Byron Nikolaidis wrote: <blockquote type="CITE">Jose Soares wrote: <br />> <br />> Sorry I forgot to send the
attachement :) <br />> <br />> Jose Soares wrote: <br />> <br />> > Please help! <br />> > <br
/>>> The PSQLODBC aborts a transaction with a strange error while execute a <br />> > legal query. <br
/>>> The message is: <br />> > <br />> > "Could not begin a transaction; unexpected protocol
characterfrom <br />> > backend (sen_query) (#1)" <br />> > <br />> > I tried the same query with
psqlclient and it works with no problems. <br />> > <br />> > Does anyone know what this message means ?
<br/>> > <br />> > My configuration: <br />> > <br />> > Data base server: PostgreSQL v6.5.2
<br/>> > OS server: Linux 2.0.37 (Debian) <br />> > Win Client: M$_Access95 <br />> > PsqlODBC
v6.40.0006<br />> > log file attached. <br />> > <br />> > Any help would be very apreciated. <br
/>>> <br />> > José <br />> <br />>
------------------------------------------------------------------------<br />> Name:
LOG_ERROR.log<br />> LOG_ERROR.log Type: Text Document (application/x-unknown-content-type-txtfile) <br
/>> Encoding: base64 <p>The error means the driver didn't receive the expected response <br
/>characterfrom the backend. For queries, the expected response would be <br />something like: <p>'T': results are
coming(this one is the most likely expected) <br />'C': no tuples produced <br />'Z': ready for new query (in >=
postgres6.4 only). <br />'I': empty query produces this response <br />'N': notice <br />'E': error <p>In your case,
thequery begins: (SELECT "figure"."azienda" <p>It might be the extra parenthesis around the query ? Try removing <br
/>them. If that's not it, try making the query really short, just as an <br />experiment. Also, using the wrong
protocolwith the backend can make <br />this happen. <p>Byron</blockquote><u>* About parenthesis around select this is
theway M$-access translates</u><br /><u>queries with UNIONs and I can't do nothing to change this behavior.</u><br
/><u>Thanksto developers, PostgreSQL now recognizes this syntax, in fact if I execute this query on psql</u><br /><u>it
works.</u><p><u>*Just for an experiment I did the following change:</u><u></u><p><u>* The original query in M$-access
was:</u><br/>( <br />SELECT figure.azienda ,figure.codice_figura ,utenti.ragione_sociale ,utenti.istat ,utenti.cap, <br
/> utenti.indirizzo ,utenti.civico ,figure.tipo ,utenti.codice_fiscale ,utenti.partita_iva , <br />
figure.fine_attivita,figure.data_esportazione ,figure.data_aggiornamento ,utenti.distretto, <br /> figure.gruppo
,figure.data_esportazione,utenti.data_esportazione <br />FROM figure INNER JOIN utenti ON (figure.codice_figura =
utenti.azienda)<br />WHERE (figure.tipo IN ('D' ,'DB' ,'DO' ,'DS' ) ) <br /> ) <br />UNION ALL <br />( <br />SELECT
figure.azienda,figure.codice_figura ,utenti.ragione_sociale ,utenti.istat , <br /> utenti.cap
,utenti.indirizzo,utenti.civico,figure.tipo,utenti.codice_fiscale,<br /> utenti.partita_iva ,figure.fine_attivita
,figure.data_esportazione,<br /> figure.data_aggiornamento,utenti.distretto,figure.gruppo,figure.data_esportazione,
<br/> utenti.data_esportazione <br />FROM figure INNER JOIN utenti ON (figure.codice_figura = utenti.azienda) <br
/>WHERE(figure.tipo IN ('P' ,'PB' ,'PO' ,'PS' ,'A' ) ) <br />) <p><u>and it was translated to PostgreSQL
as:</u><p>(SELECT"figure"."azienda" ,"figure"."codice_figura" ,"utenti"."ragione_sociale" ,"utenti"."istat"
,"utenti"."cap","utenti"."indirizzo" ,"utenti"."civico" ,"figure"."tipo" ,"utenti"."codice_fiscale"
,"utenti"."partita_iva","figure"."fine_attivita" ,"figure"."data_esportazione" ,"figure"."data_aggiornamento"
,"utenti"."distretto","figure"."gruppo" ,"figure"."data_esportazione" ,"utenti"."data_esportazione" <br />FROM
"figure","utenti"<br />WHERE (("figure"."tipo" IN ('D' ,'DB' ,'DO' ,'DS' ) ) <br />AND ("figure"."codice_figura" =
"utenti"."azienda") ) <br />) <br />UNION ALL <br />( <br />SELECT "figure"."azienda" ,"figure"."codice_figura"
,"utenti"."ragione_sociale","utenti"."istat" ,"utenti"."cap" ,"utenti"."indirizzo" ,"utenti"."civico" ,"figure"."tipo"
,"utenti"."codice_fiscale","utenti"."partita_iva" ,"figure"."fine_attivita" ,"figure"."data_esportazione"
,"figure"."data_aggiornamento","utenti"."distretto" ,"figure"."gruppo" ,"figure"."data_esportazione"
,"utenti"."data_esportazione"<br />FROM "figure","utenti" <br />WHERE (("figure"."tipo" IN ('P' ,'PB' ,'PO' ,'PS' ,'A'
)) <br />AND ("figure"."codice_figura" = "utenti"."azienda" ) ) <br />) <p><u>I replaced the keyword INNER with LEFT
andnow it works but I can't realize why.</u><u></u><p><u>Any ideas Byron ?</u><u></u><p><u>Thanks,</u><br
/><u>José</u><br/><u></u>