in reply to prepare statement within DBI
Whatever your database driver accepts as a valid SQL statement is fine as far as the DBI is concerned. Thus, if Oracle accepts a query like "SELECT COUNT(*) from t1; SELECT COUNT(*) from t2;" so you can do it.
If that is not the case, you can force that behavior with some SQL features:
my $query = qq{ select "t1" as t, count(*) as c from table_one UNION ALL select "t2", count(*) from table_two }; # Gives # +----+---+ # | t | c | # +----+---+ # | t1 | 4 | # | t2 | 2 | # +----+---+ my $table_status = $dbh->selectall_arrayref($query, {Slice => {}} ); # $table_status = [ # { t => 't1', c => 4 }, # { t => 't2', c => 2 } # ];
Or:
my $query = qq{ SELECT ( select count(*) from table_one ) AS t1, ( select count(*) from table_two ) AS t2; }; # Gives # +----+----+ # | t1 | t2 | # +----+----+ # | 4 | 2 | # +----+----+ my @table_status = $dbh->selectrow_array($query); # @table_status = ( 4, 2 );
I would personally recommend against this, since I prefer to have better control on my SQL statements. However, if you know what you're doing, it's up to you to decide.
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Re^2: prepare statement within DBI
by Velaki (Chaplain) on Aug 25, 2004 at 18:09 UTC |
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Seekers of Perl Wisdom