MyBatis-plus的五种批量插入方式对比分析
Mybatis批量插入一直是开发者重点关注的问题,本文列举了Mybatis的五种插入方式进行对比分析,验证了五种批量插入的方式的优先级。
1 准备工作
1.1 新建spring项目
略。
1.2 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>
1.3 配置yml文件
server: port: 8080 spring: 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=UTC driver-class-name: com.mysql.cj.jdbc.Driver mybatis: mapper-locations: classpath:mapping/*.xml
1.4 创建插入模型
@Data public class User { private int id; private String username; private String password; }
2 测试
2.1 Mybatis利用For循环批量插入
1、编写UserService服务类,测试一万条数据的耗时情况:
@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、编写UserMapper接口
@Mapper public interface UserMapper { Integer insertUsers(User user); }
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>
4、进行单元测试
@SpringBootTest class DemoApplicationTests { @Resource private UserService userService; @Test public void insert(){ userService.InsertUsers(); } }
5、输出结果
一万条数据耗时26348ms
2.2 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 { @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" ); } }
2、结果输出
一万条数据总耗时:24516ms。
2.3 Mybatis以集合方式批量新增
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" ); } }
2、编写UserMapper接口
@Mapper public interface UserMapper { Integer insertUsers(List<User> userList); }
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、输出结果
一万条数据总耗时:521ms
2.4 MyBatis-Plus提供的SaveBatch方法
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" ); } }
2、编写UserMapper接口
@Mapper public interface UserMapper extends BaseMapper<User> { }
3、单元测试结果
一万条数据总耗时:24674ms
2.5 MyBatis-Plus提供的InsertBatchSomeColumn方法
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; } }
2、定义核心配置类注入此Bean
@Configuration public class MybatisPlusConfig { @Bean public EasySqlInjector sqlInjector() { return new EasySqlInjector(); } }
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" ); } }
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); }
5、编写UserMapper接口
@Mapper public interface UserMapper<T> extends EasyBaseMapper<User> { }
6、单元测试结果
一万条数据总耗时:575ms
2.6 JDBC原生的批量插入
1、编写JDBC池化工具类
public class JDBCDruidUtils { private static DataSource dataSource; private static Connection conn; /* 创建数据Properties集合对象加载加载配置文件 */ static { Properties pro = new Properties(); //加载数据库连接池对象 try { //获取数据库连接池对象 pro.load(JDBCDruidUtils.class.getClassLoader().getResourceAsStream("druid.properties")); dataSource = DruidDataSourceFactory.createDataSource(pro); } catch (Exception e) { e.printStackTrace(); } } /* 获取连接 */ public static Connection getConnection() throws SQLException { return dataSource.getConnection(); } /** * 关闭conn,和 statement独对象资源 * * @param connection * @param statement * @MethodName: close * @return: void */ public static void close(Connection connection, Statement statement) { if (connection != null) { try { connection.close(); } catch (SQLException e) { e.printStackTrace(); } } if (statement != null) { try { statement.close(); } catch (SQLException e) { e.printStackTrace(); } } } /** * 关闭 conn , statement 和resultset三个对象资源 * * @param connection * @param statement * @param resultSet * @MethodName: close * @return: void */ public static void close(Connection connection, Statement statement, ResultSet resultSet) { close(connection, statement); if (resultSet != null) { try { resultSet.close(); } catch (SQLException e) { e.printStackTrace(); } } } /* 获取连接池对象 */ public static DataSource getDataSource() { return dataSource; } }
# druid.properties配置 driverClassName=com.mysql.cj.jdbc.Driver url=jdbc:mysql://localhost:3306/数据库?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=UTC username=用户名 password=密码 initialSize=10 maxActive=50 maxWait=60000
2、编写UserService服务类
public void InsertUsersByJdbc() { long start = System.currentTimeMillis(); Connection connection = null; PreparedStatement ps = null; try { connection = JDBCDruidUtils.getConnection(); //控制事务:默认不提交 connection.setAutoCommit(false); String sql = "INSERT INTO user (username, password) VALUES (?, ?)"; ps = connection.prepareStatement(sql); User user; for (int i = 0; i < 10000; i++) { user = new User(); user.setUsername("name" + i); user.setPassword("password" + i); ps.setString(1, user.getUsername()); ps.setString(2, user.getPassword()); //将一组参数添加到此 PreparedStatement 对象的批处理命令中。 ps.addBatch(); } //执行批处理 ps.executeBatch(); //手动提交事务 connection.commit(); } catch (SQLException e) { throw new RuntimeException(e); } finally { JDBCDruidUtils.close(connection, ps); } long end = System.currentTimeMillis(); System.out.println("一万条数据总耗时:" + (end - start) + "ms"); }
3、输出结果
1万数据总耗时19000ms。
3 总结
大量数据的场景下性能对比:InsertBatchSomeColumn>自定义xml以集合的方式>Jdbc原生>SaveBatch>手动for循环批量>自动for循环批量。
网上很多人都说JDBC原生性能很好,但是我发现其非常差,有可能是我使用的是mybatis-plus依赖,如果这是推论正确,那就可以证明mybatis-plus在mybatis的基础上不仅增强了功能也增强了性能。所以可以得出结论:开发中用mybatis-plus是没有错的,如果想提高性能,只能实施其他方案,比如分库分表,千万别想着JDBC原生性能更好。
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