OrientDB 图计算框架
图计算框架学习示例
概念
- 图（Graph）G=（V,E）
V是非空集合的顶点集，E是V中顶点构成的无序二元组的边集合。 G的边集合数范围： 0≤E≤N(N-1)/2
E = {(V^1,V^2),(V^1,V^3)......(V^i,V^j)}- 点（Vertex）
- 边（Edge）
安装步骤 点击下载
开发环境 Host 172.30.13.197
cd /home/work/local/orientdb-community-2.2.12
./bin/server.sh &Web管理后台：http://172.30.13.197:2480/studio/index.html
- 首次启动时会提醒建立Root账户密码
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.删除VerTex
DELETE VERTEX V WHERE name="user01";3.新增Edge
CREATE EDGE E FROM #1:1 TO #1:2 SET name="friend";4.删除Edge
DELETE EDGE E WHERE name="friend";删除某个VerTex顶点时，其附加的Edge自动失效
代码示例（java）
小朱25岁，出生在教师家庭并且有个姐姐小田，他现在奋斗在帝都。
那么SQL是这样滴！！！
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 页面查询会自动渲染出关系结果
小朱还有一个可爱的女盆友叫小刘
CREATE VERTEX V SET name="小刘",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";
小朱目前工作在企业ABC，他有一堆同事小马、小龚、小微…..
CREATE VERTEX V SET name="ABC";
CREATE VERTEX V SET name="小马",sex="男",age="29",company="ABC";
CREATE VERTEX V SET name="小龚",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项目：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','小马','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','小马','小微','小龚']) TO (select from v where name='PROJECT-2') SET name="work";
CREATE EDGE E FROM (select from V where name in ['小朱','小马','小龚']) TO (select from v where name='PROJECT-3') SET name="work";
- 所有点和边缘均继承祖先V、E对象，不能方便的通过语句进行筛选，不推荐直接创建V、E记录。
改造以上实例，用不同的关系对象表示
上图出现了两种对象（公司，人,项目）……划分规则，看心情
有5类关系（情侣，姐,弟，雇员，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="小刘",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="小马",sex="男",age="29",company="Lianjia";
CREATE VERTEX Preson SET name="小龚",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';
#把以前的顶点移动到每个具体的类别
#MOVE VERTEX(SELECT FROM V WHERE name='ABC') TO CLASS:Company;
#创建情侣关系
CREATE EDGE Lover FROM (select from Preson where name='小朱') TO (select from Preson where name='小刘');
CREATE EDGE Lover FROM (select from Preson where name='小刘') TO (select from Preson where name='小朱');
#创建姐弟关系
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');
#创建雇佣关系
CREATE EDGE Employee FROM (select from Preson where company='Lianjia') TO (select from Company where name ='Lianjia');
#创建项目关系
CREATE EDGE Work FROM (select from Preson where name in ['小朱','小马','小微']) TO (select from Project where name='PROJECT-1');
CREATE EDGE Work FROM (select from Preson where name in ['小朱','小马','小微','小龚']) TO (select from Project where name='PROJECT-2');
CREATE EDGE Work FROM (select from Preson where name in ['小朱','小马','小龚']) TO (select from Project where name='PROJECT-3');
