Potential fix for code scanning alert no. 46: Query built from user-controlled sources

[davewichers]

Potential fix for https://github.com/aspectsecurity/TestCodeQL/security/code-scanning/46

In general, the fix is to stop concatenating user input into the SQL string and instead use parameter placeholders (?) for all variable parts, binding the actual values with PreparedStatement.setXxx methods. This ensures the database treats user input as data, not executable SQL.

For this specific file, we should change the SQL string on line 75 so that bar is no longer concatenated directly. Instead, define the query as "SELECT * from USERS where USERNAME=? and PASSWORD=?", and then bind both the username and password via PreparedStatement parameters. Since the existing code already binds the username at index 1 with "foo", we just need to add a second parameter binding for the password (bar) at index 2. No changes are needed to the way bar is computed; only its use in the query must be parameterized.

Concretely:

• In Benchmark00839.doPost, replace the line building sql with a version that uses a second ? placeholder for the password.
• After statement.setString(1, "foo");, add statement.setString(2, bar); so the user-controlled value is supplied safely.
• No new imports or helper methods are needed; PreparedStatement is already used.

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