(5)查询优化规则:在访问数据库表的数据(Access Data)时,要尽可能避免聚族索引(Clustered Index):聚族索引的数据页按物理有序储存,占用空间小
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现在就得到了单个动态的数据库访问类,它能够让自己适应到数据库中的任何表。
And there you have it: a single dynamic database access class that can bend itself to fit any table in your database.
上述命令将告诉应用程序如何通过用户数据库表名来访问用户模型,以及通过数据库表的列来显示用户名。
This will tell the application how to access your user model by specifying the users db table name and which column to use to display the user name.
其他想要并发访问相同表中的数据的应用程序不需要与数据库断开连接,并且可以继续进行该表中的读或写操作。
Other applications that want to access data in the same table concurrently do not need to disconnect from the database, and are free to pursue read or write operations in that table.
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