package main

import (
    "fmt"
    "log"
    "database/sql"
    _ "github.com/lib/pq"
)

func main() {
    db, err := sql.Open(
        "postgres",
        "user=test password=test dbname=test sslmode=disable")
    if err != nil {
        log.Fatalf("error: %vn", err)
    }

    stmt, err := db.Prepare("INSERT INTO test(value) VALUES($1) RETURNING id")
    if err != nil {
        log.Fatalf("error: %vn", err)
    }

    var id int
    err = stmt.QueryRow("value to insert").Scan(&id)
    if err != nil {
        log.Fatalf("error: %vn", err)
    }

    fmt.Printf("inserted object's ID: %dn", id)
}

stmt, _ := connection.Prepare("INSERT ....")
res, _ := stmt.Exec()
id, err := res.LastInsertId()