|
# SPDX-License-Identifier: AGPL-3.0-or-later
|
|
# lint: pylint
|
|
"""SQLite is a small, fast and reliable SQL database engine. It does not require
|
|
any extra dependency.
|
|
|
|
Example
|
|
=======
|
|
|
|
.. _MediathekView: https://mediathekview.de/
|
|
|
|
To demonstrate the power of database engines, here is a more complex example
|
|
which reads from a MediathekView_ (DE) movie database. For this example of the
|
|
SQLite engine download the database:
|
|
|
|
- https://liste.mediathekview.de/filmliste-v2.db.bz2
|
|
|
|
and unpack into ``searx/data/filmliste-v2.db``. To search the database use e.g
|
|
Query to test: ``!mediathekview concert``
|
|
|
|
.. code:: yaml
|
|
|
|
- name: mediathekview
|
|
engine: sqlite
|
|
disabled: False
|
|
categories: general
|
|
result_template: default.html
|
|
database: searx/data/filmliste-v2.db
|
|
query_str: >-
|
|
SELECT title || ' (' || time(duration, 'unixepoch') || ')' AS title,
|
|
COALESCE( NULLIF(url_video_hd,''), NULLIF(url_video_sd,''), url_video) AS url,
|
|
description AS content
|
|
FROM film
|
|
WHERE title LIKE :wildcard OR description LIKE :wildcard
|
|
ORDER BY duration DESC
|
|
|
|
Implementations
|
|
===============
|
|
|
|
"""
|
|
|
|
import sqlite3
|
|
import contextlib
|
|
|
|
engine_type = 'offline'
|
|
database = ""
|
|
query_str = ""
|
|
limit = 10
|
|
paging = True
|
|
result_template = 'key-value.html'
|
|
|
|
|
|
def init(engine_settings):
|
|
if 'query_str' not in engine_settings:
|
|
raise ValueError('query_str cannot be empty')
|
|
|
|
if not engine_settings['query_str'].lower().startswith('select '):
|
|
raise ValueError('only SELECT query is supported')
|
|
|
|
|
|
@contextlib.contextmanager
|
|
def sqlite_cursor():
|
|
"""Implements a :py:obj:`Context Manager <contextlib.contextmanager>` for a
|
|
:py:obj:`sqlite3.Cursor`.
|
|
|
|
Open database in read only mode: if the database doesn't exist. The default
|
|
mode creates an empty file on the file system. See:
|
|
|
|
* https://docs.python.org/3/library/sqlite3.html#sqlite3.connect
|
|
* https://www.sqlite.org/uri.html
|
|
|
|
"""
|
|
uri = 'file:' + database + '?mode=ro'
|
|
with contextlib.closing(sqlite3.connect(uri, uri=True)) as connect:
|
|
connect.row_factory = sqlite3.Row
|
|
with contextlib.closing(connect.cursor()) as cursor:
|
|
yield cursor
|
|
|
|
|
|
def search(query, params):
|
|
results = []
|
|
|
|
query_params = {
|
|
'query': query,
|
|
'wildcard': r'%' + query.replace(' ', r'%') + r'%',
|
|
'limit': limit,
|
|
'offset': (params['pageno'] - 1) * limit,
|
|
}
|
|
query_to_run = query_str + ' LIMIT :limit OFFSET :offset'
|
|
|
|
with sqlite_cursor() as cur:
|
|
|
|
cur.execute(query_to_run, query_params)
|
|
col_names = [cn[0] for cn in cur.description]
|
|
|
|
for row in cur.fetchall():
|
|
item = dict(zip(col_names, map(str, row)))
|
|
item['template'] = result_template
|
|
logger.debug("append result --> %s", item)
|
|
results.append(item)
|
|
|
|
return results
|