Question

get output value

Asked by: firekiller15

delphi

below is my code
how can i print the latest studentid on the editbox ?

 

Clear;
 Add('DECLARE');
 Add('varStudentID NUMBER;');
 Add('BEGIN');
 Add('SELECT NVL(MAX(STUDENTID),0) + 1 INTO varStudentID FROM ');
 Add(' STUDENT.STUDENTABLE');
 Add('INSERT INTO');
 Add('STUDENT.STUDENTTABLE');
 Add('VALUES');
 Add('(varStudentID,:studentNAme);');
 Add('END;');
 ParamByName('studentNAme').AsString := studentNAme;
 Execute;

                                  
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Asked On
2008-09-11 at 20:40:43ID23725295
Tags

delphi

Topic

Delphi Programming

Participating Experts
2
Points
250
Comments
8

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Answers

 

by: Geert_GruwezPosted on 2008-09-11 at 23:35:58ID: 22457545

Clear;
 Add('DECLARE');
 Add('varStudentID NUMBER;');
 Add('BEGIN');
 Add('SELECT NVL(MAX(STUDENTID),0) + 1 INTO varStudentID FROM ');
 Add(' STUDENT.STUDENTABLE');
 Add('INSERT INTO');
 Add('STUDENT.STUDENTTABLE');
 Add('VALUES');
 Add('(varStudentID,:studentNAme);');
 Add('END;');
 ParamByName('studentNAme').AsString := studentNAme;
 Execute;
 Clear;
 Add('SELECT STUDENTID FROM STUDENT.STUDENTABLE WHERE studentName = :studentName');
 ParamByName('studentNAme').AsString := studentNAme;
 Open;
 Editbox.Text := FieldByName('STUDENTID').AsString;
 Close

                                              
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by: kretzschmarPosted on 2008-09-11 at 23:38:03ID: 22457556

well, seems to be oracle, or?

i would advice you to create a sequence for your StundentID and a before-insert-trigeger on the table for supplying this field with the sequence-value

but anyway try this

Clear;
 Add('DECLARE');
 Add('varStudentID NUMBER;');
 Add('BEGIN');
 Add('SELECT NVL(MAX(STUDENTID),0) + 1 INTO varStudentID FROM ');
 Add(' STUDENT.STUDENTABLE');
 Add('INSERT INTO');
 Add('STUDENT.STUDENTTABLE');
 Add('VALUES');
 Add('(varStudentID,:studentNAme) returning StudentID into :outParam;');
 Add('END;');
 ParamByName('studentNAme').AsString := studentNAme;
 Execute;
 ID := ParamByName('outParam').AsInteger;

guess the real-field is StudentID
using a sequence/trigger pair only the insert statement is needed

not tested

meikl ;-)

 

by: firekiller15Posted on 2008-09-12 at 00:14:22ID: 22457692

i try to display ID but it is empty
showmessage(IntToStr(ID));

 

by: kretzschmarPosted on 2008-09-12 at 01:12:25ID: 22457885

well, got it also not work, so i would advice to do it in two steps

step 1: get the maxvalue
step 2: do the insert

(its really hard to get an output from an anonymous pl/sql-block)

meikl ;-)

 

by: Geert_GruwezPosted on 2008-09-12 at 01:19:17ID: 22457912

Clear;
 Add('DECLARE');
 Add('varStudentID NUMBER;');
 Add('BEGIN');
 Add('SELECT NVL(MAX(STUDENTID),0) + 1 INTO varStudentID FROM ');
 Add(' STUDENT.STUDENTABLE');
 Add('INSERT INTO');
 Add('STUDENT.STUDENTTABLE');
 Add('VALUES');
 Add('(varStudentID,:studentNAme);');
 Add('Commit;');
 Add('RAISE_APPLICATION_ERROR(-20001,''StudentId: '' || varStudentId);');
 Add('END;');
 ParamByName('studentNAme').AsString := studentNAme;
 try
   Execute;
 on E: Exception do 
    if SameText(Copy(E.Message, 1, 11), 'StudentId: ') then 
      ID := Copy(E.Message, 12, 200) 
    else 
      Raise;
  end;
                                              
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by: Geert_GruwezPosted on 2008-09-12 at 01:20:10ID: 22457917

the text gets thrown away with firefox 3 ...

                                              
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by: firekiller15Posted on 2008-09-12 at 01:32:07ID: 22457966

if there any function i can use  like NVL
where i can set default = 0 +1??

 

by: Geert_GruwezPosted on 2008-09-12 at 01:35:10ID: 22457978

you can not set an autoincrement function (or any function) as a default for a column.
or is it not that what you are looking for ?

please describe in more detail ...

20120131-EE-VQP-002

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