关系数据库模式 meaning in English
relational data base schema
relational database schema
relationaldatabaseschema
relative database schema
Examples
- 11 sudha ram , jinsoo park . semantic conflict resolution ontology scrol : an ontology for detecting and resolving data and schema level semantic conflicts . ieee trans
然后我们使用owl语言建立关系数据库模式的语义扩展模型esm extended semantic model ，以利用冲突分类本体sco解决语义冲突。 - Then we provide a system of axiom based on class level , some algorithms about how to transform class level to database model , three aproches of how to realize properly inheritance in class level
然后在现有rdbms坚实的理论基础上，对新一代的ordbms创新性地提出了基于类层次的公理系统、变换规则，并给出了基于关系模式的类层次向关系数据库模式转换的基本算法。 - To persistence the objects there are two common approach . one approach is that structured query language ( sql ) codeis embedded in the source code of your classes . the other approach is that sql statements for your business classes are encapsulated in one or more " data classes . " the disadvantage is that it directly couples your business classes with the schema of your relational database , implying that a simple change such as renaming a column or porting to another database results in a rework of your source code
实现在关系数据库存取对象,常用的做法有：一种方法是在对象中直接编写sql代码来存取对象，另一种方法是将sql代码在专门的数据类（或存储过程）中编写，但着两种方式都使得对象模型与关系数据库模式的耦合度大，不容易维护，因为关系数据库模式的微小改动，都将导致应用程序的重新编译。 - Secondly , a database - populating mechanism is built , along with some object - manipulating operations needed for flexible database design , to support data extraction from huge text stream . thirdly , top - down and bottom - up strategies are combined to design a new extraction algorithm that can extract data from data sources with optional , unordered , nested , and or noisy components
本文采用关系数据库来组装抽取对象，给出了将任何ere de -树映射成关系数据库模式的算法，这一数据库映射机制不仅能够支持海量文本流的数据抽取，还支持合并键定义等抽取对象控制操作，可实现灵活的数据库模式设计和数据抽取。