|
.. _sql engines:
|
|
|
|
===========
|
|
SQL Engines
|
|
===========
|
|
|
|
.. sidebar:: further read
|
|
|
|
- `SQLite <https://www.sqlite.org/index.html>`_
|
|
- `PostgreSQL <https://www.postgresql.org>`_
|
|
- `MySQL <https://www.mysql.com>`_
|
|
|
|
With the *SQL engines* you can bind SQL databases into SearXNG. The following
|
|
Relational Database Management System (RDBMS) are supported:
|
|
|
|
- :ref:`engine sqlite`
|
|
- :ref:`engine postgresql`
|
|
- :ref:`engine mysql_server`
|
|
|
|
All of the engines above are just commented out in the :origin:`settings.yml
|
|
<searx/settings.yml>`, as you have to set the required attributes for the
|
|
engines, e.g. ``database:`` ...
|
|
|
|
.. code:: yaml
|
|
|
|
- name: ...
|
|
engine: {sqlite|postgresql|mysql_server}
|
|
database: ...
|
|
result_template: {template_name}
|
|
query_str: ...
|
|
|
|
By default, the engines use the ``key-value`` template for displaying results /
|
|
see :origin:`simple <searx/templates/simple/result_templates/key-value.html>`
|
|
theme. If you are not satisfied with the original result layout, you can use
|
|
your own template, set ``result_template`` attribute to ``{template_name}`` and
|
|
place the templates at::
|
|
|
|
searx/templates/{theme_name}/result_templates/{template_name}
|
|
|
|
If you do not wish to expose these engines on a public instance, you can still
|
|
add them and limit the access by setting ``tokens`` as described in section
|
|
:ref:`private engines`.
|
|
|
|
|
|
Configure the engines
|
|
=====================
|
|
|
|
The configuration of the new database engines are similar. You must put a valid
|
|
SQL-SELECT query in ``query_str``. At the moment you can only bind at most one
|
|
parameter in your query. By setting the attribute ``limit`` you can define how
|
|
many results you want from the SQL server. Basically, it is the same as the
|
|
``LIMIT`` keyword in SQL.
|
|
|
|
Please, do not include ``LIMIT`` or ``OFFSET`` in your SQL query as the engines
|
|
rely on these keywords during paging. If you want to configure the number of
|
|
returned results use the option ``limit``.
|
|
|
|
.. _engine sqlite:
|
|
|
|
SQLite
|
|
------
|
|
|
|
.. sidebar:: info
|
|
|
|
- :origin:`sqlite.py <searx/engines/sqlite.py>`
|
|
|
|
.. _MediathekView: https://mediathekview.de/
|
|
|
|
SQLite is a small, fast and reliable SQL database engine. It does not require
|
|
any extra dependency. 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
|
|
|
|
|
|
Extra Dependencies
|
|
------------------
|
|
|
|
For using :ref:`engine postgresql` or :ref:`engine mysql_server` you need to
|
|
install additional packages in Python's Virtual Environment of your SearXNG
|
|
instance. To switch into the environment (:ref:`searxng-src`) you can use
|
|
:ref:`searxng.sh`::
|
|
|
|
$ sudo utils/searxng.sh instance cmd bash
|
|
(searxng-pyenv)$ pip install ...
|
|
|
|
|
|
.. _engine postgresql:
|
|
|
|
PostgreSQL
|
|
----------
|
|
|
|
.. _psycopg2: https://www.psycopg.org/install
|
|
|
|
.. sidebar:: info
|
|
|
|
- :origin:`postgresql.py <searx/engines/postgresql.py>`
|
|
- ``pip install`` psycopg2_
|
|
|
|
PostgreSQL is a powerful and robust open source database. Before configuring
|
|
the PostgreSQL engine, you must install the dependency ``psychopg2``. You can
|
|
find an example configuration below:
|
|
|
|
.. code:: yaml
|
|
|
|
- name: my_database
|
|
engine: postgresql
|
|
database: my_database
|
|
username: searxng
|
|
password: password
|
|
query_str: 'SELECT * from my_table WHERE my_column = %(query)s'
|
|
|
|
.. _engine mysql_server:
|
|
|
|
MySQL
|
|
-----
|
|
|
|
.. sidebar:: info
|
|
|
|
- :origin:`mysql_server.py <searx/engines/mysql_server.py>`
|
|
- ``pip install`` :pypi:`mysql-connector-python <mysql-connector-python>`
|
|
|
|
MySQL is said to be the most popular open source database. Before enabling MySQL
|
|
engine, you must install the package ``mysql-connector-python``.
|
|
|
|
The authentication plugin is configurable by setting ``auth_plugin`` in the
|
|
attributes. By default it is set to ``caching_sha2_password``. This is an
|
|
example configuration for querying a MySQL server:
|
|
|
|
.. code:: yaml
|
|
|
|
- name: my_database
|
|
engine: mysql_server
|
|
database: my_database
|
|
username: searxng
|
|
password: password
|
|
limit: 5
|
|
query_str: 'SELECT * from my_table WHERE my_column=%(query)s'
|
|
|
|
|
|
Acknowledgment
|
|
==============
|
|
|
|
This development was sponsored by `Search and Discovery Fund
|
|
<https://nlnet.nl/discovery>`_ of `NLnet Foundation <https://nlnet.nl/>`_.
|
|
|