查询JDBC Java

Question

I have a problem with my java/jdbc code.

parameter index out of range (2 number of parameters which is 1)

Code:

                Connection c = null;
                MySQL MySQL = new MySQL(Host, Port, Database, Username, Password);
                c = MySQL.open();  
              Player player = (Player) sender;
               String zapytanie = "UPDATE `?` SET `tag`=? WHERE   `name`='?';";
               PreparedStatement ps = c.prepareStatement( zapytanie );
               ps.setString(1, Tabel);
               ps.setString(2, red);
               ps.setString(3, player());
               ps.executeUpdate(); //Executes the query
               ps.close(); //Closes the query
               c.close();

Answer 1

final String zapytanie = "UPDATE " + Table + " SET tag = ? WHERE name = ?";

• No quotes around ? required
• JDBC doesn't require a ; after any SQL statement
• Place holders ? can only be used for column values