Q. How do I access my MySQL database server using Perl programming language?
A. DBI is a generic interface for many databases. That means that you can write a script that works with many different database engines without change. You need a DataBase Driver (DBD) defined for each database type. For MySQL, this driver is called DBD::mysql.
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So you can connect Perl to your MySQL database server using the DBI Perl module. Here is small program.
Sample Perl code
Make sure you replace database name, MySQL server hostname, username and password according to your setup.
#!/usr/bin/perl -w
use DBI;
print "Content-type: text/html\n\n";
## mysql user database name
$db ="mysql";
## mysql database user name
$user = "vivek";
## mysql database password
$pass = "myPassword";
## user hostname : This should be "localhost" but it can be diffrent too
$host="localhost";
## SQL query
$query = "show tables";
$dbh = DBI->connect("DBI:mysql:$db:$host", $user, $pass);
$sqlQuery = $dbh->prepare($query)
or die "Can't prepare $query: $dbh->errstr\n";
$rv = $sqlQuery->execute
or die "can't execute the query: $sqlQuery->errstr";
print "<h3>********** My Perl DBI Test ***************</h3>";
print "<p>Here is a list of tables in the MySQL database $db.</p>";
while (@row= $sqlQuery->fetchrow_array()) {
my $tables = $row[0];
print "$tables\n<br>";
}
$rc = $sqlQuery->finish;
exit(0); |
#!/usr/bin/perl -w
use DBI;
print "Content-type: text/html\n\n";
## mysql user database name
$db ="mysql";
## mysql database user name
$user = "vivek";
## mysql database password
$pass = "myPassword";
## user hostname : This should be "localhost" but it can be diffrent too
$host="localhost";
## SQL query
$query = "show tables";
$dbh = DBI->connect("DBI:mysql:$db:$host", $user, $pass);
$sqlQuery = $dbh->prepare($query)
or die "Can't prepare $query: $dbh->errstr\n";
$rv = $sqlQuery->execute
or die "can't execute the query: $sqlQuery->errstr";
print "<h3>********** My Perl DBI Test ***************</h3>";
print "<p>Here is a list of tables in the MySQL database $db.</p>";
while (@row= $sqlQuery->fetchrow_array()) {
my $tables = $row[0];
print "$tables\n<br>";
}
$rc = $sqlQuery->finish;
exit(0);
Save and upload above program.
Posted by: Vivek Gite
The author is the creator of nixCraft and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.
14 comment
I’ve looked at a lot of sample code trying to learn how to successfully get extract any information from a database and this has been the first that actually worked! Kudos. Very helpful.
Hi Nixcraft,
Thanks for this code but i got the following:
– I copy the code and paste it in this file checkdb.sh.
– And run chmod +x checkdb.sh
– Then run ./checkdb.sh
Then the following occured:
Name “main::rv” used only once: possible typo at /usr/bin/check.db line 25.
Name “main::rc” used only once: possible typo at /usr/bin/check.db line 42.
Content-type: text/html
********** My Perl DBI Test ***************
Here is a list of tables in the MySQL database mysql.
columns_priv
db
event
func
general_log
help_category
help_keyword
help_relation
help_topic
host
ndb_binlog_index
plugin
proc
procs_priv
servers
slow_log
tables_priv
time_zone
time_zone_leap_second
time_zone_name
time_zone_transition
time_zone_transition_type
user
[root@drbl-01 ~]#
Currently installed Perl Modules:
[root@drbl-01 DBD-mysql-4.010]# instmodsh
Available commands are:
l – List all installed modules
m – Select a module
q – Quit the program
cmd? l
Installed modules are:
DBD::mysql
DBI
Perl
cmd? q
ANy suggestion on how to fix this?
Thanks again!
Stone
Stone
remove $rv = and $rc = they are not needed on those lines.
I have to synchronize bugzilla which uses mysql and HP quality centre which uses mssql .. i’m tryin to do this in perl.. As a fresher i’m not sure wat perl can do .. can anyone suggest me
This really does work. After 3 days of searching this is the first script that works.
THANK YOU!!!!!!!
Works beautifully! Thank you :)
It’s working very well
thank you.
Works like a champ!
My only significant modifications were “use strict” which means adding “my” to declare all the variables.
It would be nice if it also had an example of adding parameters to the prepared statement. I happened to look that up separately, which I’m adding to this comment in case someone else finds it useful.
Example: list every row where the user_id starts with “a”.
$sql = "select user_id from users where user_id like ?"; $sth = $dbh->prepare($sql) or die(DBI->errstr); $sth->bind_param(1, "a%"); $rv = $sth->execute or die(DBI->errstr); print "User ID's that start with 'a'\n"; while (my @row = $sth->fetchrow_array()) { my $tables = $row[0]; print "$tables\n"; } $rc = $sth->finish;Results (from my table):
User ID’s that start with ‘a’
Thank you!
What extention should I use while saving the program? An does it need any compiler or IDM ? Thanks
Thanks a lot,
I have been searching for this, past 4 days.
Can you please share script to connect excel file into perl.
Please…..
Thanks in Advance.
I’ve got an error when I installed the DBI::mysql via cpan.I am using ec2(ubuntu 14) and rds(mysql). In my ec2 I’ve already DBI via cpan. When I install DBI::mysql, I’ve got an error.
cpan[1]> install DBI::mysql
Here I am able to create a datbase after running the script .(connection.pl)
like ./connection.pl
Please correct below script if its incorrect .But its not working .
I want to write script which will ask to user to create database name ,user name and passowrd after running the script..(User can give the input from keyborad)
like Please enter the Databse Name if not exists .
#!/usr/bin/perl use DBI; use strict; my $driver = "mysql"; my $database = ; my $userid = ; my $password = ; my $dsn = "DBI:$driver:database=$database"; my $dbh = DBI->connect($dsn, $userid, $password ) or die $DBI::errstr; print "Database connected :$dbh\n"; $dbh->do("Create database $database "); print ("Datbase Created ");This worked well for me. Very easy to follow. I too use ‘strict’ and had to add my to the various variables but other than that it was a great find.
Thanks
Doug Marker