Golang record ids are 0 - postgresql

Question

I have the following Car model and a cars slice:
type Car struct {
ID int `json:"id"`
Name string `json:"title"`
}
var cars []Car
On a Postgres database, I have created a cars table to save car records.
create table cars (id serial, name varchar);
And saved, a couple of car records:
insert into cars (name) values ('Toyota');
insert into cars (name) values ('Lexus');
The records are created successfully with incremental integer ids 1 and 2.
In my Go server, I am making the following query to get the car records:
db.Query("SELECT * from cars").Rows(&cars)
for _, car := range cars {
fmt.Println(car)
}
Although there is a response, the id for each record comes as 0. I have tried to find out why, but I was not able to. Anyone has any idea?

Answer 1

database/sql package does not provide to scan the data directly to a struct, you should iterate over the rows returned from the database query and then scan the data into struct as:
var cars []cars
for rows.Next() {
var car cars
err = rows.Scan(&c.ID, &c.Name)
if err != nil {
log.Fatalf("Scan: %v", err)
}
cars = append(cars, car)
}
fmt.Println(cars)
Or you can use extension for sql package name sqlx which will provide you to directly scan the result into the slice of struct as:
cars := []cars{}
db.Select(&cars, "SELECT * from cars")