Refactored to use parameterized SQL APIs

[pixeebot]

This change refactors SQL statements to be parameterized, rather than built by hand.

Without parameterization, developers must remember to escape inputs using the rules for that database. It's usually buggy, at the least -- and sometimes vulnerable.

Our changes look something like this:

- Statement stmt = connection.createStatement();
- ResultSet rs = stmt.executeQuery("SELECT * FROM users WHERE name = '" + user + "'");
+ PreparedStatement stmt = connection.prepareStatement("SELECT * FROM users WHERE name = ?");
+ stmt.setString(1, user);
+ ResultSet rs = stmt.executeQuery();

More reading

• https://cheatsheetseries.owasp.org/cheatsheets/SQL_Injection_Prevention_Cheat_Sheet.html
• https://cwe.mitre.org/data/definitions/89.html

I have additional improvements ready for this repo! If you want to see them, leave the comment:

@pixeebot next

... and I will open a new PR right away!

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