Toying with ORM but it seems much harder than juts writing plain straight SQL (yes I like SQL - it is GOOD). Anyway given table:
create table stocks_daily
(
exchange char(10) NOT NULL,
symbol char(10) NOT NULL,
date datetime NOT NULL,
o real NOT NULL,
h real NOT NULL,
l real NOT NULL,
c real NOT NULL,
volume int NOT NULL,
adjust real NOT NULL
);
How do I return the MAX(c) (which is close price)?
I have wasted lots of time on this and best I came up with is:
# get the max:
my $high = $quote_model->search(
{
symbol => $symbol,
date => { '>=' => $date},
},
{'select' => [ { max => 'c', } ], }
)->single();
print "high: ", $high->c, "\n";
The syntax is way whacky - This is far more complex than:
select Max(c) from stocks_daily where symbol = '?' and date >= '?'
Anyway I always get error "Use of uninitialized value .."
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
| |
For: |
|
Use: |
| & | | & |
| < | | < |
| > | | > |
| [ | | [ |
| ] | | ] |
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.