MyBatis批量插入的五种方式小结(MyBatis以集合方式批量新增)
作者:小徐敲java
本文主要介绍了MyBatis批量插入的五种方式小结(MyBatis以集合方式批量新增),文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友们下面随着小编来一起学习学习吧
一、准备工作
1.1、导入pom.xml依赖
<dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <!--Mybatis依赖--> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>2.2.2</version> </dependency> <!--Mybatis-Plus依赖--> <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类
@Data public class User { private int id; private String username; private String password; }
二、MyBatis利用For循环批量插入
2.1、编写UserService服务类,测试一万条数据耗时情况
@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("一万条数据总耗时:" + (end-start) + "ms" ); } }
2.2、编写UserMapper接口
@Mapper public interface UserMapper { Integer insertUsers(User user); }
2.3、编写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、进行单元测试
@SpringBootTest class DemoApplicationTests { @Resource private UserService userService; @Test public void insert(){ userService.InsertUsers(); } }
2.5、结果输出
一万条数据总耗时:26348ms
三、MyBatis的手动批量提交
3.1、其他保持不变,Service层作稍微的变化
@Service public class UserService { @Resource private UserMapper userMapper; @Resource private 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" ); } }
3.2、结果输出
一万条数据总耗时:24516ms
四、MyBatis以集合方式批量新增(推荐)
4.1、编写UserService服务类
@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("一万条数据总耗时:" + (end-start) + "ms" ); } }
4.2、编写UserMapper接口
@Mapper public interface UserMapper { Integer insertUsers(List<User> userList); }
4.3、编写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、输出结果
一万条数据总耗时:521ms
五、MyBatis-Plus提供的SaveBatch方法
5.1、编写UserService服务
@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("一万条数据总耗时:" + (end-start) + "ms" ); } }
5.2、编写UserMapper接口
@Mapper public interface UserMapper extends BaseMapper<User> { }
5.3、单元测试结果
一万条数据总耗时:24674ms
六、MyBatis-Plus提供的InsertBatchSomeColumn方法(推荐)
6.1、编写EasySqlInjector 自定义类
public class EasySqlInjector extends DefaultSqlInjector { @Override public List<AbstractMethod> 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<AbstractMethod> methodList = super.getMethodList(mapperClass, tableInfo); methodList.add(new InsertBatchSomeColumn(i -> i.getFieldFill() != FieldFill.UPDATE)); return methodList; } }
6.2、定义核心配置类注入此Bean
@Configuration public class MybatisPlusConfig { @Bean public EasySqlInjector sqlInjector() { return new EasySqlInjector(); } }
6.3、编写UserService服务类
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("一万条数据总耗时:" + (end-start) + "ms" ); } }
6.4、编写EasyBaseMapper接口
public interface EasyBaseMapper<T> extends BaseMapper<T> { /** * 批量插入 仅适用于mysql * * @param entityList 实体列表 * @return 影响行数 */ Integer insertBatchSomeColumn(Collection<T> entityList); }
6.5、编写UserMapper接口
@Mapper public interface UserMapper<T> extends EasyBaseMapper<User> { }
6.6、单元测试结果
一万条数据总耗时:575ms
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