spring 引導中的 Hibernate 統計信息不起作用？

Question

我在這里有一個小示例應用程序

https://github.com/jimbasilio/SpringBoot

這會在數據庫中創建一些簡單的數據以及我正在處理的其他一些事情，以便在 spring 引導上踢輪胎（旁注：到目前為止，我喜歡 spring 引導。:)。 如果您克隆 git 存儲庫，您可以訪問以下網址：

http://127.0.0.1:8080/hello/get/1

它將從數據庫中加載並將 hibernate 統計信息寫入控制台。

我確實有一個問題，無論是否通過 application.properties 文件配置 hibernate 統計信息：

hibernate.generate_statistics=true

當我寫出 hibernate 統計數據時，我沒有得到任何有用的信息。 我通過以下方式獲取統計信息：

Session session = (Session) this.entityManager.getDelegate();
session.getSessionFactory().getStatistics().logSummary();
HelloEntity entity = helloRepository.findOne(id);
entityManager.flush();
session.getSessionFactory().getStatistics().logSummary();

我的第二條日志消息（刷新后）如下。 您可以看到它甚至沒有注冊正在打開的會話。 我正在使用 spring 啟動 1.0.1.RELEASE。

pom.xml

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.0.1.RELEASE</version>
</parent>

日志文件：

2014-04-28 20:51:29.415  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000161: Logging statistics....
2014-04-28 20:51:29.416  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000251: Start time: 1398732682476
2014-04-28 20:51:29.416  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000242: Sessions opened: 0
2014-04-28 20:51:29.416  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000241: Sessions closed: 0
2014-04-28 20:51:29.416  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000266: Transactions: 0
2014-04-28 20:51:29.416  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000258: Successful transactions: 0
2014-04-28 20:51:29.417  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000187: Optimistic lock failures: 0
2014-04-28 20:51:29.417  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000105: Flushes: 0
2014-04-28 20:51:29.417  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000048: Connections obtained: 0
2014-04-28 20:51:29.417  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000253: Statements prepared: 0
2014-04-28 20:51:29.417  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000252: Statements closed: 0
2014-04-28 20:51:29.417  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000239: Second level cache puts: 0
2014-04-28 20:51:29.418  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000237: Second level cache hits: 0
2014-04-28 20:51:29.418  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000238: Second level cache misses: 0
2014-04-28 20:51:29.418  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000079: Entities loaded: 0
2014-04-28 20:51:29.418  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000080: Entities updated: 0
2014-04-28 20:51:29.418  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000078: Entities inserted: 0
2014-04-28 20:51:29.418  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000076: Entities deleted: 0
2014-04-28 20:51:29.419  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000077: Entities fetched (minimize this): 0
2014-04-28 20:51:29.419  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000033: Collections loaded: 0
2014-04-28 20:51:29.419  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000036: Collections updated: 0
2014-04-28 20:51:29.419  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000035: Collections removed: 0
2014-04-28 20:51:29.419  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000034: Collections recreated: 0
2014-04-28 20:51:29.420  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000032: Collections fetched (minimize this): 0
2014-04-28 20:51:29.420  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000438: NaturalId cache puts: 0
2014-04-28 20:51:29.420  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000439: NaturalId cache hits: 0
2014-04-28 20:51:29.420  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000440: NaturalId cache misses: 0
2014-04-28 20:51:29.420  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000441: Max NaturalId query time: 0ms
2014-04-28 20:51:29.420  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000442: NaturalId queries executed to database: 0
2014-04-28 20:51:29.420  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000210: Queries executed to database: 0
2014-04-28 20:51:29.420  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000215: Query cache puts: 0
2014-04-28 20:51:29.421  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000433: update timestamps cache puts: 0
2014-04-28 20:51:29.421  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000434: update timestamps cache hits: 0
2014-04-28 20:51:29.421  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000435: update timestamps cache misses: 0
2014-04-28 20:51:29.421  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000213: Query cache hits: 0
2014-04-28 20:51:29.421  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000214: Query cache misses: 0
2014-04-28 20:51:29.421  INFO 18044 --- [nio-8080-exec-1] o.h.s.internal.ConcurrentStatisticsImpl  : HHH000173: Max query time: 0ms

Answer 1

使用spring.jpa.properties.hibernate.generate_statistics=true代替
hibernate.generate_statistics=true

Answer 2

我認為Hibernate只是不讀你的配置。

根據Hibernate的參考手冊，您應該將Hibernate配置放在hibernate.properties或hibernate.cfg.xml上。 如果那些不起作用，您可能還想嘗試編程配置。

Answer 3

我的 spring 啟動應用程序中也有同樣的問題。 我發現的所有教程和線程都告訴我使用spring.jpa.properties.hibernate.generate_statistics=true但它不起作用然后我將 hibernate.properties 文件添加到資源文件夾並在文件內添加hibernate.generate_statistics=true然后我重新啟動我的 spring 啟動應用程序。

So I guess there is some bug/issue in some specific spring boot version(I was using 2.2.13) where the generate_statistics would not be taken by hibernate from spring.jpa.properties . 順便說一句，像format_sql這樣的所有其他屬性都可以通過在 spring.jpa.properties 中設置來工作