You can use a SIGNAL statement to raise an error condition if the business rule defined in your trigger is violated.

如果违反了您在触发器中定义的业务规则，就可以使用signal语句来抛出一个错误条件信号。

youdao

The presentation module would trigger a rule or a set of rules based on the current active page in the application and adapt the navigational links of that page to the user based on such rules.

表示层模型将会基于应用程序内的当前活动页面触发一个规则或一组规则，并将基于这些规则针对此用户相应调整该页面的导航链接。

youdao

A presentation module would trigger a rule, or a set of rules, based on the current page and adapt the contents to comply with the rules associated with the page.

表示模块应该基于当前页面触发一个规则或一组规则，并应相应调整这些内容以便遵从与此页面相关的规则。

youdao

There is no hard-and-fast decision rule or trigger mechanism to which he or she must adhere in deciding whether supply conditions in the oil market justify an intervention.

FORBES: Will Obama Pull The Trigger On The Strategic Petroleum Reserve?

Still, it should have been fairly obvious that this rule was going to trigger the inevitable firestorm, particularly when the leadership of the Catholic Church has been warning for months that they were not going to let this one go by without a fight.

FORBES: Memo To Obama Administration: It's Tough Enough Out There Without Unforced Errors Like The Contraception Bruhaha

If margin rule changes for a minor commodity can trigger a general price run, imagine what would happen if a series of broad based rule changes were implemented.

FORBES: Fed Has Power To Pop Commodity Bubble