在内部，类负责维护所汇聚的全部对象的哈希表。
Internally, the class maintains a hash table of all pooled objects.
通常，当我们获取保存其它对象的对象时，我们并不关心其中的全部对象。
Often when we are getting an object that holds other objects, we're not concerned with all of them.
为数据库对象编写命名协议的目的，就是能够轻松的定义数据库中全部对象。
The main goal of adopting a naming convention for database objects is so that you and others can easily identify the type and purpose of all objects contained in the database.
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