MySQL C#查询故障-更新表

我在创建此函数以更新数据库时遇到问题。更新教员似乎可以完美地工作，而更新人员表却不能。我假设MySQL查询不适合更新person表

附加信息：出于测试目的，我的代码现在已经连接到一个GUI模拟。具有@Id..的更新字符串。。这只是选择我想要更改的ID

public static void Update(string update,string fName, string lName, string DOB, string postCode, string address, string phoneNumber,
                                        bool isTenured, string qualifications, string previousEmployment)
            {
                MySqlConnection conn;
                MySqlCommand cmd;
                string sql = "UPDATE person SET firstName = @FirstName , lastName = @LastName, DOB = @DOB, phoneNumber = @PhoneNumber, address = @Address, postCode = @PostCode WHERE ID =@Id;";
                GetConnection(out conn, out cmd, sql);

                try
                {
                    cmd.Parameters.AddWithValue("@Id", update);
                    cmd.Parameters.AddWithValue("@FirstName", fName);
                    cmd.Parameters.AddWithValue("@LastName", lName);
                    cmd.Parameters.AddWithValue("@DOB", DOB);
                    cmd.Parameters.AddWithValue("@PhoneNumber", phoneNumber);
                    cmd.Parameters.AddWithValue("@Address", address);
                    cmd.Parameters.AddWithValue("@PostCode", postCode);

                    long id = (long)cmd.LastInsertedId;

                    sql = "UPDATE facultymember SET isTenured = @IsTenured, qualifications = @Qualifications, previousEmployment = @PreviousEmployment WHERE Person_personID=@Id";
                    cmd = new MySqlCommand(sql, conn);
                    cmd.Parameters.AddWithValue("@IsTenured", isTenured);
                    cmd.Parameters.AddWithValue("@Qualifications", qualifications);
                    cmd.Parameters.AddWithValue("@PreviousEmployment", previousEmployment);
                    cmd.ExecuteNonQuery();

                }

                catch (NullReferenceException nre)
                {
                    MessageBox.Show(nre.Message);
                }
                catch (Exception e)
                {
                    MessageBox.Show(e.Message);
                }
                finally
                {
                    try
                    {
                        MessageBox.Show("Updated");
                        cmd.Connection.Close();
                        conn.Close();
                    }
                    catch (Exception e)
                    {
                        MessageBox.Show(e.Message);
                    }
                }
            }

---

您忘记在第二个sql查询中添加

@Id

参数

sql = "UPDATE facultymember
       SET isTenured = @IsTenured, qualifications = @Qualifications, previousEmployment = @PreviousEmployment
       WHERE Person_personID=@Id";
                        //   ^^^^
cmd = new MySqlCommand(sql, conn);
cmd.Parameters.AddWithValue("@IsTenured", isTenured);
cmd.Parameters.AddWithValue("@Qualifications", qualifications);
cmd.Parameters.AddWithValue("@PreviousEmployment", previousEmployment);
cmd.Parameters.AddWithValue("@Id", YourIdValue);
cmd.ExecuteNonQuery();

还可以使用处置您的

MySqlConnection

和

MySqlCommand

等

using(MySqlConnection conn = new MySqlConnection(ConnectionString))
using(MySqlCommand cmd = conn.CreateCommand())
{
  //
}

---

您忘记在第二个sql查询中添加

@Id

参数

sql = "UPDATE facultymember
       SET isTenured = @IsTenured, qualifications = @Qualifications, previousEmployment = @PreviousEmployment
       WHERE Person_personID=@Id";
                        //   ^^^^
cmd = new MySqlCommand(sql, conn);
cmd.Parameters.AddWithValue("@IsTenured", isTenured);
cmd.Parameters.AddWithValue("@Qualifications", qualifications);
cmd.Parameters.AddWithValue("@PreviousEmployment", previousEmployment);
cmd.Parameters.AddWithValue("@Id", YourIdValue);
cmd.ExecuteNonQuery();

还可以使用处置您的

MySqlConnection

和

MySqlCommand

等

using(MySqlConnection conn = new MySqlConnection(ConnectionString))
using(MySqlCommand cmd = conn.CreateCommand())
{
  //
}

---

您能告诉我您遇到了什么错误或该函数的意外行为吗。“Update faculty成员似乎工作得很好”当您的查询有@ID参数但在中您没有在命令对象中添加该参数时，您怎么能这么说。@Allonaz您确定您的第二个查询工作正常吗？因为我不这么认为。：）你能告诉我你得到了什么错误或该函数的意外行为吗。“更新教员似乎工作得很好”你怎么能这么说，虽然你的查询有@ID参数，但你没有在command对象中添加该参数。@Allonaz你确定你的第二个查询可以工作吗？因为我不这么认为

：）