The concept of inheritance throws in several interesting twists when saving objects into a relational database.
在将对象保存到关系数据库中时，继承的概念中发生几个有趣的问题。
Data access objects are responsible for operating on objects that hold data stored in a relational database.
数据访问对象负责对持有数据(存储在关系数据库中)的对象进行操作。
Again, just like relational database management systems (RDBMS), objects and RDF are similar in some ways and different in others.
另外，像关系数据库管理系统（RDBMS）一样，对象和RDF在一些方面相似而在其他方面不同。
Now for the other big difference between the ZODB and a relational database: ZODB objects completely lack any schema specification.
下面讨论一下ZODB和关系数据库之间的其他主要区别：ZODB对象完全缺乏任何模式规范。
In a relational databases, objects that can't be represented as records of basic data values must be assembled through database joins.
在关系数据库中，无法表示为基本数据值的记录的对象必须通过数据库联结进行组装。
In such a design, updates are applied to objects and it is the responsibility of the mapping layer to migrate those changes to a relational database.
在这样的设计中，更新被应用到了对象上，映射层的职责就是将这种变化反映到关系数据库中。
ECO can use any relational database to persist objects, but it is especially well-suited to IBM DB2 UDB.
ECO可以使用任何关系数据库来存储对象，但特别适合使用IBMDB 2UDB。
Structured Query language (SQL) : a standardized language used to define objects and manipulate data in a relational database.
结构化查询语言(Structured Query Language,SQL)：一种标准化语言，用于在关系数据库中定义对象及操纵数据。
The query syntax is object oriented and there is no concept of tables, indices, or other typical relational-database concepts. For example, the following query returns all StockBean objects in a list.
查询语法是面向对象的，并且没有了表、索引或其他典型的对象关系型数据库的概念。
IBM Database Add-ins for Visual Studio allows the creation of data-bound XAML applications that map directly to relational objects in IBM data servers.
IBMDatabaseAdd - ins forVisualStudio允许用户创建直接映射到IBM数据服务器中的关系对象的数据绑定XAML应用程序。
Create a DB2 Viper database (to support relational and XML data objects).
创建一个DB 2Viper数据库(以支持关系和XML数据对象)。
An application that USES a relational database has many such objects, like connections, statements, result sets, and so on.
一个数据库相关的应用程序有许多这样的对象，如连接、语句、结果集等等。
Once the mapping is done, you can manipulate mapped objects as normal objects and easily submit changes back to relational database without writing complex data access logic.
一旦完成映射，您就可以将他们当成普通对象来处理，无需编写复杂的数据访问逻辑就可以轻松地将更改提交回数据库。
On the other hand, a physical data model is a database-specific model that represents relational data objects (for example, tables, columns, primary and foreign keys, and their relationships).
另一方面，物理数据模型是数据库特定的模型，它代表关系数据对象，例如表、列、主键、外键以及它们的关系。
Plan the relational design of the database objects and the storage characteristics for each of these objects.
计划的相关设计包括；数据库对象和每个对象的存储特征。
First accessing a relational database (for creating these objects) can be very time expensive.
首先存取一个关系数据库(为了创建这些对象)时间开销很大。
Since most applications are associated with relational database, it becomes an important problem to map objects into relational database.
目前的许多应用软件与传统的关系型数据库联系在一起。
Since most applications are associated with relational database, it becomes an important problem to map objects into relational database.
目前的许多应用软件与传统的关系型数据库联系在一起。
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