[Firebird-net-provider] Expanding mapping abilities for EF
Hi *,
I was thinking about supporting broader variety of datatypes (from
.NET) in EF for mapping. We already had a request for direct guid
support and since beginning we have (manual) support for bools.
Unfortunately neither of these is available directly in FB, hence
there's set of standard workarounds like char(16) octets for guid.
And as we started supporting features not available in FB directly
through autoincrement field via #PK_GEN# in comment, I would like to
propose similar way for bool and guid. I don't like the way of
guessing - char(16) octets = guid etc. It may work in 99 percent
cases but, sooner or later you hit the wall with bad guess. So my
propose is to override the datatype of column reported by provider
for EF by two new magic keywords. For guids it'll be #GUID# and for
bools #BOOL#.
What I'm not sure about is whether do check for the datatype as well.
Like smallint #BOOL# is bool, but timestamp #BOOL# is still
timestamp. I'm more for blindly using the comment and leave the
thinking to developer. Why? Because for i.e. bool you can have
smallint, int, bigint and maybe decimal if you're brave enough. For
guids with triggers and views maybe some crazy types. This shouldn't
create any hidden places with potential error. As if the thinking will
be wrong with first let's say insert you'll get an error. But that's
only my view.
Any comments, thoughts?
--
Jiri {x2} Cincura (CTO x2develop.com)
http://blog.cincura.net/ | http://www.ID3renamer.com
--
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Re: [Firebird-net-provider] Expanding mapping abilities for EF
Hi, At December-30-09, 2:40 PM, Jiri Cincura wrote: Hi *, I was thinking about supporting broader variety of datatypes (from .NET) in EF for mapping. We already had a request for direct guid support and since beginning we have (manual) support for bools. Unfortunately neither of these is available directly in FB, hence there's set of standard workarounds like char(16) octets for guid. And as we started supporting features not available in FB directly through autoincrement field via #PK_GEN# in comment, I would like to propose similar way for bool and guid. I don't like the way of guessing - char(16) octets = guid etc. It may work in 99 percent cases but, sooner or later you hit the wall with bad guess. So my propose is to override the datatype of column reported by provider for EF by two new magic keywords. For guids it'll be #GUID# and for bools #BOOL#. What I'm not sure about is whether do check for the datatype as well. Like smallint #BOOL# is bool, but timestamp #BOOL# is still timestamp. I'm more for blindly using the comment and leave the thinking to developer. Why? Because for i.e. bool you can have smallint, int, bigint and maybe decimal if you're brave enough. For guids with triggers and views maybe some crazy types. This shouldn't create any hidden places with potential error. As if the thinking will be wrong with first let's say insert you'll get an error. But that's only my view. Any comments, thoughts? What happens if someone uses another type for bools? As an example, I usually use CHAR(1) with the values T and F. If it can be configurable, with a default of SMALLINT, it would be even better. And, I could almost say the same for GUIDs, as some might be storing them in a VARCHAR(32), in another charset than OCTET. I currently use ECO and the GUID field is stored in a VARCHAR(32) UTF-8 field. And, don't try to automatically map to those types, because it's possible that someone uses a SMALLINT field as an actual SMALLINT, not a boolean. I could probably say the same for CHAR(16) OCTET, as you might be suspecting for that other 1%, where the assumption might be wrong. I would suggest, if it's possible, to simply give a warning to the developer that #BOOL# and TIMESTAMP don't match, but still let the developer use that combination. And, if an error occurs in runtime, then the developer will realize that it wont work. -- Best regards, Daniel Rail Senior Software Developer ACCRA Solutions Inc. (www.accra.ca) ACCRA Med Software Inc. (www.filopto.com) -- This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev ___ Firebird-net-provider mailing list Firebird-net-provider@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/firebird-net-provider
[Firebird-net-provider] Problems with firebird .net provider on mono
Hi, I had problems in connection with Firebird 2.1 and the Provider on Mono. When the FbConnection.Open() method was called, one exception was raised: Unhandled Exception: System.TypeInitializationException: An exception was thrown by the type initializer for FirebirdSql.Data.Common.Charset --- System.ArgumentException: Encoding name 'shift_jis' not supported Parameter name: name at System.Text.Encoding.GetEncoding (System.String name) [0x0] at FirebirdSql.Data.Common.Charset.GetEncoding () [0x0] at FirebirdSql.Data.Common.Charset..ctor (Int32 id, System.String name, Int32 bytesPerCharacter, System.String systemName) [0x0] at FirebirdSql.Data.Common.Charset.InitializeSupportedCharsets () [0x0] at FirebirdSql.Data.Common.Charset..cctor () [0x0] --- End of inner exception stack trace --- at FirebirdSql.Data.FirebirdClient.FbConnectionInternal.Connect () [0x0] at (wrapper remoting-invoke-with-check) FirebirdSql.Data.FirebirdClient.FbConnectionInternal:Connect () at FirebirdSql.Data.FirebirdClient.FbConnectionPool.Create () [0x0] at FirebirdSql.Data.FirebirdClient.FbConnectionPool.CheckOut () [0x0] at (wrapper remoting-invoke-with-check) FirebirdSql.Data.FirebirdClient.FbConnectionPool:CheckOut () at FirebirdSql.Data.FirebirdClient.FbConnection.Open () [0x0] My connection string is: Database=/home/harpia/data/hapiadados.fdb;Server=127.0.0.1;Dialect=3;Password=masterkey;Port=3050;User=SYSDBA;Charset=Win1252; I had searching on web and I find something on this link http://www.mail-archive.com/firebird-net-provider@lists.sourceforge.net/msg06892.html Jiri answered on this link, that mono isn't supporting the referent charset (UNICODE_FSS), but I would like to use Win1252 It is possible using Mono? I try too: 1 To Donwload Mono's specific Firebird .Net Provider on this link http://sourceforge.net/projects/firebird/files/firebird-net-provider/2.5.1/FirebirdClient-2.5.1-MONO_LINUX.7z/download To install the assembly with gacutil command To reference the assembly on my project 2 To Donwload the Firebird .Net provider's source To Compile it with LINUX;MONO compiler directives on MonoDevelop (Like Jiri suggested previously) To reference the assembly on my project. all my tries are failed! :-( In the first try, the same exception persists. In the second try I could not compile the source, cause one Compiling Time Exception was raised that looks like a casting error [Task:File=/home/jdias/Área de Trabalho/NETProvider/source/FirebirdSql/Data/Client/Managed/Version10/GdsStatement.cs, Line=731, Column=95, Type=Error, Priority=Normal, Description=Can not compute type of conditional expression as `short' and `int' convert implicitly to each other(CS0172)] Please, someone can help me with this? Where I can donwload an functional assembly to work on mono using Charset Win1252? Thanks for any help and sorry the bad English -- João Dias de Carvalho Neto http://www.jdiasneto.blogspot.com jdias.bjsoftw...@gmail.com -- This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev ___ Firebird-net-provider mailing list Firebird-net-provider@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/firebird-net-provider
