new exporter version

testing/go-code-samples/database-sql-package-goproject/single/single.go

@@ -0,0 +1,65 @@
+package main
+
+import (
+	"database/sql"
+	"fmt"
+	"log"
+	"os"
+
+	"github.com/go-sql-driver/mysql"
+)
+
+var db *sql.DB
+
+type Album struct {
+	ID       int64
+	Title    string
+	Artist   string
+	Price    float32
+	Quantity int64
+}
+
+func main() {
+	// Capture connection properties.
+	cfg := mysql.Config{
+		User:   os.Getenv("DBUSER"),
+		Passwd: os.Getenv("DBPASS"),
+		Net:    "tcp",
+		Addr:   "127.0.0.1:3306",
+		DBName: "recordings",
+	}
+	// Get a database handle.
+	var err error
+	db, err = sql.Open("mysql", cfg.FormatDSN())
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	pingErr := db.Ping()
+	if pingErr != nil {
+		log.Fatal(pingErr)
+	}
+	fmt.Println("Connected!")
+
+	// Hard-code ID 2 here to test the query.
+	alb, err := albumByID(2)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Printf("Album found: %v\n", alb)
+}
+
+// albumByID queries for the album with the specified ID.
+func albumByID(id int64) (Album, error) {
+	// An album to hold data from the returned row.
+	var alb Album
+
+	row := db.QueryRow("SELECT * FROM album WHERE id = ?", id)
+	if err := row.Scan(&alb.ID, &alb.Title, &alb.Artist, &alb.Price, &alb.Quantity); err != nil {
+		if err == sql.ErrNoRows {
+			return alb, fmt.Errorf("albumsById %d: no such album", id)
+		}
+		return alb, fmt.Errorf("albumsById %d: %v", id, err)
+	}
+	return alb, nil
+}