Spring Data JPA saveAll 不进行批量插入

Question

所以我使用了一个简单的 JpaRepository 并调用了 saveAll() 方法。

hibernate.jdbc.batch_size = 500
hibernate.order_inserts = true
hibernate.generate_statistics = true

运行应用程序后：

   8045055 nanoseconds spent acquiring 1 JDBC connections;
    0 nanoseconds spent releasing 0 JDBC connections;
    137189246 nanoseconds spent preparing 1158 JDBC statements;
    1417689514 nanoseconds spent executing 1158 JDBC statements;
    0 nanoseconds spent executing 0 JDBC batches;
    0 nanoseconds spent performing 0 L2C puts;
    0 nanoseconds spent performing 0 L2C hits;
    0 nanoseconds spent performing 0 L2C misses;
    16270990 nanoseconds spent executing 1 flushes (flushing a total of 1158 entities and 0 collections);
    0 nanoseconds spent executing 0 partial-flushes (flushing a total of 0 entities and 0 collections)

任何人都可以看到 0 执行 JDBC 批处理的原因吗？ 另外，我必须指出我的实体有 @GeneratedValue(strategy = IDENTITY) 主键

Answer 1

同时设置hibernate.order_updates = true。

将 org.hibernate.engine.jdbc.batch.internal.BatchingBatch 的记录器更改为 DEBUG 并查看您得到的输出。

Answer 2

为属性名称添加前缀 spring.jpa.properties。它应该是这样的：

spring.jpa.properties.hibernate.jdbc.batch_size = 500

Answer 3

Hibernate 不使用身份标识符生成器执行插入批处理。 更多信息是here。