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118 lines
3.3 KiB
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=================
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Query SQL servers
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=================
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Now you can query SQL servers using searx. The following ones are supported:
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* `PostgreSQL`_
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* `MySQL`_
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* `SQLite`_
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All of the engines above are added to ``settings.yml`` just commented out, as you have to
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set the required attributes for the engines, e.g. ``database``. By default, the engines use
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``key-value`` template for displaying results. If you are not satisfied with the original result layout,
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you can use your owm template by placing the template under
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``searx/templates/{theme_name}/result_templates/{template_name}`` and setting
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``result_template`` attribute to ``{template_name}``.
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As mentioned in previous blog posts, if you do not wish to expose these engines on a
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public instance, you can still add them and limit the access by setting ``tokens``
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as described in the `blog post about private engines`_.
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Configure the engines
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=====================
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The configuration of the new database engines are similar. You must put a valid
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SELECT SQL query in ``query_str``. At the moment you can only bind at most
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one parameter in your query. By setting the attribute ``limit`` you can
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define how many results you want from the SQL server. Basically, it
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is the same as the LIMIT keyword in SQL.
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Please, do not include LIMIT or OFFSET in your SQL query as the engines
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rely on these keywords during paging. If you want to configure the number of returned results
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use the option ``limit``.
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PostgreSQL
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----------
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PostgreSQL is a powerful and robust open source database.
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Before configuring the PostgreSQL engine, you must install the dependency ``psychopg2``.
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You can find an example configuration below:
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.. code:: yaml
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- name : postgresql
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engine : postgresql
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database : my_database
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username : searx
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password : password
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query_str : 'SELECT * from my_table WHERE my_column = %(query)s'
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shortcut : psql
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MySQL
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-----
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MySQL is said to be the most popular open source database.
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Before enabling MySQL engine, you must install the package ``mysql-connector-python``.
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The authentication plugin is configurable by setting ``auth_plugin`` in the attributes.
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By default it is set to ``caching_sha2_password``.
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This is an example configuration for querying a MySQL server:
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.. code:: yaml
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- name : mysql
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engine : mysql_server
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database : my_database
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username : searx
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password : password
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limit : 5
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query_str : 'SELECT * from my_table WHERE my_column=%(query)s'
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shortcut : mysql
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SQLite
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------
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SQLite is a small, fast and reliable SQL database engine. It does not require
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any extra dependency.
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You can read from your database ``my_database`` using this example configuration:
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.. code:: yaml
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- name : sqlite
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engine : sqlite
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shortcut: sq
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database : my_database
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query_str : 'SELECT * FROM my_table WHERE my_column=:query'
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Next steps
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==========
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The next step is to add support for more data stores, e.g. Redis and MongoDB.
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Acknowledgement
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===============
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This development was sponsored by `Search and Discovery Fund`_ of `NLnet Foundation`_ .
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.. _PostgreSQL: https://www.postgresql.org/
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.. _MySQL: https://www.mysql.com/
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.. _SQLite: https://www.sqlite.org/index.html
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.. _blog post about private engines: private-engines.html#private-engines
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.. _Search and Discovery Fund: https://nlnet.nl/discovery
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.. _NLnet Foundation: https://nlnet.nl/
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| Happy hacking.
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| kvch // 2021.05.23 23:16
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