Before someone points out that my description of perl variables is incomplete:
Here are the extra details for the very curious:
https://perldoc.perl.org/perlguts#Datatypes
https://metacpan.org/pod/Scalar::Util
https://perldoc.perl.org/Scalar::Util#dualvar
https://perldoc.perl.org/Scalar::Util#isdual
https://perldoc.perl.org/Scalar::Util#isvstring
https://perldoc.perl.org/Scalar::Util#looks_like_number
https://metacpan.org/release/NWCLARK/perl-5.8.8/view/pod/perlapi.pod
https://metacpan.org/pod/POSIX::1003::Math
https://www.perl.com/pub/2012/06/perlunicook-further-resources.html/
https://perldoc.perl.org/perlapi
https://perldoc.perl.org/perlembed
https://perldoc.perl.org/Devel::Peek
https://www.nntp.perl.org/group/perl.perl5.porters/2015/11/msg232974.html
-Original Message-
From: Fennell, Brian
Sent: Monday, December 20, 2021 10:14 AM
To: john miky ; dbi-users@perl.org
Subject: RE: [EXTERNAL] Re: select decimal column from mysql
Variables in perl are “untyped” or better yet “dynamically typed”.
Every variable is a string but will behave like a int or float in the right
context.
Conversions from string to int to float and back to string happen automatically
and silently.
This may be surprising and confusing if you are coming from java.
Example:
perl -e '$v = "123" ; print $v . "\n" ; $v += 2 ; print $v . "\n"; $v /= 2.0 ;
print $v . "\n"; print length($v) . "\n"; $v = "(" . $v . ")"; print $v . "\n"'
123
125
62.5
4
(62.5)
From: john miky
Sent: Monday, December 20, 2021 1:28 AM
To: dbi-users@perl.org
Subject: [EXTERNAL] Re: select decimal column from mysql
sorry, please ignore this stupid question, 0.015 is > 0
On Mon, Dec 20, 2021 at 2:19 PM john miky <mailto:gb2...@gmail.com> wrote:
hmm. it is perl's "problem", not dbi.
On Mon, Dec 20, 2021 at 1:20 PM john miky <mailto:gb2...@gmail.com> wrote:
hi,
I select a decimal column, from mysql with dbi, the value 0.015 for example,
my ($v) = $dbh->selectrow_array("select price from test limit 1") it is greater
than 0 in perl.
What's the proper way to get a float value ?
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