Components - Family of functions

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 ANY-INTEGER and ANY-NUMERICAL
    • 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

Parameters

Parameter Type Default Description
Edges SQL TEXT   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 ANY-INTEGER   Identifier of the edge.
source ANY-INTEGER   Identifier of the first end point vertex of the edge.
target ANY-INTEGER   Identifier of the second end point vertex of the edge.
cost ANY-NUMERICAL  

Weight of the edge (source, target)

  • When negative: edge (source, target) does not exist, therefore it’s not part of the graph.
reverse_cost ANY-NUMERICAL -1

Weight of the edge (target, source),

  • When negative: edge (target, source) does not exist, therefore it’s not part of the graph.

Where:

ANY-INTEGER:SMALLINT, INTEGER, BIGINT
ANY-NUMERICAL:SMALLINT, INTEGER, BIGINT, REAL, FLOAT

Result Columns

pgr_connectedComponents & pgr_strongComponents

Returns set of (seq, component, node)

Column Type Description
seq BIGINT Sequential value starting from 1.
component BIGINT Component identifier. It is equal to the minimum node identifier in the component.
node BIGINT Identifier of the vertex that belongs to component.

pgr_biconnectedComponents

Returns set of (seq, component, edge)

Column Type Description
seq BIGINT Sequential value starting from 1.
component BIGINT Component identifier. It is equal to the minimum edge identifier in the component.
edge BIGINT Identifier of the edge.

pgr_articulationPoints

Returns set of (node)

Column Type Description
node BIGINT Identifier of the vertex.

pgr_bridges

Returns set of (edge)

Column Type Description
edge BIGINT Identifier of the edge that is a bridge.

pgr_makeConnected - Experimental

Returns set of (seq, start_vid, end_vid)

Column Type Description
seq INT Sequential value starting from 1.
start_vid BIGINT Identifier of the first end point vertex of the edge.
end_vid BIGINT Identifier of the second end point vertex of the edge.

See Also

Indices and tables