PostgreSQL/PostGIS Views Containing Spatial Data
Single Table Views
A dynamic Overlay can be created SIS Desktop 9.1 from a a PostgreSQL/PostGIS view based on a single table.
Multiple Table Views
An overlay can be created in SIS Desktop 9.1 from a a PostgreSQL/PostGIS view based on multiple tables that have been joined.
Editing Views
Overlays created in SIS Desktop 9.1 from PostGIS views are not editable.
Registering Views
Once a view has been created it needs to be registered in the ‘Geometry_columns’ table.
Requirements
Ensure that a primary key is a part of the view definition.
Examples of Creating Views
View based on a single table using a spatial ‘WHERE’ clause to restrict data:
CREATE OR REPLACE VIEW v_bedwell AS
SELECT stevenage220610.feature_id, stevenage220610.toid,
stevenage220610.label_text, stevenage220610.label_height,
stevenage220610.label_orientation,
stevenage220610.label_alignment,
stevenage220610.symbol_orientation,
stevenage220610.sis_fc,
stevenage220610.geometry
FROM stevenage220610
WHERE stevenage220610.geometry
&& setsrid('BOX3D(523840 223241 0,525288 224639 0)'::box3d::geometry, 27700);
View based on a single table using an attribute ‘WHERE’ clause to restrict data:
CREATE view v_stev_houses as select
a.GEOMETRY,a.FEATURE_ID,a.TOID,a.DESCRIPTIVE_GROUPS,
a.lABEL_TEXT,a.LABEL_HEIGHT,a.LABEL_ORIENTATION,
a.LABEL_ALIGNMENT,a.SYMBOL_ORIENTATION,a.SIS_FC from sTEVENAGE220610 a
where sis_fc= 10021
and a.geometry && setsrid('BOX3D(523840 223241 0,525288 224639 0)'::box3d::geometry,27700);
View based on two tables:
CREATE view v_stev_join as select
a.GEOMETRY,a.FEATURE_ID,a.TOID,a.FEATURE_CODE,a.lABEL_TEXT,
a.LABEL_HEIGHT,a.LABEL_ORIENTATION,a.LABEL_ALIGNMENT,
a.SYMBOL_ORIENTATION, a.SIS_FC,
b.toid as b_toid,
b.descriptive_groups b_descriptive_groups
from stevenage220610 a, stevenage_data b
where a.TOID = b.toid