How to Safely Insert Variables into SQL Queries in Python?

Using variables in SQL statements in Python

When working with SQL statements in Python, it is important to pay attention to how variables are integrated into the query. In the provided Python code, there is a query that needs to insert the variables var1, var2, and var3 into a SQL table. The problem is to avoid interpreting the variables as part of the query text.

To solve this problem, the execute() method provides a mechanism to pass variables as tuples. The modified code is as follows:

cursor.execute("INSERT INTO table VALUES (%s, %s, %s)", (var1, var2, var3))

Please note:

• Parameters are passed as tuples, (var1, var2, var3).
• If only one parameter is passed, the tuple must end with a comma, (a,).

The database API handles proper escaping and quoting of variables. However, it is crucial to avoid using the string formatting operator (%) for the following reasons:

• It does not perform escaping or quoting, increasing the risk of SQL injection vulnerabilities.
• It can also lead to uncontrolled string formatting attacks.

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