|o	o|	0或1
||	||	恰好一个
}o	o{	0 或 更多 (没有上限)
}|	|{	1 或 更多 (没有上限)

  erDiagram
    Equipment ||--|| EquipmentModel : has
    Equipment ||--|{ EquipmentStatusChangeRecord : has
    Warning }o--|| Equipment : relate
    Warning ||--o| Ticket : relate
    Ticket ||--|{ TicketHistory : has
    Ticket ||--|| TicketType : has
    Ticket ||--|| User : has
    TicketHistory ||--o| Transaction : relate
    Ticket }o--|| Equipment : relate
    TicketHistory ||--|| User : has
    TicketHistory ||--|| EquipmentStatusChangeRecord : trigger

    Equipment {
        uuid ID
        string name "名称"
        date createAt "创建时间"
        date updateAt "更新时间"
        int status "状态"
    }
    EquipmentModel {
        uuid ID
        string name "名称"
        date createAt "创建时间"
        date updateAt "更新时间"
        string comment "备注"
    }
    EquipmentStatusChangeRecord {
        uuid ID
        uuid EquipmentID "设备ID 非空"
        int statusA "原状态"
        int statusB "新状态"
        date changeAt "触发时间"
    }
    Ticket {
        uuid ID
        string name "名称"
        date createAt "创建时间"
        date updateAt "更新时间"
        int status "状态"
    }

    TicketHistory {
        uuid ID
        uuid ticketID "工单ID 非空"
        int statusA "原状态"
        int statusB "新状态"
    }

    TicketType {
        uuid ID
        string name "名称"
    }

    Warning {
        uuid ID
        string type "类型"
        date createAt "创建时间"
        date updateAt "更新时间"
        int status "状态"
    }

flowchart TD
    A --> B

flowchart LR
    A --> B

flowchart LR
    A(圆角矩形) -.- B([椭圆形]) -.- C((圆形)) -.- D[(圆柱形)]
	Espan>subroutine] -.- G{菱形} -.- H{{六角形}}
	I[/平行四边形/] -.- J[\平行四边形\] -.- K[\梯形/] -.- L[/梯形\]

flowchart LR
    A --> B & C--> D

flowchart TD
    A & B--> C & D

flowchart TD
    A --> C
    A --> D
    B --> C
    B --> D

flowchart TD
    A[Start] --> B{Is it?}
    B -->|Yes| C[OK]
    C --> D[Rethink]
    D --> B
    B ---->|No| E[End]

flowchart LR
    A --o B
    B --x C

flowchart LR
    A o--o B
    B <--> C
    C x--x D

  flowchart LR```

    subgraph receiver1[Receiver I]
        gnet --> verify --> dispatcher1[dispatcher] --> sender
        dispatcher1 --> cache1[cache] --> websocket1[websocket]
    end
    subgraph receiver2[Receiver II]
        sync --> dispatcher3[dispatcher] --> grpc[grpc client]
        dispatcher3 --> cache3[cache] --> websocket3[websocket]
        kvcache --> websocket3
    end
    hardware & simulator --TCP--> gnet
    sender -.-> sync
    grpc --gRPC--> storage
    websocket1 --> client1[websocket client]
    websocket3 --> client3[websocket client]
    ```

pie title 标题
    "Dogs" : 38
    "Cats" : 85
    "Rats" : 15

classDiagram
    Animal <|-- Duck
    Animal <|-- Fish
    Animal <|-- Zebra
    Animal : +int age
    Animal : +String gender
    Animal: +isMammal()
    Animal: +mate()
    class Duck{
        +String beakColor
        +swim()
        +quack()
    }
    class Fish{
        -int sizeInFeet
        -canEat()
    }
    class Zebra{
        +bool is_wild
        +run()
    }

stateDiagram-v2
    state "状态1" as State1
    State2 : 状态2    
    [*] --> State1

    State1 --> State2: 过渡文本
    State2 --> State1
    State2 --> State3
    state State3 {
        [*] --> second
        second --> [*]
    }

gantt
    title 甘特图
    dateFormat  YYYY-MM-DD
    section 项目
    A 项目           :A1, 2022-01-01, 30d
    B 项目     :after A1  , 20d
    section 子任务
    子任务1      :2022-01-12  , 12d
    子任务2      : 24d

  sequenceDiagram
    participant L as 项目管理
    participant O as 实施人员
    L->>O: 创建安装工单
    Note right of O: 工单的负责人为实施人员
    O->>O: 执行安装工单
    Note right of O: 设备状态变为安装中
    alt 完成安装
        O->>O: 完成安装工单
        Note right of O: 设备状态变为运行
    else 
        O->>O: 废弃安装工单
        Note right of O: 设备状态变为已采购
    end

  sequenceDiagram
    participant S as 平台
    participant M as 监控人员
    participant F as 检修人员
    opt 平台发现情况
        S->>M: 创建预警
        Note right of S: 如果设备已有同类型的非关闭的预警，则更新已有预警
    end
    M->>F: 创建维护工单
    Note right of M: 工单的负责人为检修人员
    F->>F: 执行维护工单
    Note right of F: 设备状态变为检修
    alt 维护完毕
        F->>F: 执行维护工单
        Note right of F: 设备状态变为运行
    else 无法维护
        F->>F: 执行维护工单
        Note right of F: 设备状态变为废弃
    end

flowchart LR
    A["括号 (text)"]

flowchart LR
    A["括号 [text]"]

flowchart LR
    A["引号#quot;"]

flowchart LR
    A["美元符号#36;"]

flowchart LR
    A["笑脸#128512;"]