Referring to an open database connection inside a function - Golang

Question

My main function opens a database connection:

func main() {
    db, err := sql.Open(\"sqlite3\", \"./house.db\")
    checkErr(err)

    ...
}

Answer 1

Depending on how your application works, you can either

1. keep the db global
2. pass db as a parameter
3. make addRoom a method

What I typically do for API services is create a global db, like this:

var db *sql.DB

func main() {
    var err error
    db, err = sql.Open("sqlite3", "./house.db")
    checkErr(err)
    // create room Room{}
    err = addRoom(room)
    checkErr(err)
}

But you can also pass db as a parameter:

func addRow(db *sql.DB, row Room) error

Or you can create a struct which keeps the connection as an attribute and makes addRow a method:

type dbConn struct {
    db *sql.DB
}

func (conn dbConn) addRow(row Room) error

This book has some nice examples.