How do you use the Perl DBI module to connect to databases?

The Perl DBI (Database Independent Interface) module is a powerful tool that allows you to connect to and interact with a wide variety of databases. To use the DBI module to connect to a database, you will first need to install it and then load it into your script using the "use" statement.

To connect to a database, you will use the "connect" method of the DBI module. The "connect" method takes four arguments: the database driver, the database name, the username, and the password. For example, to connect to a MySQL database, you would use the following code:

use DBI; my $dbh = DBI->connect("DBI:mysql:database=testdb;host=localhost", "username", "password", { RaiseError => 1, AutoCommit => 1 });

Once you have connected to a database, you can use the DBI methods to interact with the database. For example, you can use the "prepare" method to prepare a SQL statement, the "execute" method to execute a SQL statement, and the "fetchrow_hashref" method to retrieve rows from a SELECT statement.

Here's an example of how to perform a SELECT statement and retrieve the results:

my $sth = $dbh->prepare("SELECT * FROM mytable"); $sth->execute(); while (my $row = $sth->fetchrow_hashref()) { print "Id: $row->{'id'} Name: $row->{'name