最简单的方法是使用第二个连接来监控进度并报告它。这里有一个小示例可以帮助您入门：
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Text;
using System.Threading.Tasks;
namespace Microsoft.Samples.SqlServer
{
public class SessionStats
{
public long Reads { get; set; }
public long Writes { get; set; }
public long CpuTime { get; set; }
public long RowCount { get; set; }
public long WaitTime { get; set; }
public string LastWaitType { get; set; }
public string Status { get; set; }
public override string ToString()
{
return $"Reads {Reads}, Writes {Writes}, CPU {CpuTime}, RowCount {RowCount}, WaitTime {WaitTime}, LastWaitType {LastWaitType}, Status {Status}";
}
}
public class SqlCommandWithProgress
{
public static async Task ExecuteNonQuery(string ConnectionString, string Query, Action<SessionStats> OnProgress)
{
using (var rdr = await ExecuteReader(ConnectionString, Query, OnProgress))
{
rdr.Dispose();
}
}
public static async Task<DataTable> ExecuteDataTable(string ConnectionString, string Query, Action<SessionStats> OnProgress)
{
using (var rdr = await ExecuteReader(ConnectionString, Query, OnProgress))
{
var dt = new DataTable();
dt.Load(rdr);
return dt;
}
}
public static async Task<SqlDataReader> ExecuteReader(string ConnectionString, string Query, Action<SessionStats> OnProgress)
{
var mainCon = new SqlConnection(ConnectionString);
using (var monitorCon = new SqlConnection(ConnectionString))
{
mainCon.Open();
monitorCon.Open();
var cmd = new SqlCommand("select @@spid session_id", mainCon);
var spid = Convert.ToInt32(cmd.ExecuteScalar());
cmd = new SqlCommand(Query, mainCon);
var monitorQuery = @"
select s.reads, s.writes, r.cpu_time, s.row_count, r.wait_time, r.last_wait_type, r.status
from sys.dm_exec_requests r
join sys.dm_exec_sessions s
on r.session_id = s.session_id
where r.session_id = @session_id";
var monitorCmd = new SqlCommand(monitorQuery, monitorCon);
monitorCmd.Parameters.Add(new SqlParameter("@session_id", spid));
var queryTask = cmd.ExecuteReaderAsync( CommandBehavior.CloseConnection );
var cols = new { reads = 0, writes = 1, cpu_time =2,row_count = 3, wait_time = 4, last_wait_type = 5, status = 6 };
while (!queryTask.IsCompleted)
{
var firstTask = await Task.WhenAny(queryTask, Task.Delay(1000));
if (firstTask == queryTask)
{
break;
}
using (var rdr = await monitorCmd.ExecuteReaderAsync())
{
await rdr.ReadAsync();
var result = new SessionStats()
{
Reads = Convert.ToInt64(rdr[cols.reads]),
Writes = Convert.ToInt64(rdr[cols.writes]),
RowCount = Convert.ToInt64(rdr[cols.row_count]),
CpuTime = Convert.ToInt64(rdr[cols.cpu_time]),
WaitTime = Convert.ToInt64(rdr[cols.wait_time]),
LastWaitType = Convert.ToString(rdr[cols.last_wait_type]),
Status = Convert.ToString(rdr[cols.status]),
};
OnProgress(result);
}
}
return queryTask.Result;
}
}
}
}
你会这样称呼它：
class Program
{
static void Main(string[] args)
{
Run().Wait();
}
static async Task Run()
{
var constr = "server=localhost;database=tempdb;integrated security=true";
var sql = @"
set nocount on;
select newid() d
into #foo
from sys.objects, sys.objects o2, sys.columns
order by newid();
select count(*) from #foo;
";
using (var rdr = await SqlCommandWithProgress.ExecuteReader(constr, sql, s => Console.WriteLine(s)))
{
if (!rdr.IsClosed)
{
while (rdr.Read())
{
Console.WriteLine("Row read");
}
}
}
Console.WriteLine("Hit any key to exit.");
Console.ReadKey();
}
}
哪些输出：
Reads 0, Writes 0, CPU 1061, RowCount 0, WaitTime 0, LastWaitType SOS_SCHEDULER_YIELD, Status running
Reads 0, Writes 0, CPU 2096, RowCount 0, WaitTime 0, LastWaitType SOS_SCHEDULER_YIELD, Status running
Reads 0, Writes 0, CPU 4553, RowCount 11043136, WaitTime 198, LastWaitType CXPACKET, Status suspended
Row read
Hit any key to exit.