sql - oracle sql触发循环更新和删除

Question

我在 oracle 上的触发器有问题。

我有类似的东西：

 Project
 -------
 currentProgress
 plannedLoads
 currentLoads


Step
----
currentProgress
plannedLoads
currentLoads


Task
----
currentProgress
plannedLoads
currentLoads

项目由 Step 组成，Step 由 Task 组成。

currentProgress 总是 = currentLoads/plannedLoads。

我在插入任务之前有一个触发器，以在插入、更新或删除时改进 Step currentLoads，并在 Step currentLoads 上另一个触发器以改进 Project currentLoads。

因此，如果我更新 Task 会调用两个触发器，一个用于更新 Step，然后一个用于 Project。

例如，当我更新 Step 时，我会更新它的 currentLoad。

问题是当我删除一个项目时。我还必须删除与之相关的步骤和任务。因此，调用了 Task 和 Step on delete 的触发器，调用了 Project 上的触发器。

我不确定我是否清楚。如果没有，请询​​问我的详细信息。

谢谢你的帮助。

Answer 1

This does not sound like an ideal scenario for triggers - they're better off used for additional validation (i.e. things that cannot be accomplished with constraints, not instead of constraints) / logging / sanity checks, etc. rather than application logic.

In addition, I would only use triggers for validation sparingly and as a complement to constraints and application validation.

I would strongly suggest moving the functionality for maintaining these records into a PL/SQL procedure, and invoke that instead of issuing DML statements against the tables directly. That way, you stay in control.