Beefy Boxes and Bandwidth Generously Provided by pair Networks
laziness, impatience, and hubris
 
PerlMonks  

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.

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://660037]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others romping around the Monastery: (4)
As of 2016-10-01 20:38 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    How many different varieties (color, size, etc) of socks do you have in your sock drawer?






    Results (7 votes). Check out past polls.