Обсуждение: Connect to postgresql database using Perl

Hello

2010/3/31 dipti shah <shahdipti1980@gmail.com>:
> Hi,
>
> Could anyone please provide me an example to connect to a postgresql
> database using Perl language and accessing the tables, schemas, and other
> postgresql objects.
>

http://www.felixgers.de/teaching/perl/perl_DBI.html
http://structbio.vanderbilt.edu/chazin/wisdom/dbi_howto.html

Regards

Pavel Stehule

> Thanks,
> Dipti
>

dipti shah wrote:
> Thanks Guys. DBI works fine. I have written below code but it executes
> only on the server where I installed postgresql. Is there any way to
> run this code from remote host. I get an error when trying to run it
> from remote host. I think it is obvious because in below code there is
> no information where to connect to. Could you please help me out.
>
> use DBI;
> $DB_name    = 'mydb';
> $DB_user    = 'postgres';
> $DB_pwd     = '';
> $dbh = DBI->connect("dbi:Pg:dbname=$DB_name","$DB_user","$DB_pwd");
> ...

see http://search.cpan.org/~turnstep/DBD-Pg-2.16.1/Pg.pm#connect
<http://search.cpan.org/%7Eturnstep/DBD-Pg-2.16.1/Pg.pm#connect>

add ;host=hostname-or-ip to the connect string...

On Wed, Mar 31, 2010 at 3:25 AM, dipti shah <shahdipti1980@gmail.com> wrote:
> Thanks Guys. DBI works fine. I have written below code but it executes only
> on the server where I installed postgresql. Is there any way to run this
> code from remote host. I get an error when trying to run it from remote
> host. I think it is obvious because in below code there is no information
> where to connect to. Could you please help me out.

Hi, Dipti.

Have a look at the DBI documentation.  As you suspect, you will need
to specify the host.

Sean

> use DBI;
> $DB_name    = 'mydb';
> $DB_user    = 'postgres';
> $DB_pwd     = '';
> $dbh = DBI->connect("dbi:Pg:dbname=$DB_name","$DB_user","$DB_pwd");
> if ( !defined $dbh ) { die "Cannot connect to database!\n"; }
> $sth  = $dbh->prepare("SELECT * FROM mytable");
> $sth->execute();
> while ( ($id,$name) = $sth->fetchrow_array() ) {  print "$id\t\t $name \n";
> }
> $sth->finish();
> $dbh->disconnect();
>
> remote-host# perl pg-connect.pl
> DBI connect('dbname=sysdb','postgres',...) failed: could not connect to
> server: No such file or directory
>         Is the server running locally and accepting
>         connections on Unix domain socket "/tmp/.s.PGSQL.5432"? at
> pg-connect.pl line 7
> Cannot connect to database!
>
> Thanks,
> Dipti
>
> On Wed, Mar 31, 2010 at 11:53 AM, Pavel Stehule <pavel.stehule@gmail.com>
> wrote:
>>
>> Hello
>>
>> 2010/3/31 dipti shah <shahdipti1980@gmail.com>:
>> > Hi,
>> >
>> > Could anyone please provide me an example to connect to a postgresql
>> > database using Perl language and accessing the tables, schemas, and
>> > other
>> > postgresql objects.
>> >
>>
>> http://www.felixgers.de/teaching/perl/perl_DBI.html
>> http://structbio.vanderbilt.edu/chazin/wisdom/dbi_howto.html
>>
>> Regards
>>
>> Pavel Stehule
>>
>> > Thanks,
>> > Dipti
>> >
>
>