Web API 在使用几天后总是无法连接到 MYSQL 数据库
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【中文标题】Web API 在使用几天后总是无法连接到 MYSQL 数据库【英文标题】：Web API always can't connect to MYSQL db after using some days later 【发布时间】：2021-12-03 07:56:20 【问题描述】：我有一个Web API，它工作了大约 20 天后无法连接到该mysql 服务器，因为它恢复正常我必须重新启动服务器，这真的很奇怪，我试图使用其他工具包（例如navicat）连接到MYSQL 服务器，在它无法连接到该数据库时，它无法正常工作，它只是无法连接到显示状态代码的MySQL 数据库，例如S1000 或@ 987654325@(我试着用谷歌搜索那个代码，它不起作用，我不知道如何处理这个问题)
我的 Web API 在 VS 2015 上使用 EF 5.0、.NET 4.6 构建在 C# 中。我将它部署在 Windows 2008 R2 服务器上，此 Web 服务器上的 IIS 上有 3 个 Web api，还有一个 Windows 2008 R2 服务器，它有 MySQL 服务器，版本是 5.5，因为我是只是开发人员，我只是在 web 服务器级别记录异常，我试图在 MySQL 端找到日志文件，DBA 没有在该数据库上记录任何文件，这真的很不幸。
这是我的控制器代码
public DMLjfretModels uploadjfdetails(DMLjfparamsModels dmlparms)
DMLjfretModels dmlret = new Models.DMLjfretModels();
dmlret.returncode = 0;
dmlret.expmsg = "";
if (dmlparms.clicardjftype != "1" && dmlparms.clicardjftype != "2" && dmlparms.clicardjftype != "4")
dmlret.returncode = -30;
return dmlret;
if ((dmlparms.clicard??"").Trim().Length != 10)
dmlret.returncode = -60;
dmlret.expmsg = "cardno is invald";
return dmlret;
try
using (var context = new testEntities())
context.Database.CommandTimeout = 180;
if (ModelState.IsValid)
Globalvariable glv = new Globalvariable();
int result = glv.validate(dmlparms.username, dmlparms.password, dmlparms.curno);
if (result!=0)
dmlret.returncode = result;
return dmlret;
string clicardstring = dmlparms.clicard.Trim();
var memberresult = context.wp_client_card.Where(x => x.cli_card == clicardstring);
int therecordscount = memberresult.Count();
try
string filePath = @"d:\\log\\lognumber" + DateTime.Now.ToString("yyyy-MM-dd") + ".txt";
using (StreamWriter writer = new StreamWriter(filePath, true))
writer.WriteLine("cli_card:" + clicardstring ?? "" + ",listno:" + dmlparms.clicardjflistno ?? "" + ",countvalue:" + therecordscount.ToString());
writer.WriteLine(Environment.NewLine + "-----------------------------------------------------------------------------" + Environment.NewLine);
catch (Exception ex)
string filePath = @"d:\\log\\Error" + DateTime.Now.ToString("yyyy-MM-dd") + ".txt";
using (StreamWriter writer = new StreamWriter(filePath, true))
writer.WriteLine("Message :" + ex.Message + "<br/>" + Environment.NewLine + "StackTrace :" + ex.StackTrace +
"" + Environment.NewLine + "Date :" + DateTime.Now.ToString());
writer.WriteLine(Environment.NewLine + "-----------------------------------------------------------------------------" + Environment.NewLine);
if (therecordscount == 0)
dmlret.returncode = -25;
return dmlret;
if (dmlparms.clicardjftype== "1" || dmlparms.clicardjftype == "2")
foreach (DMLdetailModels dm in dmlparms.clidetails)
if (string.IsNullOrEmpty(dm.prodno) || string.IsNullOrEmpty(dm.batchno)
|| string.IsNullOrEmpty(dm.prodadd) || dm.prodnum <= 0.0 || dm.sellprice <= 0.0
|| dm.stdprice <= 0.0 || dm.clicardjfnum<=0.0)
dmlret.returncode = -33;
return dmlret;
else
decimal thesum = context.wp_cli_card_jf.Where(x => x.cli_card==dmlparms.clicard.Trim())
.Sum(
d =>
((d.cli_card_jf_type == "1") && (d.cli_card_jf_num != null))
? d.cli_card_jf_num
: ((d.cli_card_jf_type == "2") && (d.cli_card_jf_num != null))
? ((Decimal?)((Decimal)0) - d.cli_card_jf_num)
: ((d.cli_card_jf_type == "4") && (d.cli_card_jf_num != null))
? ((Decimal?)((Decimal)0) - d.cli_card_jf_num)
: (Decimal?)((Decimal)0)
)??0.0M;
decimal thesumjf = 0.0M;
foreach(DMLdetailModels details in dmlparms.clidetails)
thesumjf = thesumjf + Convert.ToDecimal( details.clicardjfnum);
if (thesum< thesumjf)
dmlret.returncode = -50;
return dmlret;
foreach (DMLdetailModels detail in dmlparms.clidetails)
//write the data into my database
context.wp_cli_card_jf.Add(wjf);
context.SaveChanges();
return dmlret;
else
dmlret.returncode = -20;
return dmlret;
catch (Exception ex)
logfile(ex);
顺便说一句，我也在 webapi 中记录了请求和响应
public class LogRequestAndResponseHandler : DelegatingHandler
protected override async Task<HttpResponseMessage> SendAsync(
HttpRequestMessage request, CancellationToken cancellationToken)
String UUID = Guid.NewGuid().ToString();
// log request body
string requestBody = await request.Content.ReadAsStringAsync();
string requestmethod = request.RequestUri.ToString();
string mymethod = requestmethod.ToLower();
// let other handlers process the request
var result = await base.SendAsync(request, cancellationToken);
if (result.Content != null)
// once response body is ready, log it
var responseBody = await result.Content.ReadAsStringAsync();
logrequestnresponse(UUID, requestBody, responseBody.ToString(), mymethod);
return result;
private void logrequestnresponse(string uuid, string requestbody, string responsebody,string requestmethod)
try
using (var context = new testEntities())
context.Database.CommandTimeout = 180;
wp_web_api_log wplog = context.wp_web_api_log.Create();
wplog.row_index = uuid;
wplog.request_detail = requestbody;
wplog.request_url = requestmethod;
wplog.response_detail = responsebody;
context.wp_web_api_log.Add(wplog);
context.SaveChanges();
string filePath = @"d:\\log\\Logfile.txt";
catch (Exception ex)
logfile(ex);
我的日志文件记录了在那段时间它无法连接到 MYSQL 数据库
Message :The underlying provider failed on Open<br/>
StackTrace : at System.Data.Entity.Core.EntityClient.EntityConnection.Open()
at System.Data.Entity.Core.Objects.ObjectContext.EnsureConnection(Boolean shouldMonitorTransactions)
at System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction[T](Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess)
at System.Data.Entity.Core.Objects.ObjectContext.SaveChangesToStore(SaveOptions options, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction)
at System.Data.Entity.Core.Objects.ObjectContext.SaveChangesInternal(SaveOptions options, Boolean executeInExistingTransaction)
at System.Data.Entity.Internal.InternalContext.SaveChanges()
at dggyapi.LogRequestAndResponseHandler.Logrequestnresponse(String uuid, String requestbody, String responsebody, String requestmethod),",method:querymember
Overall Exception:System.Data.Entity.Core.EntityException: The underlying provider failed on Open---> MySql.Data.MySqlClient.MySqlException: Unable to connect to any of the specified MySQL hosts. ---> System.Net.Sockets.SocketException: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full.
at System.Net.Sockets.Socket.DoBind(EndPoint endPointSnapshot, SocketAddress socketAddress)
at System.Net.Sockets.Socket.InternalBind(EndPoint localEP)
at System.Net.Sockets.Socket.BeginConnectEx(EndPoint remoteEP, Boolean flowContext, AsyncCallback callback, Object state)
at System.Net.Sockets.Socket.BeginConnect(EndPoint remoteEP, AsyncCallback callback, Object state)
at MySql.Data.Common.MyNetworkStream.CreateSocketStream(MySqlConnectionStringBuilder settings, IPAddress ip, Boolean unix)
at MySql.Data.Common.MyNetworkStream.CreateStream(MySqlConnectionStringBuilder settings, Boolean unix)
at MySql.Data.Common.StreamCreator.GetStream(MySqlConnectionStringBuilder settings)
at MySql.Data.MySqlClient.NativeDriver.Open()
--- End of inner exception stack trace ---
at MySql.Data.MySqlClient.NativeDriver.Open()
at MySql.Data.MySqlClient.Driver.Open()
at MySql.Data.MySqlClient.Driver.Create(MySqlConnectionStringBuilder settings)
at MySql.Data.MySqlClient.MySqlPool.GetPooledConnection()
at MySql.Data.MySqlClient.MySqlPool.TryToGetDriver()
at MySql.Data.MySqlClient.MySqlPool.GetConnection()
at MySql.Data.MySqlClient.MySqlConnection.Open()
at System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch[TTarget,TInterceptionContext](TTarget target, Action`2 operation, TInterceptionContext interceptionContext, Action`3 executing, Action`3 executed)
at System.Data.Entity.Infrastructure.Interception.DbConnectionDispatcher.Open(DbConnection connection, DbInterceptionContext interceptionContext)
at System.Data.Entity.Core.EntityClient.EntityConnection.Open()
--- End of inner exception stack trace ---
at System.Data.Entity.Core.EntityClient.EntityConnection.Open()
at System.Data.Entity.Core.Objects.ObjectContext.EnsureConnection(Boolean shouldMonitorTransactions)
at System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction[T](Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess)
at System.Data.Entity.Core.Objects.ObjectContext.SaveChangesToStore(SaveOptions options, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction)
at System.Data.Entity.Core.Objects.ObjectContext.SaveChangesInternal(SaveOptions options, Boolean executeInExistingTransaction)
at System.Data.Entity.Internal.InternalContext.SaveChanges()
at dggyapi.LogRequestAndResponseHandler.Logrequestnresponse(String uuid, String requestbody, String responsebody, String requestmethod)
Innerexception:System.Net.Sockets.SocketException (0x80004005): An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full.
at System.Net.Sockets.Socket.DoBind(EndPoint endPointSnapshot, SocketAddress socketAddress)
at System.Net.Sockets.Socket.InternalBind(EndPoint localEP)
at System.Net.Sockets.Socket.BeginConnectEx(EndPoint remoteEP, Boolean flowContext, AsyncCallback callback, Object state)
at System.Net.Sockets.Socket.BeginConnect(EndPoint remoteEP, AsyncCallback callback, Object state)
at MySql.Data.Common.MyNetworkStream.CreateSocketStream(MySqlConnectionStringBuilder settings, IPAddress ip, Boolean unix)
at MySql.Data.Common.MyNetworkStream.CreateStream(MySqlConnectionStringBuilder settings, Boolean unix)
at MySql.Data.Common.StreamCreator.GetStream(MySqlConnectionStringBuilder settings)
at MySql.Data.MySqlClient.NativeDriver.Open()
我刚刚重新启动了我的网络服务器，并尝试跟踪持久性并找到了
mysql> show status where variable_name like 'thread%';
+-------------------+-------+
| Variable_name | Value |
+-------------------+-------+
| Threads_cached | 4 |
| Threads_connected | 41 |
| Threads_created | 53302 |
| Threads_running | 2 |
+-------------------+-------+
4 rows in set
mysql> show processlist;
+----------+---------+--------------------+--------+---------+------+-------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+----------+---------+--------------------+--------+---------+------+-------+------------------+
| 3540670 | myuser | localhost:56924 | NULL | Sleep | 111 | | NULL |
| 3540671 | myuser | localhost:56925 | NULL | Sleep | 111 | | NULL |
| 3540692 | myuser | localhost:56928 | NULL | Sleep | 2 | | NULL |
| 11278418 | myuser | 192.168.0.200:1038 | mydb | Sleep | 44 | | NULL |
| 11278428 | myuser | 192.168.0.200:1043 | mydb | Sleep | 38 | | NULL |
| 11278439 | myuser | 192.168.0.200:1044 | mydb | Sleep | 33 | | NULL |
| 11278441 | myuser | 192.168.0.200:1045 | mydb | Sleep | 15 | | NULL |
| 11278597 | myuser | 192.168.0.200:1077 | mydb | Sleep | 18 | | NULL |
| 11278602 | myuser | 192.168.0.200:1078 | mydb | Sleep | 6 | | NULL |
| 11278627 | myuser | 192.168.0.200:1080 | mydb | Sleep | 102 | | NULL |
| 11278654 | myuser | 192.168.0.200:1082 | mydb | Sleep | 102 | | NULL |
| 11278668 | myuser | 192.168.0.200:1087 | mydb | Sleep | 97 | | NULL |
| 11278710 | myuser | 192.168.0.200:1088 | mydb | Sleep | 89 | | NULL |
| 11278768 | myuser | 192.168.0.200:1089 | mydb | Sleep | 89 | | NULL |
| 11278780 | myuser | 192.168.0.200:1090 | mydb | Sleep | 88 | | NULL |
| 11278781 | myuser | 192.168.0.200:1091 | mydb | Sleep | 85 | | NULL |
| 11278805 | myuser | 192.168.0.200:1092 | mydb | Sleep | 76 | | NULL |
| 11278860 | myuser | 192.168.0.200:1093 | mydb | Sleep | 73 | | NULL |
| 11278877 | myuser | 192.168.0.200:1094 | mydb | Sleep | 66 | | NULL |
| 11278898 | myuser | 192.168.0.200:1099 | mydb | Sleep | 54 | | NULL |
| 11278913 | myuser | 192.168.0.200:1100 | mydb | Sleep | 46 | | NULL |
| 11278935 | myuser | 192.168.0.200:1101 | mydb | Sleep | 42 | | NULL |
| 11303229 | myuser | 192.168.0.200:1833 | mydb | Sleep | 3 | | NULL |
| 11307621 | myuser | 192.168.0.200:2006 | mydb | Sleep | 161 | | NULL |
| 11307953 | myuser | 192.168.0.200:2028 | mydb | Sleep | 93 | | NULL |
| 11307998 | myuser | 192.168.0.200:2029 | mydb | Sleep | 76 | | NULL |
| 11308004 | myuser | 192.168.0.200:2030 | mydb | Sleep | 74 | | NULL |
| 11308244 | myuser | 192.168.0.200:2038 | mydb | Sleep | 147 | | NULL |
| 11308349 | myuser | 192.168.0.200:2044 | mydb | Sleep | 132 | | NULL |
| 11308350 | myuser | 192.168.0.200:2045 | mydb | Sleep | 127 | | NULL |
| 11308387 | myuser | 192.168.0.200:2051 | mydb | Sleep | 126 | | NULL |
| 11308416 | myuser | 192.168.0.200:2052 | mydb | Sleep | 119 | | NULL |
| 11308454 | myuser | 192.168.0.200:2053 | mydb | Sleep | 71 | | NULL |
| 11308460 | myuser | 192.168.0.200:2054 | mydb | Sleep | 98 | | NULL |
| 11308487 | myuser | 192.168.0.200:2055 | mydb | Sleep | 44 | | NULL |
| 11308498 | myuser | 192.168.0.200:2056 | mydb | Sleep | 23 | | NULL |
| 11308542 | myuser | 192.168.0.200:2057 | mydb | Sleep | 13 | | NULL |
| 11308560 | myuser | 192.168.0.200:2058 | mydb | Sleep | 10 | | NULL |
| 11308682 | myuser | server5:5190 | NULL | Sleep | 117 | | NULL |
| 11308722 | myuser | server5:51903 | mydb | Query | 0 | NULL | show processlist |
+----------+---------+--------------------+--------+---------+------+-------+------------------+
40 rows in set
这正常吗？
【问题讨论】：
抱歉回复晚了，非常感谢@LeandroBardelli先生，真的很感谢它 【参考方案1】：问题似乎很清楚，错误说：
System.Net.Sockets.SocketException: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full.
造成这种情况的原因可能是多方面的（您可以 google 一下），但通常是因为缺少硬件、缺少服务器更新、过时的更新，或者您没有在连接上处理对象，或者没有关闭连接，内存不足，资源不足，但在定义上：你使用了很多端口。
你可以试试这个：
在 Windows Server 2008 R2 上 打开命令提示符
键入以下内容 netsh int ipv4 设置动态端口 tcp start=10000 num=50000 按回车
键入以下内容 netsh int ipv4 set dynamicport udp start=10000 num=50000 按回车
键入以下内容 netsh int ipv6 set dynamicport tcp start=10000 num=50000 按回车
键入以下内容 netsh int ipv6 set dynamicport udp start=10000 num=50000 按回车
更多信息请访问： http://web.archive.org/web/20160118151510/http://blogs.technet.com/b/askds/archive/2008/10/29/port-exhaustion-and-you-or-why-the-netstat-tool-is-your-friend.aspx
https://blog.whitesites.com/blog.aspx?key=635140180116307813
【讨论】：
老实说，我没有尝试执行这些命令，因为这是一个紧急场景，我不得不重新启动服务器，即使问题暂时消失了，问题还没有真正解决，但我会尝试减少我代码中的端口，我真的很感谢你的帮助，希望它能解决我的问题以上是关于Web API 在使用几天后总是无法连接到 MYSQL 数据库的主要内容，如果未能解决你的问题，请参考以下文章
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