folktales 2018.5.3.245

creation, access and modification of SQL databases

folktales

folktales enables the creation, access and modification of SQL databases, with an emphasis on storing dictionaries easily and accessing database tables as pandas DataFrames easily. It also provides template dictionaries suitable for logging. While it can be used with other databases, it is designed currently to be used easily with SQLite3 databases.

folktales might be used in a logging context, whereby a status dictionary, which features a UUID4 identifier and a UTC datetime by default, is updated with program characteristics or other data and then saved to database.

setup

pip install folktales

Sqliteman is a GUI tool that can be used to interact with SQLite3 databases.

apt install sqliteman

examples

create a database

folktales.create_database(filepath = "database.db")

access a database

database = folktales.access_database(filepath = "database.db")

insert a dictionary into a database table

folktales.insert_dictionary_into_database_table(
    dictionary      = {
                      "a": 1,
                      "b": 2
                      },
    table_name      = "data",
    filepath        = "database.db"
)

state dictionaries

A template state dictionary can be created in the following way:

folktales.template_state_dictionary()

This returns a dictionary that features a UUID4 identifier (uuid.uuid4()) and a datetime (datetime.datetime.utcnow()).

A state dictionary can be created at the same time as updating it with an existing dictionary in the following way:

folktales.state_dictionary(
    entries = {
              "state_ID"             : "84f80687-cdd7-48f9-b21c-3d75fd759604",
              "price_recommendation" : 5007.24
              }
)

insert a state dictionary into a database table

folktales.insert_state_dictionary_into_database_table(
    entries    = {
                 "state_ID"             : "84f80687-cdd7-48f9-b21c-3d75fd759604",
                 "price_recommendation" : 5007.24
                 },
    table_name = "do_stocks",
    filepath   = "database.db"
)

access a database table as a pandas DataFrame

df = folktales.DataFrame_of_database_table(
    filepath   = "database.db",
    table_name = "do_stocks"
)