geovisualisierung/projects/project-3/backend/api_database.py

import sqlite3

UPSTREAM_BASE_URL = "https://api.tfl.gov.uk"
DB_NAME = "bike-data.db"


def get_db_connection():
    conn = sqlite3.connect(DB_NAME, timeout=300)
    conn.row_factory = sqlite3.Row
    return conn


# ACCIDENTS
def get_all_accidents():
    query = """SELECT id, lat, lon, location, date, severity FROM accidents"""
    return get_db_connection().execute(query).fetchall()


def get_accidents(year: str):
    query = """
    SELECT id, lat, lon, location, date, severity 
    FROM accidents WHERE STRFTIME('%Y', date) = ?"""
    return get_db_connection().execute(query, (year,)).fetchall()


# DASHBOARD
def get_dashboard(station_id):
    query = """
    SELECT
        b.id_num as id,
        b.common_name AS commonName,
        b.lat,
        b.lon,
        d.max_end_date AS maxEndDate,
        d.max_start_date AS maxStartDate
    FROM usage_stats u
    JOIN bike_points b ON u.start_station_id = b.id_num
    JOIN dashboard d ON u.start_station_id = d.id
    WHERE u.start_station_id = ?"""
    return get_db_connection().execute(query, (station_id,)).fetchone()


def get_dashboard_to(station_id, start_date, end_date):
    query = """
    SELECT
        topPoints.*, 
        b.lat AS stationLat,
        b.lon AS stationLon
    FROM (
        SELECT
            u.end_station_name AS stationName,
            u.end_station_id AS stationId,
            count(*) AS number,
            round(avg(u.duration)) AS avgDuration
        FROM usage_stats u
        WHERE u.start_station_id = ? AND date(u.start_date, 'unixepoch') BETWEEN ? AND ?
        GROUP BY u.end_station_name
        ORDER BY number DESC
        LIMIT 3
    ) as topPoints
    JOIN bike_points b ON b.id_num = topPoints.stationId"""
    return get_db_connection().execute(query, (station_id, start_date, end_date)).fetchall()


def get_dashboard_from(station_id, start_date, end_date):
    query = """
    SELECT
        topPoints.*, 
        b.lat AS stationLat,
        b.lon AS stationLon
    FROM (
        SELECT
            u.start_station_name AS stationName,
            u.start_station_id AS stationId,
            count(*) AS number,
            round(avg(u.duration)) AS avgDuration
        FROM usage_stats u
        WHERE u.end_station_id = ? AND date(u.start_date, 'unixepoch') BETWEEN ? AND ?
        GROUP BY u.start_station_name
        ORDER BY number DESC
        LIMIT 3
    ) as topPoints
    JOIN bike_points b ON b.id_num = topPoints.stationId"""
    return get_db_connection().execute(query, (station_id, start_date, end_date)).fetchall()


def get_dashboard_duration(station_id, start_date, end_date):
    query = """
        SELECT
        count(*) AS number,
        CASE 	WHEN duration <= 300 THEN '0-5'
                WHEN duration <= 900 THEN '5-15'
                WHEN duration <= 1800 THEN '15-30'
                WHEN duration <= 2700 THEN '30-45'
        ELSE '45+'
        END AS minutesGroup
    FROM usage_stats
    WHERE
        start_station_id = ? AND
        date(start_date, 'unixepoch') BETWEEN ? AND ?
    GROUP BY minutesGroup"""
    return get_db_connection().execute(query, (station_id, start_date, end_date)).fetchall()


def get_dashboard_time(station_id, start_date, end_date):
    query = """
    SELECT
        substr(strftime('%H:%M', start_date, 'unixepoch'), 1, 4) || '0' as timeFrame,
        count(*) AS number,
        round(avg(duration)) AS avgDuration
    FROM usage_stats
    WHERE
        start_station_id = ?
        AND date(start_date, 'unixepoch') BETWEEN ? AND ?
    GROUP BY substr(strftime('%H:%M', start_date, 'unixepoch'), 1, 4)"""
    return get_db_connection().execute(query, (station_id, start_date, end_date)).fetchall()