42 lines
1.3 KiB
MySQL
42 lines
1.3 KiB
MySQL
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-- SPDX-FileCopyrightText: 2017 Sage Griffin <sage@sagetheprogrammer.com>
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-- SPDX-FileCopyrightText: 2016 Robert Maloney <robertjamesmaloney@gmail.com>
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--
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-- SPDX-License-Identifier: Apache-2.0 OR MIT
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-- This file was automatically created by Diesel to setup helper functions
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-- and other internal bookkeeping. This file is safe to edit, any future
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-- changes will be added to existing projects as new migrations.
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-- Sets up a trigger for the given table to automatically set a column called
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-- `updated_at` whenever the row is modified (unless `updated_at` was included
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-- in the modified columns)
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--
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-- # Example
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--
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-- ```sql
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-- CREATE TABLE users (id SERIAL PRIMARY KEY, updated_at TIMESTAMP NOT NULL DEFAULT NOW());
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--
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-- SELECT diesel_manage_updated_at('users');
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-- ```
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CREATE OR REPLACE FUNCTION diesel_manage_updated_at(_tbl regclass) RETURNS VOID AS $$
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BEGIN
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EXECUTE format('CREATE TRIGGER set_updated_at BEFORE UPDATE ON %s
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FOR EACH ROW EXECUTE PROCEDURE diesel_set_updated_at()', _tbl);
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END;
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$$ LANGUAGE plpgsql;
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CREATE OR REPLACE FUNCTION diesel_set_updated_at() RETURNS trigger AS $$
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BEGIN
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IF (
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NEW IS DISTINCT FROM OLD AND
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NEW.updated_at IS NOT DISTINCT FROM OLD.updated_at
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) THEN
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NEW.updated_at := current_timestamp;
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END IF;
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RETURN NEW;
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END;
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$$ LANGUAGE plpgsql;
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