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EWB Database Paths

The Energy Workbench Server(EWB) uses a defined directory structure and naming convention for locating the various databases it is requested to load data from within its "data path". EwbDataFilePaths is a class for working with the file locations used by EWB.

The basic structure for date based database files is <base_dir>/<model_date>/<model_date>-<database_type>.sqlite:

/sample/ewb/ewb_data/4444-05-06/4444-05-06-customer.sqlite

The basic structure for static database files is <base_dir>/<database_type>.sqlite:

/sample/ewb/ewb_data/load-aggregator-mbd.sqlite

Initializing EwbDataFilePaths​

An instance of EwbDataFilePaths represents a single EWB "data path". This data path is provided to the constructor via base_dir. If the directory provided via base_dir does not exist, EwbDataFilePaths can create it if create_path is set to True (Default: False).

from zepben.evolve import EwbDataFilePaths
from pathlib import Path

data_path = Path("/path/to/ewb_data/")
database_location = EwbDataFilePaths(data_path, create_path=False)

data_path = Path("/path/to/second_set/")
database_location = EwbDataFilePaths(data_path, create_path=True)

Retrieving Database File Paths​

EwbDataFilePaths provides methods to generate file paths for each type of database used by EWB. Date based databases require a Date to be provided. Note: EwbDataFilePaths will return the expected path for the provided database_type and date regardless of whether it exists or not.

from zepben.evolve import EwbDataFilePaths
from pathlib import Path
from datetime import date

data_path = Path("/path/to/ewb_data/")
ewb_data = EwbDataFilePaths(data_path)

new_date = Date(2024, 8, 3)
expected_path_to_network_database = ewb_data.network_model(new_date)
expected_path_to_diagram_database = ewb_data.diagram(new_date)

expected_path_to_weather_reading_db = ewb_data.weather_reading()

second_date = Date(2024, 11, 12)
second_network_database_path = ewb_data.network_model(second_date)

Searching for Databases​

EwbDataFilePaths contains search functionality to locate existing databases on disk.

from zepben.evolve import EwbDataFilePaths
from pathlib import Path
from datetime import date

data_path = Path("/path/to/ewb_data/")
ewb_data = EwbDataFilePaths(data_path)

# List all the dates for which exist network databases in the data path
list_of_available_dates = ewb_data.get_network_model_databases()

# Find the first date for which exists a customer database before 2011-09-10
closest_date_before = ewb_data.find_closest(Database.CUSTOMER, target_date=Date(2011, 9, 10))