c# mysql sdr_c# 实时监控数据库 SqlDependency

http://blog.csdn.net/idays021/article/details/49661855

class Program

{

private static string _connStr;

static void Main(string[] args)

{

_connStr = ConfigurationManager.ConnectionStrings["plmConnectionString"].ToString();

SqlDependency.Start(_connStr);//传入连接字符串,启动基于数据库的监听

UpdateGrid();

Console.Read();

}

private static void UpdateGrid()

{

using (SqlConnection connection = new SqlConnection(_connStr))

{

//依赖是基于某一张表的,而且查询语句只能是简单查询语句,不能带top或*,同时必须指定所有者,即类似[dbo].[]，如果where条件存在datetime类型，就会导致一直触发onChange事件

using (SqlCommand command = new SqlCommand("select id,machine,jobNo From [dbo].[plm_Issue]", connection))

{

command.CommandType = CommandType.Text;

connection.Open();

SqlDependency dependency = new SqlDependency(command);

dependency.OnChange += new OnChangeEventHandler(dependency_OnChange);

SqlDataReader sdr = command.ExecuteReader();

Console.WriteLine();

while (sdr.Read())

{

Console.WriteLine("id:{0}\t machine:{1}\t jobNo:{2}", sdr["id"].ToString(), sdr["machine"].ToString(),

sdr["jobNo"].ToString());

}

sdr.Close();

}

}

}

private static void dependency_OnChange(object sender, SqlNotificationEventArgs e)

{

SqlDependency dependency = sender as SqlDependency;

dependency.OnChange -= dependency_OnChange;

if (e.Info != SqlNotificationInfo.Invalid)

{

UpdateGrid();//此处需重复注册SqlDependency，每次注册只执行一次，SqlDependency.id可用用于验证注册唯一 编号

}

}

}

在数据库执行如下sql 语句

ALTER DATABASE 数据库名称 SET NEW_BROKER WITH ROLLBACK IMMEDIATE;

ALTER DATABASE 数据库名称 SET ENABLE_BROKER;