what is difference b/w link and egde

[thulaseeswara reddy gajjala]

hi

when we use edges and when we used links in real time scenarios.  Is there any difference from both

thanks

[Luigi Dell'Aquila]

Hi,

A link is just a physical pointer, eg.

Record 1: {@rid: #12:0, name:"John" }

Record 2: {@rid: #12:1, name:"Frank", friendOf:#12:0 }

the friendOf attribute here is a link. Given Record 2, you can easily find Record 1 following the link, but if you only know Record 1 you have no information about connected nodes.

An edge is a bit more complex structure, it's actually a document:

Vertex 1: {@rid: #12:0, name:"John", out_friendOf:#13:0 }

Edge: {@rid: #13:0, out:#12:0, in:#12:1, since: 1/3/2015 }

Vertex 2: {@rid: #12:1, name:"Frank", in_friendOf:#13:0 }

As you can see, the underlying structure relies on links (out/in_friendOf on the vertices and out/in on the edge), but 

- the edge is a document, so it can have properties ("since" in this case)

- you have links on both sides, so you can efficiently traverse the edge in both directions

Thanks

Luigi

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