How to Safely Insert Lists into MySQL IN Clauses?

Insert Lists Safely into MySQL IN Clauses

This article explores an efficient and secure method for inserting lists into IN clauses within MySQL databases. While the traditional approach involves mapping lists to strings and inserting them directly, this method poses a risk of SQL injection due to the need for manual quoting and escaping.

To avoid this vulnerability, a safer approach is to use the list directly as a parameter in the MySQL query. The following code demonstrates this method:

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

This code accomplishes the following:

• Avoids Manual Quoting: By using the '%s' format specifier, the data in list_of_ids is automatically passed to MySQL's driver as a parameter, eliminating the need for manual quoting.
• Prevents SQL Injection: The data is inserted as a parameter, ensuring that it is not interpreted as part of the query. This makes the query immune to SQL injection attacks.
• Supports Any Characters: The data can contain any characters without requiring removal or quoting.

It's important to note that this method relies on the MySQL driver's ability to handle parameters securely. As long as the data is passed correctly as a parameter, the query remains safe from SQL injection.

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