On Tue, 2011-08-30 at 19:29 +0100, Dave Page wrote: > On Tue, Aug 30, 2011 at 6:15 PM, Guillaume Lelarge > <guilla...@lelarge.info> wrote: > >> > >> libpq doesn't support multiple resultsets in a single query unfortunately. > >> > > > > As a matter of fact, it does (see > > http://pgolub.wordpress.com/2009/11/17/script-slicing-by-pgmdd/), and I > > really want pgAdmin to use this. Still need to find a good UI and some > > time to work on it :) > > Err, no it doesn't. The blog you've referenced describes how PgMDD > takes the PostgreSQL 8.3 parser and uses it to pre-parse scripts into > individual statements on the client, which it then executes > individually. That's similar to what's being asked for here, but has > the rather nasty limitation of not understanding PG 8.4+'s grammar. > > Libpq itself only supports a single resultset for multi-part > statements. Even in 9.1, the docs say: > > The command string can include multiple SQL commands (separated by > semicolons). Multiple queries sent in a single PQexec call are > processed in a single transaction, unless there are explicit > BEGIN/COMMIT commands included in the query string to divide it into > multiple transactions. Note however that the returned PGresult > structure describes only the result of the last command executed from > the string. Should one of the commands fail, processing of the string > stops with it and the returned PGresult describes the error condition. > > (http://www.postgresql.org/docs/9.1/static/libpq-exec.html#LIBPQ-EXEC-MAIN) > > In other words, only the last resultset is accessible. >
You're right for PQexec. And wrong for PQsendQuery, which is the one we use on the query tool. And to quote the fine manual :) (http://www.postgresql.org/docs/9.1/static/libpq-async.html#LIBPQ-PQSENDQUERY): After successfully calling PQsendQuery, call PQgetResult one or more times to obtain the results. PQsendQuery cannot be called again (on the same connection) until PQgetResult has returned a null pointer, indicating that the command is done. -- Guillaume http://blog.guillaume.lelarge.info http://www.dalibo.com -- Sent via pgadmin-support mailing list (pgadmin-support@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgadmin-support
