# Simple interaction with database via DBI module

# DBI module

You should make sure that module DBI has been installed on your pc, then follow the bellow steps:

  1. use DBI module in your perl script

use DBI;

  1. Declare some primary parameters

my $driver = "MyDriver";

my $database = "DB_name";

my $dsn = "DBI:$driver:dbname=$database";

my $userid = "your_user_ID";

my $password = "your_password";

my $tablename = "your_table";

  1. Connect to your database

my $dbh = DBI->connect($dsn, $userid, $password);

  1. Prepare your query

my $query = $dbh->prepare("Your DB query");


$my_query = qq/SELECT * FROM table WHERE column1 = 2/;

my $query = $dbh->prepare($my_query);

We can also use variable in the query, like below:

my $table_name = "table";

my $filter_value = 2;

$my_query = qq/SELECT * FROM $table_name WHERE column1 = $filter_value/;

  1. Execute your query


*Note: To avoid injection attack, you should use placeholders ? instead of put your variable in the query.

Ex: you want to show the all data from 'table' where column1=$value1 and column2=$value2:

my $query = $dbh->prepare("SELECT * FROM table WHERE column1 = ? AND column2 = ?;");

$query->execute($value1, $value2);

  1. Fletch your data

my @row = $query->fetchrow_array(); store data as array


my $ref = $sth->fetchrow_hashref(); store data as hash reference

  1. Finish and disconnect DB



# Parameters

Column Column
$driver Driver for DB, "Pg" for Postgresql and "mysql" for MySQL
$database your database name
$userid your database id
$password your database password
$query put your query here, ex: "select * from $your_table"