mysql bulk update multiple records at once - mysql

Question

I have data such as:
id table column add edit delete view
1 vendors city 0 0 0 1
1 vendors state 0 0 0 1
1 vendors zip 0 0 0 1
And i am trying to perform a bulk update with a similar query:
UPDATE user_perms SET add = ?, edit = ?, delete = ?, view = ?
WHERE id = ? AND table_name = ? AND column_name = ?
Without having to loop through a list and run this query X number of times, does MySQL support a way to bulk update in 1 go?
CREATE TABLE STMT:
CREATE TABLE `user_perms` (
`up_id` int unsigned NOT NULL AUTO_INCREMENT,
`id` int unsigned DEFAULT NULL,
`table_name` varchar(255) DEFAULT NULL,
`column_name` varchar(255) DEFAULT NULL,
`add` int unsigned DEFAULT NULL,
`edit` int unsigned DEFAULT NULL,
`delete` int unsigned DEFAULT NULL,
`view` int unsigned DEFAULT NULL,
PRIMARY KEY (`up_id`),
UNIQUE KEY `up_id_UNIQUE` (`up_id`),
KEY `fk_idx` (`id`),
CONSTRAINT `fk_id` FOREIGN KEY (`id`) REFERENCES `users` (`user_id`) ON DELETE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=1659 DEFAULT CHARSET=utf8

Answer 1

In your case, the closest thing you could do to update multiple rows is to set the values using CASE expressions:
UPDATE user_perms
SET add = CASE column_name WHEN 'city' THEN ? WHEN 'state' THEN ? WHEN 'zip' THEN ? END,
edit = CASE column_name WHEN 'city' THEN ? WHEN 'state' THEN ? WHEN 'zip' THEN ? END,
delete = CASE column_name WHEN 'city' THEN ? WHEN 'state' THEN ? WHEN 'zip' THEN ? END,
view = CASE column_name WHEN 'city' THEN ? WHEN 'state' THEN ? WHEN 'zip' THEN ? END
WHERE id = ? AND table_name = ?;
It would be even more complicated if you wanted to put both table_name and column_name into the CASE expression.
Frankly, it's easier to just write the loop and do this one row at a time.
If you had a unique key for example comprised of the columns (id, table_name, column_name) so SQL could detect when it was inserting a duplicate row, you could do the following:
INSERT INTO user_perms (id, table_name, column_name, add, edit, delete, view)
VALUES (1, 'vendors', 'city', 0, 0, 0, 1),
(1, 'vendors', 'state', 0, 0, 0, 1),
(1, 'vendors', 'zip', 0, 0, 0, 1)
-- any number of additional tuples follow
ON DUPLICATE KEY UPDATE add = VALUES(add), edit = VALUES(edit),
delete = VALUES(delete), view = VALUES(view);
If this worked, you would not need to delete the rows first. INSERT .. ON DUPLICATE KEY UPDATE is intended to insert a new row if the data you insert does not conflict with an existing row, but if the values you insert do conflict with a unique key on the table, it updates only those columns you set, according to the UPDATE clause. Read the documentation for more details.