SQL


The sql sensor platform enables you to use values from an SQL database supported by the sqlalchemy library, to populate a sensor state (and attributes). This can be used to present statistics about Home Assistant sensors if used with the recorder integration database. It can also be used with an external data source.

Configuration

Adding SQL to your Home Assistant instance can be done via the user interface, by using this My button:

Information

See supported engines for which you can connect with this integration.

The SQL integration will connect to the default SQLite if “Database URL” has not been specified. If you use a different database recorder (eg MariaDB or others), you will have to specify the “Database URL” manually during integration setup.

There is no explicit configuration required for attributes. The integration will set all additional columns returned by the query as attributes.

Note that in all cases only the first row returned will be used.

Examples

In this section, you find some real-life examples of how to use this sensor.

Current state of an entity

This example shows the previously recorded state of the sensor sensor.temperature_in.

sensor:
  - platform: random
    name: Temperature in
    unit_of_measurement: "°C"

The query will look like this:

SELECT * FROM states WHERE entity_id = 'sensor.temperature_in' ORDER BY state_id DESC LIMIT 1;

Use state as column for value.

Previous state of an entity

Based on previous example with temperature, the query to get the former state is :

SELECT * FROM (SELECT * FROM states WHERE entity_id = 'sensor.temperature_in' ORDER BY state_id DESC LIMIT 2) two_entity ORDER BY state_id ASC LIMIT 1;

Use state as column for value.

Database size

Postgres

SELECT (pg_database_size('dsmrreader')/1024/1024) as db_size;

Use db_size as column for value.

MariaDB/MySQL

Change table_schema="homeassistant" to the name that you use as the database name, to ensure that your sensor will work properly.

SELECT table_schema "database", Round(Sum(data_length + index_length) / 1024, 1) "value" FROM information_schema.tables WHERE table_schema="homeassistant" GROUP BY table_schema;

Use value as column for value.

SQLite

If you are using the recorder integration then you don’t need to specify the location of the database. For all other cases, add sqlite:////path/to/database.db as Database URL.

SELECT ROUND(page_count * page_size / 1024 / 1024, 1) as size FROM pragma_page_count(), pragma_page_size();

Use size as column for value.

MS SQL

Use the same Database URL as for the recorder integration. Change DB_NAME to the name that you use as the database name, to ensure that your sensor will work properly. Be sure username has enough rights to access the sys tables.

Example Database URL: "mssql+pyodbc://username:[email protected]_IP:1433/DB_NAME?charset=utf8&driver=FreeTDS"

SELECT TOP 1 SUM(m.size) * 8 / 1024 as size FROM sys.master_files m INNER JOIN sys.databases d ON d.database_id=m.database_id WHERE d.name='DB_NAME';

Use size as column for value.