fix: add measured values table - postgres
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852BCC170D81A982
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-- Remove constraints to table measured_values
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ALTER TABLE humidities
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DROP CONSTRAINT fk_humidites_measured_value_id;
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ALTER TABLE pressures
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DROP CONSTRAINT fk_pressures_measured_value_id;
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ALTER TABLE temperatures
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DROP CONSTRAINT fk_temperatures_measured_value_id;
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-- Rename measured_value_id to sensor_id
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ALTER TABLE humidities
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RENAME COLUMN measured_value_id TO sensor_id;
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ALTER TABLE pressures
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RENAME COLUMN measured_value_id TO sensor_id;
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ALTER TABLE temperatures
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RENAME COLUMN measured_value_id TO sensor_id;
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-- Add new column measures_value_id with data from sensor_id
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ALTER TABLE humidities
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ADD COLUMN measured_value_id CHAR(36);
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UPDATE humidities
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SET measured_value_id=sensor_id;
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ALTER TABLE pressures
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ADD COLUMN measured_value_id CHAR(36);
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UPDATE pressures
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SET measured_value_id=sensor_id;
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ALTER TABLE temperatures
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ADD COLUMN measured_value_id CHAR(36);
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UPDATE temperatures
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SET measured_value_id=sensor_id;
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-- Update sensor_id's
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UPDATE humidities h
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SET sensor_id = (
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SELECT m.sensor_id
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FROM measured_values m
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WHERE m.id = h.measured_value_id
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);
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UPDATE pressures p
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SET sensor_id = (
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SELECT m.sensor_id
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FROM measured_values m
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WHERE m.id = p.measured_value_id
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);
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UPDATE temperatures t
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SET sensor_id = (
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SELECT m.sensor_id
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FROM measured_values m
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WHERE m.id = t.measured_value_id
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);
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-- Delete sensor_id columns
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ALTER TABLE humidities
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DROP COLUMN measured_value_id;
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ALTER TABLE pressures
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DROP COLUMN measured_value_id;
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ALTER TABLE temperatures
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DROP COLUMN measured_value_id;
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-- Add foreign keys
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ALTER TABLE humidities
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ADD CONSTRAINT fk_humidites_sensor_id
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FOREIGN KEY (sensor_id)
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REFERENCES sensors(sensor_id)
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ON DELETE CASCADE
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ON UPDATE CASCADE;
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ALTER TABLE pressures
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ADD CONSTRAINT fk_pressures_sensor_id
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FOREIGN KEY (sensor_id)
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REFERENCES sensors(sensor_id)
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ON DELETE CASCADE
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ON UPDATE CASCADE;
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ALTER TABLE temperatures
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ADD CONSTRAINT fk_temperatures_sensor_id
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FOREIGN KEY (sensor_id)
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REFERENCES sensors(sensor_id)
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ON DELETE CASCADE
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ON UPDATE CASCADE;
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-- drop measured values table
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DROP TABLE measured_values CASCADE;
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@ -0,0 +1,130 @@
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-- Create measures_values table.
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-- This table represent a collection of different measured values, because it
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-- can be possible, that a sensor returns multiple measured values. For example
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-- the BME280 semsor returns humidity, pressure and temperature values.
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CREATE TABLE measured_values (
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id CHAR(36) NOT NULL,
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sensor_id CHAR(36) NOT NULL,
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creation_date TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP NOT NULL,
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update_date TIMESTAMP WITH TIME ZONE,
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CONSTRAINT pk_measured_value PRIMARY KEY(id),
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CONSTRAINT pk_measured_value_sensor_id FOREIGN KEY(sensor_id) REFERENCES sensors(sensor_id) ON DELETE CASCADE ON UPDATE CASCADE
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);
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-- Remove constraints to table sensor
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ALTER TABLE humidities
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DROP CONSTRAINT fk_humidites_sensor_id;
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ALTER TABLE pressures
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DROP CONSTRAINT fk_pressures_sensor_id;
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ALTER TABLE temperatures
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DROP CONSTRAINT fk_temperatures_sensor_id;
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-- Rename sensor_id to measured_value_id
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ALTER TABLE humidities
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RENAME COLUMN sensor_id TO measured_value_id;
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ALTER TABLE pressures
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RENAME COLUMN sensor_id TO measured_value_id;
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ALTER TABLE temperatures
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RENAME COLUMN sensor_id TO measured_value_id;
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-- Add new column sensor_id with data from measures_value_id
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ALTER TABLE humidities
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ADD COLUMN sensor_id CHAR(36);
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UPDATE humidities
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SET sensor_id=measured_value_id;
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ALTER TABLE pressures
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ADD COLUMN sensor_id CHAR(36);
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UPDATE pressures
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SET sensor_id=measured_value_id;
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ALTER TABLE temperatures
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ADD COLUMN sensor_id CHAR(36);
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UPDATE temperatures
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SET sensor_id=measured_value_id;
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DO $$
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DECLARE
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f record;
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BEGIN
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FOR f IN (
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SELECT
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md5(random()::text || clock_timestamp()::text)::uuid AS measured_value_id,
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h.id AS humidity_id,
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p.id AS pressure_id,
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t.id AS temperature_id,
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CASE WHEN h.sensor_id IS NOT NULL THEN h.sensor_id
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WHEN p.sensor_id IS NOT NULL THEN p.sensor_id
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WHEN t.sensor_id IS NOT NULL THEN t.sensor_id
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ELSE NULL
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END sensor_id
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FROM pressures p
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FULL OUTER JOIN temperatures t ON (t.date = p.date AND t.sensor_id = p.sensor_id)
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FULL OUTER JOIN humidities h ON (h.date = p.date AND h.sensor_id = p.sensor_id)
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) LOOP
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-- MEASURED_VALUE
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INSERT INTO measured_values(id, sensor_id, creation_date, update_date)
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VALUES (f.measured_value_id, f.sensor_id, NOW(), NULL)
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ON CONFLICT (
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id
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)
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DO NOTHING;
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-- HUMIDITY
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UPDATE humidities
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SET measured_value_id=f.measured_value_id
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WHERE id=f.humidity_id;
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-- PRESSURE
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UPDATE pressures
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SET measured_value_id=f.measured_value_id
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WHERE id=f.pressure_id;
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-- TEMPERATURES
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UPDATE temperatures
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SET measured_value_id=f.measured_value_id
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WHERE id=f.temperature_id;
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END LOOP;
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END;
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$$;
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-- Delete sensor_id columns
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ALTER TABLE humidities
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DROP COLUMN sensor_id;
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ALTER TABLE pressures
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DROP COLUMN sensor_id;
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ALTER TABLE temperatures
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DROP COLUMN sensor_id;
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-- Add foreign keys
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ALTER TABLE humidities
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ADD CONSTRAINT fk_humidites_measured_value_id
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FOREIGN KEY (measured_value_id)
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REFERENCES measured_values(id)
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ON DELETE CASCADE
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ON UPDATE CASCADE;
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ALTER TABLE pressures
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ADD CONSTRAINT fk_pressures_measured_value_id
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FOREIGN KEY (measured_value_id)
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REFERENCES measured_values(id)
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ON DELETE CASCADE
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ON UPDATE CASCADE;
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ALTER TABLE temperatures
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ADD CONSTRAINT fk_temperatures_measured_value_id
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FOREIGN KEY (measured_value_id)
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REFERENCES measured_values(id)
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ON DELETE CASCADE
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ON UPDATE CASCADE;
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