defer db connection close

en/05.2.md

@@ -39,6 +39,7 @@ The following example shows how to operate on a database based on the `database/
 	
 	func main() {
 	    db, err := sql.Open("mysql", "astaxie:astaxie@/test?charset=utf8")
+	    defer db.Close()
 	    checkErr(err)
 	
 	    // insert
@@ -93,7 +94,6 @@ The following example shows how to operate on a database based on the `database/
 	
 	    fmt.Println(affect)
 	
-	    db.Close()
 	
 	}