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Re: DBI place holder for sub query problem

by jZed (Prior)
on Jan 02, 2008 at 19:08 UTC ( #660037=note: print w/ replies, xml ) Need Help??


in reply to DBI place holder for sub query problem

Generally, placeholders can only hold the place of *values*, not structural elements like table and column names and subselect queries. You can (for most DBDs, I believe) use placeholders for values in a subquery so something like this might work:

$sth=$dbh->prepare(" UPDATE tableA SET colA =( SELECT colB FROM tableB WHERE colC=? ) WHERE tableA.rec_no=? "); foreach my $row ( @rows ) { $sth->execute( $row->{'tableB.value'}, $row->{'tableA.value'} ) or die $dbh->errstr; }
Note that the order of the values in the execute is the order of the placeholders in the SQL, not the order the tables are opened.


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