在单个方法 C# 中使用多个 sql 命令

Question

范围：学校项目使用：VS-2010，基于服务的数据库经验水平：初学者 - 仅 2 个月的基本编码

一般信息：{库存、销售、采购记录}windows（表格）具有基于服务的数据库的应用系统。

问题："In the Customer Order Info form' under method to "添加订单”我想：

将表单输入分配给变量
使用第一个reader从'Inventory details table'读取产品数量等
将数据存储在变量中
计算新库存数量和其他需要的信息
Sql 将表单输入插入 'order details table'

Sql 将新数量更新到 'Inventory details table'

  private void btnAdd_Click(object sender, EventArgs e)
{ 
    try
    {//
        //1. declare variables
        int OrderID;
        string CusName;
        string GoodsIssued = "";
        // for data entry into table
        string Entry1 = "";
        string Entry2 = "";
        string Entry3 = "";
        // for calulation of new stock level
        int ProductIDA = 0;
        int QuantityOut = 0;
        int OldQty = 0;
        int NewQty = 0;
        int ReorderLvl = 0;
        string ReorderState = "";

        //Boolean error = false;
        //2. get values from textboxes to variable
        OrderID = int.Parse(txtOrderID.Text);
        CusName = txtCustomerName.Text;
        if (rbYes.Checked == true)
        { GoodsIssued = "Yes"; }
        else if (rbNo.Checked == true)
        { GoodsIssued = "No"; }
        else { GoodsIssued = ""; } // further Error reporting possible
        /*due to complication we are compartmentalizing each iteam invoice*/
        Entry1 = txtOQty.Text + "-" + txtItemID.Text;
        Entry2 = txtOQty2.Text + "-" + txtItemID2.Text;
        Entry3 = txtOQty3.Text + "-" + txtItemID3.Text;

        //Sql instert data needs finish here
        //SQL sql Search data needs follow
        ProductIDA = int.Parse(txtItemID.Text);

        //
        //
        //

        string search = "SELECT * FROM tblInventoryDetails WHERE [Product ID] = " + ProductIDA + "";


        SqlCommand recall = new SqlCommand(search, con);
        con.Open();

        SqlDataReader reader = recall.ExecuteReader();


        while (reader.Read())// Readers need to be read using a loop!!
        {
            //string searchedId = reader[0].ToString();
            //ID  at loction 0 is ommited =can be included
            OldQty = Convert.ToInt32(reader[5]);
            ReorderLvl = Convert.ToInt32(reader[6]);
            ReorderState = reader[7].ToString();
        }
            ////////////////////////////////

        NewQty = OldQty - QuantityOut;
        if (NewQty >= ReorderLvl)   //verify syntax
        { ReorderState = "No"; }
        else { ReorderState = "Yes"; }
        con.Close();
        //3. create the query for entering new values into Order details table
        string insert = "INSERT INTO tblCustomerOrderDetails VALUES (" + OrderID + ", '" + CusName + "', '" + GoodsIssued + "', '" + Entry1 + "', '" + Entry2 + "', '" + Entry3 + "' )";
        string update = "UPDATE tblInventoryDetails SET Quantity= " + NewQty + ", [Re-Order Recommendation]='" + ReorderState + "' WHERE [Product ID] =" + ProductIDA;
        //4. Creating the sql command with query name and connection
        SqlCommand cmdInsert = new SqlCommand(insert, con);
        SqlCommand cmdUpdate = new SqlCommand(update, con);
        //5. Opening connection path
        con.Open();
        //6. Executing the command
        cmdInsert.ExecuteNonQuery();
        cmdUpdate.ExecuteNonQuery();
        //7.Display message if these try is sucessful
        MessageBox.Show("Updated and Saved Sucessfully");
    }// close of try 
    catch (Exception ex)
    {   //8. display error message when its not sucessful
        MessageBox.Show("Error while saving" + ex);
    }// close of catch
    finally
    {  //9.Close the connection
        con.Close();
    }// close of finally
    //
}

这是订单详情表格： OrderDetails

更新问题：当运行时，我希望在 InventoryDetails table 中更新数量和重新订购建议的新值的查询的更新部分似乎没有通过。其他一切似乎工作正常。谁能指出我的错误或告诉我为什么 Update 函数似乎没有运行?

观察：是不是因为这是这个连接的第二个[ExecuteNonQuery()]？

提前致谢

Answer 1

在您的 Insert-Statement 中，Entry3 没有引号。

在单个方法 C# 中使用多个 sql 命令

Using multiple sql commands in a single method C#

c#

sql-server

visual-studio-2010