Many of us have experienced the repercussions of accidentally deleting more data than we intended, and it's a typical problem in large systems. Here are two practical methods to protect your data from these kinds of incidents:
1. SQL Trigger to Prevent DELETE Without WHERE Clause
First approach is to use a SQL Trigger to ensure that no delete operation runs without a WHERE clause. A trigger can be created to fire on DELETE operations and validate the statement before it executes.
- Prevents accidental deletes at the database level.
- Provides an additional layer of protection, especially against unintentional bulk deletions.
- Ensures that your data is protected even if an application bypasses safeguards.
Cons. Requires additional database configuration and can add complexity to your schema. Doesn’t offer as much flexibility for more complex delete scenarios.
2. Interceptor to Prevent DELETE Without WHERE Clause
You can create a custom command interceptor to intercept any DELETE operation and ensure that it includes a WHERE clause. This prevents broad deletion commands from executing, ensuring that no rows are accidentally deleted without proper conditions.
- Prevents accidental deletes via the application.
- Helps enforce better practices for safe deletion operations.
- Increases application-level security
Cons
While the performance overhead is generally acceptable, it can be configured to limit the scope, applying the interceptor only to specific queries or operations, thereby reducing unnecessary overhead.
Note. The same approach for preventing DELETE without a WHERE clause can be easily achieved with different ORMs.
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