The research of security mechanism for active network 具有特殊属性的关系数据库模式的研究与实现
To represent a relational database schema that is mapped to an ejb design 的xml文件来表示映射到ejb设计的关系数据库模式。
Elements in the ejb dd should be mapped to the fields in the relational database schema 元素应如何映射到关系数据库模式中的字段。
So why were the relational database schema center and so many other database - related plug - ins activated 而为什么关系数据库模式中心( 6 )和那么多其他数据库相关的插件被激活了?
Whereas most orm solutions map a class to a relational database schema , hybrid frameworks like ibatis map classes to the result of an sql query 大多数的orm解决方案把一个类映射到一个关系数据库模式,而诸如ibatis之类的混合框架则把类映射到一个sql查询的结果。
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。