This data access object is extremely simple; it does not connect to any external resources (such as relational databases) to obtain Test instances.
该数据访问对象极其简单；它不连接任何外部资源(比如关系数据库)以获得Test实例。
This information is often required by other Relational DAS instances and is, therefore, a candidate for placing in a separate script and then included.
此信息通常是其他关系型DAS实例所需的，因此，它是一个候选信息，用于填入单独的脚本然后包括其中。
There are also instances when a given bean class with all the required relational mapping meta-data exists, but the underlying physical tables to which it is mapped are missing.
有时候，已经存在一个bean类，其中包含所有需要的关系映射元数据，但是这个类所映射的底层物理表却丢失了。
In the case where only FDs are concerned, decompositions of relational schema are examined with diagrams. The relationship between database instances and universal relations is also investigated.
在函数依赖情况下，用图示方法分析关系模式的分解情况，探讨数据库实例和泛关系的联系。
In the case where only FDs are concerned, decompositions of relational schema are examined with diagrams. The relationship between database instances and universal relations is also investigated.
在函数依赖情况下，用图示方法分析关系模式的分解情况，探讨数据库实例和泛关系的联系。
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