserService {
 
    @Resource
    private 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("一萬條數據總耗時：" + (end-start) + "ms" );
    }
 
}

2.2、編寫UserMapper接口

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

2.3、編寫UserMapper.xml文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.ithuang.demo.mapper.UserMapper">
    <insert id="insertUsers">
        INSERT INTO user (username, password)
        VALUES(#{username}, #{password})
    </insert>
</mapper>

2.4、進行單元測試

@SpringBootTest
class DemoApplicationTests {
 
    @Resource
    private UserService userService;
 
    @Test
    public void insert(){
        userService.InsertUsers();
    }
 
}

2.5、結果輸出

一萬條數據總耗時：26348ms

三、MyBatis的手動批量提交

3.1、其他保持不變，Service層作稍微的變化

@Service
public class UserService {
 
    @Resource
    private UserMapper userMapper;
 
    @Resource
    private SqlSessionTemplate sqlSessionTemplate;
 
    public void InsertUsers(){
        //關閉自動提交
        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("一萬條數據總耗時：" + (end-start) + "ms" );
    }
 
}

3.2、結果輸出

一萬條數據總耗時：24516ms

四、MyBatis以集合方式批量新增（推薦）

4.1、編寫UserService服務類

@Service
public class UserService {
 
    @Resource
    private UserMapper userMapper;
 
    public void InsertUsers(){
        long start = System.currentTimeMillis();
        List<User> 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("一萬條數據總耗時：" + (end-start) + "ms" );
    }
 
}

4.2、編寫UserMapper接口

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

4.3、編寫UserMapper.xml文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.ithuang.demo.mapper.UserMapper">
    <insert id="insertUsers">
        INSERT INTO user (username, password)
        VALUES
        <foreach collection ="userList" item="user" separator =",">
            (#{user.username}, #{user.password})
        </foreach>
    </insert>
</mapper>

4.4、輸出結果

一萬條數據總耗時：521ms

五、MyBatis-Plus提供的SaveBatch方法

5.1、編寫UserService服務

@Service
public class UserService extends ServiceImpl<UserMapper, User> implements IService<User> {
 
    public void InsertUsers(){
        long start = System.currentTimeMillis();
        List<User> 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("一萬條數據總耗時：" + (end-start) + "ms" );
    }
}

5.2、編寫UserMapper接口

@Mapper
public interface UserMapper extends BaseMapper<User> {
 
}

5.3、單元測試結果

一萬條數據總耗時：24674ms

六、MyBatis-Plus提供的InsertBatchSomeColumn方法（推薦）

6.1、編寫EasySqlInjector 自定義類

public class EasySqlInjector extends DefaultSqlInjector {
 
 
    @Override
    public List<AbstractMethod> getMethodList(Class<?> mapperClass, TableInfo tableInfo) {
        // 注意：此SQL注入器繼承了DefaultSqlInjector(默認注入器)，調用了DefaultSqlInjector的getMethodList方法，保留了mybatis-plus的自帶方法
        List<AbstractMethod> methodList = super.getMethodList(mapperClass, tableInfo);
        methodList.add(new InsertBatchSomeColumn(i -> i.getFieldFill() != FieldFill.UPDATE));
        return methodList;
    }
 
}

6.2、定義核心配置類注入此Bean

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

6.3、編寫UserService服務類

public class UserService{
 
    @Resource
    private UserMapper userMapper;
    public void InsertUsers(){
        long start = System.currentTimeMillis();
        List<User> 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("一萬條數據總耗時：" + (end-start) + "ms" );
    }
}

6.4、編寫EasyBaseMapper接口

public interface EasyBaseMapper<T> extends BaseMapper<T> {
    /**
     * 批量插入 僅適用于mysql
     *
     * @param entityList 實體列表
     * @return 影響行數
     */
    Integer insertBatchSomeColumn(Collection<T> entityList);
}

6.5、編寫UserMapper接口

@Mapper
public interface UserMapper<T> extends EasyBaseMapper<User> {
    
}

6.6、單元測試結果

一萬條數據總耗時：575ms