Question

Oracle package function and procedure calls using ADO

Asked by: geobul

Hi,

Please, show me how to execute an Oracle package.function and procedure and read the result and OUT parameters using ADO components. No datasets are involved yet.

The following are test function and procedure prototypes in PL/SQL (hope they aren't wrong :-):

create or replace package GeoTest is

  -- Public function and procedure declarations
  function GeoConcatFunc(str1 in varchar2, str2 in varchar2) return varchar2;
  procedure GeoConcatProc(str1 in varchar2, str2 in varchar2, str3 out varchar2);

end GeoTest;

Environment: Delphi 7, Oracle 9i.

It doesn't matter which ADO component will be used as long as it does the job. I tried Command, DataSet and StoredProc (cmdStoredProc command type only) with no luck at all. Errors like 'the function is not a procedure' or 'parameter object is improperly defined' appeared most frequently.

Thank you

Regards, Geo

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Asked On
2005-11-26 at 04:25:08ID21643581
Tags

delphi

,

oracle

Topic

Delphi Programming

Participating Experts
1
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Comments
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Answers

 

by: mnasmanPosted on 2005-11-26 at 09:50:15ID: 15365319

Hello Geo,

  You can do that with AdoCommand, then define the parameters, and read the output parameter value

I tested this with Delphi 7, Oracle 10G R2

var
  P: TParameter;
begin
  AdoCommand1.CommandText := 'GEOTEST.GeoConcatProc';
  AdoCommand1.CommandType :=  cmdStoredProc;

  adocommand1.Parameters.CreateParameter('Str1',ftString,pdInput,100,'string1');
  adocommand1.Parameters.CreateParameter('Str2',ftString,pdInput,100,'string2');
  P := adocommand1.Parameters.CreateParameter('Str3',ftString,pdOutput,100,null);
  AdoCommand1.Execute();
  ShowMessage(P.Value);
end;

HTH

Regards,
Mohammed Nasman

 

by: geobulPosted on 2005-11-27 at 02:52:37ID: 15367820

Hi Mohammed,

Thank you very much. Procedure calls are working perfectly now. The error I was constantly making was using -1 as string parameter size. '-1' works for numbers but not for strings :-)

I need some more "little" help if you don't mind - I cannot get the result of a function call (called using ADODataSet or ADOStoredProc because ADOCommand doesn't recognise it as a SP). The call itself is successful. Is there any way (or workaround at least)? Additional 'hidden' parameter perhaps, or a returned dataset containing one value only? Alternatively I will ask PL/SQL developers to make procedures only, no problem at all.

I can also close this question at this point because you already helped me alot and open a new one later on about functions. Let me know what you think.

Thanks, Geo

 

by: mnasmanPosted on 2005-11-27 at 05:03:06ID: 15367996

Hello Geo,

  Function will work good with just AdoQuery, put them in select statement as following
 
  AdoQuery1.SQL.Text := 'select GEOTEST.GeoConcatFunc(''str1'',''str2'') from dual';
  AdoQuery1.Open;
  SHowMessage(AdoQuery1.Fields[0].Text);

Regards,
Mohammed

 

by: mnasmanPosted on 2005-11-27 at 05:26:56ID: 15368045

Geo, I recommand to use the parameters to provide the values, it's better way and quires works faster in oracle, so change the last example to :

  AdoQuery1.SQL.Text := 'select GEOTEST.GeoConcatFunc(:p1,:p2) from dual';
  AdoQuery1.Parameters.ParamByName('P1').Value := 'String1';
  AdoQuery1.Parameters.ParamByName('P2').Value := 'String2';
  AdoQuery1.Open;
  SHowMessage(AdoQuery1.Fields[0].Text);

HTH

Regards,
Mohammed

 

by: geobulPosted on 2005-11-28 at 06:13:26ID: 15372772

Many thanks, Mohammed. Simply perfect :-)

20120131-EE-VQP-002

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