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OrientDB遍历功能

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OrientDB遍历功能,orientdb,Orientdb,我要选择连接到另一个顶点的所有顶点。我目前正在OrientDB中使用遍历函数。考虑下面的例子： > create class professor extends V > create class course extends V > insert into professor set name='Smith' Inserted record 'professor#14:0{name:Smith} v1' > insert into course set name='Ca

我要选择连接到另一个顶点的所有顶点。我目前正在OrientDB中使用遍历函数。考虑下面的例子：

> create class professor extends V
> create class course extends V
> insert into professor set name='Smith'
Inserted record 'professor#14:0{name:Smith} v1'

> insert into course set name='Calculus'
Inserted record 'course#15:0{name:Calculus} v1'

> create class teaches extends E
> create edge teaches from #14:0 to #15:0
Created edge '[teaches#16:0{out:#14:0,in:#15:0} v3]'

现在，当我尝试遍历查找史密斯教授教授教授的课程时，我使用以下命令：

> traverse out_teaches from #15:0
----+-----+---------+-----+-----------+-----+-----
#   |@RID |@CLASS   |name |out_teaches|out  |in   
----+-----+---------+-----+-----------+-----+-----
0   |#14:0|professor|Smith|[size=1]   |null |null 
1   |#16:0|teaches  |null |null       |#14:0|#15:0
----+-----+---------+-----+-----------+-----+-----

为什么这会返回给我边，而不是我正在寻找的顶点路线？将顶点返回给我的适当命令是什么？我希望返回“演算”的记录。

您的查询对我来说运行良好

在我的例子中，教授的rid为11:0，课程为12:0，教师为13:0

只需再次运行查询或尝试以下操作：

从12:0开始遍历两个“教师”

您的查询对我来说很好

在我的例子中，教授的rid为11:0，课程为12:0，教师为13:0

只需再次运行查询或尝试以下操作：

从12:0开始遍历两个“教师”

您的查询对我来说很好

在我的例子中，教授的rid为11:0，课程为12:0，教师为13:0

只需再次运行查询或尝试以下操作：

从12:0开始遍历两个“教师”

您的查询对我来说很好

在我的例子中，教授的rid为11:0，课程为12:0，教师为13:0

只需再次运行查询或尝试以下操作：

从12:0开始遍历两个'teachs'

至少在OrientDB 2.1中选择课程的正确语法将基于out'teachs'。例如：

> select expand(out('teaches')) from (select from Professor where name='Smith')

----+-----+------+--------+----------
#   |@RID |@CLASS|name    |in_teaches
----+-----+------+--------+----------
0   |#12:0|Course|Calculus|[size=1]  
----+-----+------+--------+----------

也就是说，正如预期的那样，只有一个顶点

请注意，“导线测量”用于不同的目的。它涉及一个遍历图的迭代过程

外教 out是对边的引用。使用OrientDB 2.1.7，我为您的out\u查询获得的响应如下：

> select expand(out_teaches) from (select from Professor where name='Smith')

----+-----+-------+-----+-----
#   |@RID |@CLASS |out  |in   
----+-----+-------+-----+-----
0   |#13:0|teaches|#11:0|#12:0
----+-----+-------+-----+-----

同样，这也是我们所期望的——优势。

至少在OrientDB 2.1中，选择课程的正确语法将基于“教师”之外的内容。例如：

> select expand(out('teaches')) from (select from Professor where name='Smith')

----+-----+------+--------+----------
#   |@RID |@CLASS|name    |in_teaches
----+-----+------+--------+----------
0   |#12:0|Course|Calculus|[size=1]  
----+-----+------+--------+----------

也就是说，正如预期的那样，只有一个顶点

请注意，“导线测量”用于不同的目的。它涉及一个遍历图的迭代过程

外教 out是对边的引用。使用OrientDB 2.1.7，我为您的out\u查询获得的响应如下：

> select expand(out_teaches) from (select from Professor where name='Smith')

----+-----+-------+-----+-----
#   |@RID |@CLASS |out  |in   
----+-----+-------+-----+-----
0   |#13:0|teaches|#11:0|#12:0
----+-----+-------+-----+-----

同样，这也是我们所期望的——优势。

至少在OrientDB 2.1中，选择课程的正确语法将基于“教师”之外的内容。例如：

> select expand(out('teaches')) from (select from Professor where name='Smith')

----+-----+------+--------+----------
#   |@RID |@CLASS|name    |in_teaches
----+-----+------+--------+----------
0   |#12:0|Course|Calculus|[size=1]  
----+-----+------+--------+----------

也就是说，正如预期的那样，只有一个顶点

请注意，“导线测量”用于不同的目的。它涉及一个遍历图的迭代过程

外教 out是对边的引用。使用OrientDB 2.1.7，我为您的out\u查询获得的响应如下：

> select expand(out_teaches) from (select from Professor where name='Smith')

----+-----+-------+-----+-----
#   |@RID |@CLASS |out  |in   
----+-----+-------+-----+-----
0   |#13:0|teaches|#11:0|#12:0
----+-----+-------+-----+-----

同样，这也是我们所期望的——优势。

至少在OrientDB 2.1中，选择课程的正确语法将基于“教师”之外的内容。例如：

> select expand(out('teaches')) from (select from Professor where name='Smith')

----+-----+------+--------+----------
#   |@RID |@CLASS|name    |in_teaches
----+-----+------+--------+----------
0   |#12:0|Course|Calculus|[size=1]  
----+-----+------+--------+----------

也就是说，正如预期的那样，只有一个顶点

请注意，“导线测量”用于不同的目的。它涉及一个遍历图的迭代过程

外教 out是对边的引用。使用OrientDB 2.1.7，我为您的out\u查询获得的响应如下：

> select expand(out_teaches) from (select from Professor where name='Smith')

----+-----+-------+-----+-----
#   |@RID |@CLASS |out  |in   
----+-----+-------+-----+-----
0   |#13:0|teaches|#11:0|#12:0
----+-----+-------+-----+-----

同样，这是人们所期望的——一条边。

我稍微扩展了一下您的图形以尝试您的查询

如果您只想知道通过边“教导”连接到某个起始顶点的连接顶点，则应使用“选择展开/插入/两者”，因为如果您希望在不同深度探索图形，则“遍历”更为有用。在我的案例中，Smith有@rid 11:0：

从select from Professor where name='Smith'中选择expandout'teachs'

或者从11:0选择expandout“教学”，您将获得相同的结果：

----+-----+------+------------+----------+----------
#   |@RID |@CLASS|name        |in_teaches|in_follows
----+-----+------+------------+----------+----------
0   |#12:0|course|Calculus    |[size=1]  |[size=1]
1   |#12:1|course|Astrophysics|[size=1]  |[size=1]
2   |#12:2|course|Law         |[size=2]  |[size=1]
----+-----+------+------------+----------+----------

或者您可以获得Smith教授的所有连接顶点

select expand(out()) from professor where name="Smith"

----+-----+----------+------------+----------+----------+------------+----------
#   |@RID |@CLASS    |name        |in_teaches|in_follows|in_studiesAt|in_worksAt
----+-----+----------+------------+----------+----------+------------+----------
0   |#12:0|course    |Calculus    |[size=1]  |[size=1]  |null        |null
1   |#12:1|course    |Astrophysics|[size=1]  |[size=1]  |null        |null
2   |#12:2|course    |Law         |[size=2]  |[size=1]  |null        |null
3   |#16:0|university|Cambridge   |null      |null      |[size=1]    |[size=1]
----+-----+----------+------------+----------+----------+------------+----------

您的查询“从11:0开始遍历”似乎列出了起始顶点以及具有相对进出顶点的所有连接边：

----+-----+---------+-----+-----------+-----------+-----+-----
#   |@RID |@CLASS   |name |out_teaches|out_worksAt|out  |in
----+-----+---------+-----+-----------+-----------+-----+-----
0   |#11:0|professor|Smith|[size=3]   |[size=1]   |null |null
1   |#13:0|teaches  |null |null       |null       |#11:0|#12:0
2   |#13:1|teaches  |null |null       |null       |#11:0|#12:1
3   |#13:2|teaches  |null |null       |null       |#11:0|#12:2
----+-----+---------+-----+-----------+-----------+-----+-----

我还尝试从professor中遍历_teachs，结果与前面的查询类似：

----+-----+---------+-----+-----------+-----------+-----+-----
#   |@RID |@CLASS   |name |out_teaches|out_worksAt|out  |in
----+-----+---------+-----+-----------+-----------+-----+-----
0   |#11:0|professor|Smith|[size=3]   |[size=1]   |null |null
1   |#13:0|teaches  |null |null       |null       |#11:0|#12:0
2   |#13:1|teaches  |null |null       |null       |#11:0|#12:1
3   |#13:2|teaches  |null |null       |null       |#11:0|#12:2
4   |#11:1|professor|Green|[size=1]   |[size=1]   |null |null
5   |#13:3|teaches  |null |null       |null       |#11:1|#12:2
----+-----+---------+-----+-----------+-----------+-----+-----

我稍微扩展了一下您的图表以尝试您的查询

从select from Professor where name='Smith'中选择expandout'teachs'

或者从11:0选择expandout“教学”，您将获得相同的结果：

----+-----+------+------------+----------+----------
#   |@RID |@CLASS|name        |in_teaches|in_follows
----+-----+------+------------+----------+----------
0   |#12:0|course|Calculus    |[size=1]  |[size=1]
1   |#12:1|course|Astrophysics|[size=1]  |[size=1]
2   |#12:2|course|Law         |[size=2]  |[size=1]
----+-----+------+------------+----------+----------

或者您可以获得Smith教授的所有连接顶点

select expand(out()) from professor where name="Smith"

----+-----+----------+------------+----------+----------+------------+----------
#   |@RID |@CLASS    |name        |in_teaches|in_follows|in_studiesAt|in_worksAt
----+-----+----------+------------+----------+----------+------------+----------
0   |#12:0|course    |Calculus    |[size=1]  |[size=1]  |null        |null
1   |#12:1|course    |Astrophysics|[size=1]  |[size=1]  |null        |null
2   |#12:2|course    |Law         |[size=2]  |[size=1]  |null        |null
3   |#16:0|university|Cambridge   |null      |null      |[size=1]    |[size=1]
----+-----+----------+------------+----------+----------+------------+----------

您的查询“从11:0开始遍历”似乎列出了起始顶点以及具有相对进出顶点的所有连接边：

----+-----+---------+-----+-----------+-----------+-----+-----
#   |@RID |@CLASS   |name |out_teaches|out_worksAt|out  |in
----+-----+---------+-----+-----------+-----------+-----+-----
0   |#11:0|professor|Smith|[size=3]   |[size=1]   |null |null
1   |#13:0|teaches  |null |null       |null       |#11:0|#12:0
2   |#13:1|teaches  |null |null       |null       |#11:0|#12:1
3   |#13:2|teaches  |null |null       |null       |#11:0|#12:2
----+-----+---------+-----+-----------+-----------+-----+-----

我也试过了 ut_教授授课，结果与前面的查询类似：

----+-----+---------+-----+-----------+-----------+-----+-----
#   |@RID |@CLASS   |name |out_teaches|out_worksAt|out  |in
----+-----+---------+-----+-----------+-----------+-----+-----
0   |#11:0|professor|Smith|[size=3]   |[size=1]   |null |null
1   |#13:0|teaches  |null |null       |null       |#11:0|#12:0
2   |#13:1|teaches  |null |null       |null       |#11:0|#12:1
3   |#13:2|teaches  |null |null       |null       |#11:0|#12:2
4   |#11:1|professor|Green|[size=1]   |[size=1]   |null |null
5   |#13:3|teaches  |null |null       |null       |#11:1|#12:2
----+-----+---------+-----+-----------+-----------+-----+-----

我稍微扩展了一下您的图表以尝试您的查询

从select from Professor where name='Smith'中选择expandout'teachs'

或者从11:0选择expandout“教学”，您将获得相同的结果：

----+-----+------+------------+----------+----------
#   |@RID |@CLASS|name        |in_teaches|in_follows
----+-----+------+------------+----------+----------
0   |#12:0|course|Calculus    |[size=1]  |[size=1]
1   |#12:1|course|Astrophysics|[size=1]  |[size=1]
2   |#12:2|course|Law         |[size=2]  |[size=1]
----+-----+------+------------+----------+----------

或者您可以获得Smith教授的所有连接顶点

select expand(out()) from professor where name="Smith"

----+-----+----------+------------+----------+----------+------------+----------
#   |@RID |@CLASS    |name        |in_teaches|in_follows|in_studiesAt|in_worksAt
----+-----+----------+------------+----------+----------+------------+----------
0   |#12:0|course    |Calculus    |[size=1]  |[size=1]  |null        |null
1   |#12:1|course    |Astrophysics|[size=1]  |[size=1]  |null        |null
2   |#12:2|course    |Law         |[size=2]  |[size=1]  |null        |null
3   |#16:0|university|Cambridge   |null      |null      |[size=1]    |[size=1]
----+-----+----------+------------+----------+----------+------------+----------

您的查询“从11:0开始遍历”似乎列出了起始顶点以及具有相对进出顶点的所有连接边：

----+-----+---------+-----+-----------+-----------+-----+-----
#   |@RID |@CLASS   |name |out_teaches|out_worksAt|out  |in
----+-----+---------+-----+-----------+-----------+-----+-----
0   |#11:0|professor|Smith|[size=3]   |[size=1]   |null |null
1   |#13:0|teaches  |null |null       |null       |#11:0|#12:0
2   |#13:1|teaches  |null |null       |null       |#11:0|#12:1
3   |#13:2|teaches  |null |null       |null       |#11:0|#12:2
----+-----+---------+-----+-----------+-----------+-----+-----

我还尝试从professor中遍历_teachs，结果与前面的查询类似：

----+-----+---------+-----+-----------+-----------+-----+-----
#   |@RID |@CLASS   |name |out_teaches|out_worksAt|out  |in
----+-----+---------+-----+-----------+-----------+-----+-----
0   |#11:0|professor|Smith|[size=3]   |[size=1]   |null |null
1   |#13:0|teaches  |null |null       |null       |#11:0|#12:0
2   |#13:1|teaches  |null |null       |null       |#11:0|#12:1
3   |#13:2|teaches  |null |null       |null       |#11:0|#12:2
4   |#11:1|professor|Green|[size=1]   |[size=1]   |null |null
5   |#13:3|teaches  |null |null       |null       |#11:1|#12:2
----+-----+---------+-----+-----------+-----------+-----+-----

我稍微扩展了一下您的图表以尝试您的查询

从select from Professor where name='Smith'中选择expandout'teachs'

或者从11:0选择expandout“教学”，您将获得相同的结果：

----+-----+------+------------+----------+----------
#   |@RID |@CLASS|name        |in_teaches|in_follows
----+-----+------+------------+----------+----------
0   |#12:0|course|Calculus    |[size=1]  |[size=1]
1   |#12:1|course|Astrophysics|[size=1]  |[size=1]
2   |#12:2|course|Law         |[size=2]  |[size=1]
----+-----+------+------------+----------+----------

或者您可以获得Smith教授的所有连接顶点

select expand(out()) from professor where name="Smith"

----+-----+----------+------------+----------+----------+------------+----------
#   |@RID |@CLASS    |name        |in_teaches|in_follows|in_studiesAt|in_worksAt
----+-----+----------+------------+----------+----------+------------+----------
0   |#12:0|course    |Calculus    |[size=1]  |[size=1]  |null        |null
1   |#12:1|course    |Astrophysics|[size=1]  |[size=1]  |null        |null
2   |#12:2|course    |Law         |[size=2]  |[size=1]  |null        |null
3   |#16:0|university|Cambridge   |null      |null      |[size=1]    |[size=1]
----+-----+----------+------------+----------+----------+------------+----------

您的查询“从11:0开始遍历”似乎列出了起始顶点以及具有相对进出顶点的所有连接边：

----+-----+---------+-----+-----------+-----------+-----+-----
#   |@RID |@CLASS   |name |out_teaches|out_worksAt|out  |in
----+-----+---------+-----+-----------+-----------+-----+-----
0   |#11:0|professor|Smith|[size=3]   |[size=1]   |null |null
1   |#13:0|teaches  |null |null       |null       |#11:0|#12:0
2   |#13:1|teaches  |null |null       |null       |#11:0|#12:1
3   |#13:2|teaches  |null |null       |null       |#11:0|#12:2
----+-----+---------+-----+-----------+-----------+-----+-----

我还尝试从professor中遍历_teachs，结果与前面的查询类似：

----+-----+---------+-----+-----------+-----------+-----+-----
#   |@RID |@CLASS   |name |out_teaches|out_worksAt|out  |in
----+-----+---------+-----+-----------+-----------+-----+-----
0   |#11:0|professor|Smith|[size=3]   |[size=1]   |null |null
1   |#13:0|teaches  |null |null       |null       |#11:0|#12:0
2   |#13:1|teaches  |null |null       |null       |#11:0|#12:1
3   |#13:2|teaches  |null |null       |null       |#11:0|#12:2
4   |#11:1|professor|Green|[size=1]   |[size=1]   |null |null
5   |#13:3|teaches  |null |null       |null       |#11:1|#12:2
----+-----+---------+-----+-----------+-----------+-----+-----

从15:0开始，特拉弗斯的两位“老师”都会把课程和教授还给我。我重新运行了上一个查询，但仍然得到相同的结果。我想知道答案。谢谢你，从15:0开始，两位老师都会把课程和教授还给我。我重新运行了上一个查询，但仍然得到相同的结果。我想知道答案。谢谢你，从15:0开始，两位老师都会把课程和教授还给我。我重新运行了上一个查询，但仍然得到相同的结果。我想知道答案。谢谢你，从15:0开始，两位老师都会把课程和教授还给我。我重新运行了上一个查询，但仍然得到相同的结果。我想知道答案。非常感谢。