Question

I’m trying to set up a stored proc that (in part) drops a user. I’ve tried several versions of DROP USER that “expand” the argument and I can’t find one that works. Can someone help?

DELIMITER //
CREATE PROCEDURE `dropuser`( IN inUser varchar(255) )
BEGIN
  #DROP USER concat(inUser,"@localhost");
  #DROP USER inUser "@localhost";
  #DROP USER "inUser@localhost";
END//
DELIMITER ;

CALL dropuser("asdf");

All three of them fail in the same way:

ERROR 1064 (42000) at line 4: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '(inUser,"@localhost");

Obviously I’m getting the expansion wrong.

Answer 1

delimiter //
drop procedure if exists dropuser //
create procedure dropuser( in inUser varchar(255) )
begin
  set @str = concat('drop user ', "'",inUser,"'@","'localhost'");
  prepare stmt from @str;
  -- select @str;  
  execute stmt;
  deallocate prepare stmt;
end//
delimiter ;

call dropuser('pippo');