func (a *run_tagger_action) setupConnPool() {
	a.connPool = make([]*db.Mysql, *a.workers)
	for i := 0; i < *a.workers; i++ {
		conn := new(db.Mysql)
		a.connPool[i] = conn.New(*a.dbUser, *a.dbPass, *a.dbName)
	}
}