PreparedStatement錯誤：參數12未定義

Question

我有11個要插入數據庫的字段。 顯示的錯誤是我的12個參數未定義，即ps.executeUpdate（）。 我該怎么辦？

我的插入方法如下。

public void update(User user){
        try{
        Connection conn = DbUtils.getConnection();
        PreparedStatement ps = conn.prepareStatement("UPDATE db.db set id = ?,username = ?,password = ?,firstname = ?, lastname = ?, fathersname =?, gender = ?, email = ?,address =? , phnno = ?, courses = ?" + "WHERE id =?");
        ps.setInt(1, user.getId());
        ps.setString(2, user.getName());
        ps.setString(3, user.getPwd());
        ps.setString(4, user.getFname());
        ps.setString(5,  user.getLname());
        ps.setString(6, user.getFathername());
        ps.setString(7, user.getAddress());
        ps.setString(8, user.getEmail());
        ps.setString(9, user.getGender());
        ps.setString(10, user.getPhno());
        ps.setString(11, user.getCradio());
        ps.execute();           
        }catch(Exception e){
            e.printStackTrace();            
    }
    `

Answer 1

函數應具有另一個用於12個占位符的參數。 像這樣：

public void update(User user){
        try{
        Connection conn = DbUtils.getConnection();
        PreparedStatement ps = conn.prepareStatement("UPDATE db.db set id = ?,username = ?,password = ?,firstname = ?, lastname = ?, fathersname =?, gender = ?, email = ?,address =? , phnno = ?, courses = ?" + " WHERE id =?");
        ps.setInt(1, user.getId());
        ps.setString(2, user.getName());
        ps.setString(3, user.getPwd());
        ps.setString(4, user.getFname());
        ps.setString(5,  user.getLname());
        ps.setString(6, user.getFathername());
        ps.setString(7, user.getAddress());
        ps.setString(8, user.getEmail());
        ps.setString(9, user.getGender());
        ps.setString(10, user.getPhno());
        ps.setString(11, user.getCradio());
        ps.setInt(12, user.getId()); //parameter 12 added
        ps.execute();           
        }catch(Exception e){
            e.printStackTrace();            
    }

您還真的要更新ID字段嗎？