Question

我一直在尝试使用带有MySQL数据库的Spring Boots JPA启用批量插入

在我的 application.properties ：

中

spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQLDialect
spring.datasource.url=jdbc:mysql://localhost:3306/demo?reconnect=true&rewriteBatchedStatements=true
spring.jpa.hibernate.jdbc.batch_size=500
spring.jpa.hibernate.order_inserts=true
spring.datasource.username=demo_user
spring.datasource.password=password
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

我尝试过使用CrudRepository.save(Iterable s)并尝试使用自定义存储库（我在另一个答案中看到过）：

@Component
public class BulkRepository<T extends Identifiable> {// Identifiable just has a getId method

    private static final int BATCH_SIZE = 500;

    private final EntityManager entityManager;

    @Autowired
    public BulkRepository(EntityManager entityManager) {
        this.entityManager = entityManager;
    }

    @Transactional
    public <S extends T> List<S> saveInBatch(Iterable<S> value) {
        List<S> entities = Lists.newArrayList(value);
        List<S> saved = new ArrayList<>(entities.size());
        int i = 0;
        for (S t : entities) {
            saved.add(persistOrMerge(t));
            i++;
            if (i % BATCH_SIZE == 0) {
                // Flush a batch of inserts and release memory.
                entityManager.flush();
                entityManager.clear();
            }
        }

        return saved;
    }

    private <S extends T> S persistOrMerge(S t) {
        if (t.getId() == null) {
            entityManager.persist(t);
            return t;
        } else {
            return entityManager.merge(t);
        }
    }
}

当我在MySql中启用一般查询日志时，它会将每个插入显示为单独的：

SET GLOBAL log_output = 'TABLE';
SET GLOBAL general_log = 'ON';

SELECT 
    event_time,
    user_Host,
    CONVERT(argument USING utf8) as query
FROM mysql.general_log
order by event_time desc
;

2017-12-22 12：31：48.290334 demo_user [demo_user] @ localhost [127.0.0.1] insert   到demo.test_table（id，string）值（1，'value1'）

2017-12-22 12：31：48.288328 demo_user [demo_user] @ localhost [127.0.0.1] insert into   demo.test_table（id，string）values（2，'value2'）

有什么我想念的吗？目前看起来我需要绕过Spring JPA并使用原始SQL。

Spring Data Batch插入

0 个答案: