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Re: Concrete SQL from SQL::Abstract?

by CountZero (Bishop)
on May 13, 2010 at 19:32 UTC ( #839894=note: print w/replies, xml ) Need Help??


in reply to Concrete SQL from SQL::Abstract?

This will do what you want.
use 5.012; use strict; use warnings; use SQL::Abstract; my $sql = SQL::Abstract->new; my $table ='atable'; my %data = (a=>q/NULL/,b=>1,c=>q/'string and string'/); my $stmt_and_val = $sql->generate('INSERT INTO', \$table, \%data); say $stmt_and_val;
Output:
INSERT INTO atable SET a = NULL, b = 1, c = 'string and string'
And yes, unfortunately, you will have to take care of quoting the data yourself.

CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

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Re^2: Concrete SQL from SQL::Abstract?
by benizi (Hermit) on May 13, 2010 at 20:20 UTC
    And yes, unfortunately, you will have to take care of quoting the data yourself.

    ...that's half the point of my question, and being forced to use 'generate' defeats the benefit of using SQL::Abstract.

    Nonetheless, thanks. I'd glossed over the generate function in the first place, and the following is sufficient for simple inserts:

    my $dbh = DBI->Connect(@params); # initialized elsewhere my $sqlgen = SQL::Abstract->new; my %data = (a => undef, b => 1, c => q/'string and string'/); $_ = $dbh->quote($_) for values %data; print scalar $sqlgen->generate('insert into',\'atable',\%data); __END__ # prints: INSERT INTO atable SET a = NULL, b = '1', c = '\'string and string\''

    (Not sure whether the way it's quoting might cause trouble with, e.g., ZIP codes, where '08540' <> 8540...)

    Still interested in a broader solution.

      Dang. In addition to not noticing the slightly odd insert into X set field=value, field2=value2 syntax (as opposed to the 'insert' method's more standard insert into (fields) values (values)), I didn't realize there's weirdness with question marks:

      my %data = ( url => "http://foo/bar?baz", asdf => 1, thing => \'now()' + ); $_ = (ref) ? $_ : $dbh->quote($_) for values %data; print scalar $sqlgen->generate('insert into',\'atable',\%data); __END__ Use of uninitialized value in substitution iterator at /usr/lib/perl5/ +vendor_perl/5.10.0/SQL/Abstract.pm line 1290. INSERT INTO atable SET asdf = '1', thing = now(), url = 'http://foo/ba +rbaz'

      Seems this simply isn't the general use-case for 'generate'.

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