因为在示例代码中通常省略了错误检查，即便如此，这仍是将数据保存到文件中的快速简单的方法。
As is usual in example code, error checking has been omitted, but even so, this is a quick and easy way of saving data to file.
如果数据库具有验证代码，这些代码要求在保存文档之前，各个字段都必须填写完整，并且如果还未填写完整就试图保存文档会产生各种错误，该怎么办？
What if your database has some validation code that requires various fields to be filled before the document can be saved, and will produce all sorts of errors if you try to save before that?
如果邮件数据库设置了警告门限，当用户打开数据库或者试图保存草稿或新的已发送消息时，会显示以下的错误。
When mail databases have a warning threshold set, the following error displays when the database is opened or the user tries to save a draft or new sent message.
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