sqlserver 触发器中调用clr

因为要在插入一条记录时，能立即调用c#的服务，想到用在sql中通过CLR发送socket实现。
1.socket 协议：选用udp。
2.在sqlserver的要监控的表中增加触发器，在触发器中调用CLR。这里并没有创建触发器类型的CLR，因为CLR属性里的表名总是在编译时报不能解析的错误。干脆就写一个普通的CLR函数。

1.socket server:
新建一个visual studiao的控件台项目，using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using System.Net;
using System.Net.Sockets;
using System.Threading;

namespace YLCN.Con
{
public class SocketServer
{

public void Start()
{
int recv;
byte[] data = new byte[1024];

//得到本机IP，设置TCP端口号
IPEndPoint ip = new IPEndPoint(IPAddress.Any, 8001);
Socket newsock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

//绑定网络地址
newsock.Bind(ip);

Console.WriteLine("This is a Server, host name is {0}", Dns.GetHostName());

//等待客户机连接
Console.WriteLine("Waiting for a client");

//得到客户机IP
IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
EndPoint Remote = (EndPoint)(sender);
recv = newsock.ReceiveFrom(data, ref Remote);
Console.WriteLine("Message received from {0}: ", Remote.ToString());
Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));

//客户机连接成功后，发送信息
string welcome = "你好 ! ";

//字符串与字节数组相互转换
data = Encoding.ASCII.GetBytes(welcome);

//发送信息
newsock.SendTo(data, data.Length, SocketFlags.None, Remote);
while (true)
{
data = new byte[1024];
//发送接收信息
recv = newsock.ReceiveFrom(data, ref Remote);
Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));
newsock.SendTo(data, recv, SocketFlags.None, Remote);
}
}
}

}
2.创建一个visual studio的sqlserver项目
SocketClient.cs
using System;
using System.Collections.Generic;

using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.Net.Sockets;
using System.Threading;

namespace YLCN.Con
{
public class SocketClient
{

public void Start(string msg)
{

byte[] data = new byte[1024];

//构建TCP 服务器
//Console.WriteLine("This is a Client, host name is {0}", Dns.GetHostName());

//设置服务IP，设置TCP端口号
IPEndPoint ip = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8001);

//定义网络类型，数据连接类型和网络协议UDP
Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

data = Encoding.ASCII.GetBytes(msg);
server.SendTo(data, data.Length, SocketFlags.None, ip);
IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
EndPoint Remote = (EndPoint)sender;

data = new byte[1024];
//对于不存在的IP地址，加入此行代码后，可以在指定时间内解除阻塞模式限制
int recv = server.ReceiveFrom(data, ref Remote);
//Console.WriteLine("Message received from {0}: ", Remote.ToString());
//Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));

server.Close();
}

}
}
在数据库testDB中启用CLRsp_configure 'clr enabled',1启用unsafe调用（这点非常重要，否则不能在CLR中调用socket。授权要用sysadmin权限) ALTER DATABASE TestDB set TRUSTWORTHY ON; 安装CLR CREATE ASSEMBLY [SqlServer.SqlClr.Functions]
FROM '*********\[dll名].dll'
WITH PERMISSION_SET = UNSAFE
创建触发器alter TRIGGER trg_tb_title
ON tb_Title
AFTER INSERT
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;

-- Insert statements for trigger here
DECLARE @title NVARCHAR(50)
SELECT @title=TITLE FROM inserted
select dbo.clr_HelloSqlClr(@title )

END
GO现在已开发完毕，
启动服务器端，再向表tb_Title中插入数据，可看到每插入一条，在服务端的控制台上就显示一行信息