Abstract : taking verification information management system of hardness specimen as an example , a method of realizing concept design and realization design of data - base by e - r method ( entity - relationship approach ) is introduced 文摘:以硬度塊檢定信息管理系統(tǒng)的設(shè)計(jì)為例,介紹了一種用e - r方法(實(shí)體-聯(lián)系方法)實(shí)現(xiàn)數(shù)據(jù)庫的概念設(shè)計(jì)、實(shí)現(xiàn)設(shè)計(jì)的方法。