OrientDB:在pyorient中为两个顶点类创建边

Question

我试图使用pyorient为两个顶点类创建一个边。我所做的就是；

vertex_class = client.command( "create class ABC extends V")
vertex_class = client.command( "create class my_class extends V")
edge_class = client.command("CREATE CLASS E12 EXTENDS E")
edge_class = client.command("create edge E12 from ABC to my_class")

顶点类和边缘类是成功创建的，但是，我无法创建边缘。对我做错了什么有什么想法吗？我必须先添加顶点吗?如果是的话，那么我如何在pyorient中这样做呢？

Answer 1

这个错误似乎与python无关。这个问题更像是一个OrientDB问题，而不是python问题。创建边缘时，必须指定资源id，或者可以使用内联选择。我正在使用一个不同的例子，因为我不清楚你的顶点，边缘和链接。

CREATE CLASS Customer EXTENDS V
CREATE CLASS Account EXTENDS V
CREATE CLASS Owns EXTENDS E

CREATE VERTEX Customer SET name = 'John'
CREATE VERTEX Account SET accountnum = '12345678910'

#Option 1: You will have to get the rid of the vertices 
# You can use SELECT to get the record ID. 
# SELECT FROM Customer WHERE name = 'John'
# SELECT FROM Account where accountnum = '12345678910'
# Use the RID to create the edge
CREATE EDGE owns FROM #10:0 TO #11:0

#Option 2: You can use select inline which will create all the edges
CREATE EDGE Owns FROM ( SELECT FROM Customer where name = 'John' ) TO ( 
SELECT FROM Account where accountnum = '12345678910' )