SELECT Id INTO @Id FROM GiftCode WHERE Status = 1 AND GiftId = #GiftId# ORDER BY Id ASC LIMIT 1; UPDATE GiftCode SET UsedTime = NOW(),Status = 2,AccountId = #AccountId# WHERE Id = @Id; SELECT * FROM GiftCode WHERE Id = @Id; 如题,这3句SQL,在SQLSE
[root@dr-mysql01 sbin]# cat t1.pl use DBI; my $dbUser='DEVOPS'; my $user="root"; my $passwd="1234567"; $gp=$ARGV[0]; my @arr2=""; my $dbh = DBI->connect("dbi:mysql:database=DEVOPS;host=192.168.32.161;port=3306",$
说明:MySQL的offset第一行是0 位置指的是在SELECT语句中第几个出现的字段,如:1,则代表用第一个出现的字段来分组. SELECT语句: SELECT select_expr1 [,select_expr2......] [ FROM 表名 [WHERE where_condition] [GROUP BY {列名|位置} [ASC | DESC],.....] //对查询结果进行分组,如:SELECT sex,id FROM tb1 GROUP BY
24小时内记录(即86400秒) $sql="SELECT video_id,count(id)as n FROM `rec_down` WHERE UNIX_TIMESTAMP(NOW())-UNIX_TIMESTAMP(add_time)<=86400 group by video_id order by n desc ";$sql="select a.id,a.title,b.n from video_info a,(".$sql.")b wh
问题说明: 最近遇到一个问题,多个WORKER同时向MYSQL数据库请求任务,如何实现互斥?例如: SELECT * FROM student WHERE id > 10 LIMIT 100; UPDATE student SET status = 1 WHERE id > 10 LIMIT 100; 当有多个WORKER执行上面两条语句,那么很可能都执行同样的数据,造成线上问题,比如WORDER1执行SELECT之后,还没有执行UPDATE之前,WORDER2也执行了SELECT语句,造成问