Dump the contents of the database

This example python code dumps the content of a database:

# Connect to the database
db = dballe.DB.connect_from_file("db.sqlite")

# Start a transaction
with db.transaction() as tr:
    for srow in tr.query_stations():
        print(f"* Station: {srow['station']}")

        print("  Station values:")
        for row in tr.query_station_data({"ana_id": srow["ana_id"]}):
            var = row["variable"]
            print(f"    {var.code} {var.info.desc}: {var.format('undefined')}")

        print("  Measured values:")
        cur_datetime = None
        cur_level = None
        cur_trange = None
        for row in tr.query_data({"ana_id": srow["ana_id"]}):
            if cur_datetime != row["datetime"]:
                print(f"    {row['datetime']}:")
                cur_datetime = row["datetime"]
            if cur_level != row["level"]:
                print(f"      At level: {row['level'].describe()}")
                cur_level = row["level"]
                cur_trange = None
            if cur_trange != row["trange"]:
                print(f"      At time range: {row['trange'].describe()}")
                cur_trange = row["trange"]
            var = row["variable"]
            print(f"        {var.code} {var.info.desc}: {var.format('undefined')}")