查詢JDBC Java

Question

我的java/jdbc代碼有問題。

參數索引超出範圍（2號中的哪一個參數1）

代碼：

   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 = ?"; 

• 沒有圍繞
• JDBC不需要所需?引號;後任意 SQL語句
個
• 佔位?只能用於列的值