目录
认识EF
添加数据
删除数据
修改数据
查询数据
总结
认识EF
ADO.NET Entity Framework 是微软以ADO.NET为基础所发展出来的对象关系对伊（O/R Mapping）解决方案，早起被称为ObjectSpage，最新版本EF6。
实体框架Entity Framework是ADO.NET中的一组支持面向数据的软件应用程序的技术。是微软的一个ORM框架。
什么是O/R Mapping
广义上，ORM指的是面向对象模型和关系数据库的数据结构之间的相互转换。
狭义上，ORM可以被认为是，基于关系数据库的数据存储，实现一个虚拟的面向对象的数据访问接口。理想情况下，基于这样一个面向对象的接口，持久化一个OO对象应该不需要了解任何关系型数据存储数据的实现细节。
添加数据
测试用数据库
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的时候发现，跟之前的版本差别还是挺大的，有些方法的名字都改了。这里记录一下，使用的时候方便查找吧。
测试页面
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>用户名：</td>
17 <td>
18 <asp:TextBox runat="server" ID="txtUserName" ClientIDMode="Static" /></td>
19 </tr>
20 <tr>
21 <td>用户地址：</td>
22 <td>
23 <asp:TextBox runat="server" ID="txtAddress" ClientIDMode="Static" /></td>
24 </tr>
25 <tr>
26 <td>性别：</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>序号</th>
38 <th>用户名</th>
39 <th>地址</th>
40 <th>性别</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="编辑" runat="server" OnClick="lnkEdit_Click" CommandName="Edit" CommandArgument=‘<%#Eval("ID") %>‘ ID="lnkEdit" /><asp:LinkButton Text="删除" 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
增加用户
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 }
删除数据
1 shopEntities.TB_Customer.Remove(tb_Customer);
2 if (shopEntities.SaveChanges() > 0)
3 {
4 this.DataInit();
5 }
修改数据
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 //将 对象 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语句到数据库执行 13 shopEntities.SaveChanges();
查询数据
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 }
总结
新技术更新可真快，这里只是记录增删改查的方法，也没具体描述，只是影响中感觉跟ef4差别很大。这里记录一下，使用起来的时候，希望能快速上手。
时间： 2024-08-06 11:51:26