在CMDB中有2个核心概念：

实体
关系

为了灵活管理多个实体，对实体引入了实体组的概念。

-- 建立 顶点 Group
CREATE CLASS Group EXTENDS V;
-- 建立 顶点 Enity
CREATE CLASS Enity EXTENDS V;
--- 建立 边 Relation
CREATE CLASS Relation EXTENDS E;

-- 建立名为“运维资产”的实体组
CREATE VERTEX Group SET name="运维资产";
-- 建立名为“物理机”的实体
CREATE VERTEX Enity SET name="物理机";
-- 建立名为“机架”的实体
CREATE VERTEX Enity SET name="机架";


-- 建立关系 Contain
CREATE CLASS Contain EXTENDS Relation;
-- 建立关系 Lay
CREATE CLASS Lay EXTENDS Relation;
-- 建立关系 RelayOn
CREATE CLASS RelayOn EXTENDS Relation;




-- # contain, lay 直接基于Relation，看起来行不通。

-- CREATE EDGE Relation SET name="属于";

-- CREATE EDGE Relation SET name="放置在";


CREATE EDGE Contain FROM (select from Group where name='运维资产' ) TO ( select from Enity where name='物理机' );

CREATE EDGE Contain FROM (select from Group where name='运维资产' ) TO ( select from Enity where name='机架' );




CREATE EDGE Lay FROM (select from Enity where name='物理机' ) TO ( select from Enity where name='机架' );

-- A实体 和 A实体 无法建立关系。
CREATE EDGE RelayOn FROM (select from Enity where name='物理机' ) TO ( select from Enity where name='物理机' );

-- 实体A 和 实体B 之间可以有多种关系；
CREATE EDGE RelayOn FROM (select from Enity where name='物理机' ) TO ( select from Enity where name='机架' );

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-- 可以建立两个 名为“物理机”的实体A，然后就可以建立关系
CREATE VERTEX Enity SET name="物理机";

CREATE EDGE RelayOn FROM (select from Enity where name='物理机' ) TO ( select from Enity where name='物理机' );

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扩展阅读：

==== 抽象


CREATE CLASS Group EXTENDS V;


CREATE CLASS Enity EXTENDS V;


CREATE CLASS Relation EXTENDS E;


CREATE CLASS Rack EXTENDS Enity;

CREATE CLASS PhysicalMachine EXTENDS Enity;



CREATE CLASS Contain EXTENDS Relation;

CREATE CLASS Lay EXTENDS Relation;






CREATE EDGE Lover FROM (select from Preson where name='小朱') TO (select from Preson where name='小刘');



----
-- CREATE CLASS Relay EXTENDS E;
-- CREATE CLASS Contain EXTENDS E;


CREATE VERTEX Group SET name="运维资产";

CREATE VERTEX Enity SET name="物理机";

CREATE VERTEX Enity SET name="机架";

CREATE VERTEX Relation SET name="属于";

CREATE VERTEX Relation SET name="放置在";