mermaid diagrams

Author: christiannagel

2_Libs/EFCore/Diagrams.md

@@ -0,0 +1,247 @@
+# Diagrams
+
+## Models
+
+
+### Owned Entities
+
+```mermaid
+classDiagram
+   Address *-- Location : Location
+   Person *-- Address : BusinessAddress
+   Person o-- Address : PrivateAddress
+   
+   class Location {
+     +Country: string
+     +City: string
+   }
+   class Address {
+     +LineOne: string
+     +LineTwo: string
+   }
+   class Person {
+     +PersonId: int
+     +FirstName: string
+     +LastName: string
+   }
+```
+
+```mermaid
+erDiagram
+  People {
+    int PersonId
+    string FirstName
+    string LastName
+    string BusinessAdressLineOne
+    string BusinessAddressLineTwo
+    string BusinessCity
+    string BusinessCountry
+    int PrivateAddressId
+  }
+  PrivateAddresses {
+    string LineOne
+    string LineTwo
+    string City
+    string Country
+  }
+```
+
+### Table Splitting
+
+```mermaid
+classDiagram
+
+   MenuItem "1" o--> "1" MenuDetails : Details
+   
+   class MenuDetails {
+     +MenuItemId: int
+     +KitchenInfo: string
+     +MenusSold: int
+   }
+   class MenuItem {
+     +MenuItemId: int
+     +Title: string
+     +Subtitle: string
+     +Price: decimal
+   }
+```
+
+```mermaid
+erDiagram
+  MenuItem {
+    int MenuItemId
+    string Title
+    string Subtitle
+    money Price
+    string KitchenInfo
+    int MenusSold
+  }
+```
+
+
+## 
+
+```mermaid
+classDiagram
+
+   MenuItem "1" o--> "1" MenuDetails : Details
+   
+   class MenuDetails {
+     +MenuDetailsId: int
+     +KitchenInfo: string
+     +MenusSold: string
+     +Price: decimal
+   }
+   class MenuItem {
+     +MenuItemId: int
+     +Title: string
+     +Subtitle: string
+     +Price: decimal
+   }
+   class MenuCard {
+     +MenuCardId: int
+     +Title: string
+   }
+   class Restaurant {
+     +Name: string
+   }
+```
+
+## Inheritance
+
+## Table per Hierarchy (TPH)
+
+TPH is a pattern where you have a base class and multiple derived classes. Each derived class has its own table. The base class table contains a discriminator column that identifies the type of the derived class. The derived class tables contain all the columns of the base class table plus their own columns.
+
+```mermaid
+classDiagram
+
+    Payment <|-- CashPayment
+    Payment <|-- CreditcardPayment
+    class Payment {
+        +PaymentId: int
+        +Name: string
+        +Amount: decimal
+    }
+    
+    class CashPayment {
+    }
+    
+    class CreditcardPayment {
+        +CreditcardNumber: string
+    }
+```
+
+```mermaid
+erDiagram
+  Payments {
+    int PaymentId
+    string PaymentType
+    string Name
+    money Amount
+    string CreditcardNumber
+  }
+```
+
+## Table per Type (TpT)
+
+Table per type
+
+```mermaid
+erDiagram
+  Payments {
+    int PaymentId
+    string PaymentType
+    string Name
+    money Amount
+
+  }
+
+  CashPayments {
+    int PaymentId
+  }
+
+  CreditcardPayments {
+    int PaymentId
+    string CreditcardNumber
+  }
+```
+
+## Table per concrete Type (TcT)
+
+```mermaid
+classDiagram
+
+  Payment <|-- CashPayment
+  Payment <|-- CreditcardPayment
+        
+  class Payment {
+    <<abstract>>
+    +PaymentId: int
+    +Name: string
+    +Amount: decimal
+  }
+        
+  class CashPayment {
+  }
+        
+  class CreditcardPayment {
+    +CreditcardNumber: string
+  }
+```
+    
+
+```mermaid
+erDiagram
+  CashPayments {
+    int PaymentId
+    string Name
+    money Amount
+  }
+
+  CreditcardPayments {
+    int PaymentId
+    string Name
+    money Amount
+    string CreditcardNumber
+  }
+```
+
+## Many-to-many Relationships
+
+```mermaid
+classDiagram
+  Book "*" <--> "*" Person
+        
+  class Book {
+    +BookId: int
+    +Title: string
+    +Publisher: string
+  }
+        
+  class Person {
+    +PersonId: int
+    +FirstName: string
+    +LastName: string
+  }
+```
+
+```mermaid
+erDiagram
+  Books {
+    int BookId
+    string Title
+    string Publisher
+  }
+
+  People {
+    int PersonId
+    string FirstName
+    string LastName
+  }
+
+  BookPeople {
+    int BookId
+    int PersonId
+  }
+```