Database

class crotal.db.Database(path, content=None)

Database is the interface to the file 'db.json'.

Initalize a new database object.

Parameters

• path -- Indicating the path of the file that this database will be written to when saving the database.
• content -- Content of the database if needed to predefine.

Returns

None

classmethod from_file(path)

Read the database from the path argument. :param path: The file path of the designated database file. :return: The database object.

get_table(table)

Get a table object, same to self.__getitem__.

Parameters

table -- Name of the table acquired.

Returns

A table object.

get_item(table, key)

Get the value directly from the database based on key and table name.

Parameters

• table -- Name of the table acquired.
• key -- Name of the key in the indicated table.

Returns

The corresponding value stored in the table.

set_item(table, key, value)

Set the entry directly from the database based on key and table name.

Parameters

• table -- Name of the table acquired.
• key -- Name of the key in the indicated table.

Value value

Value to be set in the table.

Returns

The corresponding value stored in the table.

remove_item(table, key)

Remove the entry directly from the database based on key and table name.

Parameters

• table -- Name of the table acquired.
• key -- Name of the key in the indicated table.

Value value

Value to be set in the table.

Returns

The corresponding value stored in the table.

dumps()

Similar to json.dumps.

save()

Write the content of the database to the file indicated by self._path in json format. :return:

class crotal.db.Table(table_name, content=None)

Table is a wrapper of dictionary. The usage is the same as dict.