91 lines
3.5 KiB
MySQL
91 lines
3.5 KiB
MySQL
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-- All tables with the original data rows must be renamed, because it is not
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-- possible to remove existing foreign keys. The tables will be recreated with
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-- a new column measured_value_id which reference on the primary key of the
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-- table measured values.
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--
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-- More about why it is not possible to delete a foreign key is described here:
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-- https://stackoverflow.com/a/1884893/7652996
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ALTER TABLE humidities
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RENAME TO humidities_backup;
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CREATE TABLE humidities (
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id CHAR(36) NOT NULL,
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value NUMERIC(10,3) NOT NULL,
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date TIMESTAMP NOT NULL,
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sensor_id CHAR(36) NOT NULL,
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creation_date TIMESTAMP DEFAULT (datetime('now', 'localtime')) NOT NULL,
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update_date TIMESTAMP,
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CONSTRAINT pk_humidities PRIMARY KEY(id),
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CONSTRAINT fk_humidities_sensor_id FOREIGN KEY(sensor_id) REFERENCES sensors(sensor_id) ON DELETE CASCADE ON UPDATE CASCADE
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);
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ALTER TABLE pressures
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RENAME TO pressures_backup;
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CREATE TABLE pressures (
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id CHAR(36) NOT NULL,
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value NUMERIC(10,3) NOT NULL,
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date TIMESTAMP NOT NULL,
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sensor_id CHAR(36) NOT NULL,
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creation_date TIMESTAMP DEFAULT (datetime('now', 'localtime')) NOT NULL,
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update_date TIMESTAMP,
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CONSTRAINT pk_pressures PRIMARY KEY(id),
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CONSTRAINT fk_pressures_sensor_id FOREIGN KEY(sensor_id) REFERENCES sensors(sensor_id) ON DELETE CASCADE ON UPDATE CASCADE
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);
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ALTER TABLE temperatures
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RENAME TO temperatures_backup;
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CREATE TABLE temperatures (
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id CHAR(36) NOT NULL,
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value NUMERIC(10,3) NOT NULL,
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date TIMESTAMP NOT NULL,
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sensor_id CHAR(36) NOT NULL,
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creation_date TIMESTAMP DEFAULT (datetime('now', 'localtime')) NOT NULL,
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update_date TIMESTAMP,
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CONSTRAINT pk_temperatures PRIMARY KEY(id),
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CONSTRAINT fk_temperatures_id FOREIGN KEY(sensor_id) REFERENCES sensors(sensor_id) ON DELETE CASCADE ON UPDATE CASCADE
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);
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-- Filling tables humidities, pressures and temperatures with the data from the
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-- backup table.
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INSERT INTO humidities
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SELECT
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h.id,
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h.value,
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h.date,
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m.sensor_id,
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h.creation_date,
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h.update_date
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FROM humidities_backup h
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INNER JOIN measured_values m ON (m.id = h.measured_value_id);
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INSERT INTO pressures
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SELECT
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p.id,
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p.value,
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p.date,
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m.sensor_id,
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p.creation_date,
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p.update_date
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FROM pressures_backup p
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INNER JOIN measured_values m ON (m.id = p.measured_value_id);
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INSERT INTO temperatures
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SELECT
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t.id,
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t.value,
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t.date,
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m.sensor_id,
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t.creation_date,
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t.update_date
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FROM temperatures_backup t
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INNER JOIN measured_values m ON (m.id = t.measured_value_id);
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-- The remaining tables, which were only necessary for the migration,
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-- are now removed.
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DROP TABLE humidities_backup;
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DROP TABLE pressures_backup;
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DROP TABLE temperatures_backup;
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DROP TABLE measured_values;
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