Function db_get_version

db/exec.c:15–39

* db_get_version - Determine the current DB schema version * * Will attempt to determine the current schema version of the * database @db by querying the `version` table. If the table does not * exist it'll return schema version -1, so that migration 0 is * applied, which should create the `version` table. */

 * applied, which should create the `version` table.
 */
int db_get_version(struct db *db)
{
	int res = -1;
	struct db_stmt *stmt = db_prepare_v2(db, SQL("SELECT version FROM version LIMIT 1"));

	/*
	 * Tentatively execute a query, but allow failures. Some databases
	 * like postgres will terminate the DB transaction if there is an
	 * error during the execution of a query, e.g., trying to access a
	 * table that doesn't exist yet, so we need to terminate and restart
	 * the DB transaction.
	 */
	if (!db_query_prepared_canfail(stmt)) {
		db_commit_transaction(stmt->db);
		db_begin_transaction(stmt->db);
		tal_free(stmt);
		return res;
	}

	if (db_step(stmt))
		res = db_col_int(stmt, "version");

	tal_free(stmt);
	return res;
}

u32 db_data_version_get(struct db *db)
{