#--- start

# 新建表

create table sp2_match_comment_tmp like sp2_match_comment; # 這種方式 外鍵索引，觸發(fā)器不會在新表中有，要自己添加

LOCK TABLES sp2_match_comment write, sp2_match_comment AS smc2 read, sp2_match_comment_tmp write;

# 導(dǎo)出最新數(shù)據(jù)到新表

insert into sp2_match_comment_tmp

select * from sp2_match_comment where id >

(select id from sp2_match_comment AS smc2 where addtime

# 原表改為備份表

alter table sp2_match_comment rename to @backup_table;

# 新表成為原表，

alter table sp2_match_comment_tmp rename to sp2_match_comment;

# 觸發(fā)器 start ---

USE `spider_news`;

DELIMITER $$

DROP TRIGGER IF EXISTS spider_news.sp2_match_comment_AFTER_INSERT$$

USE `spider_news`$$

CREATE DEFINER=`shihe`@`%` TRIGGER `spider_news`.`sp2_match_comment_AFTER_INSERT` AFTER INSERT ON `sp2_match_comment` FOR EACH ROW

BEGIN

update sp2_match_news set cmt_num=cmt_num+1 where id=new.match_news_id;

update sh_article set cmt_num=cmt_num+1 where id in (

select article_id from sp2_article_match_news where match_news_id=new.match_news_id

);

END$$

DELIMITER ;

# 觸發(fā)器 end ---

UNLOCK TABLES;

delete from @backup_table where id >= (select id from sp2_match_comment order by id limit 1);

# ---end

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