Mysql Event Update and search

Question

I have a demo database where I need to set the status back to 0 each night in any table where userid = '1'

Is it possible to do that in the mySql event scheduler? Or do I need to specify each query individually?

So for example: Update "table" set status='0' where userid='1'.

Answer 1

Personally, I think your currently method is the most sensible. But some other options might include:

• a multi-table UPDATE, however you'd still have to explicitly name each table - so I'm not sure it gains you much (except perhaps a little obfuscation) and it'll almost certainly have worse performance from performing the joins:

  UPDATE
  FROM
         table1
    JOIN table2 USING (userid)
    JOIN table3 USING (userid)
    JOIN table4 USING (userid)
    JOIN table5 USING (userid)
  SET
    table1.status = '0',
    table2.status = '0',
    table3.status = '0',
    table4.status = '0',
    table5.status = '0'
  WHERE userid = '1';
  

• dynamically constructing your current series of UPDATE queries using prepared statements - but unless you are frequently changing the number or names of your tables, I don't really see the point:

  SET @qry = (
    SELECT GROUP_CONCAT(
        "UPDATE `",
        REPLACE(table_name, "`", "``"), -- in case you have strange table names
        "` SET status='0' WHERE userid='1';"
    )
    FROM INFORMATION_SCHEMA.TABLES
    WHERE table_schema = 'db_name'
  );
  
  PREPARE stmt FROM @qry;
  EXECUTE stmt;
  DEALLOCATE PREPARE stmt;