It also introduces the BaseEntity and AuditableEntity base classes, from which concrete persistent classes can be extended, depending on whether or not auditing information is required for an object.
还引入了BaseEntity和AuditableEntity基类，可以根据是否需要对象的审计信息，分别从这些基类派生出具体的持久化类。
The Persistent classes aim to make data persistence easy.
persistent类旨在使数据持久性变得简单。
The CPAN Persistent classes are powerful allies in your search for data persistence solutions.
CPANPersistent类是您搜索数据持久性解决方案时的有力帮手。
In the Persistent classes, the datastore is an abstract storage device, which can be a file or a database, for example.
在persistent类中，数据存储器是抽象存储设备，例如，它可以是文件或数据库。
The Persistent classes will automatically create the necessary functions ($equation->answer(), for example) to access the data members.
Persistent类将自动创建必要的函数（例如，$equation->answer()）来访问数据成员。
Any other program that knows the attributes of our objects can use the same datastore (more on this under "Inheriting from Persistent classes").
任何知道对象属性的其它程序都可以使用同样的数据存储器(这方面的详细信息在“从persistent类继承”中)。
Remember that good design and a clear definition of the attributes are just as important as the Persistent classes in achieving successful data persistence.
请记住，在实现成功的数据持久性时，好的设计和属性的清晰定义与Persistent类同等重要。
Remember that good design and a clear definition of the attributes are just as important as the Persistent classes in achieving successful data persistence.
请记住，在实现成功的数据持久性时，好的设计和属性的清晰定义与Persistent类同等重要。
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