OrientDB 圖計算框架
圖計算框架學習示例
概念
- 圖（Graph）G=（V,E）
V是非空集合的頂點集，E是V中頂點構成的無序二元組的邊集合。 G的邊集合數範圍： 0≤E≤N(N-1)/2
E = {(V^1,V^2),(V^1,V^3)......(V^i,V^j)}- 點（Vertex）
- 邊（Edge）
安裝步驟 點擊下載
開發環境 Host 172.30.13.197
cd /home/work/local/orientdb-community-2.2.12
./bin/server.sh &Web管理後臺：http://172.30.13.197:2480/studio/index.html
- 首次啓動時會提醒建立Root賬戶密碼
SQL基本操作
1.新增VerTex
CREATE VERTEX V SET name="user01",sex="M",age="25";
CREATE VERTEX V SET name="user02",sex="F",age="23";2.刪除VerTex
DELETE VERTEX V WHERE name="user01";3.新增Edge
CREATE EDGE E FROM #1:1 TO #1:2 SET name="friend";4.刪除Edge
DELETE EDGE E WHERE name="friend";刪除某個VerTex頂點時，其附加的Edge自動失效
代碼示例（java）
小朱25歲，出生在教師家庭並且有個姐姐小田，他現在奮鬥在帝都。
那麼SQL是這樣滴！！！
CREATE VERTEX V SET name="小朱",sex="男",age="25";
CREATE VERTEX V SET name="小田",sex="女",age="27";
CREATE EDGE E FROM #9:0 TO #10:0 SET name="sisiter";
CREATE EDGE E FROM #10:0 TO #9:0 SET name="brother";
Select from V where name in ['小朱',"小田"];
* select 在 Graph 頁面查詢會自動渲染出關繫結果
小朱還有一個可愛的女盆友叫小劉
CREATE VERTEX V SET name="小劉",sex="女",age="23";
CREATE EDGE E FROM #9:0 TO #11:0 SET name="lover";
CREATE EDGE E FROM #11:0 TO #9:0 SET name="lover";
小朱目前工作在企業ABC，他有一堆同事小馬、小龔、小微…..
CREATE VERTEX V SET name="ABC";
CREATE VERTEX V SET name="小馬",sex="男",age="29",company="ABC";
CREATE VERTEX V SET name="小龔",sex="男",age="28",company="ABC";
CREATE VERTEX V SET name="小微",sex="女",age="24",company="ABC";
UPDATE V SET company = 'ABC' WHERE name='小朱'
CREATE EDGE E FROM (select from V where company='ABC') TO (select from V where name ='ABC') SET name="employee";
小朱目前跟不同同事合作完成了如下項目：PROJECT-1,PROJECT-2,PROJECT-3…..
CREATE VERTEX V SET name="PROJECT-1",type='JAVA',starttime='2016/01/01';
CREATE VERTEX V SET name="PROJECT-2",type='JAVA',starttime='2016/01/01';
CREATE VERTEX V SET name="PROJECT-3",type='JAVA',starttime='2016/01/01';
CREATE EDGE E FROM (select from V where name in ['小朱','小馬','小微']) TO (select from v where name='PROJECT-1') SET name="work";
CREATE EDGE E FROM (select from V where name in ['小朱','小馬','小微','小龔']) TO (select from v where name='PROJECT-2') SET name="work";
CREATE EDGE E FROM (select from V where name in ['小朱','小馬','小龔']) TO (select from v where name='PROJECT-3') SET name="work";
- 所有點和邊緣均繼承祖先V、E對象，不能方便的通過語句進行篩選，不推薦直接創建V、E記錄。
改造以上實例，用不同的關係對象表示
上圖出現了兩種對象（公司，人,項目）……劃分規則，看心情
有5類關係（情侶，姐,弟，僱員，合作）
莫名其妙有了V{Company,Preson,Project}，E{Lover,sisiter,brother,employee,work}
CREATE CLASS Company EXTENDS V;
CREATE CLASS Project EXTENDS V;
CREATE CLASS Preson EXTENDS V;
CREATE CLASS Lover EXTENDS E;
CREATE CLASS Sisiter EXTENDS E;
CREATE CLASS Brother EXTENDS E;
CREATE CLASS Employee EXTENDS E;
CREATE CLASS Work EXTENDS E;
CREATE VERTEX Preson SET name="小朱",sex="男",age="25",company="Lianjia";
CREATE VERTEX Preson SET name="小劉",sex="女",age="23";
CREATE VERTEX Preson SET name="小田",sex="女",age="27";
CREATE VERTEX Company SET name="Lianjia";
CREATE VERTEX Preson SET name="小馬",sex="男",age="29",company="Lianjia";
CREATE VERTEX Preson SET name="小龔",sex="男",age="28",company="Lianjia";
CREATE VERTEX Preson SET name="小微",sex="女",age="24",company="Lianjia";
CREATE VERTEX Project SET name="PROJECT-1",type='JAVA',starttime='2016/01/01';
CREATE VERTEX Project SET name="PROJECT-2",type='JAVA',starttime='2016/01/01';
CREATE VERTEX Project SET name="PROJECT-3",type='JAVA',starttime='2016/01/01';
#把以前的頂點移動到每個具體的類別
#MOVE VERTEX(SELECT FROM V WHERE name='ABC') TO CLASS:Company;
#創建情侶關係
CREATE EDGE Lover FROM (select from Preson where name='小朱') TO (select from Preson where name='小劉');
CREATE EDGE Lover FROM (select from Preson where name='小劉') TO (select from Preson where name='小朱');
#創建姐弟關係
CREATE EDGE Sisiter FROM (select from Preson where name='小朱') TO (select from Preson where name='小田');
CREATE EDGE Brother FROM (select from Preson where name='小田') TO (select from Preson where name='小朱');
#創建僱傭關係
CREATE EDGE Employee FROM (select from Preson where company='Lianjia') TO (select from Company where name ='Lianjia');
#創建項目關係
CREATE EDGE Work FROM (select from Preson where name in ['小朱','小馬','小微']) TO (select from Project where name='PROJECT-1');
CREATE EDGE Work FROM (select from Preson where name in ['小朱','小馬','小微','小龔']) TO (select from Project where name='PROJECT-2');
CREATE EDGE Work FROM (select from Preson where name in ['小朱','小馬','小龔']) TO (select from Project where name='PROJECT-3');
