[SOLVED] connecting mysql using perl

zak100 · 09-26-2013, 04:01 AM

Hi,
I am trying to connect with mysql data base using perl but i am getting DBI error problem. I have search the web but i am not able to find any solution.
I am able to display the table using mysql

Code:

[guest@HP-UX608YY ~]$ su
Password: 
[root@HP-UX608YY guest]# service mysqld start
Starting MySQL:                                            [  OK  ]
[root@HP-UX608YY guest]# mysql -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.0.67 Source distribution

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.




mysql> use perltest;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed



mysql> select * from samples;
+----+------+----------+
| id | name | phone    |
+----+------+----------+
|  1 | abc  | 555-5555 | 
|  2 | xyz  | 555-6666 | 
+----+------+----------+
2 rows in set (0.02 sec)

mysql>

My perl code is :

Code:

guest@HP-UX608YY zulfi]$ cat p1.pl
#!/usr/bin/perl
use DBI;
$dbh = DBI->connect('dbi-mysql:perltest:samples','root','')
or die "connection error DBI::errstr\n";
$sql ="select * from samples";

I am getting following error:

Code:

[guest@HP-UX608YY zulfi]$ perl p1.pl
Can't connect to data source 'dbi-mysql:perltest:samples' because I can't work out what driver to use (it doesn't seem to contain a 'dbi:driver:' prefix and the DBI_DRIVER env var is not set) at p1.pl line 3

Somebody plz help me.

Zulfi.

druuna · 09-26-2013, 04:17 AM

Try this:

Code:

#!/usr/bin/perl
use strict ;
use warnings ;

my $dbh ;
my $sql ;

use DBI ;

$dbh = DBI->connect( 'DBI:mysql:perltest', 'root', 'pwd_goes_here' ) || die "Could not connect to database: $DBI::errstr" ;

$sql = "select * from samples" ;

Perl DBI examples for DBD::mysql

zak100 · 09-26-2013, 11:36 PM

Hi,
Thanks for your reply. It helped me but now i am getting some other errors while displaying the contents of db. My code is now:

Code:

#!/usr/bin/perl
use strict ;
use warnings ;

my $dbh ;
my $sql ;

use DBI ;

$dbh = DBI->connect( 'DBI:mysql:perltest', 'root', '' ) || die "Could not connect to database: $DBI::errstr" ;

$sql = "select * from samples" ;
$sth = $dbh->prepare($sql);
$sth->execute or die "SQL error $DBI::errstr\n";
while (@row = $sth->fetchrow_array)
{
print "@row\n";}

~

The errors are:

Code:

[guest@HP-UX646UU zulfi]$ cat p3.pl
#!/usr/bin/perl
use strict ;
use warnings ;

my $dbh ;
my $sql ;

use DBI ;

$dbh = DBI->connect( 'DBI:mysql:perltest', 'root', '' ) || die "Could not connect to database: $DBI::errstr" ;

$sql = "select * from samples" ;
$sth = $dbh->prepare($sql);
$sth->execute or die "SQL error $DBI::errstr\n";
while (@row = $sth->fetchrow_array)
{
print "@row\n";}

[guest@HP-UX646UU zulfi]$ perl p3.pl
Possible unintended interpolation of @row in string at p3.pl line 17.
Global symbol "$sth" requires explicit package name at p3.pl line 13.
Global symbol "$sth" requires explicit package name at p3.pl line 14.
Global symbol "@row" requires explicit package name at p3.pl line 15.
Global symbol "$sth" requires explicit package name at p3.pl line 15.
Global symbol "@row" requires explicit package name at p3.pl line 17.
Execution of p3.pl aborted due to compilation errors.
[guest@HP-UX646UU zulfi]$

Plz guide me. I executed this sort of program on these computers on year ago but now its not working.

Zulfi.

zak100 · 09-27-2013, 12:17 AM

Hi,
I have used the show tables commands and its also showing me the correct table. Plz guide how to solve this error.

Code:

mysql> use perltest;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> show tables
    -> ;
+--------------------+
| Tables_in_perltest |
+--------------------+
| items              | 
| samples            | 
| samples2           | 
| subcribers         | 
+--------------------+
4 rows in set (0.12 sec)

mysql>

Zulfi.

pan64 · 09-27-2013, 12:53 AM

you can try to insert the following line into that p3.pl (line 7):
my @row, $sth;

chrism01 · 09-27-2013, 12:53 AM

You'll find these useful, but note to start with that 'use strict;' (highly recommended) requires you to declare vars before use eg 'my $var;'

http://www.perlmonks.org/?node=Tutorials
http://www.perlmonks.org/?node_id=284436
http://www.tizag.com/perlT/index.php

druuna · 09-27-2013, 01:39 AM

@zak100: Here's an article that explains why you should use use strict and use warnings (and possibly use diagnostics):
- Use strict warnings and diagnostics or die

In short:

- use warnings ; # turns on all sorts of warnings about probable errors.
- use strict ; # generates compile and run-time errors for certain unsafe constructs.

The above two should always be used when programming in perl.

This one might come in handy when you want more details. Not always needed but a good one to know.
- use diagnostics ; # optional; causes warnings to be explained in greater detail.

zak100 · 09-28-2013, 10:25 AM

Hi,
Thanks fellows. I am able to catch my error. I was using a '-' instead of colon. Now its working.

Code:

$dbh = DBI->connect('dbi-mysql:perltest:samples','root','')

Thanks for your support in this problem.

Zulfi.