每天凌晨计算上一天的数据，并把结果存储到表中，表名按照日期动态创建

事件

event_alert_level_count

create event event_alert_level_count
on schedule every 1 day starts timestamp(current_date,'00:00:00')
do  call proc_alert_level_count() ;

存储过程

proc_alert_level_count

CREATE DEFINER=`test`@`%` PROCEDURE `proc_alert_level_count`()
BEGINDECLARE yesterday CHAR(8) DEFAULT '';DECLARE low BIGINT DEFAULT 0;DECLARE lowCount BIGINT DEFAULT 0;set yesterday = REPLACE(CURRENT_DATE() - INTERVAL 1 DAY,"-","");
-- 	SELECT yesterday;set @sqlStrLow = concat('select count(alert_level) from log_alert_info_', yesterday, ' where alert_level = 1 into @low');
--  SELECT @sqlStrLow;PREPARE stmtLow from @sqlStrLow;EXECUTE stmtLow; DEALLOCATE PREPARE stmtLow;SET lowCount = @low;insert into history_alert_level_count(date_name, low_level) VALUES(yesterday, lowCount);END

附录

把查询结果传入变量

select id into variable from table

拼接sql字符串并执行

set @sqlStr = concat('select ', variable1, ' from table_', 'variable2');
PREPARE stmt from @sqlStr;
EXECUTE stmt;

在拼接的sql中把查询结果传入变量

set @sqlStrLow = concat('select count(alert_level) from log_alert_info_', yesterday, ' where alert_level = 1 into @low');
--  SELECT @sqlStrLow;PREPARE stmtLow from @sqlStrLow;
EXECUTE stmtLow; DEALLOCATE PREPARE stmtLow;
SET lowCount = @low;