Question

我试图将数据插入到我的数据库中，当我按下按钮时它应该完成但是它不会

我想这是我在查询

中的最后一层

这是我的代码

   public void InsertInventory(DateTime _date, int _customer_Id,
                            int _employee_Id, List<int> _product_Id,
                            List<int> _amountSold,
                            List<int> _unitPrice, List<int> _totalPrice)
    {
        Connection_String = @"Data Source=MOSTAFA-PC;Initial Catalog="
                           + "Sales and Inventory System"
                           + ";Integrated Security=TrueData Source=MOSTAFA-PC;Initial Catalog="
                           + "Sales and Inventory System"
                           + ";Integrated Security=True;";

        Query = "insert into Inventory" +
                  "(Customer_Id,Employee_Id,Product_Id,[Date],[Amount Sold],[Unit Price],[Total Price])" +
                    "values (@customer_id,@Employee_id,@Product_id,@[Date],@[Amount_Sold],@[Unit_Price],@[Total_Price])";

        using (Con = new SqlConnection(Connection_String))
        using (Cmd = new SqlCommand(Query, Con))
        {
            Cmd.Parameters.Add("@customer_id", SqlDbType.Int);
            Cmd.Parameters.Add("@Employee_id", SqlDbType.Int);
            Cmd.Parameters.Add("@Product_id", SqlDbType.Int);
            Cmd.Parameters.Add("@[Date]", SqlDbType.NVarChar);
            //Cmd.Parameters.Add("@[Date]", SqlDbType.Date);
            Cmd.Parameters.Add("@[Amount_sold]", SqlDbType.Int);
            Cmd.Parameters.Add("@[Unit_Price]", SqlDbType.Decimal);
            Cmd.Parameters.Add("@Total_Price", SqlDbType.Decimal);

            Cmd.Connection = Con;
            Con.Open();

            int RecordToAdd = _product_Id.Count;
            for (int i = 0; i < RecordToAdd; i++)
            {
                Cmd.Parameters["@customer_id"].Value = _customer_Id;
                Cmd.Parameters["@Employee_id"].Value = _employee_Id;
                Cmd.Parameters["@Product_id"].Value = _product_Id;
                Cmd.Parameters["@Date"].Value = _date;
                Cmd.Parameters["@Amount_sold"].Value = _amountSold;
                Cmd.Parameters["@Unit_Price"].Value = _unitPrice;
                Cmd.Parameters["@Total_Price"].Value = _totalPrice;
                Cmd.ExecuteNonQuery();
            }
        }

    }

我无法弄明白我的问题在哪里

Answer 1

问题是由您为参数设置的值引起的您应该使用索引器从列表而不是整个列表中检索元素

// These doesn't change inside the loop, so set it once for all...
Cmd.Parameters["@customer_id"].Value = _customer_Id;
Cmd.Parameters["@Employee_id"].Value = _employee_Id;
Cmd.Parameters["@Date"].Value = _date;

for (int i = 0; i < RecordToAdd; i++)
{
    Cmd.Parameters["@Product_id"].Value = _product_Id[i];
    Cmd.Parameters["@Amount_sold"].Value = _amountSold[i];
    Cmd.Parameters["@Unit_Price"].Value = _unitPrice[i];
    Cmd.Parameters["@Total_Price"].Value = _totalPrice[i];
    Cmd.ExecuteNonQuery();
}

我无法将数据插入我的数据库

1 个答案: