利用Socket监听SqlServer数据库的变化，并推送消息到客户端

新建一个SQL CLR数据库项目，来对数据库的变化进行监听，如：当有数据发生变化（增删改）， SQL CLR数据库项目就会获得通知，此时我们在开启一个Socket，将数据库变化的消息发送到IIS服务器，IIS服务器然后再发布出数据库已发送变化的消息，此时连接到服务器的客户端就会收到通知，就会根据服务器发来的表名，去决定是否需要重新获取数据，已达到客户端的数据是实时数据的效果：

第一步：

 

第二：

 

using System;

using System.Data;

using System.Data.SqlClient;

using Microsoft.SqlServer.Server;

using System.Text.RegularExpressions;

using System.Web.Services;

using System.Net.Sockets;

using System.Threading;

using System.Net;

using System.Text;

using System.Collections.Generic;

using System.Runtime.Remoting.Contexts;

 

 

public partial class Triggers

{

 // 为目标输入现有表或视图并取消对特性行的注释

 [Microsoft.SqlServer.Server.SqlTrigger(Name = "Trigger1", Target = "Users", Event = "AFTER INSERT, UPDATE")]

 public static void Trigger1()

 {

 

 SqlContext.Pipe.Send("hehuajun");

 List socketPool = new List();

 

 bool firstTime = true;

 

 SqlTriggerContext triggContext = SqlContext.TriggerContext;

 SqlParameter userName = new SqlParameter("@username", System.Data.SqlDbType.NVarChar);

 

 if (triggContext.TriggerAction == TriggerAction.Insert)

 {

 using (SqlConnection conn = new SqlConnection("context connection=true"))

 {

 conn.Open();

 SqlCommand sqlComm = new SqlCommand();

 SqlPipe sqlP = SqlContext.Pipe;

 

 sqlComm.Connection = conn;

 sqlComm.CommandText = "SELECT UserName from INSERTED";

 userName.Value = sqlComm.ExecuteScalar().ToString();

 sqlComm.CommandText = "INSERT UsersAudit(UserName) VALUES('" + userName + "')";

 sqlP.Send(sqlComm.CommandText);

 sqlP.ExecuteAndSend(sqlComm);

 Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

 IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("192.168.10.11"), 4502); //填写自己电脑的IP或者其他电脑的IP，如果是其他电脑IP的话需将ConsoleApplication_socketServer工程放在对应的电脑上。

 SqlServerProjectDemo.TableNotifyProtocol p = new SqlServerProjectDemo.TableNotifyProtocol();

 p.TableName = "Users";

 p.OperatorOnTable = "Update";

 socket.Connect(ipep);

 socket.Send(p.TableNotifyProtocolToBytes());

 socket.Close();

 }

 }

 }

 

 //static Socket serverSocket;

 

 // static Socket clientSocket;

 

 // static Thread thread;

 

 //public static void StartSocket()

 //{

 

 // IPEndPoint ipep = new IPEndPoint(IPAddress.Any, 4530);

 

 // serverSocket = new Socket(ipep.AddressFamily, SocketType.Stream, ProtocolType.Tcp);

 

 // serverSocket.Bind(ipep);

 

 // serverSocket.Listen(10);

 

 // while (true)

 // {

 // Socket s = serverSocket.Accept();

 // socketPool.Add(s);

 // // clientSocket = s;

 // // thread = new Thread(new ThreadStart(doWork));

 // thread = new Thread(new ThreadStart(() =>

 // {

 // doWork(s, ASCIIEncoding.ASCII.GetBytes("1"));

 // }));

 // thread.Start();

 

 // }

 //}

 

 

 //public static void doWork(Socket s, byte[] buffer)

 //{

 // // Socket s = clientSocket;//客户端信息

 // IPEndPoint ipEndPoint = (IPEndPoint)s.RemoteEndPoint;

 

 // String address = ipEndPoint.Address.ToString();

 

 // String port = ipEndPoint.Port.ToString();

 

 // Console.WriteLine(address + ":" + port + " 连接过来了");

 

 // Byte[] inBuffer = new Byte[1024];

 

 // Byte[] outBuffer = new Byte[1024];

 

 // String inBufferStr;

 

 // String outBufferStr;

 

 // try

 // {

 

 // while (true)

 // {

 

 // // s.Receive(inBuffer, 1024, SocketFlags.None);//如果接收的消息为空 阻塞 当前循环

 

 // // inBufferStr = Encoding.ASCII.GetString(inBuffer);

 

 // // Console.WriteLine(address + ":" + port + "说:");

 

 // // Console.WriteLine(inBufferStr);

 

 // //// outBufferStr = Console.ReadLine();

 

 // // //outBufferStr = p.TableNotifyProtocolToBytes();

 // // //outBuffer = Encoding.ASCII.GetBytes(outBufferStr);

 // // outBuffer = p.TableNotifyProtocolToBytes();

 // s.Send(buffer, buffer.Length, SocketFlags.None);

 // }

 // }

 

 // catch

 // {

 // Console.WriteLine("客户端已关闭！");

 // }

 

 //}

 

 public bool IsEMailAddress(string s)

 {

 return Regex.IsMatch(s, "^([\w-]+\.)*?[\w-]+@[\w-]+\.([\w-]+\.)*?[\w]+$");

 }

 

}

 

 

第三步：为了能使用Socket，需要为程序集签名：

第四步：

 

在数据库中执行：

 

USE master

 CREATE ASYMMETRIC KEY SQLCLRTestKey1

 

 FROM EXECUTABLE FILE = 'C:SqlServerProjectDemo.dll'

 

 

CREATE LOGIN SQLCLRTestLogin FROM ASYMMETRIC KEY SQLCLRTestKey

 GRANT EXTERNAL ACCESS ASSEMBLY TO SQLCLRTestLogin;

GO

 

注意：最好不要直接使用debug目录，可以将你的项目生成的dll拷贝到另外的地方。如：C:SqlServerProjectDemo.dll

 

F5启动部署：

成功后：

在数据库中执行

 

insert into Users(UserName,Pass) values('admin','admin')

 

Update Users set UserName='哈哈哈' where UserName='admin'

 

然后在你的Socket端的服务器上就会收到 你发送过去的数据。

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

 

namespace SqlServerProjectDemo

{

 

 public struct TableNotifyProtocol

 {

 public string TableName;

 public string OperatorOnTable;

 public byte[] TableNotifyProtocolToBytes()

 {

 string s = "TableName=" + TableName + "|" + "OperatorOnTable=" + OperatorOnTable+"|";

 

 byte[] bTableName = ASCIIEncoding.ASCII.GetBytes(TableName);

 byte[] bOperatorOnTable = ASCIIEncoding.ASCII.GetBytes(OperatorOnTable);

 //byte[] buffer = new byte[bTableName.Length + bOperatorOnTable.Length];

 //ASCIIEncoding.ASCII.GetBytes(TableName, 0, bTableName.Length, buffer, 0);

 //ASCIIEncoding.ASCII.GetBytes(OperatorOnTable, 0, bOperatorOnTable.Length, buffer, bTableName.Length);

 

 byte[] buffer = ASCIIEncoding.ASCII.GetBytes(s);

 

 return buffer;

 }

 public TableNotifyProtocol GetModel(byte[] buffer)

 {

 string s = ASCIIEncoding.ASCII.GetString(buffer);

 TableNotifyProtocol model = new TableNotifyProtocol();

 model.OperatorOnTable = GetString(s, "OperatorOnTable");

 model.TableName = GetString(s, "TableName");

 return model;

 }

 private string GetString(string s,string key)

 {

 string tmp = s.Substring(s.IndexOf(key) + key.Length + 1);

 string v=tmp.Substring(0,tmp.IndexOf("|"));

 return v;

 }

 }

 

 

}