Re: [SQL] Deadlock on transaction

Ezequias Rodrigues da Rocha wrote:
> This is delphi. I don't intent you understand but the sql actions are quite
> simple (I am reading a list of numbers).

Well, let's see - the last Pascal I did was in 1986 I think...

> If not dm.database1.InTransaction then
> dm.database1.StartTransaction;
>
> For i:= 0 to memo1.Lines.Count - 1 do

Loop through your import.

> Begin
> // Catching ID
> dm.qQ1.SQL.text:= Concat('select id from base.cartao where
> numero = ', memo1.lines[i]);
> dm.qQ1.open;
> cartaoID:= dm.qQ1.fieldByName('id').asString;
> // Cathing the ticket ID

OK, you're fetching ticket IDs one at a time.

> dm.qQ1.SQL.clear;
> dm.qQ1.SQL.text:= Concat('select nextval(',QuotedStr('
> base.ingresso_id') , ')');
> dm.qQ1.open;
> IngressoID:= dm.qQ1.fieldByName('nextval').asString;

And now you've generated a new ID from a sequence.

> // $$$$$$$$$$ Recording Tickets $$$$$$$$$$
> dm.Qq1.sql.text:= Concat('Insert into base.ingresso values ('
> , QuotedStr(IngressoID), ',' , EstadoID, ',' , 'now()', ',' , valor, ',' ,
> valor_promotor, ',' , AssentoID, ',', CaixaID, ',' , CartaoID, ',' ,
> PromocaoID, ',' , SessaoID, ',' , VendedorID, ')');
> // Showmessage(dm.Qq1.sql.text);
> dm.Qq1.execSQL;

Insert one row into "ingresso".

> // ########### Recording Tickets ###########
>
> // Pegando o Id do Bilhete no PostgreSQL
> dm.qQ1.SQL.clear;
> dm.qQ1.SQL.text:= Concat('select nextval(',QuotedStr('
> base.bilhete_id') , ')');
> dm.qQ1.open;
> BilheteID:= dm.qQ1.fieldByName('nextval').asString;
>
> dm.qQ1.SQL.clear;
> dm.qQ1.SQL.add(Concat('Insert into base.bilhete (id, estado,
> uso_sequencia, promocao_documento, assento_id, cartao_id, ingresso_id,
> promocao_id, sessao_id, vendedor_venda_id )'));
> dm.qQ1.SQL.add(Concat('values(', BilheteID, ',' ,
> QuotedStr(EstadoID), ',' , '0,0', ',' , QuotedStr(AssentoID), ',' ,
> QuotedStr(CartaoID), ',' , QuotedStr(IngressoID) , ',' ,
> QuotedStr(PromocaoID), ',' , QuotedStr(SessaoID) , ',' ,
> QuotedStr(VendedorID), ')' ) );
>
> dm.qQ1.execSQL;

Insert a row into "bilhete".

>
> end;

I don't see anything like "dm.database1.CommitTransaction" - are you
sure you are committing after the inserts?

One other point - if Delphi doesn't offer something like it, you might
find it useful to write a function that makes it easier to build queries:
my_db_func('INSERT INTO foo (id,a,b,c) VALUES (?,?,?,?)',
'NUM,TEXT,DATE,DATE',
variable1,variable2,variable3...);
I'd be surprised if there wasn't something like that already though.

--
Richard Huxton
Archonet Ltd