[Delphi6] insert values on a database

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June 28th, 2012, 05:23 AM

Lucka

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Join Date: Jun 2012

Posts: 1

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[Delphi6] insert values on a database

hello,
i'm trying to insert some information about marck of a student in a school. But when I insert, using a DBGrid, the database create a new row!!! ok but i need to insert some information to create a relation with other table.
This is my code to create the relation...

Code:

procedure TForm1.Q1BeforePost(DataSet: TDataSet);
begin
  ADOCommand1.CommandText:=('INSERT INTO registro'+
                               '(IdStuFk, IdMatFk, IdDocFk) '+
                               'VALUES ('+NumIdAlunno+','+numId_Materie+','+numIdDoc+')');
  ADOCommand1.Execute;
end;

Ok,.... but when i insert this value into the database, the database create a new row!!!!!
It's not correct!!!! I need to insert my information in the same row where there is the mark!!! HELP ME!!!!
I tried to save the Mark but it is impossilbe, because there are a lot of information and are all the same(for example Rossi have six but Verdi can have the same mark)

June 28th, 2012, 02:53 PM

majlumbo

Contributing User

Join Date: Jun 2008

Posts: 251

Time spent in forums: 2 Days 22 h 50 m 14 sec
Reputation Power: 5

If a blank record is being inserted into your grid, then a new record is already entered into your database waiting for you to post it.

So in your BeforePost Method, you are again inserting a new record, which explains why you are getting a new row.

If you need to set some values of the record before it is posted, then simply assign the columns a value, i.e.

Code:

procedure TForm1.Q1BeforePost(DataSet: TDataSet);
begin
   ADOQuery1ColumnName.AsString := 'This is my new value';
end;

and let the post proceed. You do not want to issue yet another SQL Insert command.

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