java - Spring data JPA批量插入很慢

Question

我正在尝试读取包含 700K+ 记录的 Excel 文件，并将它们批量插入 MySQL 数据库表中。

请注意，Excel 解析速度很快，我可以在 50 秒左右的时间内获取 ArrayList 中的实体对象。

我正在使用 Spring Boot 和 Spring Data JPA。

下面是我的部分 application.properties 文件:

hibernate.jdbc.batch_size=1000
spring.jpa.hibernate.use-new-id-generator-mappings=true

和我的部分实体类:

@Entity
@Table(name = "WHT_APPS", schema = "TEST")
public class WHTApps {

    @Id
    @TableGenerator(name = "whtAppsGen", table = "ID_GEN", pkColumnName = "GEN_KEY", valueColumnName = "GEN_VAL")
    @GeneratedValue(strategy = GenerationType.TABLE, generator = "whtAppsGen")
    private Long id;

    @Column(name = "VENDOR_CODE")
    private int vendorCode;
    .
    .
    .
    .

下面是我的DAO:

@Repository
@Transactional
public class JapanWHTDaoImpl implements JapanWHTDao {

    @Autowired
    JapanWHTAppsRepository appsRepo;

    @Override
    public void storeApps(List<WHTApps> whtAppsList) {
        appsRepo.save(whtAppsList);

    }

下面是Repository类:

@Transactional
public interface JapanWHTAppsRepository extends JpaRepository<WHTApps, Long> {

}

有人可以告诉我我在这里做错了什么吗？

编辑:

进程未完成并最终抛出错误:-

2017-08-15 15:15:24.516  WARN 14710 --- [tp1413491716-17] o.h.engine.jdbc.spi.SqlExceptionHelper   : SQL Error: 0, SQLState: 08S01
2017-08-15 15:15:24.516 ERROR 14710 --- [tp1413491716-17] o.h.engine.jdbc.spi.SqlExceptionHelper   : Communications link failure

The last packet successfully received from the server was 107,472 milliseconds ago.  The last packet sent successfully to the server was 107,472 milliseconds ago.
2017-08-15 15:15:24.518  INFO 14710 --- [tp1413491716-17] o.h.e.j.b.internal.AbstractBatchImpl     : HHH000010: On release of batch it still contained JDBC statements
2017-08-15 15:15:24.525  WARN 14710 --- [tp1413491716-17] c.m.v.c3p0.impl.DefaultConnectionTester  : SQL State '08007' of Exception tested by statusOnException() implies that the database is invalid, and the pool should refill itself with fresh Connections.

com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Communications link failure during rollback(). Transaction resolution unknown.
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_131]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_131]
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_131]
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_131]
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:425) ~[mysql-connector-java-5.1.43.jar:5.1.43]
    .
    .
    .
    .
    2017-08-15 15:15:24.526  WARN 14710 --- [tp1413491716-17] c.m.v2.c3p0.impl.NewPooledConnection     : [c3p0] A PooledConnection that has already signalled a Connection error is still in use!
2017-08-15 15:15:24.527  WARN 14710 --- [tp1413491716-17] c.m.v2.c3p0.impl.NewPooledConnection     : [c3p0] Another error has occurred [ com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Communications link failure during rollback(). Transaction resolution unknown. ] which will not be reported to listeners!

com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Communications link failure during rollback(). Transaction resolution unknown.
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_131]

谢谢

Answer 1

我还想指出一件事。问题不仅可能出在 Hibernate 上，还可能出在 DB 上。

当您在一个事务中插入 700k 个对象时，它可以存储在数据库的回滚段中等待事务提交。

如果可能的话，将逻辑拆分为在中间进行提交。

从主列表创建 1k 大小的子列表，保存子列表并在每次保存子列表后提交。