パラメータに基づいてデータベースにレコードを挿入する次の SQL クエリがあります。うまく機能しますが、null 値は許可されず、Null がある場合はエラーが返されます。
テーブルは Null を許可するように設定されています。
SqlConnection dbconnection = new SqlConnection(@"Data Source=LEWIS;Initial Catalog=CustomPC;Integrated Security=True");
SqlCommand InsertPC = new SqlCommand("INSERT INTO [Custom_PC] ([CPU_ID], [Motherboard_ID],[Graphics_Card_ID],[PSU_ID],[RAM_ID],[Case_ID],[Primary_Storage_Drive_ID],[Secondary_Storage_Drive_ID],[Primary_Optical_Drive_ID],[Secondary_Optical_Drive_ID]) VALUES (@CPU_ID, @Motherboard_ID, @Graphics_Card_ID, @PSU_ID, @RAM_ID, @Case_ID, @Primary_Storage_Drive_ID, @Secondary_Storage_Drive_ID, @Primary_Optical_Drive_ID, @Secondary_Optical_Drive_ID) SET @ReturnedID = Scope_Identity();", dbconnection);
SqlParameter CPU_IDParam = InsertPC.Parameters.Add("@CPU_ID", SqlDbType.Int);
CPU_IDParam.Value = Session["DATA"];
SqlParameter Motherboard_IDParam = InsertPC.Parameters.Add("@Motherboard_ID", SqlDbType.Int);
Motherboard_IDParam.Value = Session["MotherboardID"];
SqlParameter Graphics_Card_IDParam = InsertPC.Parameters.Add("@Graphics_Card_ID", SqlDbType.Int);
Graphics_Card_IDParam.Value = Session["GraphicsID"];
SqlParameter PSU_IDParam = InsertPC.Parameters.Add("@PSU_ID", SqlDbType.Int);
PSU_IDParam.Value = Session["PSUID"];
SqlParameter RAM_IDParam = InsertPC.Parameters.Add("@RAM_ID", SqlDbType.Int);
RAM_IDParam.Value = Session["RAMID"];
SqlParameter Case_IDParam = InsertPC.Parameters.Add("@Case_ID", SqlDbType.Int);
Case_IDParam.Value = Session["CaseID"];
SqlParameter Primary_Storage_Drive_IDParam = InsertPC.Parameters.Add("@Primary_Storage_Drive_ID", SqlDbType.Int);
Primary_Storage_Drive_IDParam.Value = Session["HDD1ID"];
SqlParameter Secondary_Storage_Drive_IDParam = InsertPC.Parameters.Add("@Secondary_Storage_Drive_ID", SqlDbType.Int);
Secondary_Storage_Drive_IDParam.Value = Session["HDD2ID"];
SqlParameter Primary_Optical_Drive_IDParam = InsertPC.Parameters.Add("@Primary_Optical_Drive_ID", SqlDbType.Int);
Primary_Optical_Drive_IDParam.Value = Session["OpticalDrive1ID"];
SqlParameter Secondary_Optical_Drive_IDParam = InsertPC.Parameters.Add("@Secondary_Optical_Drive_ID", SqlDbType.Int);
Secondary_Optical_Drive_IDParam.Value = Session["OpticalDrive2ID"];
SqlParameter ReturnedIDParam = InsertPC.Parameters.Add("@ReturnedID", SqlDbType.Int);
ReturnedIDParam.Direction = ParameterDirection.Output;
dbconnection.Open();
InsertPC.ExecuteNonQuery();
Session["PCNum"] = (ReturnedIDParam.Value);
Response.Redirect("~/CustomPC_Details.aspx");