Question

由于某种原因，我保存在一个表单中的新记录不会添加到我的数据库任何帮助谢谢你们

出现了一个我无法解决的错误

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        double addCrd;
        double addSav;
        double addHomeLoan;
        double addHomeRate;


        bool CredOK = double.TryParse(creditBox.Text, out addCrd);
        bool SavOK = double.TryParse(savingsBox.Text, out addSav);
        bool HoloOK = double.TryParse(homeLoanBalanceBox.Text, out addHomeLoan);
        bool HoRatOK = double.TryParse(homeLoanRateBox.Text, out addHomeRate);
        bool exists = false;

        foreach (Client client in records)
        {
            if (nameBox.Text == client.Name)
            {
                exists = true;
            }
        }
        try
        {
            if (YesLoanRadio.Checked)
            {
                clientTypeBox.Text = "LC";
                if (exists == false)
                {
                    if (!CredOK || !SavOK || !HoloOK || !HoRatOK)
                    {
                        MessageBox.Show("Invalid Data");
                    }
                    else
                    {
                        Client add = new LoanClient(clientTypeBox.Text,MakeID(), nameBox.Text, suburbBox.Text, addCrd, addSav, addHomeLoan, addHomeRate);
                        records.Add(add);
                        sql_1 = "INSERT INTO Client VALUES ('LC'," + "'" + (records[position] as LoanClient).ID + "'" + "," + "'" + (records[position] as LoanClient).Name + "'" + "," + "'" + (records[position] as LoanClient).Suburb + "'" + "," + "'" + (records[position] as LoanClient).CreditBalance + "'" + "," + "'" + (records[position] as LoanClient).SavingsBalance + "'" + "," + "'" + (records[position] as LoanClient).HomeLoanBalance + "'" + "," + "'" + (records[position] as LoanClient).HomeLoanInterestRate + "')";
                        showform();
                        MessageBox.Show("User Added");
                        position++;
                    }
                }
            }
            else if (NoLoanRadio.Checked)
            {
                clientTypeBox.Text = "BC";
                if (exists == false)
                {
                    if (!CredOK || !SavOK)
                    {
                        MessageBox.Show("Invalid Data");
                    }
                    else
                    {
                        Client add = new Client(clientTypeBox.Text, MakeID(), nameBox.Text, suburbBox.Text, addCrd, addSav);
                        records.Add(add);
                        sql_1 = "INSERT INTO Client VALUES ('BC', '" + records[position].ID + "'" + "," + "'" + records[position].Name + "'" + "," + "'" + records[position].Suburb + "'" + "," + "'" + records[position].CreditBalance + "'" + "," + "'" + records[position].SavingsBalance + "','','')";
                        showform();
                        MessageBox.Show("User Added");
                        position++;
                    }
                }
            }
            else
            {
                MessageBox.Show("Please Select if you have a home Loan !!!!");
            }
            try
            {
                DBQuery(sql_1);
            }
            catch (OleDbException e4)
            {
                MessageBox.Show(e4.ToString());
                records.Remove(records[position]);
                position = records.Count - 1;
            }
        }
        catch
        {
            MessageBox.Show("Invalid entry. You must enter a number value into Balance and Credit Used.");
        }

数据库查询方法是

   public void DBQuery(string sql) // changed static from public 
   {
       try
       {
           conn.Open();
           OleDbCommand cmd = new OleDbCommand(sql, conn);
           cmd.ExecuteNonQuery();

       }
       catch (OleDbException e)
       {
           MessageBox.Show(e.ToString());
       }
       conn.Close();
   }

Answer 1

尝试sql异常代码......

catch (DbUpdateException ex)
                        {
                            var sqlex = ex.InnerException.InnerException as SqlException;

                            if (sqlex != null)
                            {
                                switch (sqlex.Number)
                                {
                                    case 547: throw new ExNoExisteUsuario("No existe usuario destino."); //FK exception
                                    case 2627:
                                    case 2601:
                                        throw new ExYaExisteConexion("Ya existe la conexion."); //primary key exception

                                    default: throw sqlex; //otra excepcion que no controlo.


                                }
                            }

                            throw ex;
                        }

代码不会添加到数据库

1 个答案: