[Mono-dev] Mono, TDS and SQL Server 2012

Chris Tacke ctacke at opennetcf.com
Fri Aug 1 17:15:22 UTC 2014

I'm trying to add SQL Server support to the Mono (on Linux, not Android if it matters) version of one of our products.

I have a codebase that works fine on Windows, but under Mono, it's not behaving.  We're using SQL Authentication, not NT.

I am able to get back a list of table names, so I know it's "talking" to the database, but when I attempt to query rows from a table I get this:

[ERROR] FATAL UNHANDLED EXCEPTION: System.Exception: Unknown packet type 129
  at Mono.Data.Tds.Protocol.TdsComm.GetPhysicalPacketHeader () [0x00000] in <filename unknown>:0
  at Mono.Data.Tds.Protocol.TdsComm.GetPhysicalPacket () [0x00000] in <filename unknown>:0
  at Mono.Data.Tds.Protocol.TdsComm.Peek () [0x00000] in <filename unknown>:0
  at Mono.Data.Tds.Protocol.Tds.NextResult () [0x00000] in <filename unknown>:0
  at System.Data.SqlClient.SqlCommand.ExecuteScalar () [0x00000] in <filename unknown>:0
  at OpenNETCF.ORM.SQLStoreBase`1[OpenNETCF.ORM.SqlEntityInfo].ExecuteScalar (System.String sql) [0x00000] in <filename unknown>:0
  at OpenNETCF.ORM.SqlServerDataStore.get_ServerVersion () [0x00000] in <filename unknown>:0
  at OpenNETCF.ORM.SqlServerDataStore.Fetch (System.String entityName, Int32 fetchCount, Int32 firstRowOffset, System.String sortField, FieldSearchOrder sortOrder, OpenNETCF.ORM.FilterCondition filter, Boolean fillReferences) [0x00000] in <filename unknown>:0
  at SolutionFamily.Storage.DataEntityProvider.GetEntityInstances (System.String entityName, Int32 skipNumber, Int32 retrieveNumber) [0x00000] in <filename unknown>:0
{more call stack omitted}

So it looks like the TDS version in Mono is old, maybe?  Packet type 129 looks like it's a "result" packet:


And it's been in use since SQL Server 7, which itself is pretty far from "recent".

So my questions, I guess, Are:

-          Is connecting to a SQL Server 2012 database from a Mono app a supported scenario?

-          Is there a newer version of TDS on the System.Data.* stuff available that adds support?

-          Has anyone had any luck connecting to a "modern" version of SQL Server?

-          Any thoughts on how to proceed (other than debugging and attempting to implement this stuff myself)?

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