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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for September 17th, 2020

Delphi: TInvokableClassRegistryHelper.GetInterfaceNamespace as the opposite of TInvokableClassRegistry.RegisterInterface

Posted by jpluimers on 2020/09/17

A while ago, I needed the opposite of InvRegistry.RegisterInterface(TypeInfo(MySoapInterfacePortType, 'urn:myURN', 'utf-8');, so instead of registering an interface with a namespace URN, obtain the URN by passing the interface inverting [WayBack] TInvokableClassRegistry.RegisterInterface.

This is the class helper I wrote:

type
  TInvokableClassRegistryHelper = class helper for TInvokableClassRegistry
  public
    function GetInterfaceNamespace(Info: PTypeInfo): string;
  end;

function TInvokableClassRegistryHelper.GetInterfaceNamespace(Info: PTypeInfo): string;
var
  InfoGuid: TGUID;
begin
  // call like `Result := InvRegistry.GetInterfaceNamespace(TypeInfo(MySoapInterfaceType));`
  InfoGuid := GetTypeData(Info)^.Guid; // uses TypInfo; see https://stackoverflow.com/questions/8439246/is-it-possible-to-get-the-value-of-a-guid-on-an-interface-using-rtti
  Result := GetNamespaceByGUID(InfoGuid);
end;

It would have been a lot easier if TInvokableClassRegistry.GetIntfIndex has been public, because then [WayBack]TInvokableClassRegistry.GetRegInterfaceEntry could have been used.

–jeroen

Posted in Conference Topics, Conferences, Delphi, Development, Event, SOAP/WebServices, Software Development | Leave a Comment »

FireDAC can do DBMS back-end conditional SQL via Conditional Substitution

Posted by jpluimers on 2020/09/17

Though the field-types mentioned in the problem and solution are equal (so either is wrong), the solution in [WayBack] I have a little problem with FireDAC and the TStringField and TWideStringField design time generation… – Juan C. Cilleruelo – Google+ pointed out by Jeff Weir is interesting: FireDAC supports conditionals that depend on the DBMS back-end, so you can differentiate between them.

The feature is called Conditional Substitution and has been present ever since AnyDAC (which got bought by Embarcadero, transformed into FireDAC, then after Idera bought Embarcadero, the main developer got pink-slipped).

The AnyDAC documentation is in the wayback machine, though you have to disable the onload event in order to read it.

The [Archive.is] XE5: Preprocessing Command Text (FireDAC) – RAD Studio documentation is not much different from the current state [Archive.is].

More background reading is at [WayBack] www.freepascal.org/~michael/articles/anydac2/anydac2.pdf and Cary Jensen covered it in his 2017 course on FireDAC of which you can see the free ToC.

Example from that thread:

SELECT ART.CD_ITEM                ,
       ART.CD_FAMILY              ,
       ART.CD_CATALOGUE           ,
       CAT.DS_CATALOGUE           ,
       FAM.DS_FAMILY              ,
{IF MSSQL}
       CASE WHEN EXISTS(SELECT 1 FROM CONFIGURATIONS COM WHERE COM.CD_PARENT = ART.CD_ITEM)
          THEN CAST('Y' AS NVARCHAR) 
          ELSE CAST('N' AS NVARCHAR) 
       END HAS_CONFIGURATION      ,
{fi}
{IF FIREBIRD}
       CASE WHEN EXISTS(SELECT 1 FROM CONFIGURATIONS COM WHERE COM.CD_PARENT = ART.CD_ITEM)
          THEN 'Y'  
          ELSE 'N'  
       END HAS_CONFIGURATION      ,
{fi}
       ART.DS_ITEM                ,
       ART.CD_TAX                 ,
       TAX.DS_TAX                 ,
       TAX.PRC_TAX               ,
...

Given the problem statement, the casts likely should have been VARCHAR instead of NVARCHAR, but the construct can be very powerful.

–jeroen

Posted in Database Development, Delphi, Development, Firebird, InterBase, Software Development, SQL, SQL Server | Leave a Comment »

GitHub – gabr42/MultiBuilder: Runs multiple programs in parallel, shows results

Posted by jpluimers on 2020/09/17

Given a Delphi build-VM with enough CPU cores to run many builds in parallel: [WayBack] GitHub – gabr42/MultiBuilder: Runs multiple programs in parallel, shows results.

Much more on this at [WayBack] The Delphi Geek: Introducing MultiBuilder.

Via: [WayBack] Parallel build/test systems made easy(er) – Primož Gabrijelčič – Google+

–jeroen

Posted in Delphi, Development, Software Development | Leave a Comment »