190 lines
8.2 KiB
MySQL
190 lines
8.2 KiB
MySQL
|
-- Create measures_values table.
|
||
|
|
-- This table represent a collection of different measured values, because it
|
||
|
|
-- can be possible, that a sensor returns multiple measured values. For example
|
||
|
|
-- the BME280 semsor returns humidity, pressure and temperature values.
|
||
|
|
CREATE TABLE measured_values (
|
||
|
|
id CHAR(36) NOT NULL,
|
||
|
|
sensor_id CHAR(36) NOT NULL,
|
||
|
|
creation_date TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP NOT NULL,
|
||
|
|
update_date TIMESTAMP WITH TIME ZONE,
|
||
|
|
CONSTRAINT pk_measured_value PRIMARY KEY(id),
|
||
|
|
CONSTRAINT pk_measured_value_sensor_id FOREIGN KEY(sensor_id) REFERENCES sensors(sensor_id) ON DELETE CASCADE ON UPDATE CASCADE
|
||
|
|
);
|
||
|
|
|
||
|
|
-- All tables with the original data rows must be renamed, because it is not
|
||
|
|
-- possible to remove existing foreign keys. The tables will be recreated with
|
||
|
|
-- a new column measured_value_id which reference on the primary key of the
|
||
|
|
-- table measured values.
|
||
|
|
--
|
||
|
|
-- More about why it is not possible to delete a foreign key is described here:
|
||
|
|
-- https://stackoverflow.com/a/1884893/7652996
|
||
|
|
ALTER TABLE humidities
|
||
|
|
RENAME TO humidities_backup;
|
||
|
|
|
||
|
|
CREATE TABLE humidities (
|
||
|
|
id CHAR(36) NOT NULL,
|
||
|
|
value NUMERIC(10,3) NOT NULL,
|
||
|
|
date TIMESTAMP NOT NULL,
|
||
|
|
measured_value_id CHAR(36) NOT NULL,
|
||
|
|
creation_date TIMESTAMP DEFAULT (datetime('now', 'localtime')) NOT NULL,
|
||
|
|
update_date TIMESTAMP,
|
||
|
|
CONSTRAINT pk_humidities PRIMARY KEY(id),
|
||
|
|
CONSTRAINT fk_humidities_measured_value_id FOREIGN KEY(measured_value_id) REFERENCES measured_values(id) ON DELETE CASCADE ON UPDATE CASCADE
|
||
|
|
);
|
||
|
|
|
||
|
|
ALTER TABLE pressures
|
||
|
|
RENAME TO pressures_backup;
|
||
|
|
|
||
|
|
CREATE TABLE pressures (
|
||
|
|
id CHAR(36) NOT NULL,
|
||
|
|
value NUMERIC(10,3) NOT NULL,
|
||
|
|
date TIMESTAMP NOT NULL,
|
||
|
|
measured_value_id CHAR(36) NOT NULL,
|
||
|
|
creation_date TIMESTAMP DEFAULT (datetime('now', 'localtime')) NOT NULL,
|
||
|
|
update_date TIMESTAMP,
|
||
|
|
CONSTRAINT pk_pressures PRIMARY KEY(id),
|
||
|
|
CONSTRAINT fk_pressures_measured_value_id FOREIGN KEY(measured_value_id) REFERENCES measured_values(id) ON DELETE CASCADE ON UPDATE CASCADE
|
||
|
|
);
|
||
|
|
|
||
|
|
ALTER TABLE temperatures
|
||
|
|
RENAME TO temperatures_backup;
|
||
|
|
|
||
|
|
CREATE TABLE temperatures (
|
||
|
|
id CHAR(36) NOT NULL,
|
||
|
|
value NUMERIC(10,3) NOT NULL,
|
||
|
|
date TIMESTAMP NOT NULL,
|
||
|
|
measured_value_id CHAR(36) NOT NULL,
|
||
|
|
creation_date TIMESTAMP DEFAULT (datetime('now', 'localtime')) NOT NULL,
|
||
|
|
update_date TIMESTAMP,
|
||
|
|
CONSTRAINT pk_temperatures PRIMARY KEY(id),
|
||
|
|
CONSTRAINT fk_temperatures_measured_value_id FOREIGN KEY(measured_value_id) REFERENCES measured_values(id) ON DELETE CASCADE ON UPDATE CASCADE
|
||
|
|
);
|
||
|
|
|
||
|
|
-- The following two views are necessary to create a FULL OUTER JOIN via the
|
||
|
|
-- tables humidities, pressures and temperatures, as this is not supported in
|
||
|
|
-- SQLite. More about this here:
|
||
|
|
--
|
||
|
|
-- https://stackoverflow.com/questions/12759087/full-outer-join-in-sqlite-on-4-tables
|
||
|
|
CREATE VIEW humidities_pressures AS
|
||
|
|
SELECT
|
||
|
|
h.id AS humidity_id,
|
||
|
|
h.value AS humidity_value,
|
||
|
|
h.date AS humidity_date,
|
||
|
|
h.sensor_id AS humidity_sensor_id,
|
||
|
|
h.creation_date AS humidity_creation_date,
|
||
|
|
h.update_date AS humidity_update_date,
|
||
|
|
p.id AS pressure_id,
|
||
|
|
p.value AS pressure_value,
|
||
|
|
p.date AS pressure_date,
|
||
|
|
p.sensor_id AS pressure_sensor_id,
|
||
|
|
p.creation_date AS pressure_creation_date,
|
||
|
|
p.update_date AS pressure_update_date
|
||
|
|
FROM humidities_backup h
|
||
|
|
LEFT JOIN pressures_backup p ON (h.date = p.date AND h.sensor_id = p.sensor_id)
|
||
|
|
UNION ALL
|
||
|
|
SELECT
|
||
|
|
h.id AS humidity_id,
|
||
|
|
h.value AS humidity_value,
|
||
|
|
h.date AS humidity_date,
|
||
|
|
h.sensor_id AS humidity_sensor_id,
|
||
|
|
h.creation_date AS humidity_creation_date,
|
||
|
|
h.update_date AS humidity_update_date,
|
||
|
|
p.id AS pressure_id,
|
||
|
|
p.value AS pressure_value,
|
||
|
|
p.date AS pressure_date,
|
||
|
|
p.sensor_id AS pressure_sensor_id,
|
||
|
|
p.creation_date AS pressure_creation_date,
|
||
|
|
p.update_date AS pressure_update_date
|
||
|
|
FROM pressures_backup p
|
||
|
|
LEFT JOIN humidities_backup h ON (p.date = h.date AND p.sensor_id = h.sensor_id)
|
||
|
|
WHERE h.date IS NULL
|
||
|
|
AND h.sensor_id IS NULL;
|
||
|
|
|
||
|
|
CREATE VIEW joined_values AS
|
||
|
|
SELECT
|
||
|
|
hp.*,
|
||
|
|
t.id AS temperature_id,
|
||
|
|
t.value AS temperature_value,
|
||
|
|
t.date AS temperature_date,
|
||
|
|
t.sensor_id AS temperature_sensor_id,
|
||
|
|
t.creation_date AS temperature_creation_date,
|
||
|
|
t.update_date AS temperature_update_date
|
||
|
|
FROM temperatures_backup t
|
||
|
|
LEFT JOIN humidities_pressures hp ON (t.date = hp.pressure_date AND t.sensor_id = hp.pressure_sensor_id)
|
||
|
|
UNION ALL
|
||
|
|
SELECT
|
||
|
|
hp.*,
|
||
|
|
t.id AS temperature_id,
|
||
|
|
t.value AS temperature_value,
|
||
|
|
t.date AS temperature_date,
|
||
|
|
t.sensor_id AS temperature_sensor_id,
|
||
|
|
t.creation_date AS temperature_creation_date,
|
||
|
|
t.update_date AS temperature_update_date
|
||
|
|
FROM humidities_pressures hp
|
||
|
|
LEFT JOIN temperatures_backup t ON (t.date = hp.pressure_date AND t.sensor_id = hp.pressure_sensor_id)
|
||
|
|
WHERE t.date IS NULL
|
||
|
|
AND t.sensor_id IS NULL;
|
||
|
|
|
||
|
|
-- The date and the SensorID are used as primary key between the tables
|
||
|
|
-- humidities, pressures and temperatures. Based on this information, a
|
||
|
|
-- MeasuredValueID is generated. The data records are then inserted into the
|
||
|
|
-- table.
|
||
|
|
INSERT INTO measured_values (id, creation_date, sensor_id)
|
||
|
|
SELECT
|
||
|
|
LOWER(HEX(RANDOMBLOB(4)) || '-' || HEX(RANDOMBLOB(2)) || '-' || '4' || SUBSTR(HEX(RANDOMBLOB(2)), 2) || '-' || SUBSTR('AB89', 1 + (ABS(random()) % 4) , 1) || SUBSTR(HEX(RANDOMBLOB(2)), 2) || '-' || HEX(RANDOMBLOB(6))) AS measured_value_id,
|
||
|
|
CASE WHEN humidity_date IS NOT NULL THEN humidity_date
|
||
|
|
WHEN pressure_date IS NOT NULL THEN pressure_date
|
||
|
|
WHEN temperature_date IS NOT NULL THEN temperature_date
|
||
|
|
ELSE NULL
|
||
|
|
END date,
|
||
|
|
CASE WHEN humidity_sensor_id IS NOT NULL THEN humidity_sensor_id
|
||
|
|
WHEN pressure_sensor_id IS NOT NULL THEN pressure_sensor_id
|
||
|
|
WHEN temperature_sensor_id IS NOT NULL THEN temperature_sensor_id
|
||
|
|
ELSE NULL
|
||
|
|
END sensor_id
|
||
|
|
FROM joined_values;
|
||
|
|
|
||
|
|
-- In the following, the original data records from the backup are restored with
|
||
|
|
-- the difference that the MeasuredValueID is added as a foreign key based on
|
||
|
|
-- the date and the SensorID.
|
||
|
|
INSERT INTO humidities (id, value, date, measured_value_id, creation_date, update_date)
|
||
|
|
SELECT
|
||
|
|
jv.humidity_id,
|
||
|
|
jv.humidity_value,
|
||
|
|
jv.humidity_date,
|
||
|
|
(SELECT mv.id FROM measured_values mv WHERE mv.creation_date = jv.humidity_date AND mv.sensor_id = jv.humidity_sensor_id) AS measured_value,
|
||
|
|
jv.humidity_creation_date,
|
||
|
|
jv.humidity_update_date
|
||
|
|
FROM joined_values jv
|
||
|
|
WHERE humidity_id IS NOT NULL;
|
||
|
|
|
||
|
|
INSERT INTO pressures (id, value, date, measured_value_id, creation_date, update_date)
|
||
|
|
SELECT
|
||
|
|
jv.pressure_id,
|
||
|
|
jv.pressure_value,
|
||
|
|
jv.pressure_date,
|
||
|
|
(SELECT mv.id FROM measured_values mv WHERE mv.creation_date = jv.pressure_date AND mv.sensor_id = jv.pressure_sensor_id) AS measured_value,
|
||
|
|
jv.pressure_creation_date,
|
||
|
|
jv.pressure_update_date
|
||
|
|
FROM joined_values jv
|
||
|
|
WHERE pressure_id IS NOT NULL;
|
||
|
|
|
||
|
|
INSERT INTO temperatures (id, value, date, measured_value_id, creation_date, update_date)
|
||
|
|
SELECT
|
||
|
|
jv.temperature_id,
|
||
|
|
jv.temperature_value,
|
||
|
|
jv.temperature_date,
|
||
|
|
(SELECT mv.id FROM measured_values mv WHERE mv.creation_date = jv.temperature_date AND mv.sensor_id = jv.temperature_sensor_id) AS measured_value,
|
||
|
|
jv.temperature_creation_date,
|
||
|
|
jv.temperature_update_date
|
||
|
|
FROM joined_values jv
|
||
|
|
WHERE temperature_id IS NOT NULL;
|
||
|
|
|
||
|
|
-- The remaining views and tables, which were only necessary for the migration,
|
||
|
|
-- are now removed.
|
||
|
|
DROP VIEW humidities_pressures;
|
||
|
|
DROP VIEW joined_values;
|
||
|
|
DROP TABLE humidities_backup;
|
||
|
|
DROP TABLE pressures_backup;
|
||
|
|
DROP TABLE temperatures_backup;
|