January 2021
Intermediate to advanced
505 pages
9h 45m
Chinese
Content preview from PHP编程：第4版
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240
｜
第
9
章
数据库
图9-5：简单的Mongo文件数据
正如你在图
9-5
中看到的，插入数据会创建一个名为
_id
的实体。这是所有创建的集合
的自动主键。如果想依靠这个键——没原因不这样做（除了它明显的复杂性）——在上
面代码中并不需要在
authorid
信息中增加它。
检索数据
一旦数据被存储，我们就可以开始寻找方法来访问它。示例
9-9
中的代码显示了一种方法。
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