Skip to main content

Better data type handling mechanism landed on cvs

Hi all!

Yesterday, 2009-12-12, Josh Cooley committed a better datatype handling mechanism to Npgsql. This will allow Npgsql to be more consistent when handling types because it is now much better defined when to return specific (or provider specific) datatypes and when to return CLR datatypes.

What does all this mean?

Well, Npgsql now implements the methods DbDataReader.GetProviderSpecificValue(), DbDataReader.GetproviderSpecificValues() and GetProviderSpecificDataType().

With those methods implemented, users will have a defined way of getting the specific types provided by Npgsql. The other methods will now always return the CLR types.

This modification will also enable Npgsql to work better with the ado.net library. For example, we have reports that NpgsqlInet data wasn't being rendered in a DataGrid.
By inspecting the test case, the dataset was correctly filled, but Datagrid seemed to not like NpgsqlInet and didn't render its value. With this type handling modification, the data would be returned as an CLR type, maybe an IPAddress or a String which, according to my tests, showed up correctly.

Another solution this modification enable is about support for "interval" npgsql datatype. We have a bug report about that and this modification will fix it too.

This is a big change in the way Npgsql handles data types. We would like you to test it and send us feedback about problems and solutions this change brought. Thanks in advance.

Comments

Anonymous said…
This is great news, thanks Josh and Francisco!
Unknown said…
Today I tried to run edmgen, at no luck. When I tried to post a detailed comment to http://npgsql.com/wp-comments-post.php
I received a Service Unavaiiable error.
I would like to know if the postgresql and npgsql.dll are willing to give support for free or are they expecting an income from.
Hi, Pedro.

Did you try our user forums?

forums.npgsql.org

What error are you getting?

I hope it helps.

btw, service unavailable errors can appear on any site. Be it npgsql.com or google.com.

And answering your question, Npgsql and Postgresql already give support for free since the beginning.
rr8004 said…
I really liked your blog! Please come visit my site City Guide Louisville when you got time.

Popular posts from this blog

UUID datatype and COPY IN/OUT support added to cvs

Hi all! It was just added support to uuid datatype in cvs head. This type will be available in next Postgresql release 8.3. Thanks to David Bachmann for his patch! You can get more info about this patch in this mailing list post . Also was added support for copy in and copy out operations. Now, users can provide streams which can be copied directly to and from Postgresql tables! Thanks to Kalle Hallivuori for providing a patch! Thanks to Truviso for giving support to Kalle. More info about that including a demo and ready to use compiled Npgsql.dll versions can be found here . That's it! As soon as we get more features added, I will post info about them here. Stay tuned! :)

Npgsql Tips: Using " in (...)" queries with parameters list and "any" operator

Hi, all! We have received some users questions about how to send a list of values to be used in queries using the "in" operator. Something like: select foo, bar from table where foo in (blah1, blah2, blah3); Npgsql supports array-like parameter values and the first idea to have this working would try to use it directly: NpgsqlCommand command = new NpgsqlCommand("select * from tablee where field_serial in (:parameterlist)", conn); ArrayList l = new ArrayList(); l.Add(5); l.Add(6); command.Parameters.Add(new NpgsqlParameter("parameterlist", NpgsqlDbType.Array | NpgsqlDbType.Integer)); command.Parameters[0].Value = l.ToArray(); NpgsqlDataReader dr = command.ExecuteReader(); but unfortunately this won't work as expected. Npgsql will send a query like this: select * from tablee where field_serial in ((array[5,6])::int4[]) And Postgresql will complain with the followin...

Using Entity Framework 6 with Npgsql 2.1.0

UPDATE (2014-05-19): Marek Beneš noticed a problem in the default connection factory config. It is fixed now. Thanks, Marek! UPDATE (2014-02-20): I created a new post explaining how to get Npgsql 2.1.0. Although this post is about EF 6, I'd like to talk about our current situation to support both EF 6 and EF4.x which explain why there are some subtle changes between EF 4.x and EF 6.x App.config settings.  Support for EF versions 4.x and 6.x Sometime after we started to work on Npgsql 2.1.0, we started to add code to support EF6 and decided to reorganize our Entity Framework support code. Shay created a pull request to organize this change and isolate the EF code out of core Npgsql code. The result was the creation of two separated assemblies: Npgsql.EntityFramework.dll for EF6 and above; Npgsql.EntityFrameworkLegacy.dll for EF4.x. Only when using Npgsql with EF6 you will need to reference Npgsql.EntityFramework.dll assembly. This is needed because the EF ...