Add example for AAD Service Principal connection

examples/azuread-service-principal/service_principal.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+	"database/sql"
+	"flag"
+	"fmt"
+	"log"
+
+	_ "github.com/denisenkom/go-mssqldb"
+	"github.com/denisenkom/go-mssqldb/azuread"
+)
+
+var (
+	debug         = flag.Bool("debug", true, "enable debugging")
+	password      = flag.String("password", "", "the client secret for the app/client ID")
+	port     *int = flag.Int("port", 1433, "the database port")
+	server        = flag.String("server", "", "the database server")
+	user          = flag.String("user", "", "the app/client ID of the service principal")
+	database      = flag.String("database", "", "the database name")
+)
+
+func main() {
+	flag.Parse()
+
+	if *debug {
+		fmt.Printf(" password:%s\n", *password)
+		fmt.Printf(" port:%d\n", *port)
+		fmt.Printf(" server:%s\n", *server)
+		fmt.Printf(" user:%s\n", *user)
+		fmt.Printf(" database:%s\n", *database)
+	}
+
+	connString := fmt.Sprintf("server=%s;user id=%s;password=%s;port=%d;database=%s;fedauth=ActiveDirectoryServicePrincipal;", *server, *user, *password, *port, *database)
+	if *debug {
+		fmt.Printf(" connString:%s\n", connString)
+	}
+	conn, err := sql.Open(azuread.DriverName, connString)
+	if err != nil {
+		log.Fatal("Open connection failed:", err.Error())
+	}
+	defer conn.Close()
+
+	stmt, err := conn.Prepare("select 1, 'abc'")
+	if err != nil {
+		log.Fatal("Prepare failed:", err.Error())
+	}
+	defer stmt.Close()
+
+	row := stmt.QueryRow()
+	var somenumber int64
+	var somechars string
+	err = row.Scan(&somenumber, &somechars)
+	if err != nil {
+		log.Fatal("Scan failed:", err.Error())
+	}
+	fmt.Printf("somenumber:%d\n", somenumber)
+	fmt.Printf("somechars:%s\n", somechars)
+
+	fmt.Printf("bye\n")
+}