Package visgraph :: Module dbcore :: Class DbSubGraph

Class DbSubGraph

   DbGraphStore --+
                  |
graphcore.Graph --+
                  |
                 DbSubGraph

A subgraph in the database is basically a forward cached instance of selected nodes and edges in an in-memory graph (visgraph.graphcore.Graph). This object may then be used for traditional path tracing without going back to the database.

Any modifications to graph element properties *will* be synchronized back to the database backing the given subgraph.

Instance Methods

[hide private]

__init__(self, dbinfo)

source code

addNode(self, nodeid=None, ninfo=None, **kwargs)
Add a Node object to the graph.

source code

addEdge(self, fromid, toid, einfo)
Add an edge to the graph.

source code

useEdges(self, **kwargs)
Pull some edges from the DbStore backing this subgraph into the actual visgraph.graphcore.Graph instance so path traversal is possible.

source code

expandNode(self, nid, maxdepth=1)
Add *all* the edges (and adjacent nodes) by traversing this nodes edges to the specified depth...

source code

Inherited from DbGraphStore: buildSubGraph, delEdge, delNode, delNodeInfo, getEdgeInfo, getNodeInfo, getNodeProps, getRefsFrom, getRefsTo, searchNodes, setEdgeInfo, setNodeInfo

Inherited from DbGraphStore (private): _doCommit, _doInsert, _doInsertRetId, _doSelect, _doUpdate

Inherited from graphcore.Graph: getClusterGraphs, getEdge, getEdges, getMeta, getNode, getNodes, hasNode, pathSearch, pathSearchFrom, pathSearchOne, setMeta, wipeGraph

Method Details

[hide private]

init(self, dbinfo)
(Constructor)

source code

Overrides: graphcore.Graph.__init__

addNode(self, nodeid=None, ninfo=None, **kwargs)

source code


Add a Node object to the graph.  Returns the nodeid.

Example: nid = g.addNode()
         g.addNode('woot', {'height':20, 'width':20})

NOTE: If nodeid is unspecified, it is considered an 'anonymous'
      node and will have an ID automagically assigned.

Overrides: graphcore.Graph.addNode: (inherited documentation)

addEdge(self, fromid, toid, einfo)

source code

Add an edge to the graph. Edges are directional.

Example: g.addEdge(node_1, node_2, einfo={'name':'Woot Edge'})

Overrides: graphcore.Graph.addEdge: (inherited documentation)

Class DbSubGraph

__init__(self, dbinfo) (Constructor)

addNode(self, nodeid=None, ninfo=None, **kwargs)

addEdge(self, fromid, toid, einfo)

init(self, dbinfo)
(Constructor)