<div dir="ltr"><br><div class="gmail_extra"><br><br><div class="gmail_quote">On Sat, Mar 15, 2014 at 12:57 AM, Carsten Hogertz <span dir="ltr"><<a href="mailto:carsten.hogertz@gmail.com" target="_blank">carsten.hogertz@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">puh, not the simplest task for a non-developer....I mean the function.<div>to get a result with for one row is no problem (using whatever pg_*())</div>
</div></blockquote><div><br></div><div>Of course you don't need to write a plpgsql function.</div><div>You can also make n queries with your programming language of your choice.</div><div>But with pgRouting it's common that you always need to code at least a little bit.<br>
</div><div><br></div><div>Daniel</div><div><br></div><div><br></div><div><br></div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="gmail_extra">
<br><br><div class="gmail_quote">
2014-03-14 16:33 GMT+01:00 Stephen Woodbridge <span dir="ltr"><<a href="mailto:woodbri@swoodbridge.com" target="_blank">woodbri@swoodbridge.com</a>></span>:<div><div class="h5"><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi Carsten,<br>
<br>
I assume you can make a single pgRouting query from point A to B using pgr_astar() or pgr_trsp() or something similar.<br>
<br>
Work that out first. Read the Documentation and the workshop.<br>
<br>
Then you just want to write a simple procedure to query your table and for each row run the pgr_*() query and do something with the results.<br>
<br>
<a href="https://www.google.com/#newwindow=1&q=postgres%20plpgsql%20tutorial" target="_blank">https://www.google.com/#<u></u>newwindow=1&q=postgres%<u></u>20plpgsql%20tutorial</a><br>
<br>
Read these to get a basic understanding ot plpgsql sripting for stored procedures.<br>
<br>
If you table is big it will take a while. Get this working first and then we can talk about how to speed it up if you need that.<br>
<br>
-Steve<div><br>
<br>
On 3/14/2014 11:00 AM, Carsten Hogertz wrote:<br>
</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>
lol. Now we're talking about the same issue!<br>
I could run n x n queries but this would not be very efficient as I'd<br>
like to have a more "automatic" solution.<br>
<br>
I already thought about function and looping but as being a complete<br>
newbie on looping and writing functions this seems quite hard to solve<br>
for myself.<br>
<br>
Maybe you've got a hint?<br>
<br>
thanks<br>
carsten<br>
<br>
<br>
<br>
2014-03-14 15:53 GMT+01:00 Daniel Kastl <<a href="mailto:daniel@georepublic.de" target="_blank">daniel@georepublic.de</a><br></div>
<mailto:<a href="mailto:daniel@georepublic.de" target="_blank">daniel@georepublic.de</a>><u></u>>:<div><br>
<br>
<br>
<br>
<br>
On Fri, Mar 14, 2014 at 11:42 PM, Carsten Hogertz<br></div><div>
<<a href="mailto:carsten.hogertz@gmail.com" target="_blank">carsten.hogertz@gmail.com</a> <mailto:<a href="mailto:carsten.hogertz@gmail.com" target="_blank">carsten.hogertz@gmail.<u></u>com</a>>> wrote:<br>
<br>
Hi Daniel,<br>
thanks for your eMail.<br>
Well, I think it's not a 1-n calculation. IMHO it's a 1-1<br>
calculation,right?<br>
So I don't know how to calculate the distance for each row of<br>
the routing_pair table.<br>
<br>
<br>
Well, you need to run this query for each row. So with n rows you<br>
need n queries.<br>
If you use standard shortest path function you need to run "n x n"<br>
queries.<br>
<br>
You may want to write a custom function, which makes first a select<br>
of all records in your table and then loops through these records.<br>
Or don't I still understand the problem?<br>
<br>
Daniel<br>
<br>
<br>
<br>
<br>
Thanks<br>
Carsten<br>
<br>
<br>
2014-03-14 15:33 GMT+01:00 Daniel Kastl <<a href="mailto:daniel@georepublic.de" target="_blank">daniel@georepublic.de</a><br></div>
<mailto:<a href="mailto:daniel@georepublic.de" target="_blank">daniel@georepublic.de</a>><u></u>>:<div><br>
<br>
<br>
<br>
<br>
On Fri, Mar 14, 2014 at 11:26 PM, Carsten Hogertz<br>
<<a href="mailto:carsten.hogertz@gmail.com" target="_blank">carsten.hogertz@gmail.com</a><br></div><div><div>
<mailto:<a href="mailto:carsten.hogertz@gmail.com" target="_blank">carsten.hogertz@gmail.<u></u>com</a>>> wrote:<br>
<br>
Maybe to clearify.<br>
<br>
I've got the following two tables:<br>
<br>
Table at_2po_4pgr with the columns:<br>
<br>
id integer NOT NULL,<br>
osm_id bigint,<br>
osm_name character varying,<br>
osm_meta character varying,<br>
osm_source_id bigint,<br>
osm_target_id bigint,<br>
clazz integer,<br>
flags integer,<br>
source integer,<br>
target integer,<br>
km double precision,<br>
kmh integer,<br>
cost2 double precision,<br>
reverse_cost double precision,<br>
x1 double precision,<br>
y1 double precision,<br>
x2 double precision,<br>
y2 double precision,<br>
geom_way geometry(LineString,4326)<br>
<br>
and Table routing_pair with the columns:<br>
<br>
id integer,<br>
h_key integer,<br>
lat_htl double precision,<br>
lon_htl double precision,<br>
source integer,<br>
geom_htl geometry(Point,4326),<br>
lat_bhf double precision,<br>
lon_bhf double precision,<br>
target integer,<br>
geom_bhf geometry(Point,4326)<br>
<br>
<br>
The routing_pair table hold three important information:<br>
ID<br>
SOURCE<br>
TARGET<br>
<br>
All columns are filled (source + target are calculated<br>
from at_2po_4pgr.<br>
<br>
The task seems to be quite simple: I want for each row<br>
from the routing_pair the distance between soure +<br>
target (and if possible its geom).<br>
Could you please help me how to solve this?<br>
<br>
<br>
Hi Carsten,<br>
<br>
There is a function named kDijkstra and it allows you to<br>
calculate all paths from one node to many:<br>
<a href="http://docs.pgrouting.org/2.0/en/src/kdijkstra/doc/index.html#pgr-kdijkstra" target="_blank">http://docs.pgrouting.org/2.0/<u></u>en/src/kdijkstra/doc/index.<u></u>html#pgr-kdijkstra</a><br>
<br>
If something is not clear with the page above, feel free to ask.<br>
<br>
Daniel<br>
<br>
<br>
<br>
<br>
<br>
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