Question

当我尝试在运行程序时更改变量时，更新不适用。它没有任何错误。它表示更新已成功记录，但不适用于Mysql。请帮忙！

StaffDA

 public void actionPerformedUpdate() {
  if (StaffDA.updateCustomer(customer)) {
    txtfName.setEditable(false);
    txtlName.setEditable(false);
    txtGender.setEditable(false);
    txtEmail.setEditable(false);
    txtDateOfBirth.setEditable(false);
    txtUserId.setEditable(false);
    txtPassword.setEditable(false);
    txtContactNumber.setEditable(false);
    txtAddress.setEditable(false);

                JOptionPane.showMessageDialog(myFrame,
                    "Record updated successfully", "Alert",
                    JOptionPane.INFORMATION_MESSAGE);
                }
            else {
                JOptionPane.showMessageDialog(myFrame,
                        "Database Error. Record not updated.", "Alert",
                        JOptionPane.ERROR_MESSAGE);
            }

        }

StaffUpdatePanel

    public static boolean updateCustomer(Customer customer) {
    //declare local variables
    boolean success = false;
    DBController db = new DBController();
    String dbQuery; 
    PreparedStatement pstmt;

    //step 1 - establish connection to database
    db.getConnection();     

    //step 2 - declare the SQL statement
    dbQuery = "UPDATE customer SET fName = ?, lName = ?, gender = ?, email = ?, dateOfBirth = ?, userId = ?, password = ? ,contactNumber = ?, address = ? WHERE id = ?";
    pstmt = db.getPreparedStatement(dbQuery);

    //step 3 - to update record using executeUpdate method
    try {

        pstmt.setString(1, customer.getfName());
        pstmt.setString(2, customer.getlName());
        pstmt.setString(3, customer.getGender());
        pstmt.setString(4, customer.getEmail());
        pstmt.setString(5, customer.getDateOfBirth());
        pstmt.setString(6, customer.getUserId());
        pstmt.setString(7, customer.getPassword());
        pstmt.setString(8, customer.getContactNumber());
        pstmt.setString(9, customer.getAddress());
        pstmt.setInt(10, customer.getId());
        if (pstmt.executeUpdate() == 1)
            success = true;
        pstmt.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
    System.out.println(success);
    //step 4 - close connection
    db.terminate();

    return success;     
}

Answer 1

数据库用户对数据库的访问权限可能存在问题。如果可以对数据库执行select语句，则可以将DB用户设置为仅具有读访问权限。

此外，您可以尝试打印更新语句并在同一用户的数据库上手动运行，以查看数据库系统本身是否可以正确运行更新，在这种情况下，您已将问题缩小到代码而不是访问权限。

此更新不适用

1 个答案: