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(guān)系映射技術(shù)的國內(nèi)外現(xiàn)狀、相關(guān)理論及實現(xiàn)方法的基礎上,研究發(fā)現(xiàn)基于rdbms的opl是目前最適合clera的對象?關(guān)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(shù)據(jù)庫模式、接口規(guī)范與功能、運行方式等內(nèi)容;結(jié)合microsoftdna開發(fā)框架,提出了一種基于comdcomactivex組件技術(shù)的opl實現(xiàn)思路,并從基本表定義、對象標識與類標識、類與類繼承、對象存儲、并發(fā)控制與事務、對象查詢、對象嵌套、對象間聯(lián)系、復雜數(shù)據(jù)類型的支持、對象級權(quán)限控制及對象緩沖管理等幾方面概述了實現(xiàn)要點。
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(guān)系映射技術(shù)的國內(nèi)外現(xiàn)狀、相關(guān)理論及實現(xiàn)方法的基礎上,研究發(fā)現(xiàn)基于rdbms的opl是目前最適合clera的對象?關(guān)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(shù)據(jù)庫模式、接口規(guī)范與功能、運行方式等內(nèi)容;結(jié)合microsoftdna開發(fā)框架,提出了一種基于comdcomactivex組件技術(shù)的opl實現(xiàn)思路,并從基本表定義、對象標識與類標識、類與類繼承、對象存儲、并發(fā)控制與事務、對象查詢、對象嵌套、對象間聯(lián)系、復雜數(shù)據(jù)類型的支持、對象級權(quán)限控制及對象緩沖管理等幾方面概述了實現(xiàn)要點。