Диаграмма деятельности — CRUD Workshop

Диаграмма

graph TD
    Start[Start] --> Select[Select action]
    Select --> Action{Action}
    
    Action -->|Create| Enter[Enter workshop data]
    Enter --> Validate{Validate}
    Validate -->|OK| Insert[INSERT into DB]
    Validate -->|Error| Enter
    Insert --> Select
    
    Action -->|Read| Choose[Choose workshop]
    Choose --> Sel[SELECT from DB]
    Sel --> Show[Show data]
    Show --> Select
    
    Action -->|Update| ChooseUpd[Choose workshop]
    ChooseUpd --> Change[Change data]
    Change --> ValidateUpd{Validate}
    ValidateUpd -->|OK| Update[UPDATE into DB]
    ValidateUpd -->|Error| Change
    Update --> Select
    
    Action -->|Delete| ChooseDel[Choose workshop]
    ChooseDel --> CheckRel{Has related?}
    CheckRel -->|Yes| ErrorDel[Cannot delete]
    CheckRel -->|No| Delete[DELETE from DB]
    ErrorDel --> Select
    Delete --> Select
    
    Action -->|Exit| End[End]