relational model of database 中文意思是什麼

relational model of database 解釋
關系數據庫模型
  • relational : adj. 有關系的；親戚的；（特指語法上）表示關系的。adv. -ly
  • model : n 1 模型，雛型；原型；設計圖；模範；（畫家、雕刻家的）模特兒；樣板。2 典型，模範。3 （女服裝店僱...
  • of : OF ＝Old French 古法語。
  1. Third, this dissertation analyzes the complicacy of result size estimation problem for xml structure based query optimization compared to its counterpart in traditionally relational database, and proposes a full - featured result size estimation algorithm for xml query, sxm. for simple path expression query, this dissertation proposes a dynamic synopsis model for xml data based on the concept of f - stable and b - stable, xmap. for complicated path expression query, this dissertation adopts an improved bifocal sampling method for result size estimation

    第三，分析了xml結構化查詢優化中的查詢代價估計問題與傳統關系型數據庫中的查詢代價估計問題的區別，提出了一套完整的xml結構化查詢代價估計體系sxm ，包括對簡單路徑表達進行查詢代價估計的動態xml數據統計模型xmap ，對復雜路徑表達進行查詢代價估計的雙焦點例舉法，以及對值匹配條件進行查詢代價估計的基於小波的多維直方圖方法，並能將多種查詢表達的查詢代價估計結果結合在一起，以給出一個完整的xpath查詢的代價估計。
  2. Involuntarily, questions of these engineering datas " management appear, datas " persistance only depending relational model and rdbms is greatly insufficient, so this paper carefully studies object - relational mapping based on rdbms based on the analyse of home & overseas actualities, correlative theories and realizing methods of object - relational mapping, we find opl based on rdbms is the most suitable for object relatinoal mapping of clera. based on the engineering application analyse of opl in clera, function requirements, database modes, interface criterions and functions, running modes of opl have being detailedly described. with the framework of microsoft dna, a kind of realizing method of opl based on com / dcom / activex component technology has being brought forward, and this paper describes realizing keys from base tables " definition, object id and class hx class and inheritance of class, object storage, parallel control and affair, object query, object nesting, relations between objects, support of complex data types, right control of object and buffer management of object

    本文在分析對象?關系映射技術的國內外現狀、相關理論及實現方法的基礎上，研究發現基於rdbms的opl是目前最適合clera的對象?關系映射方法；在clera的opl應用分析的基礎上，詳細描述了opl的功能要求、數據庫模式、介面規范與功能、運行方式等內容；結合microsoftdna開發框架，提出了一種基於com dcom activex組件技術的opl實現思路，並從基本表定義、對象標識與類標識、類與類繼承、對象存儲、並發控制與事務、對象查詢、對象嵌套、對象間聯系、復雜數據類型的支持、對象級權限控制及對象緩沖管理等幾方面概述了實現要點。
  3. As the rdbms ( relational database system ) can hardly adapt the requirement of non - traditional application, such as incompetence of model representation, low system with a combination of 00 language, sematic, model, complex object and database system. it absorts the merit of the oodbms and the rdbms, it inherit the mature technology of the rdbms, on the other hand, it import the technology of the 00, so it can boost up the ability of handle complex object, etc

    它針對關系數據庫系統（ rdbms ）不能適應非傳統應用的要求，如：模型表達能力有限，系統效率低、事務模型太簡單等，結合面向對象語言、語義模型、復雜對象模型和數據庫的幾個方面的研究而形成的一個高度數據集成化系統。
  4. In the 1970s, the rigorous mathematical work of e. f. codd and others created the now - ubiquitous relational database model

    70年代， e . f . codd與其他一些人通過嚴格的數學工作創造了現在無處不在的關系數據庫模型。
  5. The content of this paper mainly includes investigation content and methods of electronic multi - media military geographic documentations, the data model of multi - media database ( the object - oriented multi - media data model, the extended relational data model, the hyper - text multi - media model ), the general and detailed design for multi - media database and the connecting technique between foreground application and background database, which includes odbc, mfc odbc, dao, ole db and ado

    本文的主要內容包括多媒體電子兵要地誌的研究內容和方法；多媒體數據庫數據模型（面向對象的多媒體數據模型、擴充的關系數據模型、超文本的多媒體數據模型和融合型數據模型） ；多媒體數據庫的總體設計和詳細設計；前臺應用程序與后臺數據庫的多種連接技術，包括odbc 、 mfcodbc 、 dao 、 oledb和ado技術。
  6. To manage data storage, many database management system are now available, like oracle, ms sqlserver, db2, infomix, sybase and mysql etc. these systems are all based on the theory of relational data model, and can provide us with strong functions on data storage management

    在數據的存儲方面，有oracle ， mssqlserver ， db2 ， informix ， sybase ， mysql等成熟的數據庫服務器產品提供比較完善的功能。這些建立在關系數據理論上的產品無論是在功能、效率還是安全等方面可以說完全能夠滿足現有數據存儲的需要。
  7. While xml enthusiasts have begun to see everything in the world encoded with xml tags, the relational database model is entrenched and most of the world s digital data is encoded in tables that are composed of rows and fields

    雖然xml的狂熱者可能將世界上的一切都看成是用xml標簽編碼的，單關系數據庫模型仍然根深蒂固，世界上大部分數字數據是用由行和列組成的表來進行編碼的。
  8. In this paper, the original extended relational model has been improved by adopting mfm in the research of incomplete information database

    本文將三值邏輯謂詞演算系統mf ~ m應用在不完全信息數據庫的研究中，對原有的擴充關系模型做了改進。
  9. Based on field investigation of pavement conditions in the 2nd phase of guangbei section of national highway 108 ( beijing to kunming ), an e - r ( entity - relational ) model database was developed to help organize the numerous data measured in the real road

    通過國道108線廣元段廣北二期工程路面狀況的實地考察，建立了一個e ? r關系數據庫存儲路面狀況信息。
  10. The thesis has implemented the datatype model of the air transportation information system database with the objected - oriented relational database oracle9i using the structured query language, loaded the air transportation information into the database and built the view of the database considering the needs of the application

    本文應用面向對象的大型關系數據庫產品oracle9i建立了空中交通管理信息數據庫的數據模型，將空中交通信息導入空中交通管理信息數據庫，同時根據數據庫應用開發的需要建立了應用開發視圖。
  11. In this paper, a discussion of construction of the knowledge base by the relational model is presented. we analyze the knowledge into groups, each one called a knowledge point. then, use rm to organize the knowledge points to form two databases ; one is called the attribute database, and the other called linkage database

    同時教學系統還必需具有大量多媒體數據的管理能力，學科知識庫與教學材料庫結合也是一個重要問題。本文使用關系模型討論建立學科知識庫的方法。首先把學科知識分解為知識點，用關系模型來組織知識點，形成知識點屬性庫和鏈接庫。
  12. The organization of data : first, the author introduced the data structure of maplnfo and studied file structures of the data and the mechanism of connection ( especially the connection of graph & data ). then, the author works out the model of the data ' s structure of this system and set up database of classifying land that based on the model of relational database

    數據組織：首先簡要介紹了mapinfo的數據組織結構，研究了構成mapinfo的數據文件結構及連接機制（特別是圖?數連接機制） ；然後在此基礎上設計出系統的數據組織模式，建立了基於關系數據庫模型的土地分類數據庫。
  13. Paraconsistent database, which based on 4 - valued paraconsistent logic and relational data model, can effective manipulate two kinds of uncertain information

    但以次協調邏輯與關系數據模型相結合而產生的次協調數據庫能夠有效地處理這兩類不確定信息。
  14. This course is designed to introduce graduate students to the foundations of database systems, focusing on basics such as the relational algebra and data model, query optimization, query processing, and transactions

    課程描述本課程設計的目的是給研究生介紹數據庫的基礎知識，關注于基礎，如關系代數和數據模型，查詢優化、查詢處理和事務。
  15. Firstly we introduced research background and theory foundation. data characteristics of half structure and xml and cscw are simply introduced ; very important critical technology of cooperation work : transform between xml and the relational database is researched deeply secondly. the emphatic questions such as principle and thought are expatiated, and a general transformation rule and realization such as the data abstract, integration and transform are put forward ; as well as we introduced data binding in java environment, and put forward a datachange model which works in cooperation work

    本文首先介紹研究的背景和理論基礎，對xml 、 cscw技術和web的半結構化數據特點做了簡單介紹；接著對數據庫協同工作中的關鍵技術： xml與關系數據庫之間的相互轉換進行了深入的研究，闡述了轉換過程中的原理、思想精髓等重點問題，提出了通用的轉換規則，以及在web數據庫中數據的提取、集成、轉換等實現技術；同時還介紹了在java環境下數據綁定的過程，並提出一個協同數據庫管理系統的模型datachange 。
  16. In the past 30 years, the database system has already developed the no relational model, the next generation object - relational database system ( ordbs ), the third generation object oriented database system ( oodbs ). in the 1990s later, for the speed of the internet technique, the website base based on the internet promoted the information resource share

    經過30年的發展，數據庫系統已經歷了第一非關系型數據庫、第二代關系型數據庫（ ordbs ）的發展到面向對象數據庫系統（ oodbs ）和各種專業數據庫。九十年代後由于網際網路絡技術的飛速發展，基於網際網路的網站數據庫技術為信息資源的共享提供了技術上的保障。
  17. Chapter 2 introduction to the technology of workflow is presented first it is described in detail from the aspects of conception, reference model and the current status and development, and then a workflow management system which is based on the relational database and developed for the web application is analyzed through the presentations of flow definition, engineer, tasks assigning and wapi

    第二章，對工作流相關概念、參考模型、工作流技術的現狀和發展等方面研究的基礎上，開發了一個基於關系結構的工作流管理系統，並從工作流模型定義、工作流引擎、任務指派、用戶介面等各方面全面描述。
  18. Generally, the research of knowledge discovery is based on relational database, database reduction algorithm based on relational database directly obtains core of database, attributes reduction and rule reduction by operator in relational database. it is a simple and effective. essentially, rough relational database model in this paper, which extending classical rough sets model, is a multi - valued information system

    知識發現研究的實施對象多為關系數據庫，基於關系數據庫操作的數據庫約簡演算法利用關系數據庫的操作運算元直接對數據庫進行求核、屬性約簡和規則約簡，該方法充分發揮數據庫操作的簡便高效性，使得數據庫約簡演算法簡單易實現。
  19. The history of the development of database technology can be divided into three phases : the first generation is the reticulation / hierarchical data model based on database ; the second generation is the relational data model based database ; the third generation database which has the object oriented character breakthroughs the localization of the traditional database model which is unable to build model based on complex data structure. the third generation has led the database system to a new time

    數據庫技術的發展經歷了三個階段：第一代數據庫系統是基於網狀、層狀數據模型的網狀、層狀數據庫管理系統；第二代數據庫是基於平面關系模型的關系數據庫系統；以面向對象模型為代表的第三代數據庫系統突破了傳統數據模型在復雜數據建模和管理方面存在的局限性，使數據庫系統進入了新的時代。
  20. Secondly, we study on how to build the object model for the system utilizing object - oriented technique in the system implement and the process of the mapping from object model to the relational database model in order to build the model of the relational database for the system

    接著，研究了利用面向對象技術建立系統對象模型的方法，以及對象模型向關系數據庫的映射過程，進而建立了系統的信息模型。
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