排序方式： 共有1条查询结果，搜索用时 15 毫秒
1
1.
The traditional E-R's model can abstract the real world strongly, but the relationship among entities in E-R's model is very mixed and disorderly .In order to improve the productivity of the module of data input,the layered E-R model based input technology is presented. The logic model( relational model) produced by the traditional E-R model is layered by primary keys. According to the layered model ,the input interface is produced .First the input interface of 1th-tier entity is produced .By using the input interface of 1th-tier entity ,the input interface of 2rd-tier entity is produced ,until the input interface of the last tier is produced. 相似文献
1