在更新触发器中，如果坐标值之一变成null，那么需要删除对应的特性。
In the update trigger, you need to delete the corresponding feature if one of the coordinates becomes null.
更新触发器比较复杂：如果更新导致异常，那么必须删除现有的特性行，就像处理null坐标一样。
The update trigger is more complicated: if the update causes an exception, you have to delete the existing feature row, just as for null coordinates.
向数据库添加触发器，以便对该表中的记录的每个更新都会导致修订计数器递增。
We add a trigger to database so that every update to a record in the table increments the revision counter.
更改会造成触发器或其他自动机制使用与更改相关的信息更新事件库。
The change causes a trigger or another automated mechanism, to update the event store with information about the change.
以数据库为例，可能会使用触发器在更新行之后立即更新更改跟踪表。
In the case of a database, for example, a trigger may be used to update a change tracking table immediately after a row is updated.
Polling活动，基于某种触发器或事件，比如更新外部RDBMS中的数据，来控制一个或多个数据管理活动的执行。
Polling activities, which control the execution of one or more data management activities based on some sort of trigger or event such as an update to data in an external RDBMS.
它们提供了注册、消息传递和补偿触发器逻辑(不是更新反转方法本身)。
They provide registration, messaging, and compensation trigger logic (but not the update-reversal methods themselves).
数据库触发器是驻留在数据库中的程序，当数据库中的表发生更新之类的事件时会运行该触发器。
A database trigger is program residing in the database that runs when an event, such as an update, occurs on a table in the database.
如果在表的xml列上存在XML验证检查约束，在手动更新或者通过触发器更新之前，用户可能需要验证新的xml值。
If an XML validation check constraint exists on the XML column of the table, the user may need to validate the new XML value before the update either manually or by creating a trigger.
因为不能使用触发器来及时更新空间表，所以需要在定期调度机制中使用批量复制机制。
Since triggers are not available to keep the spatial table up to date, you need to use the bulk copy mechanism as part of regularly scheduled mechanism.
触发器并不像参照完整性约束和检查约束那样，我们甚至可以使用对其他表来进行更新。
Triggers, unlike referential and check constraints, can even be used to update other tables.
为了确保日期时间戳或版本号的准确性，您需要在表上设置触发器，以便在发生对行的更改时，对日期时间戳或版本号进行更新。
To keep the date-time stamp or version number accurate, you need to set up a trigger on the table to update it when a change to a row occurs.
本文介绍了一种通过增加触发器来模拟主外键，实现级联更新功能的方法。
The article shows one solution that we add triggers to simulate the primary key and foreign key, and then realize cascade update.
在更新主表的时候会把旧数据推入历史表中，这个过程一般是通过触发器或由应用程序自己来完成。
Updates made to the main table result in actions that push out the previous values of data to the history tables. This is either done through triggers or by the applications themselves.
我知道的唯一途径使乌鸦及时与SQL数据库中的数据将从SQL运行一系列的触发器和更新相应的乌鸦。
The only way I known to keep raven up to date with data in a SQL database would be to run a series of triggers from SQL and update raven accordingly.
触发器可以设置为实时更新统计结果。系统通过调用带有统计触发器的子程序来执行实时更新动作。
Real-time update is done by calling a subprogram with the statistical trigger code as an argument.
触发器可以设置为实时更新统计结果。系统通过调用带有统计触发器的子程序来执行实时更新动作。
Real-time update is done by calling a subprogram with the statistical trigger code as an argument.
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