Runtime error when using DateOnly

[musictopia2]

I have a database that has a date property. However, the C# class is DateOnly since I only need the date, not the time. However, when I try to use a sql command and the c# class is DateOnly, the error is something like this
The member WhatDate1 of type System.DateOnly cannot be used as a parameter value
at Dapper.SqlMapper.LookupDbType(Type type, String name, Boolean demand, ITypeHandler& handler) in /_/Dapper/SqlMapper.cs:line 426

WhatDate1 is the field name

[musictopia2]

Here is what I think can fix the problem. Under static SqlMapper() in SQLMapper.cs file, if you add DateOnly and DateOnly?, that will fix the problem.
I would also need TimeOnly and TimeOnly? to be added for cases where only time is needed.

[mgravell]

There's also a branch (and possibly PR) that does this, but I was waiting on .NET 6 GA (which has now passed, so: yay).

So: what RDBMS/provider are you seeing this with, so I can validate?

[musictopia2]

I am using the sql server one.

[mgravell]

There are 2 official SQL Server drivers - System.Data.SqlClient, and Microsoft.Data.SqlClient; which are you using, and exactly what version?

[mgravell]

Sorry, I should have added: I don't mean to sound picky - my aim is to add the relevant tests and deploy this tomorrow, so anything I can discover to help shorten that: is good

…

On Sun, 21 Nov 2021, 19:15 musictopia2, ***@***.***> wrote: I am using the sql server one. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#1728 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAAEHMEANBB43LK6BFT3KB3UNFAMZANCNFSM5IPHCV7Q> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>.

[musictopia2]

The version I am using is this one.

[musictopia2]

Microsoft.Data.SqlClient
version 1.1.1
Tried to add the xml but that was deleted.

[musictopia2]

looks like they have that one up to 4.0.0.
I can use that one though if that would help as well.

[mgravell]

So: I updated my test harness, and: it simply doesn't work for either SqlClient; both give an exception like:

 Message: 
System.ArgumentException : No mapping exists from object type System.DateOnly to a known managed provider native type.

 Stack Trace: 
MetaType.GetMetaTypeFromValue(Type dataType, Object value, Boolean inferLen, Boolean streamAllowed)
MetaType.GetMetaTypeFromType(Type dataType)
SqlParameter.GetMetaTypeOnly()
SqlParameter.Validate(Int32 index, Boolean isCommandProc)
SqlCommand.BuildParamList(TdsParser parser, SqlParameterCollection parameters, Boolean includeReturnValue)
SqlCommand.BuildExecuteSql(CommandBehavior behavior, String commandText, SqlParameterCollection parameters, _SqlRPC& rpc)
SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean isAsync, Int32 timeout, Task& task, Boolean asyncWrite, Boolean inRetry, SqlDataReader ds, Boolean describeParameterEncryptionRequest)
SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry, String method)
SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
SqlCommand.ExecuteReader(CommandBehavior behavior)
SqlCommand.ExecuteDbDataReader(CommandBehavior behavior)

Do you have an example of it actually working with raw ADO.NET?

[mgravell]

(to be clear: I mean "the underlying ADO.NET provider doesn't work with DateOnly/TimeOnly", not "Dapper doesn't ...")

[mgravell]

Cross-referencing: dotnet/SqlClient#1009

[musictopia2]

Do you think there is a way for dapper to do some type of version so if dateonly was used, then it can somehow go to the external as datetime behind the scenes. Because not only its possible they may not ever fix it, but i found the newest version of microsofts version of the sql provider only works if a person uses ssl on a webpage which would not work if somebody had an intranet that is only for people on the local network with no connection to the internet.

[musictopia2]

I see an issue that was posted here dotnet/efcore#24507 where they showed a converter a person can use as a temporary workaround in entity framework core. Can something like this be done to dapper? Would be disappointing if a person is forced to use entity framework core. If that is the case, then dapper would not work so well since without the dateonly support, businesses are blocked from even moving forward.