DefendYourKingdom

Yordan thank you for answering my question and thank you for putting me a link where I can consult what I need, however I solved it by myself, I put the code inside the answer so that if some other user should have the same problem that I had, he already has the immediate solution, thanks again Yordan good day.

code solution:

/*STORE DATA DA CF7*/
function wpcf7_send_to_external ( $cf7 ) {

    //external db details
    $username = 'USERNAME';
    $password = 'PASSWORDDB';
    $database = 'NAMEDB';
    $host = 'HOST';

    //create new wpdb instance
    $mydb = new wpdb($username, $password, $database, $host);

    //limit hook to only fire on particular form ID (optional)
    if ( $cf7->id == IDOFYOURCF7 ) {

        //get select box for different enquiry types (optional)
        //$type = $cf7->posted_data["your-select"];

        //if form type is equal to above value (optional)
        //if ( $type == 'Form Name' ){

        //code added for wordpress 4.9 2018
        //$cf7 = WPCF7_ContactForm::get_current();
        $submission = WPCF7_Submission::get_instance();
        $data = $submission->get_posted_data();

        //get posted form fields
        //these are example form fields
        $field1 = $data["NAMEOFYOURINPUTINCF7"];

        //insert into external db
        $mydb->insert(
        //name of external db table
            'NAMEOFYOURTABLE',
            //name of table columns and which fields to insert
            //these are example fields
            array(
                'NAMEOFYOURVALUEINDB' => $field1

            ),
            //field formats: %s = string, %d = integer, %f = float
            array(
                '%s'
            )
        );

        //}

    }

}
add_action("wpcf7_before_send_mail", "wpcf7_send_to_external");