mirror of
https://github.com/LemmyNet/lemmy.git
synced 2024-12-05 18:51:24 +00:00
37 lines
1.1 KiB
MySQL
37 lines
1.1 KiB
MySQL
|
-- This file was automatically created by Diesel to setup helper functions
|
||
|
-- and other internal bookkeeping. This file is safe to edit, any future
|
||
|
-- changes will be added to existing projects as new migrations.
|
||
|
|
||
|
|
||
|
|
||
|
|
||
|
-- Sets up a trigger for the given table to automatically set a column called
|
||
|
-- `updated_at` whenever the row is modified (unless `updated_at` was included
|
||
|
-- in the modified columns)
|
||
|
--
|
||
|
-- # Example
|
||
|
--
|
||
|
-- ```sql
|
||
|
-- CREATE TABLE users (id SERIAL PRIMARY KEY, updated_at TIMESTAMP NOT NULL DEFAULT NOW());
|
||
|
--
|
||
|
-- SELECT diesel_manage_updated_at('users');
|
||
|
-- ```
|
||
|
CREATE OR REPLACE FUNCTION diesel_manage_updated_at(_tbl regclass) RETURNS VOID AS $$
|
||
|
BEGIN
|
||
|
EXECUTE format('CREATE TRIGGER set_updated_at BEFORE UPDATE ON %s
|
||
|
FOR EACH ROW EXECUTE PROCEDURE diesel_set_updated_at()', _tbl);
|
||
|
END;
|
||
|
$$ LANGUAGE plpgsql;
|
||
|
|
||
|
CREATE OR REPLACE FUNCTION diesel_set_updated_at() RETURNS trigger AS $$
|
||
|
BEGIN
|
||
|
IF (
|
||
|
NEW IS DISTINCT FROM OLD AND
|
||
|
NEW.updated_at IS NOT DISTINCT FROM OLD.updated_at
|
||
|
) THEN
|
||
|
NEW.updated_at := current_timestamp;
|
||
|
END IF;
|
||
|
RETURN NEW;
|
||
|
END;
|
||
|
$$ LANGUAGE plpgsql;
|