Golang은 필요한 경우 어떻게 데이터베이스 레코드를 효율적으로 확인하고 삽입할 수 있습니까?

func main() {
    router := gin.New()
    router.Use(gin.Logger())
    router.Use(gin.Recovery())

    db, err := sql.Open("mysql", "root:password@tcp(gpstest.cksiqniek8yk.ap-south-1.rds.amazonaws.com:3306)/tech")
    if err != nil {
        fmt.Print(err.Error())
    }
    err = db.Ping()
    if err != nil {
        fmt.Print(err.Error())
    }

    rows, err := db.Query("select sum(usercount) as usercount from ( select count(*) as usercount from category where name = 'construction' union all  select count(*) as usercount from sub_category where name = 'construction'  union all  select count(*) as usercount from industry where name = 'construction' ) as usercounts;")

    // Check if record exists
    row := db.QueryRow("SELECT EXISTS(SELECT 1 FROM ...)")
    var exists bool
    if err := row.Scan(&exists); err != nil {
        return err
    }

    // Insert record if it doesn't exist
    if !exists {
        if err := db.Exec("INSERT ..."); err != nil {
            return err
        }
    }
}