应用程序开发人员常见的数据库开发错误有哪些?


当前回答

因为“它太神奇了”或“不在我的数据库中”这样的原因,而放弃像Hibernate这样的ORM。 过度依赖像Hibernate这样的ORM,并试图将它硬塞到不合适的地方。

其他回答

没有对应用程序中的数据库连接管理给予足够的重视。然后,您发现应用程序、计算机、服务器和网络都阻塞了。

因为“它太神奇了”或“不在我的数据库中”这样的原因,而放弃像Hibernate这样的ORM。 过度依赖像Hibernate这样的ORM,并试图将它硬塞到不合适的地方。

使用ORM进行批量更新 选择多于需要的数据。同样,这通常在使用ORM时完成 在循环中触发sql。 没有良好的测试数据,只在实时数据上注意到性能下降。

使用Access而不是“真正的”数据库。有很多很棒的小型甚至免费的数据库,比如SQL Express、MySQL和SQLite,它们可以更好地工作和扩展。应用程序通常需要以意想不到的方式进行扩展。

我想补充一点: 偏好“优雅”代码而不是高性能代码。在应用程序开发人员看来,对数据库最有效的代码通常是丑陋的。

Believing that nonsense about premature optimization. Databases must consider performance in the original design and in any subsequent development. Performance is 50% of database design (40% is data integrity and the last 10% is security) in my opinion. Databases which are not built from the bottom up to perform will perform badly once real users and real traffic are placed against the database. Premature optimization doesn't mean no optimization! It doesn't mean you should write code that will almost always perform badly because you find it easier (cursors for example which should never be allowed in a production database unless all else has failed). It means you don't need to look at squeezing out that last little bit of performance until you need to. A lot is known about what will perform better on databases, to ignore this in design and development is short-sighted at best.