[Firebird-net-provider] [FB-Tracker] Created: (DNET-945) Inserting data after update results in "Column unknown" or "Must declare the variable '@px' errors

[Jan P. (JIRA) <tr...@fi...>]

Inserting data after update results in "Column unknown" or "Must declare the variable '@px' errors
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                 Key: DNET-945
                 URL: http://tracker.firebirdsql.org/browse/DNET-945
             Project: .NET Data provider
          Issue Type: Bug
          Components: Entity Framework Core
    Affects Versions: 7.1.1.0
         Environment: Windows 10, 16 GB RAM, i7-8850H CPU, Entity Framework Core 2.2.4, Firebird driver 7.1.1, Asp.Net Web Application with target framework 4.7.2, .Net Standard library 2.0
            Reporter: Jan Pross
            Assignee: Jiri Cincura
            Priority: Blocker


Error is basically the same as in issue described here https://stackoverflow.com/questions/56357771/how-to-fix-must-declare-the-variable-with-firebirdsql-entityframeworkcore-fire

I've created simple web application where you can reproduce the issue https://filebin.net/cpfsuoh16xdl28xi
Steps to reproduce:
1. Build and run the web app
2. Repeat the same request e.g. 50 times by using some tool (if the requests are generated by refreshing the browser, the issue will not occur)
2. a. Capture the request e.g. with fiddler 
2. b. Repeat the request from fiddler 50 times
3. An error occurs:
3. a. 

Dynamic SQL Error
SQL error code = -206
Column unknown
P0
At line 2, column 9

at FirebirdSql.Data.FirebirdClient.FbCommand.ExecuteReader(CommandBehavior behavior)
   at System.Data.Common.DbCommand.ExecuteDbDataReaderAsync(CommandBehavior behavior, CancellationToken cancellationToken)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.<ExecuteAsync>d__17.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.<ExecuteAsync>d__32.MoveNext()

OR

3. b.

Must declare the variable '@p1'

at FirebirdSql.Data.FirebirdClient.FbCommand.UpdateParameterValues()
   at FirebirdSql.Data.FirebirdClient.FbCommand.ExecuteCommand(CommandBehavior behavior, Boolean returnsSet)
   at FirebirdSql.Data.FirebirdClient.FbCommand.ExecuteReader(CommandBehavior behavior)
   at System.Data.Common.DbCommand.ExecuteDbDataReaderAsync(CommandBehavior behavior, CancellationToken cancellationToken)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.<ExecuteAsync>d__17.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.<ExecuteAsync>d__32.MoveNext()


Names of the columns and parameters can be different each time. Some requests will pass successfully some will result in beforehand mentioned errors. When an error occurs any other following request will result in an error unless the whole server is restarted.

We encountered this issue after switching some other parts of our solution to firebird. We are using 7.1.1 driver and we can not update to 7.5.0 for now (as it depends on EF core >= 3.0).


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