检测 Microsoft Access 数据库表的上次更改时间
有谁知道一种方法来检测 Microsoft Access 表上次更改（插入或更新）的时间？ 我们通过 ADO COM 使用 OLEDB 以编程方式与访问数据库进行通信，并正在寻找一种检测特定表更改的方法。 我们不需要知道这些改变是什么，只需要知道发生了什么改变。
Does anyone know of a way to detect when the last time a Microsoft Access table has been changed (inserted into or updated)? We used OLEDB via ADO COM to communicate with an access database programmatically and were looking for a way of detecting changes to specific tables. We don't need to know what those changes are, just that changes were made.
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检测表中的数据是否已更改的唯一方法是对表执行查询。
您必须向表中添加一个
DATETIME类型的列，例如名为LastUpdatedDate的列，该列指示每行的上次更新日期/时间。 将其设为NOT NULL，以便您必须为每个INSERT或UPDATE向该列写入更新的DATETIME值>。 另外，将该列设置为当前日期戳的默认值DATE()或当前日期/时间戳的默认值NOW()。 然后添加验证规则或CHECK约束，例如CHECK (LastUpdatedDate = NOW())以确保该列在每次UPDATE和 <代码>插入。最后，运行
MAX(LastUpdatedDate)查询，您将获得所需的结果。The only way to detect if data in the table has changed is to perform a query against the table.
You must add a column of type
DATETIMEto the table e.g. namedLastUpdatedDatethat indicates the last updated date/time of each row. Make itNOT NULLso that you will have to write an updatedDATETIMEvalue to that column for eachINSERTorUPDATE. Also, set the column to have a default ofDATE()for the current date stamp orNOW()for the current date/time stamp. Then add a Validation Rule orCHECKconstraint e.g.CHECK (LastUpdatedDate = NOW())to ensure the column is actually updated on eachUPDATEandINSERT.Finally, run a
MAX(LastUpdatedDate)query and you will get what you need.每次访问表时，没有办法不“手动”写入列。
There isn't a way without "manually" writing to a column each time you access the table.
正如其他人所指出的，如果不自己编码，就无法跟踪更改。
有一个简单的例子
ACC2000：如何在表单中创建记录更改的审计跟踪
http://support.microsoft.com/default.aspx? scid=kb;en-us;Q197592
审核跟踪 - 在记录级别记录更改：
http://allenbrowne.com/AppAudit.html
本文讨论了表单和子表单的编辑、插入和删除。
模块：维护变更历史记录
http://www.mvps.org/access/modules/mdl0021.htm
历史表例程旨在写入历史记录，跟踪对一个或多个表中的字段所做的更改。
As others have indicated there is no way to track changes without coding it yourself.
There's a simple example at
ACC2000: How to Create an Audit Trail of Record Changes in a Form
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q197592
Audit Trail - Log changes at the record level at:
http://allenbrowne.com/AppAudit.html
The article addresses edits, inserts, and deletes for a form and subform.
Modules: Maintain a history of changes
http://www.mvps.org/access/modules/mdl0021.htm
The History Table routine is designed to write history records that track the changes made to fields in one or more tables.
您将需要在表中实现时间戳列，并在数据更改期间更新该值。
You will need to implement a timestamp column in your table, and update the value during your data changes.