mysql中的定時器及儲存過程

需求：今天遇到mysql中的日誌表需要設定最大儲存量、最多儲存天數，多餘的刪除

儲存過程**如下：

delimiter //

drop procedure if exists log_system; 
create procedure log_system (in u_n int,u_d int,s_n int,s_d int)//u_d使用者日誌天數，u_n使用者日誌數，s_n系統日誌數，s_d系統日誌天數
begin
set u_d = (select userloggingdate from logging_prameter); //通過設定表得到使用者日誌天數
delete  from user_logging  
where time <= (select date_add(sysdate(),interval - u_d day) as yestoday);//通過演算法算出系統時間前去使用者日誌天數，得到應該刪除的時間點
if (select count(*) from user_logging) > (select userloggingnumber from logging_prameter) then
set u_n = (select count(*) from user_logging)-(select userloggingnumber from logging_prameter);
delete from user_logging order by time limit u_n;
end if;
set s_d = (select sysloggingdate from logging_prameter); 
delete  from sys_logging  where time <= (select date_add(sysdate(),interval - s_d day) as yestoday);
if (select count(*) from sys_logging) > (select sysloggingnumber from logging_prameter) then
set s_n = (select count(*) from sys_logging)-(select sysloggingnumber from logging_prameter);
delete from sys_logging order by time limit s_n;
end if;
end;
//delimiter

定時器**如下：

delimiter //

set global event_scheduler = on;  
drop event if exists `eventsysuserlogging`;  
create    event if not exists `eventsysuserlogging`  
on schedule  
every 1 day   
starts timestamp(current_date,'17:30:00')  
on completion preserve enable  
do  
begin  
call log_system(@u_n,@u_n,@s_n,@s_d);//呼叫儲存過程
end;  
// delimiter

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