Mybatis中怎么批量插入数据
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1. 循环插入
mapper.xml:
INSERT INTO tb_student (name, age, phone, address, class_id) VALUES (#{name},#{age},#{phone},#{address},#{classId})
mapper接口:
public interface StudentMapper { int insert(Student student); }
测试代码:
//java项目www.fhadmin.org @SpringBootTest class DemoApplicationTests { @Resource private StudentMapper studentMapper; @Test public void testInsert(){ //数据生成 ListstudentList = createData(100); //循环插入 long start = System.currentTimeMillis(); studentList.stream().forEach(student -> studentMapper.insert(student)); System.out.println(System.currentTimeMillis() - start); } private List createData(int size){ List studentList = new ArrayList<>(); Student student; for(int i = 0; i < size; i++){ student = new Student(); student.setName("小王" + i); student.setAge(18); student.setClassId(1); student.setPhone("1585xxxx669"); student.setAddress("未知"); studentList.add(student); } return studentList; } }
2. foreach标签
mapper.xml:
INSERT INTO tb_student (name, age, phone, address, class_id) VALUES (#{name},#{age},#{phone},#{address},#{classId}) INSERT INTO tb_student (name, age, phone, address, class_id) VALUES (#{item.name},#{item.age},#{item.phone},#{item.address},#{item.classId})
mapper接口:
public interface StudentMapper { int insert(Student student); int insertBatch(ListstudentList); }
测试代码:
//java项目www.fhadmin.org @SpringBootTest class DemoApplicationTests { @Resource private StudentMapper studentMapper; @Test public void testInsertByForeachTag(){ //数据生成 ListstudentList = createData(100); //使用foreach标签,拼接SQL插入 long start = System.currentTimeMillis(); studentMapper.insertBatch(studentList); System.out.println(System.currentTimeMillis() - start); } private List createData(int size){ List studentList = new ArrayList<>(); Student student; for(int i = 0; i < size; i++){ student = new Student(); student.setName("小王" + i); student.setAge(18); student.setClassId(1); student.setPhone("1585xxxx669"); student.setAddress("未知"); studentList.add(student); } return studentList; } }
3. 批处理
测试代码:
//java项目www.fhadmin.org @SpringBootTest class DemoApplicationTests { @Autowired private SqlSessionFactory sqlSessionFactory; @Test public void testInsertBatch(){ //数据生成 ListstudentList = createData(100); //使用批处理 long start = System.currentTimeMillis(); SqlSession sqlSession = sqlSessionFactory.openSession(ExecutorType.BATCH,false); StudentMapper studentMapperNew = sqlSession.getMapper(StudentMapper.class); studentList.stream().forEach(student -> studentMapperNew.insert(student)); sqlSession.commit(); sqlSession.clearCache(); System.out.println(System.currentTimeMillis() - start); } private List createData(int size){ List studentList = new ArrayList<>(); Student student; for(int i = 0; i < size; i++){ student = new Student(); student.setName("小王" + i); student.setAge(18); student.setClassId(1); student.setPhone("1585xxxx669"); student.setAddress("未知"); studentList.add(student); } return studentList; } }
三种方式的对比
MySQL服务器版本:5.6.4
其他依赖版本如下:
4.0.0 org.springframework.boot spring-boot-starter-parent 2.4.4 com.buhe demo 0.0.1-SNAPSHOT demo Demo project for Spring Boot 1.8 org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-test test mysql mysql-connector-java 5.1.41 org.mybatis.spring.boot mybatis-spring-boot-starter 1.3.1 org.springframework.boot spring-boot-maven-plugin src/main/java **/*.xml
三种插入方式在不同数据量下的表现,测试结果:
插入方式 | 10条 | 100条 | 500条 | 1000条 |
---|---|---|---|---|
循环插入 | 496ms | 3330ms | 15584ms | 33755ms |
foreach标签 | 268ms | 366ms | 392ms | 684ms |
批处理 | 222ms | 244ms | 364ms | 426ms |
三种方式中,批处理的方式效率是最高的,尤其是在数据量大的情况下尤为明显。
其次是foreach标签,foreach标签是通过拼接SQL语句的方式完成批量操作的。但是当拼接的SQL过多,导致SQL大小超过了MySQL服务器中max_allowed_packet变量的值时,会导致操作失败,抛出PacketTooBigException异常。
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