I get: Can't call method ... without a package or object reference
Run your script with the -w switch or test your connect and query statements on success or failure.
#WRONG:
$db = Msql->connect();
#RIGHTish:
$db = Msql->connect or die "Couldn't connect to....: $Msql::db_errstr";
#WRONG:
$sth = $db->query("some query");
#RIGHTish:
$sth = $db->query("some query") or die "Query failed: $Msql::db_errstr";I don't understand how you retrieve the data from a SELECT Query with Msql Perl.
Precanned reply:
read the README
read the manpage
read the FAQ that comes with MsqlPerl
read the tutorial in t/msql.tsubscribe to the msqlperl mailing list by sending mail to msqlperl-request@franz.ww.tu-berlin.de with "subscribe msqlperl your.name@your.domain" in the body of the message. Ask the question to the mailing list by writing to msqlperl@franz.ww.tu-berlin.de. Wait for the answer. Keep subscribed to the mailing list and answer the same question as soon as somebody else asks it.
How do I get the names of the fields after a listfields?
Please, read the manpage. Type 'man Msql' and if that doesn't help, try 'perldoc Msql'.
Where can I find more documentation?
Msql.pm IS the manpage in pod format. If you're on UNIX you should be able to read it with 'man Msql'. On other operating systems try 'perldoc Msql'. Also, the test script, t/msql.t might help you to sort things out. The most recent addition is the pmsql program which may also help you to learning by example.
HPUX compilation goes wrong!!!
From: Yiorgos Adamopoulos <Y.Adamopoulos@noc.ntua.gr>
I successfully compiled MsqlPerl for a HP817 (HP-UX 9.04/s800) using Perl5.002,
msql-1.0.14 and gcc-2.7.2. I added CC_ONLY = -fPIC to site.mm after running
setup.How do I retrieve fields by name?
The internal fetchhash routine is quite good. If you need speed, you should hardcode your column names into a hash slice. Everything else is a terrible waste.
closure: 8 secs ( 7.47 usr 0.03 sys = 7.50 cpu)
hashslice via name: 10 secs ( 9.51 usr 0.04 sys = 9.55 cpu)
internal_fetchhash: 7 secs ( 7.05 usr 0.03 sys = 7.08 cpu)
brute force fetchhash: 15 secs (13.90 usr 0.05 sys = 13.95 cpu)
hashslice via constants: 6 secs ( 5.57 usr 0.02 sys = 5.59 cpu)
#!/usr/bin/perl
use Msql;
my $db = Msql->Connect("","mod");
$sth = $db->Query("select * from mods");
sub Msql::Statement::brute_fetchhash {
my $self = shift;
my %hash;
@hash{ $self->name } = $self->FetchRow and \%hash;
}
sub Msql::Statement::gimme_a_fetchhash_routine {
my $self = shift;
my @z = $sth->name;
sub { my %hash; @hash{@z} = $self->FetchRow and \%hash;};
}
use Benchmark;
timethese(20, {
'hashslice via constants' => q{
$sth->DataSeek(0);
while (@row{qw/modid userid maillistid chapterid seqdummy statd stats statl stati description changed changedby/} = $sth->FetchRow){
$X = $row{modid};
print "$X\n" ;
}
},
' hashslice via name' => q{
$sth->DataSeek(0);
while (@row{$sth->name} = $sth->FetchRow){
$X = $row{modid};
print "$X\n" ;
}
},
' brute force fetchhash' => q{
$sth->DataSeek(0);
while ($hashref = $sth->brute_fetchhash){
$X = $hashref->{modid};
print "$X\n" ;
}
},
' closure' => q{
$sth->DataSeek(0);
$clos = $sth->gimme_a_fetchhash_routine;
while ($hashref = &$clos){
$X = $hashref->{modid};
print "$X\n" ;
}
},
' internal_fetchhash' => q{
$sth->DataSeek(0);
while (%hash = $sth->fetchhash){
$X = $hash{modid};
print "$X\n" ;
}
},
});Dynamic Loading
Hello I am running XXX and would really like to use Msqlperl but I am getting this error message.
Can't load module Msql, dynamic loading not available in this perl.
(You may need to build a new perl executable which either supports
dynamic loading or has the Msql module statically linked into it.)
at /usr/lib/perl5/site_perl/Msql.pm line 56
BEGIN failed--compilation aborted at ./sql.pl line 5.There is a manpage dedicated to building and installing modules: ExtUtils::MakeMaker. The long answer is in there. The short answer is: run 'make perl' in the MsqlPerl build directory. The third answer is, get an operating system that supports dynamic loading. With Linux it's already quite standard to have dynamic loading, and so is with many other OSs. Check out the newgroups for your OS and consult the FAQs there.
How can I construct an insert statement from an array?
The icc routine below should do what you want. It's hardly tested and I'm reluctant to add it to the distribution. But feel free to convince me that including it is a good thing.
#!/usr/bin/perl -w
use Msql;
use strict;
sub Msql::icc {
my($db,$table,@fields)=@_;
my($s,@types)=$db->listfields($table) or return;
if (@fields){
# The user wants to input the fields in a different order
my(@tfields,@ttypes,%tfields);
@tfields = $s->name;
@ttypes = $s->type;
@tfields{@tfields} = @ttypes;
@types = @tfields{@ttypes};
} else {
# They are gonna give the arguments in table's order
@fields = $s->name;
@types = $s->type;
}
# return a subroutine reference.
sub {
my(@arr)=@_;
return join " ",
"insert into $table values (",
join(
",",
map {
defined $arr[$_] ?
$types[$_] == &Msql::REAL_TYPE
||
$types[$_] == &Msql::INT_TYPE ?
$arr[$_]+0 :
Msql->quote($arr[$_]) :
"NULL"
}
0..$#types
),
")\n";
}
}
# Example for usage:
{
my $dbh=Msql->connect("","test");
my $f=$dbh->icc("pwent");
my(@info,$query,$sth);
while (@info = getpwent()) {
print $query =&$f(@info);
$sth = $dbh->query($query) or die Msql->errmsg;
}
}We also got email from Doug Wilson who pounded on the icc method:
Date: Thu, 1 May 1997 14:23:31 -0500 (CDT)
From: Doug Wilson <doug@hurl.net>
To: msqlperl@franz.ww.tu-berlin.de
After debugging the sample insert function from the installation FAQ,
I added an extra feature; now not only are strings automatically quoted
correctly (as before), they are also truncated to their database length.
my sample:
#!/usr/bin/perl
# tabstop=4
use lib '/usr/local/Minerva/perl';
use Msql;
sub Msql::icc
{
my($db,$table,@fields)=@_;
my($s,@types)=$db->listfields($table) or die Msql->errmsg;
my $tfld_idx = 0;
if (@fields){
# The user wants to input the fields in a different order
my(@tfields,@ttypes,@tlengths,%tmptypes,%tmplengths,$fieldname);
@tfields = $s->name;
@ttypes = $s->type;
@tmptypes{@tfields} = @ttypes;
@tlengths = $s->length;
@tmplengths{@tfields} = @tlengths;
foreach $fieldname (@fields) {
$types[$tfld_idx]=$tmptypes{$fieldname};
$lengths[$tfld_idx++]=$tmplengths{$fieldname};
}
} else {
# They are gonna give the arguments in table's order
@fields = $s->name;
@types = $s->type;
@lengths = $s->length;
}
# return a subroutine reference.
sub {
my(@arr)=@_;
return join " ",
"insert into $table",
$tfld_idx > 0 ?
join(" ", "(", join(",", @fields), ")") : "",
"values (",
join(",",
map {
defined $arr[$_] ?
$types[$_] == &Msql::REAL_TYPE
||
$types[$_] == &Msql::INT_TYPE ?
$arr[$_]+0 :
Msql->quote(
substr($arr[$_],0,$lengths[$_]))
:
"NULL"
}
0..$#types
),
")\n";
}
}
#Sample Usage
my ($regfile) = "7094.reg";
my(%regvars,%dbvars);
#Read in keys & values
if (open (REGFILE, "<$regfile"))
{
while (<REGFILE>)
{
$line = $_;
chomp($line);
($key, $value) = split(/=/, $line);
$regvars{$key} = $value;
}
close (REGFILE);
}
#Do the file to database field translation
$dbvars{user}=$regvars{Pppname};
$dbvars{lname}=$regvars{LastName};
$dbvars{fname}=$regvars{FirstName};
$dbvars{address1}=$regvars{Address};
$dbvars{address2}=$regvars{Address1};
$dbvars{city}=$regvars{City};
$dbvars{state}=$regvars{State};
$dbvars{zip}=$regvars{Zip};
$dbvars{country}=$regvars{Country};
$dbvars{hphone}=$regvars{Phone};
$dbvars{email}=$regvars{EmailName};
$dbvars{epasswd}=$regvars{EmailPassword};
$dbvars{ppp}=$regvars{PppName};
$dbvars{ppasswd}=$regvars{PppPassword};
$dbvars{regcode}=$regvars{RegCode};
$dbvars{serial}=$regvars{RegNumber};
$dbh=Msql->connect("","ispreg");
my @fnames = keys(%dbvars);
my $f=$dbh->icc("customers", @fnames);
my(@info,$query,$sth);
@info = values(%dbvars);
$query = &$f(@info);
$sth = $dbh->query($query) or die Msql->errmsg;
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to msqlperl-request@franz.ww.tu-berlin.deWhat can I do if I can't connect to local msql server
Date: Sun, 27 Apr 1997 15:52:16 -0400 (EDT)
From: Mark-Jason Dominus <mjd@plover.com>
To: msql-list@Bunyip.Com
Subject: Re: [mSQL] linux: can't connect to local msql server
On Sun, 27 Apr 1997, Rob Hill wrote:
> I have the msql.sock devices in my /usr/local/Hughes dir but I cannot
> connect to msql locally.
When I installed msql2, it put the socket into
/usr/local/Hughes/msql.sock, but the perl Msql.pm module wanted to
find it under /dev/msql. I made a symbolic link from /dev/msql to
/usr/local/Hughes/msql.sock.
I did
strace -o /tmp/msqlperl perl testprogram
grep connect /tmp/msqlperl
to find out where Msql was looking for the socket file.
mjd@pobox.com Mark-Jason Dominus
mjd@plover.com Plover Systems, Philadelphia, PA