Entity Relationship Diagram
From Open Risk Manual
Definition
A Entity-Relationship Diagram (or E-R Diagram or Model) is a structural diagram that describes interrelated things of interest in a specific domain of knowledge. An E-R Diagram is composed of entity types (which identify the things of interest) and relationships that can exist between entities (instances of those entity types).
Entity-relationship modeling was developed for database design. It is most closely related to a Class Diagram. It does not define the Business Process it presents a business data schema in graphical form.
PlantUML Elements
A PlantUML components diagram specifies and shows the following:
- Entities
- Relations
Example
@startuml
skinparam handwritten true
hide circle
skinparam linetype ortho
entity "Entity01" as e01 {
* e1_id : number <<generated>>
--
* name : text
description : text
}
entity "Entity02" as e02 {
* e2_id : number <<generated>>
--
* e1_id : number <<FK>>
other_details : text
}
entity "Entity03" as e03 {
* e3_id : number <<generated>>
--
e1_id : number <<FK>>
other_details : text
}
e01 ||..o{ e02
e01 |o..o{ e03
@enduml
