i'm beginner in golang , i'm working on small library need db connection @ point in code différent sub package / method call. i'm wondering how can manage ?
example, if manage have webserver, works handler, how can connection inside function ? used process, simple method call or mvc model ?
i don't want use global because me it's bad practice except if it's exceptional way (or tricky somehow).
i read lot of write in different website, still, i'm asking , learning different opinion , experiences.
thanks time !
create struct represent resource, let's call cart. add , post methods struct. these methods should http handlers. in main create instance of struct db interface. , in route call cart.get. in method have access db interface.
not working example, idea of injecting testing.
type storage interface { preparecontext(context.context, string) (*sql.stmt, error) } func main() { db, _ := sql.open("mysql", `querystring`) http.handlefunc("/", cart{db}.get) http.listenandserve(":8080", nil) } type cart struct { storage } func (crt cart) get(w http.responsewriter, r *http.request) { q, _ := crt.preparecontext(context.background(), `select *`) fmt.println(q.exec()) } /////////test type testdb struct{} func (c testdb) preparecontext(context.context, string) (*sql.stmt, error) { return nil, nil } func testget(t *testing.t) { db := testdb{} _ = cart{db} //http test here } 
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