Question

有人可以帮助我，问题是当我运行此代码时，我不断收到此语法错误：遇到＆＃34; [＆＃34;在第1栏第24栏。建立成功（总时间：44秒）我无法在代码中看到我在哪里犯了错误

String id = JOptionPane.showInputDialog(null, "Please enter the Employess ID", JOptionPane.QUESTION_MESSAGE);

                String fname = JOptionPane.showInputDialog(null, "Please enter Employess First NAME", JOptionPane.QUESTION_MESSAGE);
                String sname = JOptionPane.showInputDialog(null, "Please enter Employess Surname NAME", JOptionPane.QUESTION_MESSAGE);
                String pss = JOptionPane.showInputDialog(null, "Please enter the Employess PPS Number", JOptionPane.QUESTION_MESSAGE);   
                String cnum = JOptionPane.showInputDialog(null, "Please ente thr Employess Contact Number", JOptionPane.QUESTION_MESSAGE);
                String address  = JOptionPane.showInputDialog(null, "Please enter Employess  Address", JOptionPane.QUESTION_MESSAGE);
                String dep = JOptionPane.showInputDialog(null, "Please enter Employess Deparment ", JOptionPane.QUESTION_MESSAGE);
                String sal = JOptionPane.showInputDialog(null, "Please enter Employess  salary", JOptionPane.QUESTION_MESSAGE);

            JOptionPane.showConfirmDialog(null, id + sname +  "Records have been entered ");

       try{

    String host = "jdbc:derby://localhost/ee ";
    String uName = "aa";
    String uPass = "bb";
Connection con = DriverManager.getConnection(host, uName, uPass);
//Connection con = DriverManager.getConnection(host);
//Customer Lookup by Last Name

//SQL

String sql = "UPDATE emp SET  fname = [?],sname = [?],pss = [?],cnum = [?],address = [?],dep = [?],sal =[?] where id = [?]";



prest = con.prepareStatement(sql);


    prest.setString(1,id);
    prest.setString(2,fname);
    prest.setString(3,sname);
    prest.setString(4,pss);
    prest.setString(5,cnum);
    prest.setString(6,address);
    prest.setString(7,dep);
    prest.setString(8,sal);
    prest.executeUpdate();


    }
    catch (SQLException err) {

    System.out.println(err.getMessage());
    }
    }
                }

    }

Answer 1

参数占位符（?）应始终紧跟等号而没有任何类型的分隔符：

String sql = "UPDATE emp SET fname=?, sname=?, pss=?, cnum=?, address=?, dep=?, sal=? WHERE id=?";

或

String sql = "UPDATE emp SET fname = ?, sname = ?, pss = ?, cnum = ?, address = ?, dep = ?, sal = ? WHERE id = ?";

更新derby数据库中的记录无效

1 个答案: