MyBatis批量插入的五種方式
一:預(yù)備工作
1:pom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>
2:配置yml文件
server: port: 8080 spring: datasource: username: mysql用戶名 password: mysql密碼 url: jdbc:mysql://localhost:3306/數(shù)據(jù)庫名字?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=UTC driver-class-name: com.mysql.cj.jdbc.Driver mybatis: mapper-locations: classpath:mapping/*.xml
3:公用的User類:
@Data public class User { private int id; private String username; private String password; }
二、不同的實(shí)現(xiàn)方法
1:MyBatis利用For循環(huán)批量插入
(1)、編寫UserService服務(wù)類,測試一萬條數(shù)據(jù)耗時(shí)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(shù)據(jù)總耗時(shí):" + (end-start) + "ms" ); } }
(2)、編寫UserMapper接口
@Mapper public interface UserMapper { Integer insertUsers(User user); }
(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>
(4)、進(jìn)行單元測試
@SpringBootTest class DemoApplicationTests { @Resource private UserService userService; @Test public void insert(){ userService.InsertUsers(); } }
(5)、結(jié)果輸出
一萬條數(shù)據(jù)總耗時(shí):26348ms
2:MyBatis的手動批量提交
(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(guān)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(shù)據(jù)總耗時(shí):" + (end-start) + "ms" ); } }
(2)、結(jié)果輸出
一萬條數(shù)據(jù)總耗時(shí):24516ms
3:MyBatis以集合方式批量新增(推薦)
(1)、編寫UserService服務(wù)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(shù)據(jù)總耗時(shí):" + (end-start) + "ms" ); } }
(2)、編寫UserMapper接口
@Mapper public interface UserMapper { Integer insertUsers(List<User> userList); }
(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)、輸出結(jié)果
一萬條數(shù)據(jù)總耗時(shí):521ms
4:MyBatis-Plus提供的SaveBatch方法
(1)、編寫UserService服務(wù)
@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(shù)據(jù)總耗時(shí):" + (end-start) + "ms" ); } }
(2)、編寫UserMapper接口
@Mapper public interface UserMapper extends BaseMapper<User> { }
(3)、單元測試結(jié)果
一萬條數(shù)據(jù)總耗時(shí):24674ms
5:MyBatis-Plus提供的InsertBatchSomeColumn方法(推薦)
(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(rèn)注入器),調(diào)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; } }
(2)、定義核心配置類注入此Bean
@Configuration public class MybatisPlusConfig { @Bean public EasySqlInjector sqlInjector() { return new EasySqlInjector(); } }
(3)、編寫UserService服務(wù)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(shù)據(jù)總耗時(shí):" + (end-start) + "ms" ); } }
(4)、編寫EasyBaseMapper接口
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(shù)據(jù)總耗時(shí):" + (end-start) + "ms" ); } }
(5)、編寫UserMapper接口
@Mapper public interface UserMapper<T> extends EasyBaseMapper<User> { }
(6)、單元測試結(jié)果
一萬條數(shù)據(jù)總耗時(shí):575ms
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