How to access MySQL database using Perl

Posted on in Categories , last updated September 19, 2008

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.

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);

Save and upload above program.

14 comment

  1. 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.

  2. 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
    [[email protected] ~]#

    Currently installed Perl Modules:

    [[email protected] 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

  3. 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

  4. 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’

    admin
    alameda
    arthur
  5. 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.

  6. 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

    Reading '/home/ubuntu/.cpan/Metadata'
    Database was generated on Sun, 10 Aug 2014 14:06:13 GMT
    Warning: Cannot install DBI::mysql, don't know what it is.
    Try the command
    
    i /DBI::mysql/
    
    to find objects with matching identifiers.
    so i type i /DBI::mysql/ and I've got this message 
    
    nolock_cpan> i /DBI::mysql/                                                                                                                       
    Module  < Ambrosia::DataProvider::DBI::mysql (KNM/Ambrosia-0.010.tar.gz)
    Module  < AnyEvent::DBI::MySQL   (POWERMAN/AnyEvent-DBI-MySQL-1.0.5.tar.gz)
    Module  < AnyEvent::DBI::MySQL::db (POWERMAN/AnyEvent-DBI-MySQL-1.0.3.tar.gz)
    Module  < AnyEvent::DBI::MySQL::st (POWERMAN/AnyEvent-DBI-MySQL-1.0.3.tar.gz)
    Module  < AnyEvent::DBI::MySQL::st::ready (POWERMAN/AnyEvent-DBI-MySQL-1.0.3.tar.gz)
    Module  < Audio::DB::Adaptor::dbi::mysql (TWH/Audio-DB-0.01.tar.gz)
    Module  < Bio::DB::DBI::mysql    (CJFIELDS/BioPerl-DB-1.006900.tar.gz)
    Module  < Bio::DB::GFF::Adaptor::dbi::mysql (CJFIELDS/BioPerl-1.6.924.tar.gz)
    Module  < Bio::DB::GFF::Adaptor::dbi::mysqlace (CJFIELDS/BioPerl-1.6.924.tar.gz)
    Module  < Bio::DB::GFF::Adaptor::dbi::mysqlcmap (CJFIELDS/BioPerl-1.6.924.tar.gz)
    Module  < Bio::DB::GFF::Adaptor::dbi::mysqlopt (CJFIELDS/BioPerl-1.6.924.tar.gz)
    Module  < Bio::DB::SeqFeature::Store::DBI::mysql (CJFIELDS/BioPerl-1.6.924.tar.gz)
    Module  < CHI::t::Driver::DBI::mysql (JSWARTZ/CHI-Driver-DBI-1.24.tar.gz)
    Module  < Class::DBI::mysql      (TMTM/Class-DBI-mysql-1.00.tar.gz)
    Module  < Class::DBI::mysql::FullTextSearch (TMTM/Class-DBI-mysql-FullTextSearch-1.01.tar.gz)
    Module  < DBIx::Class::Fixtures::DBI::mysql (JJNAPIORK/DBIx-Class-Fixtures-1.001021.tar.gz)
    Module  < DBIx::Class::Schema::Loader::DBI::mysql (ILMARI/DBIx-Class-Schema-Loader-0.07041.tar.gz)
    Module  < DBIx::Class::Storage::DBI::mysql (RIBASUSHI/DBIx-Class-0.08270.tar.gz)
    Module  < DBIx::Class::Storage::DBI::mysql::backup (NGS/DBIx-Class-Storage-DBI-mysql-backup-0.04.tar.gz)
    Module  < DBIx::Skinny::Schema::Loader::DBI::mysql (NEKOYA/DBIx-Skinny-Schema-Loader-0.25.tar.gz)
    Module  < DBO::Handle::DBI::mysql (ABW/DBO-0.01.tar.gz)
    Module  < JAF::DBI::mysql        (GRISHACE/Apache-JAF-0.21.tar.gz)
    Module  < NoSQL::PL2SQL::DBI::MySQL (TQISJIM/NoSQL-PL2SQL-1.21.tar.gz)
    Module  < NoSQL::PL2SQL::DBI::MySQL::Schema (TQISJIM/NoSQL-PL2SQL-1.21.tar.gz)
    Module  < NoSQL::PL2SQL::DBI::MySQL::Schema::index (TQISJIM/NoSQL-PL2SQL-1.21.tar.gz)
    Module  < NoSQL::PL2SQL::DBI::MySQL::Schema::index::column (TQISJIM/NoSQL-PL2SQL-1.21.tar.gz)
    Module  < NoSQL::PL2SQL::DBI::MySQL::Schema::table (TQISJIM/NoSQL-PL2SQL-1.21.tar.gz)
    Module  < NoSQL::PL2SQL::DBI::MySQL::Schema::table::column (TQISJIM/NoSQL-PL2SQL-1.21.tar.gz)
    Module  < ORM::Db::DBI::MySQL    (AKIMOV/ORM-0.85.1.tar.gz)
    Module  < ORM::Db::DBI::MySQLemTa (AKIMOV/ORM-0.85.1.tar.gz)
    Module  < RDF::Trine::Store::DBI::mysql (GWILLIAMS/RDF-Trine-1.009.tar.gz)
    Module  < SPOPS::DBI::MySQL      (CWINTERS/SPOPS-0.87.tar.gz)
    Module  < SQL::Translator::Parser::DBI::MySQL (FREW/SQL-Translator-0.11018.tar.gz)
    Module  < SimpleDBI::mysql       (ABBYPAN/SimpleDBI-0.01.tar.gz)
    34 items found
    
    1. #!/usr/bin/perl
      use DBI;
      use strict;
      my $driver = "mysql"; 
      my $database = "TEST";
      my $dsn = "DBI:$driver:database=$database";
      my $userid = "BOOK";
      my $password = "BOOK123";
      my $dbh = DBI->connect($dsn, $userid, $password ) or die $DBI::errstr;
      print  "Database connected :$dbh\n";

      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 ");
  7. 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

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