Here is an ActionHandler I created for populating a drop list from a database table. I have others that are more complex.

The user needs to pass the table being call by the following

my @CLIENT_DATASOURCE_FIELD_NAMES = qw(
        category
        record_id
        fname
        lname
        phone
        email
        comments
        address1
        address2
        city
        prov
        zip
        country
        fax
        mobile
        url
	company_code
        company_name
        title
        department
        username_of_poster
        group_of_poster
        date_time_posted
);

my	@CLIENT_DATASOURCE_CONFIG_PARAMS = (
	        -TYPE         => 'DBI',
	        -DBI_DSN      => 'mysql:host=localhost;database=NameOfDatabase',
	        -TABLE        => 'client_tb',
	        -USERNAME     => 'Database User name',
	        -PASSWORD     => 'Password',
	        -FIELD_NAMES  => \@CLIENT_DATASOURCE_FIELD_NAMES,
	        -KEY_FIELDS   => ['username'],
	        -FIELD_TYPES  => {
	            record_id        => 'Autoincrement'
	        },
	);


my @DATASOURCE_CONFIG_PARAMS = (
    -BASIC_DATASOURCE_CONFIG_PARAMS     => \@BASIC_DATASOURCE_CONFIG_PARAMS,
    -CLIENT_DATASOURCE_CONFIG_PARAMS    => \@CLIENT_DATASOURCE_CONFIG_PARAMS,
    -AUTH_USER_DATASOURCE_CONFIG_PARAMS => \@AUTH_USER_DATASOURCE_PARAMS
);

You will have to add the name of the ActionHandler to the ActionHandler list.

my @ACTION_HANDLER_LIST = 
    qw(
       CSC::PopulateInputWidgetDefinitionListWithClientWidgetAction