UPDATE/DELETE in mysql and get the list of affected row ids?

Question

Is there an efficient way to get the list of affected row IDs (not the # of affected rows via PHP\'s mysql_affected_rows(), but the actual row ids that were affected) from a

Answer 1

try this, it will return the updated ids as "1,2,3....":

SET @uids := '';
UPDATE table_name
   SET some_col= 'some_val'
 WHERE some_col= 'some_val'
   AND ( SELECT @uids := CONCAT_WS(',', @uids, id) );
SELECT TRIM(LEADING ',' FROM @uids);

Answer 2

You can create a Trigger

Support for triggers is included beginning with MySQL 5.0.2. A trigger is a named database object that is associated with a table, and that activates when a particular event occurs for the table.

the following code creates a trigger on a table named mytable which has a field id

CREATE TRIGGER mytable_delete
AFTER DELETE ON mytable
FOR EACH ROW SET @deletedIDs = CONCAT_WS(',', @deletedIDs, OLD.id)

notice that OLD refers to deleted row

once you created a trigger on a table you can use it as follows:

/* empty parameter defined in CREATE TRIGGER */
Set @deletedIDs = '';
/* perform your query */
DELETE FROM mytable WHERE myotherfield = 'myfilterevalue';
/* get the parameter */
SELECT @deletedIDs AS 'Deleted_IDs';

this will return deleted IDs each preceded by a comma in a string

sql mysql php