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Re: Placeholders and Negative Numbers..

by jZed (Prior)
on Dec 11, 2007 at 17:17 UTC ( #656434=note: print w/replies, xml ) Need Help??


in reply to Placeholders and Negative Numbers..

From the DBI documentation for $sth->rows():
Generally, you can only rely on a row count after a non-SELECT execute (for some specific operations like UPDATE and DELETE), or after fetching all the rows of a SELECT statement. For SELECT statements, it is generally not possible to know how many rows will be returned except by fetching them all.
So $sth->rows() is, by definition, the wrong thing to use with SELECT statements and is not guaranteed to give you the answer you expect. Do as the docs say and count the fetches or else do a separate COUNT query.
  • Comment on Re: Placeholders and Negative Numbers..

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[1nickt]: tobyink perl -MTypes::Standard= is_Int -Mstrict -wE 'say 1 if is_Int 1.0'
[jdporter]: so that I can use the existing expand unix util. Otherwise, I'll probably use Text::Tabs.
[1nickt]: pryrt I guess I don;t really care if user 42 logs on as 42.0 ... more of an academic question at this point.
[LanX]: jdporter: open PIPE,'-|' ?
[LanX]: oh you want the result line by line?
[jdporter]: ok, LanX, then what?
[jdporter]: It doesn't have to be line by line. Just "my program" "writes" to the external prog and also/then "reads" from it.
LanX open (You are not allowed to open to a command that pipes both in and out, but see IPC::Open2, IPC::Open3, and Bidirectional Communication with Another Process in perlipc for alternatives.)
[jdporter]: IPC::Open2, I guess
[jdporter]: yes, that

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