从 npgsql 中的流读取时出现异常

Question

我们有一个表，其中一列为 text 数据类型，并且只有 3 条记录。我们使用 ExecuteNonQuery() 在文本列上执行更新查询，它抛出错误“从流中读取时异常”。错误随机发生，这意味着有时会执行查询，有时会抛出错误，但最大比率是错误，就像它在 10 次中抛出 9 次错误。我们正在使用

Npgsql -Version 4.0.4

和

PostgreSQL version 11.1

在

windows 2012 R2

上运行。此外，我们尝试将超时设置为 0，但会立即抛出错误，因此它也与超时错误无关。 以下是我们的例外情况。

   at Npgsql.NpgsqlReadBuffer.<>c__DisplayClass31_0.<g__EnsureLong|0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Npgsql.NpgsqlConnector.<>c__DisplayClass161_0.<g__ReadMessageLong|0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Npgsql.NpgsqlDataReader.d__46.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Npgsql.NpgsqlDataReader.NextResult()
   at Npgsql.NpgsqlCommand.d__100.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Npgsql.NpgsqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
   at Npgsql.NpgsqlCommand.ExecuteReader()
   at Npgsql.PostgresDatabaseInfo.d__13.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Npgsql.PostgresDatabaseInfo.d__11.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Npgsql.PostgresDatabaseInfoFactory.d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Npgsql.NpgsqlDatabaseInfo.d__79.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Npgsql.NpgsqlConnector.d__150.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Npgsql.NpgsqlConnector.d__149.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Npgsql.ConnectorPool.d__19.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Npgsql.NpgsqlConnection.<>c__DisplayClass32_0.<g__OpenLong|0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Npgsql.NpgsqlConnection.Open()
   at DataAccessLayer.Providers.Executors.PostgreSQL.ExecuteQuery(PreparedStatement`1 preparedStatement, Int32 timeout) in C:\code\Framework\DataAccessLayer\Providers\Executors\PostgreSQL.cs:line 64
   at DataAccessLayer.Providers.PostgreSQL.ExecuteQuery(IExecuteQuerySupport command, Int32 timeout) in C:\main\code\Framework\DataAccessLayer\Providers\Modules\PostgreSQLServer.cs:line 26
   at BAL.Base.RolesManagement.Roles.GetDatabaseRole(Int64 userID) in C:\main\code\BusinessAccessLayer\BAL\Base\RolesManagement\Roles.cs:line 398
   at API.Controllers.MyWorkspacesController.ConnectGroup(Int64 groupID) in C:\main\code\Web\API\Controllers\MyWorkspacesController.cs:line 390
   --- End of exception stack trace ---
    Message : Unable to read data from the transport connection: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
StackTrace :    at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   at Npgsql.NpgsqlReadBuffer.<>c__DisplayClass31_0.<g__EnsureLong|0>d.MoveNext()
    --- End of inner exception stack trace --- 
    Message : A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond
StackTrace :    at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   --- End of inner exception stack trace ---

Answer 1

我们在版本

4.0.4

上遇到了类似的问题（好吧，任何

4.x

真的）。

事实证明，已经存储在数据库中的列之一包含无效字符或以某种方式损坏。

Simple

update <tab> set <col> = '' where id = <id>

对于那一列修复了

Exception while reading from the stream

错误消息。

附言。在没有可疑 UTF-8 字符的情况下恢复日期不会导致问题再次出现。