我正在收集路由器的传输数据;它提供每日,每月和每分钟(120秒的间隔)摘要。如果我在一天中间(因此在一个月中)重新启动路由器,那么这些报告将是不完整的。但是,我仍然会有间隔数据,可以在启动之前和之后对记录进行求和。
以前,我在更新三个单独的表后使用脚本执行了此汇总操作。这很慢,因为我必须查询给定的一天间隔的总和,然后是月间隔。更新间隔时执行汇总会更快。所以我把一个触发器放在一起。问题是我编写触发器的方式,它更新每个间隔插入的每日和每月行。理想情况下,每个事务只会发生一次,并处理刚刚添加的行。
所以,下面是一个包含的示例,显示了我的内容。 count列就是为了说明汇总发生的次数超出了需要。有没有办法简化这一点?
BEGIN TRANSACTION;
CREATE TABLE monthly (count INTEGER DEFAULT 0, date DATE NOT NULL, interface TEXT NOT NULL, upload INTEGER DEFAULT 0, download INTEGER DEFAULT 0, rollup_upload INTEGER DEFAULT 0, rollup_download INTEGER DEFAULT 0, PRIMARY KEY (date, interface));
CREATE TABLE daily (count INTEGER DEFAULT 0, date DATE NOT NULL, interface TEXT NOT NULL, upload INTEGER DEFAULT 0, download INTEGER DEFAULT 0, rollup_upload INTEGER DEFAULT 0, rollup_download INTEGER DEFAULT 0, PRIMARY KEY (date, interface));
CREATE TABLE interval (count INTEGER DEFAULT 0, date DATE NOT NULL, interface TEXT NOT NULL, upload INTEGER DEFAULT 0, download INTEGER DEFAULT 0, interval INTEGER, PRIMARY KEY (date, interface));
CREATE TRIGGER rollup_interval_trigger AFTER INSERT ON interval
BEGIN
INSERT OR REPLACE INTO daily (count, date, interface, upload, download, rollup_upload, rollup_download)
SELECT
COALESCE((SELECT count FROM daily WHERE date IS strftime('%Y-%m-%d', NEW.date, 'localtime') AND interface IS 'wan'),0)+1,
strftime('%Y-%m-%d', NEW.date, 'localtime'),
'wan',
COALESCE((SELECT upload FROM daily WHERE date IS strftime('%Y-%m-%d', NEW.date, 'localtime') AND interface IS 'wan'),0),
COALESCE((SELECT download FROM daily WHERE date IS strftime('%Y-%m-%d', NEW.date, 'localtime') AND interface IS 'wan'),0),
sum(upload) as rollup_upload,
sum(download) as rollup_download
FROM interval
WHERE strftime('%Y-%m-%d', date, 'localtime') = strftime('%Y-%m-%d', NEW.date, 'localtime') AND interface IS 'vlan2';
INSERT OR REPLACE INTO monthly (count, date, interface, upload, download, rollup_upload, rollup_download)
SELECT
COALESCE((SELECT count FROM monthly WHERE date IS strftime('%Y-%m-01', NEW.date, 'localtime') AND interface IS 'wan'),0)+1,
strftime('%Y-%m-01', NEW.date, 'localtime'),
'wan',
COALESCE((SELECT upload FROM monthly WHERE date IS strftime('%Y-%m-01', NEW.date, 'localtime') AND interface IS 'wan'),0),
COALESCE((SELECT download FROM monthly WHERE date IS strftime('%Y-%m-01', NEW.date, 'localtime') AND interface IS 'wan'),0),
sum(upload) as rollup_upload,
sum(download) as rollup_download
FROM interval
WHERE strftime('%Y-%m', date, 'localtime') = strftime('%Y-%m', NEW.date, 'localtime') AND interface IS 'vlan2';
END;
COMMIT;
insert into daily (date, interface, download, upload) values ('2012-10-02', 'wan', 10, 20);
insert into monthly (date, interface, download, upload) values ('2012-10-01', 'wan', 30, 40);
.headers ON
select * from daily;
select * from monthly;
begin transaction;
insert into interval (date, interval, download, upload, interface) values ('2012-10-02 11:00:00', 120, 10, 20, 'vlan2');
insert into interval (date, interval, download, upload, interface) values ('2012-10-02 12:00:00', 120, 10, 20, 'vlan2');
insert into interval (date, interval, download, upload, interface) values ('2012-10-02 13:00:00', 120, 10, 20, 'vlan2');
insert into interval (date, interval, download, upload, interface) values ('2012-10-02 14:00:00', 120, 10, 20, 'vlan2');
insert into interval (date, interval, download, upload, interface) values ('2012-10-01 12:00:00', 120, 10, 20, 'vlan2');
insert into interval (date, interval, download, upload, interface) values ('2012-10-03 12:00:00', 120, 10, 20, 'vlan2');
commit;
select * from interval;
select * from daily;
select * from monthly;
答案 0 :(得分:1)
如果仅通过插入间隔的新数字来增加每日和每月的计数呢?然后你不会在每个插入上聚合。你只需要通过主键和该行的更新对一行进行两次查找。
CREATE TRIGGER rollup_interval_trigger AFTER INSERT ON interval
BEGIN
INSERT INTO daily
SELECT 0, strftime('%Y-%m-%d', NEW.date, 'localtime'), 'wan',0,0,0,0
WHERE NOT EXISTS (
SELECT 1
FROM daily
WHERE date = strftime('%Y-%m-%d', NEW.date, 'localtime') and interface = 'wan');
UPDATE daily
SET count = count + 1,
rollup_upload = rollup_upload + new.upload ,
rollup_download = rollup_download + new.download
WHERE date = strftime('%Y-%m-%d', NEW.date, 'localtime') and interface = 'wan';
-- and similarly for table monthly
END;
由于sqlite没有'upsert'语句,因此在更新之前,您需要有一个单独的语句来创建每日/每月记录。
这会产生与测试数据触发器相同的结果。
<强> PS 强>
如果你想要的话,你可以用INSERT或IGNORE替换INSERT ... WHERE NOT EXISTS以获得最大性能(我不太喜欢它,因为它捕获所有冲突,而不仅仅是唯一的约束,并且通常可能隐藏其他错误。)