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from datetime import datetime
import json
import sqlite3
# Get keys from config file
with open('/var/www/opendc.ewi.tudelft.nl/web-server/config/keys.json') as file:
KEYS = json.load(file)
DATETIME_STRING_FORMAT = '%Y-%m-%dT%H:%M:%S'
def execute(statement, t):
"""Open a database connection and execute the statement."""
# Connect to the database
connection = sqlite3.connect(KEYS['DATABASE_LOCATION'])
cursor = connection.cursor()
# Turn on foreign key checks
cursor.execute('pragma foreign_keys=ON')
# Execute the statement
cursor.execute(statement, t)
# Get the id
database_id = cursor.execute('SELECT last_insert_rowid()').fetchone()[0]
# Disconnect from the database
connection.commit()
connection.close()
# Return the id
return database_id
def fetchone(statement, t=None):
"""Open a database connection and return the first row matched by the SELECT statement."""
# Connect to the database
connection = sqlite3.connect(KEYS['DATABASE_LOCATION'])
cursor = connection.cursor()
# Execute the SELECT statement
if t is not None:
cursor.execute(statement, t)
else:
cursor.execute(statement)
value = cursor.fetchone()
# Disconnect from the database and return
connection.close()
return value
def fetchall(statement, t=None):
"""Open a database connection and return all rows matched by the SELECT statement."""
# Connect to the database
connection = sqlite3.connect(KEYS['DATABASE_LOCATION'])
cursor = connection.cursor()
# Execute the SELECT statement
if t is not None:
cursor.execute(statement, t)
else:
cursor.execute(statement)
values = cursor.fetchall()
# Disconnect from the database and return
connection.close()
return values
def datetime_to_string(datetime_to_convert):
"""Return a database-compatible string representation of the given datetime object."""
return datetime_to_convert.strftime(DATETIME_STRING_FORMAT)
def string_to_datetime(string_to_convert):
"""Return a datetime corresponding to the given string representation."""
return datetime.strptime(string_to_convert, DATETIME_STRING_FORMAT)
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