1.语法讲解
SET GLOBAL event_scheduler = 1;
或SET GLOBAL event_scheduler = ON;
来开启,也可以直接在启动命令加上“–event_scheduler=1”,例如:
mysqld ... --event_scheduler=1
my.ini or my.cnf 中的
[mysqld]
添加 event_scheduler=ON
创建事件(CREATE EVENT)
先来看一下它的语法:
CREATE EVENT [IF NOT EXISTS] event_name
ON SCHEDULE schedule
[ON COMPLETION [NOT] PRESERVE]
[ENABLE | DISABLE]
[COMMENT 'comment']
DO sql_statement;
schedule:
AT TIMESTAMP [+ INTERVAL INTERVAL]
| EVERY INTERVAL [STARTS TIMESTAMP] [ENDS TIMESTAMP]
INTERVAL:
quantity {YEAR | QUARTER | MONTH | DAY | HOUR | MINUTE |
WEEK | SECOND | YEAR_MONTH | DAY_HOUR | DAY_MINUTE |
DAY_SECOND | HOUR_MINUTE | HOUR_SECOND | MINUTE_SECOND}
2.实际演示
实例1:
public function addorder() {
$data ['order_sn'] = '5555588888';
$data ['user_id'] = 5555;
$data ['status'] = 0;
$data ['goods_id'] = 1555;
$data ['sku_id'] = 0;
$data ['price'] = 50;
$re = M ( 'big.ih_order' )->add ( $data );
if ($re) {
$sql = "CREATE EVENT order_".$re."
ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 1 MINUTE
ON COMPLETION NOT PRESERVE
DO
begin
update big.ih_order set status=1 where id=".$re.";
update big.ih_store set number=number+1 where id=1;
end
";
$res=M()->execute($sql);
}
echo $re;
echo '<br/>';
echo $res;
}
实例2
public function addorderevent($uid=21,$oid=602){
$otime = M('chaindb.user_set')->field('otime')->where("uid={$uid}")->find();
if(!empty($otime)&&$otime['otime']>0){
/*/*查询已经过期订单,并还原对应库存
*/
$sql = "CREATE EVENT order_".$oid."
ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL ".$otime['otime']." SECOND
ON COMPLETION NOT PRESERVE
DO
begin
update chaindb.cus_order as co, chaindb.user_goods as g,chaindb.cus_order_detail as o set g.inventory=g.inventory+o.quantity,g.sales=g.sales-o.quantity,co.ostatus=0 where co.oid=".$oid." and co.ostatus=1 and co.pstatus=0 and (co.paytype=0 or co.paytype>1) and co.oid=o.oid and o.oid=".$oid." and g.gid=o.gid and o.aid=0;
update chaindb.cus_order as co, chaindb.user_goods as g,chaindb.cus_order_detail as o,chaindb.user_goods_attr as a set a.inventory=a.inventory+o.quantity,g.sales=g.sales-o.quantity,co.ostatus=0 where co.oid=".$oid." and co.ostatus=1 and co.pstatus=0 and (co.paytype=0 or co.paytype>1) and co.oid=o.oid and o.oid=".$oid." and g.gid=o.gid and o.aid>0 and o.aid=a.aid;
end
";
$res=M()->execute($sql);
}
}