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add second example of usage of bbox token for customization of placement of the geometry query in the PostGIS plugin

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Dane Springmeyer 2011-01-08 01:14:35 +00:00
parent c027a4d72b
commit 9cf0a8deca
1 changed files with 10 additions and 2 deletions
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@ -89,13 +89,21 @@ Mapnik 0.7.0 Release
in cases where the subquery limits results, provide a faster and more accurate layer extent. It will have in cases where the subquery limits results, provide a faster and more accurate layer extent. It will have
no effect if the 'table' parameter is simply an existing table. This parameter is false by default. (#456) no effect if the 'table' parameter is simply an existing table. This parameter is false by default. (#456)
- PostGIS Plugin: Added 'bbox' token substitution ability in sql query string. This opens the door for various - PostGIS Plugin: Added '!bbox!' token substitution ability in sql query string. This opens the door for various
complex queries that may aggregate geometries to be kept fast by allowing proper placement of the bbox complex queries that may aggregate geometries to be kept fast by allowing proper placement of the bbox
query to be used by indexes. (#415) query to be used by indexes. (#415)
* Pass the bbox token inside a subquery like: !bbox! * Pass the bbox token inside a subquery like: !bbox!
* e.g. (Select ST_Union(geom) as geom from table where ST_Intersects(geometry,!bbox!)) as map * Valid Usages include:
<Parameter name="table">
(Select ST_Union(geom) as geom from table where ST_Intersects(geometry,!bbox!)) as map
</Parameter>
<Parameter name="table">
(Select * from table where geom &amp;&amp; !bbox!) as map
</Parameter>
- PostGIS Plugin: Added 'scale_denominator' substitution ability in sql query string (#415/#465) - PostGIS Plugin: Added 'scale_denominator' substitution ability in sql query string (#415/#465)