How Can I Safely Use a List in a MySQL IN Clause in Python?

Using a List Safely in a MySQL IN Clause in Python

In Python, you can easily convert a list into a string using the join() method. However, when using that string in a MySQL IN clause, it's crucial to avoid SQL injection vulnerabilities.

The traditional approach involves manually quoting and escaping the string before executing it, which can be prone to error. To address this, you can leverage the powerful list_of_ids directly using the following technique:

1. Create a Format String: Create a string with placeholders for the values in the list. For example, if list_of_ids has 3 elements, create a string like ','.join(['%s'] * 3), which would result in "?, ?, ?".
2. Execute the Query: Use the execute() method of the cursor object to execute the query. Pass the format string as the first argument and the list_of_ids as the second argument. This ensures that the values are passed as parameters, not interpolated into the query string.

format_strings = ','.join(['%s'] * len(list_of_ids))
cursor.execute("DELETE FROM foo.bar WHERE baz IN (%s)" % format_strings, tuple(list_of_ids))

By utilizing this approach, you can safely use a list in a MySQL IN clause without worrying about SQL injection. The data is passed directly as parameters, eliminating the need for manual quoting and escaping.

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