How Can I Secure My Python UPDATE Statement Against SQL Injection?

Protecting Against SQL Injection in Python

Ensuring the security of database interactions is crucial in preventing SQL injection attacks. When accepting user input susceptible to manipulation, it's imperative to implement safeguards on the server side. This article addresses the need to secure an UPDATE operation in Python against SQL injection.

In the given scenario, the method setLabel takes user-provided input and executes an SQL UPDATE query without proper protection. To mitigate this, the input string must be escaped before it can be safely passed to the database cursor.

Python's sqlite3 library provides built-in mechanisms to prevent SQL injection. Replace the placeholder variables with appropriately quoted values:

def setLabel( self, userId, refId, label ):
    self._db.cursor().execute(
        """UPDATE items SET label = ? WHERE userId IS ? AND refId IS ?""",
        ( sqlite3.escape(label), userId, refId )
    )
    self._db.commit()

By utilizing the sqlite3.escape function, the provided label will be correctly escaped, preventing any malicious characters or injection attempts.

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