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WCF事务应用[转]

2015-06-30 14:20 267 查看
在B2B的项目中,一般用户注册后,就有一个属于自己的店铺,此时,我们就要插入两张表, User和Shop表。

当然,要么插入成功,要么全失败。

第一步: 首先看一下项目的结构图:



第二步: 准备工作,我们新建Commerce数据库,用EF去映射,然后新建ServiceWCF类库,具体步骤就省略,

这一块不懂可以留言。



第三步:新建一个Model类库。建立两个实体类Shop和User,当然自定义类型在WCF中传输,

必须在类上加上【DataContract】,属性上加【DataMember】。

Shop.cs



1 namespace Model
2 {
3     [DataContract]
4     public class Shop
5     {
6         [DataMember]
7         public int ShopID { get; set; }
8
9         [DataMember]
10         public int UserID { get; set; }
11
12         [DataMember]
13         public string ShopName { get; set; }
14
15         [DataMember]
16         public string ShopUrl { get; set; }
17
18     }
19 }




User.cs



1 namespace Model  2 {  3     [DataContract]  4     public class User  5     {  6         [DataMember]  7         public int UserID { get; set; }  8   9         [DataMember] 10         public string UserName { get; set; } 11  12         [DataMember] 13         public string Password { get; set; } 14     } 15 }




第四步:然后在ServiceWCF类库中新建两个文件Seller.cs 和 ISeller.cs.

ISeller.cs:



1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Runtime.Serialization;
5 using System.ServiceModel;
6 using System.Text;
7
8 namespace ServiceWCF
9 {
10     [ServiceContract]
11     public interface ISeller
12     {
13         [OperationContract(Name = "AddUser")]
14         bool Add(Model.User user, out int userID);
15
16         [OperationContract(Name = "AddShop")]
17         bool Add(Model.Shop shop, out int shopID);
18
19         [OperationContract]
20         bool Add(Model.User user, Model.Shop shop);
21     }
22 }




Seller.cs



1 namespace ServiceWCF  2 {  3     public class Seller : ISeller  4     {  5         ///<summary>  6 /// User的插入操作  7 ///</summary>  8 ///<param name="user"></param>  9 ///<param name="userID"></param> 10 ///<returns></returns> 11         public bool Add(Model.User user, out int userID) 12         { 13             using (CommerceEntities db = new CommerceEntities()) 14             { 15                 try 16                 { 17                     User userModel = new User() 18                     { 19                         UserName = user.UserName, 20                         Passwrod = user.Password 21                     }; 22  23                     db.User.AddObject(userModel); 24  25                     db.SaveChanges(); 26  27                     userID = userModel.UserID; 28  29                     return true; 30                 } 31                 catch (Exception) 32                 { 33                     userID = 0; 34                     throw; 35                 } 36             } 37         } 38  39         ///<summary> 40 /// Shop的插入操作 41 ///</summary> 42 ///<param name="shop"></param> 43 ///<param name="shopID"></param> 44 ///<returns></returns> 45         public bool Add(Model.Shop shop, out int shopID) 46         { 47             using (CommerceEntities db = new CommerceEntities()) 48             { 49                 try 50                 { 51  52                     Shop shopModel = new Shop() 53                           { 54                               ShopName = shop.ShopName, 55                               ShopUrl = shop.ShopUrl, 56                               UserID = shop.UserID 57                           }; 58  59                     db.Shop.AddObject(shopModel); 60  61                     db.SaveChanges(); 62  63                     shopID = shopModel.ShopID; 64  65                     return true; 66                 } 67                 catch (Exception) 68                 { 69                     shopID = 0; 70                     throw; 71                 } 72             } 73         } 74  75 ///<summary> 76 /// User,Shop的插入的操作 77 ///</summary> 78 ///<param name="user"></param> 79 ///<param name="shop"></param> 80 ///<returns></returns>

81         [OperationBehavior(TransactionScopeRequired = true, TransactionAutoComplete = true)] 82         public bool Add(Model.User user, Model.Shop shop) 83         { 84             int shopID; 85             int UserID; 86  87             //注意,这个方法操作了两个数据库实例,为AddUser和AddShop。所以晋升为分布式事务 88             if (Add(user, out  UserID)) 89             { 90                 shop.UserID = UserID; 91  92                 return Add(shop, out shopID); 93             } 94  95             return false; 96         } 97     } 98 }




TransactionScopeRequired: 告诉ServiceHost自托管服务,进入我的方法,必须给我加上事务。

TransactionAutoComplete: 方法执行中,如果没有抛出异常,则自动提交。

第五步: 新建Host来承载了,配置AppConfig,这些细节就不再说了。



1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5
6 namespace ServiceHost
7 {
8     class Program
9     {
10         static void Main(string[] args)
11         {
12             System.ServiceModel.ServiceHost host = new System.ServiceModel.ServiceHost(typeof(ServiceWCF.Seller));
13
14             host.Open();
15
16             Console.WriteLine("WCF 服务已经开启!");
17
18             Console.Read();
19         }
20     }
21 }






1 <?xml version="1.0" encoding="utf-8"?>  2 <configuration>  3   <system.web>  4     <compilation debug="true" />  5   </system.web>  6   <!-- 部署服务库项目时,必须将配置文件的内容添加到   7   主机的 app.config 文件中。System.Configuration 不支持库的配置文件。-->  8   <system.serviceModel>  9     <services> 10       <service name="ServiceWCF.Seller"> 11         <endpoint address="" binding="wsHttpBinding" contract="ServiceWCF.ISeller"> 12           <identity> 13             <dns value="localhost" /> 14           </identity> 15         </endpoint> 16         <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" /> 17         <host> 18           <baseAddresses> 19             <add baseAddress="http://localhost:8732/Seller/" /> 20           </baseAddresses> 21         </host> 22       </service> 23     </services> 24     <behaviors> 25       <serviceBehaviors> 26         <behavior> 27           <!-- 为避免泄漏元数据信息, 28           请在部署前将以下值设置为 false 并删除上面的元数据终结点  --> 29           <serviceMetadata httpGetEnabled="True" /> 30           <!-- 要接收故障异常详细信息以进行调试, 31           请将以下值设置为 true。在部署前设置为 false  32             以避免泄漏异常信息--> 33           <serviceDebug includeExceptionDetailInFaults="False" /> 34         </behavior> 35       </serviceBehaviors> 36     </behaviors> 37   </system.serviceModel> 38   <connectionStrings> 39     <add name="CommerceEntities" connectionString="metadata=res://*/Commerce.csdl|res://*/Commerce.ssdl|res://*/Commerce.msl;provider=System.Data.SqlClient;provider connection string="Data Source=VONXCEVF0IT7JDJ;Initial Catalog=Commerce;Integrated Security=True;MultipleActiveResultSets=True"" providerName="System.Data.EntityClient" /> 40   </connectionStrings> 41 </configuration>




第六步:开启WCF服务,新建ServiceClient类库,然后用信道生成实例。



1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5 using System.ServiceModel;
6 using ServiceWCF;
7
8 namespace ServiceClient
9 {
10     class Program
11     {
12         static void Main(string[] args)
13         {
14             var user = new Model.User()
15             {
16                 UserName = "huangxincheng520",
17                 Password = "i can fly"
18             };
19
20             var shop = new Model.Shop()
21             {
22                 ShopName = "shopex",
23                 ShopUrl = "http://www.shopex.cn"
24             };
25
26             var factory = new ChannelFactory<ISeller>(new WSHttpBinding(),

new EndpointAddress("http://localhost:8732/Seller/"));
27
28             var client = factory.CreateChannel();
29
30             if (client.Add(user, shop))
31                 Console.WriteLine("huangxincheng520, 恭喜你,数据插入成功。");
32             else
33                 Console.WriteLine("huangxincheng520, 呜呜,数据插入失败。");
34
35             Console.Read();
36         }
37     }
38 }




最后就是测试了:

首先:走正常流程。client.Add方法调用服务器端,运行效果如图所示:



是的,数据已经正常插入成功,对Client端而言,这个操作是透明的。

然后: 我们在Seller类中的Add方法中故意加入异常。看效果咋样。



1   ///<summary>  2 /// User,Shop的插入的操作  3 ///</summary>  4 ///<param name="user"></param>  5 ///<param name="shop"></param>  6 ///<returns></returns>  7         [OperationBehavior(TransactionScopeRequired = true, TransactionAutoComplete = true)]  8         public bool Add(Model.User user, Model.Shop shop)  9         { 10             int shopID; 11             int UserID; 12              13             if (Add(user, out  UserID)) 14             { 15                 //注意注意,我在Adduser成功的情况下,抛出异常,看是否回滚。 16                 throw new Exception(); 17  18                 shop.UserID = UserID; 19  20                 return Add(shop, out shopID); 21             } 22  23             return false; 24         }




截图如下:



哈哈,抛出异常了,我的Exception起到效果了,再来看一下数据库。大家都知道会发生什么了,对的,异常不再产生数据了,

还是先前产生了那条数据,说明起到效果了。

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