How can you prevent SQL injection in your applications?
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To prevent SQL injection in your applications, especially in Django or other modern frameworks, follow these key practices:
1. Use ORM (Object-Relational Mapping)
Django's ORM automatically escapes SQL queries, protecting against injection:
Avoid raw SQL when possible. The ORM ensures values are safely parameterized.
2. Parameterized Queries
If raw SQL is necessary, use Django’s connection.cursor() with parameters:
Avoid string formatting like:
3. Input Validation and Sanitization
Always validate user input using forms, serializers, or validators:
While validation doesn’t prevent SQL injection alone, it helps reject suspicious or malformed input.
4. Least Privilege Principle
Ensure the database user used by your app has only the permissions it needs. Don’t use a superuser account for routine queries.
5. Use Stored Procedures with Caution
If using stored procedures, ensure parameters are properly handled and avoid dynamic SQL inside them.
6. Regular Security Updates
Keep Django and its dependencies up to date. Django includes built-in protections that improve over time.
By combining ORM usage, parameterized queries, and proper input validation, you can effectively prevent SQL injection vulnerabilities in your Django apps.
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