我可以让 SQL Server 每 n 秒调用一次存储过程吗? [英] Can I get SQL Server to call a stored proc every n seconds?
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问题描述
我希望有一个每 n 秒调用一次的存储过程,有没有办法在 SQL Server 中执行此操作而不依赖于单独的进程?
I wish to have a stored proc that is called every n seconds, is there a way to do this in SQL Server without depending on a separate process?
推荐答案
使用 计时器 和激活.没有外部进程,在集群或镜像故障转移后继续工作,即使在另一台机器上恢复后也继续工作,它也适用于 Express.
Use a timer and activation. No external process, continues to work after a clustering or mirroring failover, continues to work even after a restore on a different machine, and it works on Express too.
-- create a table to store the results of some dummy procedure
create table Activity (
InvokeTime datetime not null default getdate()
, data float not null);
go
-- create a dummy procedure
create procedure createSomeActivity
as
begin
insert into Activity (data) values (rand());
end
go
-- set up the queue for activation
create queue Timers;
create service Timers on queue Timers ([DEFAULT]);
go
-- the activated procedure
create procedure ActivatedTimers
as
begin
declare @mt sysname, @h uniqueidentifier;
begin transaction;
receive top (1)
@mt = message_type_name
, @h = conversation_handle
from Timers;
if @@rowcount = 0
begin
commit transaction;
return;
end
if @mt in (N'http://schemas.microsoft.com/SQL/ServiceBroker/Error'
, N'http://schemas.microsoft.com/SQL/ServiceBroker/EndDialog')
begin
end conversation @h;
end
else if @mt = N'http://schemas.microsoft.com/SQL/ServiceBroker/DialogTimer'
begin
exec createSomeActivity;
-- set a new timer after 2s
begin conversation timer (@h) timeout = 2;
end
commit
end
go
-- attach the activated procedure to the queue
alter queue Timers with activation (
status = on
, max_queue_readers = 1
, execute as owner
, procedure_name = ActivatedTimers);
go
-- seed a conversation to start activating every 2s
declare @h uniqueidentifier;
begin dialog conversation @h
from service [Timers]
to service N'Timers', N'current database'
with encryption = off;
begin conversation timer (@h) timeout = 1;
-- wait 15 seconds
waitfor delay '00:00:15';
-- end the conversation, will stop activating
end conversation @h;
go
-- check that the procedure executed
select * from Activity;
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