check for unique card_name - fixes #17

createboltcard/database.go

@@ -46,6 +46,27 @@ func db_delete_expired() error {
 	return nil
 }
 
+func db_get_card_name_count(card_name string) (card_count int, err error) {
+
+	card_count = 0
+
+	db, err := db_open()
+	if err != nil {
+		return 0, err
+	}
+	defer db.Close()
+
+	sqlStatement := `SELECT COUNT(card_id) FROM cards WHERE card_name = $1;`
+
+	row := db.QueryRow(sqlStatement, card_name)
+	err = row.Scan(&card_count)
+	if err != nil {
+		return 0, err
+	}
+
+	return card_count, nil
+}
+
 func db_insert_card(one_time_code string, k0_auth_key string, k2_cmac_key string, k3 string, k4 string,
 	tx_max_sats int, day_max_sats int, lnurlw_enable bool, card_name string) error {