Components  Family of functions  pgRouting Manual (3.3)
Components  Family of functions

pgr_connectedComponents  Connected components of an undirected graph.

pgr_strongComponents  Strongly connected components of a directed graph.

pgr_biconnectedComponents  Biconnected components of an undirected graph.

pgr_articulationPoints  Articulation points of an undirected graph.

pgr_bridges  Bridges of an undirected graph.
Experimental
Warning
Possible server crash

These functions might create a server crash
Warning
Experimental functions

They are not officially of the current release.

They likely will not be officially be part of the next release:

The functions might not make use of ANYINTEGER and ANYNUMERICAL

Name might change.

Signature might change.

Functionality might change.

pgTap tests might be missing.

Might need c/c++ coding.

May lack documentation.

Documentation if any might need to be rewritten.

Documentation examples might need to be automatically generated.

Might need a lot of feedback from the comunity.

Might depend on a proposed function of pgRouting

Might depend on a deprecated function of pgRouting


pgr_makeConnected  Experimental  Details of edges to make graph connected.
Parameters
Parameter 
Type 
Default 
Description 

Edges SQL 

Inner query as described below. 
Inner query
 Edges SQL :

an SQL query which should return a set of rows with the following columns:
Column 
Type 
Default 
Description 

id 

Identifier of the edge. 

source 

Identifier of the first end point vertex of the edge. 

target 

Identifier of the second end point vertex of the edge. 

cost 

Weight of the edge (source, target)


reverse_cost 

1 
Weight of the edge (target, source) ,

Where:
 ANYINTEGER :

SMALLINT, INTEGER, BIGINT
 ANYNUMERICAL :

SMALLINT, INTEGER, BIGINT, REAL, FLOAT
Result Columns
pgr_connectedComponents & pgr_strongComponents
Returns set of
(seq,
component,
node)
Column 
Type 
Description 

seq 

Sequential value starting from 1 . 
component 

Component identifier. It is equal to the minimum node identifier in the component. 
node 

Identifier of the vertex that belongs to component . 
pgr_biconnectedComponents
Returns set of
(seq,
component,
edge)
Column 
Type 
Description 

seq 

Sequential value starting from 1 . 
component 

Component identifier. It is equal to the minimum edge identifier in the component. 
edge 

Identifier of the edge. 
pgr_articulationPoints
Returns set of
(node)
Column 
Type 
Description 

node 

Identifier of the vertex. 
pgr_bridges
Returns set of
(edge)
Column 
Type 
Description 

edge 

Identifier of the edge that is a bridge. 
pgr_makeConnected  Experimental
Returns set of
(seq,
start_vid,
end_vid)
Column 
Type 
Description 

seq 

Sequential value starting from 1 . 
start_vid 

Identifier of the first end point vertex of the edge. 
end_vid 

Identifier of the second end point vertex of the edge. 
See Also
Indices and tables