I'm receiving the following error when querying a row in an sqlite3 database:
sql: Scan error on column index 3: converting string "" to a int64: strconv.ParseInt: parsing "": invalid syntax
The query itself works, as it is able to return the queried data. I should note that each row in the database contains several columns with NULL data (only the Id and Email columns are populated). I am struggling to understand why the err occurs and how to resolve it.
The SQL table has the following nine columns:
`0,Id,INTEGER,0,,1
1,Email,TEXT,0,,0
2,Name,TEXT,0,,0
3,Rsvp,INTEGER,0,,0
4,Guests,INTEGER,0,,0
5,Meal0,INTEGER,0,,0
6,Meal1,INTEGER,0,,0
7,Comments,TEXT,0,,0
8,ModifiedAt,TEXT,0,,0`
which are defined in server.go with the following struct (I added the sql.NullString to handle the empty columns):
type User struct {
Id int
Email string
Name sql.NullString
Rsvp sql.NullInt64
Guests sql.NullInt64
Meal0 sql.NullInt64
Meal1 sql.NullInt64
Comments sql.NullString
ModifiedAt sql.NullString
}
the query is from the following handler:
func Rsvp1Handler(w http.ResponseWriter, r *http.Request) {
email := r.URL.Path[len("/rsvp/"):]
var user User
err := userStatement.QueryRow(email).Scan(&user.Id, &user.Email, &user.Name, &user.Rsvp, &user.Guests, &user.Meal0, &user.Meal1, &user.Comments, &user.ModifiedAt)
switch {
case err == sql.ErrNoRows:
log.Println("No user with that ID.")
w.Header().Set("Content-Type", "text/plain")
fmt.Fprintf(w, "Email address not found: %s", email)
case err != nil:
log.Println(err)
fmt.Fprintf(w, "Database error:
", err)
default:
log.Println("Query success. Email address: ", email)
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(&user)
}
which relies on the following constant and var:
const userSelect = "SELECT * FROM rsvp WHERE email = ?"
var userStatement *sql.Stmt
Any help or insight into the error is greatly appreciated!
