Query on Entity Relationship diagram

StackOverflow https://stackoverflow.com/questions/22996020

  •  01-07-2023
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Question

Below is the ER diagram with relation among 5 different entities.

enter image description here

My question:

1) Each of these 5 entities a class as per OOP terminology?

2) Can you help me understand the meaning of relation(different types of lines) among these 5 entities? Line with a little bubble/ with an angular shape /text

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Solution

This is not an UML diagram at all, but an entity-relationship (E-R) diagram and typically shows the DB design. You can easily google it to find the detailed notstional rules, I could quickly find this page:

http://www.google.de/imgres?imgurl=http://docs.oracle.com/cd/B12037_01/java.101/b12021/img/entity_d.gif&imgrefurl=http://docs.oracle.com/cd/B12037_01/java.101/b12021/dev.htm&h=1780&w=1556&tbnid=vbXfAtrAAIq5_M:&zoom=1&tbnh=97&tbnw=85&usg=__vyr0LMggQHqYtI8Q6Ix-722jJwg=&docid=3LbfUSlxwqfpMM&client=firefox-a&sa=X&ei=iX1HU5awEImN7Qbf6IGwDg&ved=0CEsQ9QEwBA&dur=1439

If you want to model DB in UML, you can still do it, using class diagram and eventually restricting permited relationships to those available in non-OO modelling.

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