enhance:增加使用JPA实体定义文章。

drawings/spring-jpa-example-er.puml

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+@startuml example-er
+!include ./class-settings.puml
+hide empty members
+
+entity "Grade" as g {
+  * id : varchar(200)
+  --
+  * created_at : datetime
+  modified_at : datetime
+  deleted_at : datetime
+  * name : varchar(50)
+  * year : varchar(5)
+  * chief_teacher : varchar(200) <<FK>>
+}
+
+entity "Class" as cl {
+  * id : varchar(200)
+  --
+  * created_at : datetime
+  modified_at : datetime
+  deleted_at : datetime
+  * name : varchar(50)
+  * grade_id : varchar <<FK>>
+  * type : varchar(3)
+  * chief_teacher : varchar(200) <<FK>>
+}
+
+entity "Member" as m {
+  * id : varchar(200)
+  --
+  * created_at : datetime
+  modified_at : datetime
+  deleted_at : datetime
+  disabled_at : datetime
+  * name : varchar(50)
+  * role : varchar(3)
+  * username : varchar(50)
+  * password : varchar(200)
+}
+
+entity "Teacher" as t <role="tea"> {
+  * subject_id : varchar(200) <<FK>>
+}
+
+entity "Student" as st <role="stu">
+
+entity "Teacher_Detail" as td {
+  * teacher_id : varchar(200)
+  --
+  sex : varchar(3)
+  birth : date
+  entry_time : date
+  phone : varchar(20)
+}
+
+entity "Student_Detail" as std {
+  * student_id : varchar(200)
+  --
+  sex : varchar(3)
+  birth : date
+  enrolled_at : date
+  graduated_at : date
+  guardian_name : varchar(50)
+  guardian_phone : varchar(20)
+}
+
+entity "Class_Student" as cls {
+  * class_id : varchar(200) <<FK>>
+  * student_id : varchar(200) <<FK>>
+}
+
+entity "Subject" as su {
+  * id : varchar(200)
+  --
+  name : varchar(50)
+}
+
+entity "Work" as w {
+  * id : varchar(200)
+  --
+  *created_at : datetime
+  modified_at : datetime
+  deleted_at : datetime
+  * published_at : datetime
+  * published_by : varchar(200) <<FK>>
+  * subject : varchar(200) <<FK>>
+}
+
+entity "Class_Work" as cw {
+  * class_id : varchar(200) <<FK>>
+  * work_id : varchar(200) <<FK>>
+}
+
+entity "Work_Record" as wr {
+  * work_id : varchar(200) <<FK>>
+  * student_id : varchar(200) <<FK>>
+  --
+  * created_at : datetime
+  modified_at : datetime
+}
+
+m <|-- t
+m <|-- st
+g --|| t
+t ||- cl
+g ||--|{ cl
+su ||-o{ w
+t ||--o{ w
+cl ||--o{ cw
+w ||-|| cw
+su ||-o{ t
+cl ||--o{ cls
+st ||--o{ cls
+w ||--o{ wr
+st ||---o{ wr
+td ||--t
+std ||--st
+@enduml