relational data language 中文意思是什麼

relational data language 解釋
關系數據語言
  • relational : adj. 有關系的；親戚的；（特指語法上）表示關系的。adv. -ly
  • data : n 1 資料，材料〈此詞系 datum 的復數。但 datum 罕用，一般即以 data 作為集合詞，在口語中往往用單數...
  • language : n 1 語言；（某民族，某國的）國語；語調，措詞。2 （談話者或作者所使用的）言語，語風，文風，文體。3...
  1. We introduce detailly the its design ideal, merit, purpose and sql language and so on, then we discuss the problem of the design and implement of the v - ordbms. compared with other products, now, v - ordbms, which we are designing, is based on the relational database system for windows os, it extends the abstract data type, such as array, set, structure etc, we solve the store and all sorts of sql operation for these extended data type. otherwise, in v - ordbms, we provide the solution of how to realize the store of class, inherit, and the mapping of the relation among classes. etc. it provides the visual environment for using

    對比國外的postgresql ， gemstone ， 02等產品，目前我們設計的v - ordbms原型系統是基於windowsos的平臺，以關系數據庫為基礎，在支持傳統數據類型的基礎上擴展了抽象數據類型adt （ abstractdatatype ） ，例如數組、集合、結構等，解決了它們的存儲以及相應的各種sql操作，能夠支持復雜對象，所以它的數據類型豐富。
  2. Aiming at this problem, the main research issues and achievements in this paper are as follows : bi - directional data transformation between rdb and xml with semantic constraints preserved for most of existing researches on static data transformation between xml and rdb, dtd is taken as the schema description language for xml, and the semantic constraints are often lost during the transformation process. to overcome these disadvantages, the author adopts xml - schema, a standard schema description language proposed by w3c to replace dtd, as the description method owing to its more powerful functions than dtd, and of course with the syntax much more complicated. after analyzing the constraints characteristics in both xml - schema and relational schema, a semantic constraints - preserved algorithm is proposed which can realize the bi - directional schema mapping between rdb and xml through a formalized description of xml based on regular tree and a general expression for relational schema based on direct graph approach

    保留語義約束的xml與rdb雙向靜態數據轉換技術現有研究大多採用dtd （ documenttypedefinition ，文檔類型定義）作為xml的模式描述語言，並且在模式映射過程中丟失語義約束信息，本文分析了xml - schema （ xml - schema採用與dtd完全不同的語法，數據描述能力更強同時也更為復雜，已被w3c確定為替代dtd作為xml模式描述語言的標準）及關系模式的語義約束特徵，通過基於正則樹的xml形式化描述方法以及基於有向圖的一般關系模式表示方法的研究，建立保留語義約束的xml - schema與關系模式的雙向模式映射演算法，實現了xml與rdb的雙向數據轉換，較好地解決了xml與rdb在靜態數據轉換層面的數據集成問題，可有效滿足企業大量rdb數據面向xml的發布以及與日俱增的xml數據存入rdb的應用需求。
  3. Secondly, based on the classification of fuzzy set semantics, we give a new definition on data type. thirdly, by new data types, we give a new fuzzy relational database management system ( frdbs ) database language ( dbl ) and a new quotient operator based on the semantics in fuzzy relational database

    利用模糊集合的語義分類，本文提出了一種新的模糊數據類型劃分方法，在此基礎上提出了一種改進的模糊數據庫語言，並提出了一種基於語義的模糊關系除操作和用於數據類型之間進行轉換的上操作和下操作。
  4. The mapping rule from express data schema to relational databases schema is studied. the translation of the different semantic data types of express into the data definition language of sql is discussed. the persistency of step data in relational databases is realized based on an entity instance manager in working form

    論文對express信息模型到關系數據庫模型的映射規則進行了研究，詳細分析了express語言的不同數據類型到sql數據類型的轉化方法，並對內存實現方式的產品數據倉庫的結構、功能進行了研究，闡述了基於關系數據庫的實體實例索引表的建立方法。
  5. At the same time, we propose a representative data model, i. e. gt data model, and its query language. theoretically, we deeply study the temporal relational algebra and sql - like language based on our ter model, laying a solid theoretic foundation for our accelerator rjf cavity design system

    因此，論文提出了一個概念性數據模型，即時態實體一關系數據模型（ ter模型廠提出了一個表示性數扼模型，即gt數據模型及其查詢語言。
  6. Based on the reference feature of object - relational data model and the query language, the join algorithm sort - loops, probe - loops and segment - join are proposed, their performance are analyzed and compared

    針對對象關系數據模型和查詢語言所支持的引用特性，設計了基於引用的連接演算法sort - loops 、 probe - loops以及segment - join 。
  7. This flexible and portable programming model abstracts the data access layer using an object to relational mapping layer and the enterprise javabean query language ejb - ql

    這個靈活且可移植的編程模型使用對象至關系映射層和enterprise javabean查詢語言（ enterprise javabean query language ， ejb - ql ）抽象了數據訪問層。
  8. The relational data model and use of the sql language allows for enterprise level performance and scalability

    關系數據庫模型和sql語言的使用必須考慮到企業級性能和可伸縮性。
  9. 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

    實現在關系數據庫存取對象，常用的做法有：一種方法是在對象中直接編寫sql代碼來存取對象，另一種方法是將sql代碼在專門的數據類（或存儲過程）中編寫，但著兩種方式都使得對象模型與關系數據庫模式的耦合度大，不容易維護，因為關系數據庫模式的微小改動，都將導致應用程序的重新編譯。
  10. The language used for accessing, querying, updating, and managing data in relational database systems. sql is a widely used database language

    本地變量使用declare @ localvariable語句定義，並使用select或set @ localvariable語句在聲明該變量的語句批處理內分配初始值。
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