[EF]使用EF簡單增刪改查

本文轉載自查看原文 2014-07-29 20:12 5688 EF5/ [ORM]NHibernate&&EF

認識EF

ADO.NET Entity Framework 是微軟以ADO.NET為基礎所發展出來的對象關系對伊（O/R Mapping）解決方案，早起被稱為ObjectSpage，最新版本EF6。

實體框架Entity Framework是ADO.NET中的一組支持面向數據的軟件應用程序的技術。是微軟的一個ORM框架。

什么是O/R Mapping

廣義上，ORM指的是面向對象模型和關系數據庫的數據結構之間的相互轉換。

狹義上，ORM可以被認為是，基於關系數據庫的數據存儲，實現一個虛擬的面向對象的數據訪問接口。理想情況下，基於這樣一個面向對象的接口，持久化一個OO對象應該不需要了解任何關系型數據存儲數據的實現細節。

添加數據

測試用數據庫

 1 USE [Wolfy.Shop]
 2 GO
 3 
 4 /****** Object:  Table [dbo].[TB_Customer]    Script Date: 2014/7/29 20:01:56 ******/
 5 SET ANSI_NULLS ON
 6 GO
 7 
 8 SET QUOTED_IDENTIFIER ON
 9 GO
10 
11 CREATE TABLE [dbo].[TB_Customer](
12     [ID] [uniqueidentifier] NOT NULL,
13     [Name] [nvarchar](32) NULL,
14     [Address] [nvarchar](100) NULL,
15     [Gender] [bit] NULL,
16  CONSTRAINT [PK_CustomerID] PRIMARY KEY CLUSTERED 
17 (
18     [ID] ASC
19 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
20 ) ON [PRIMARY]
21 
22 GO

TB_Customer

 1 USE [Wolfy.Shop]
 2 GO
 3 
 4 /****** Object:  Table [dbo].[TB_Order]    Script Date: 2014/7/29 20:02:47 ******/
 5 SET ANSI_NULLS ON
 6 GO
 7 
 8 SET QUOTED_IDENTIFIER ON
 9 GO
10 
11 CREATE TABLE [dbo].[TB_Order](
12     [ID] [int] NOT NULL,
13     [OrderName] [nvarchar](1000) NULL,
14     [CreateDate] [datetime] NULL,
15     [customerId] [uniqueidentifier] NULL,
16  CONSTRAINT [PK_TB_Order] PRIMARY KEY CLUSTERED 
17 (
18     [ID] ASC
19 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
20 ) ON [PRIMARY]
21 
22 GO
23 
24 ALTER TABLE [dbo].[TB_Order]  WITH CHECK ADD  CONSTRAINT [FK_Customer_Order] FOREIGN KEY([customerId])
25 REFERENCES [dbo].[TB_Customer] ([ID])
26 GO
27 
28 ALTER TABLE [dbo].[TB_Order] CHECK CONSTRAINT [FK_Customer_Order]
29 GO

TB_Order

工具VS2013,SQL SERVER2012
在使用EF的時候發現，跟之前的版本差別還是挺大的，有些方法的名字都改了。這里記錄一下，使用的時候方便查找吧。

測試頁面

 1 <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="AddCustomer.aspx.cs" Inherits="Wofly.EFDemo.AddCustomer" %>
 2 
 3 <!DOCTYPE html>
 4 
 5 <html xmlns="http://www.w3.org/1999/xhtml">
 6 <head runat="server">
 7     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 8     <title></title>
 9 </head>
10 <body>
11     <form id="form1" runat="server">
12         <div>
13             <asp:Button Text="添加" CommandArgument="add" runat="server" ID="btnAdd" OnClick="btnAdd_Click" />
14             <table>
15                 <tr>
16                     <td>用戶名：</td>
17                     <td>
18                         <asp:TextBox runat="server" ID="txtUserName" ClientIDMode="Static" /></td>
19                 </tr>
20                 <tr>
21                     <td>用戶地址：</td>
22                     <td>
23                         <asp:TextBox runat="server" ID="txtAddress" ClientIDMode="Static" /></td>
24                 </tr>
25                 <tr>
26                     <td>性別：</td>
27                     <td>
28                         <asp:RadioButton runat="server" Checked="true" ID="rdbMan" Text="男" GroupName="gender" />
29                         <asp:RadioButton GroupName="gender" runat="server" ID="rdbFemale" Text="女" />
30                     </td>
31                 </tr>
32             </table>
33             <asp:Repeater runat="server" ID="rptCustomerList">
34                 <HeaderTemplate>
35                     <table>
36                         <tr>
37                             <th>序號</th>
38                             <th>用戶名</th>
39                             <th>地址</th>
40                             <th>性別</th>
41                             <th>操作</th>
42                         </tr>
43                 </HeaderTemplate>
44                 <ItemTemplate>
45                     <tr>
46                         <td><%#Container.ItemIndex+1 %></td>
47                         <td><%#Eval("Name") %></td>
48                         <td><%#Eval("Address") %></td>
49                         <td><%#Convert.ToBoolean(Eval("Gender"))==true?"男":"女" %></td>
50                         <td>
51                             <asp:LinkButton Text="編輯" runat="server" OnClick="lnkEdit_Click" CommandName="Edit" CommandArgument='<%#Eval("ID") %>' ID="lnkEdit" /><asp:LinkButton Text="刪除" runat="server" OnClick="lnkEdit_Click" ID="lnkDelete" CommandName="Delete" CommandArgument='<%#Eval("ID") %>' /></td>
52                     </tr>
53                 </ItemTemplate>
54                 <FooterTemplate>
55                     </table>
56                 </FooterTemplate>
57             </asp:Repeater>
58         </div>
59     </form>
60 </body>
61 </html>

AddCustomer.aspx

增加用戶

1                ShopEntities shopEntities = new ShopEntities();
2                 TB_Customer tb_CustomerAdd = new TB_Customer() { ID = Guid.NewGuid(), Name = txtUserName.Text, Address = txtAddress.Text, Gender = rdbMan.Checked ? true : false };
3                 shopEntities.TB_Customer.Add(tb_CustomerAdd);
4                 int intResult = shopEntities.SaveChanges();
5                 if (intResult > 0)
6                 {
7                     DataInit();
8                 }

刪除數據

1                    shopEntities.TB_Customer.Remove(tb_Customer);
2                     if (shopEntities.SaveChanges() > 0)
3                     {
4                         this.DataInit();
5                     }

修改數據

 1                 ShopEntities shopEntities = new ShopEntities();
 2                 var customer = from c in shopEntities.TB_Customer
 3                                where c.ID == new Guid(btn.CommandArgument)
 4                                select c;
 5                 TB_Customer tb_CustomerUpdate = customer.FirstOrDefault<TB_Customer>();
 6                 //將 對象 添加到 EF中   
 7                 tb_CustomerUpdate.Name = txtUserName.Text;
 8                 tb_CustomerUpdate.Address = txtAddress.Text;
 9                 tb_CustomerUpdate.Gender = rdbMan.Checked ? true : false;
10                 //是否修改
11                 shopEntities.Entry<TB_Customer>(tb_CustomerUpdate).State = System.Data.EntityState.Modified;
12                 //一次性 生成sql語句到數據庫執行            
13                 shopEntities.SaveChanges();

查詢數據

1         private void DataInit()
2         {
3             ShopEntities shopEntities = new ShopEntities();
4             var customers = from c in shopEntities.TB_Customer
5                             select c;
6             this.rptCustomerList.DataSource = customers.ToList();
7             this.rptCustomerList.DataBind();
8         }

總結

新技術更新可真快，這里只是記錄增刪改查的方法，也沒具體描述，只是影響中感覺跟ef4差別很大。這里記錄一下，使用起來的時候，希望能快速上手。

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