我有一个CSV文件，其中包含以下内容：
ProductName,EmployeeID,EmployeeName,ContactNo,Adddress
iPad,1233,Tom,89897898,34 Pitt st
iPad,1573,Jack,8978 9689,50 George st
iPad,1893,Peter,8878 8989,32 Martin st
以下代码将插入一个表中。我想要实现的是插入2个表：
Product table (parent table) ProductId(Pk), ProductName Employee Table (child table) EmployeeId(Pk), ProductId(fk), EmployeeName, ContactNo, Address
所以我需要先将记录首先插入到Product表中，然后再插入CSV文件中的Employee表。
Controller.cs
[HttpPost]
public ActionResult Index(HttpPostedFileBase FileUpload)
{
// Set up DataTable place holder
Guid ProductId= Guid.NewGuid();
using (SqlConnection conn = new SqlConnection(connString))
{
conn.Open();
using (SqlCommand cmd = new SqlCommand(
"INSERT INTO Product VALUES(" + "@ReferralListID, @ProductName)", conn))
{
//Note product name need to read from csv file
cmd.Parameters.AddWithValue("@ProductId", ProductId);
cmd.Parameters.AddWithValue("@ProductName", ProductName);
int rows = cmd.ExecuteNonQuery();
//rows number of record got inserted
}
}
DataTable dt = new DataTable();
//check we have a file
if (FileUpload.ContentLength > 0)
{
//Workout our file path
string fileName = Path.GetFileName(FileUpload.FileName);
string path = Path.Combine(Server.MapPath("~/App_Data/uploads"), fileName);
//Try and upload
try
{
FileUpload.SaveAs(path);
//Process the CSV file and capture the results to our DataTable place holder
dt = ProcessCSV(path);
//Process the DataTable and capture the results to our SQL Bulk copy
ViewData["Feedback"] = ProcessBulkCopy(dt);
}
catch (Exception ex)
{
//Catch errors
ViewData["Feedback"] = ex.Message;
}
}
else
{
//Catch errors
ViewData["Feedback"] = "Please select a file";
}
//Tidy up
dt.Dispose();
return View("Index", ViewData["Feedback"]);
}
/// <summary>
/// Process the file supplied and process the CSV to a dynamic datatable
/// </summary>
/// <param name="fileName">String</param>
/// <returns>DataTable</returns>
private static DataTable ProcessCSV(string fileName)
{
//Set up our variables
string Feedback = string.Empty;
string line = string.Empty;
string[] strArray;
DataTable dt = new DataTable();
DataRow row;
// work out where we should split on comma, but not in a sentance
Regex r = new Regex(",(?=(?:[^\"]*\"[^\"]*\")*(?![^\"]*\"))");
//Set the filename in to our stream
StreamReader sr = new StreamReader(fileName);
//Read the first line and split the string at , with our regular express in to an array
line = sr.ReadLine();
strArray = r.Split(line);
//For each item in the new split array, dynamically builds our Data columns. Save us having to worry about it.
Array.ForEach(strArray, s => dt.Columns.Add(new DataColumn()));
//Read each line in the CVS file until it's empty
while ((line = sr.ReadLine()) != null)
{
row = dt.NewRow();
//add our current value to our data row
row.ItemArray = r.Split(line);
dt.Rows.Add(row);
}
//Tidy Streameader up
sr.Dispose();
//return a the new DataTable
return dt;
}
/// <summary>
/// Take the DataTable and using WriteToServer(DataTable) send it all to the database table "BulkImportDetails" in one go
/// </summary>
/// <param name="dt">DataTable</param>
/// <returns>String</returns>
private static String ProcessBulkCopy(DataTable dt)
{
string Feedback = string.Empty;
string connString = ConfigurationManager.ConnectionStrings["DataBaseConnectionString"].ConnectionString;
//make our connection and dispose at the end
using( SqlConnection conn = new SqlConnection(connString))
{
//make our command and dispose at the end
using (var copy = new SqlBulkCopy(conn))
{
//Open our connection
conn.Open();
//Set target table and tell the number of rows
copy.DestinationTableName = "Employee";
copy.BatchSize = dt.Rows.Count;
try
{
//Send it to the server
copy.WriteToServer(dt);
Feedback = "Upload complete";
}
catch (Exception ex)
{
Feedback = ex.Message;
}
}
}
return Feedback;
}
View.aspx
<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
Home Page
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<h2>CSV Bulk Upload</h2>
<% using (Html.BeginForm("","",FormMethod.Post, new {enctype="multipart/form-data"})){ %>
<input type="file" name="FileUpload" />
<input type="submit" name="Submit" id="Submit" value="Upload" />
<% } %>
<p><%= Html.Encode(ViewData["Feedback"]) %></p>
</asp:Content>
存储过程
USE [BULkDatabase]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER OFF
GO
CREATE PROCEDURE [dbo].[InsertProdutInfo]
(
@ProductName varchar (50),
@EmployeeName varchar (50),
@EmployeeAddress varchar (50)
)
AS
BEGIN TRAN
update [dbo.Product]
set [ProductName] = @ProductName
where [ProductName] = @ProductName;
-- get product id
select ProductId = [ProductId]
from [dbo.Product]
where [ProductName] = @ProductName;
if @@rowcount = 0
BEGIN TRAN
DECLARE @ProductId uniqueidentifier
-- there's no such product, let's create it
insert into [dbo.Product]
values (NEWID(),@ProductName);
select @ProductId = SCOPE_IDENTITY()
end
-- now that we know we have added the product and have the id, let's add the rest
insert into [dbo.Employees]
values (NEWID(), @EmployeeName, @EmployeeAddress, @ProductId);
COMMIT TRAN
答案 0 :(得分：5)
首先，您应该将Controller与数据库代码分离，只需创建一个新的Class项目并在那里托管所有数据库访问权限，这样您就可以在Controller中拥有如下内容：
[HttpPost]
public ActionResult UploadFile(HttpPostedFileBase FileUpload)
{
if (FileUpload.ContentLength > 0) {
// there's a file that needs our attention
var success = db.UploadProductFile(FileUpload);
// was everything ok?
if (success)
return View("UploadSuccess");
else
return View("UploadFail");
}
return RedirectToAction("Index", new { error = "Please upload a file..." });
}
public ActionResult Index(string error)
{
...
}
这样，控制器并不真正关心你对上传的文件做了什么，因为不是Controller关注知道这样的事情，它有任务要知道它需要委派该工作并处理结果，就是这样。
请注意，操作方法名为UploadFile，而不是Index。发布相同的操作以避免在用户刷新页面时再次发布，这不是一个好习惯。
我还建议您使用 ADO.NET实体模型，在ASP.NET网站上有很多视频，它将极大地帮助您更简单地使用数据库干净的方式。
回到你的问题......在你的数据库类中，方法UploadProductFile应该是这样的，假设你没有超过200条记录来处理它，最好使用{{3}而不是花时间再次保存和阅读（更多，你应该保存文件并处理它，就像你已经做的那样）：
private bool UploadProductFile(HttpPostedFileBase FileUpload)
{
// get the file stream in a readable way
StreamReader reader = new StreamReader(FileUpload.InputStream);
// get a DataTable representing the passed string
System.Data.DataTable dt = ProcessCSV(reader.ReadToEnd());
// for each row, compose the statement
bool success = true;
foreach (System.Data.DataRow row in dt.Rows)
success = db.InsertProdutInfo(row);
return success;
}
方法InsertProdutInfo会触发memory to deal with the file，类似于：
declare @product_key int
begin tran
update [tbl_products]
set [name] = @product_name, [last_update] = getdate()
where [name] = @product_name;
-- get product id
select @product_key = [id]
from [tbl_products]
where [name] = @product_name;
if @@rowcount = 0
begin
-- there's no such product, let's create it
insert into [tbl_products] (name, last_update)
values (@product_name, getdate());
select @product_key = SCOPE_IDENTITY()
end
-- now that we know we have added the product and have the id, let's add the rest
insert into [tbl_Employees] (id, product_id, name, contact, address)
values (@employee_id, @product_key, @employee_name,
@employee_contact, @employee_address);
commit tran