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Postgisify an exisiting database
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If you want to install the GeoEngine on an existing database, you have to run the sql commands available in the  base_geoengine module under the postgis_sql folder using a PostgreSQL super user::

 psql -U superuser my database -f postgis.sql
 psql -U superuser my database -f spatial_ref_sys.sql

In order to test if the installation is sucessfull log into you database and::

 SELECT * from GEOMETRY_COLUMNS;
 SELECT * from spatial_ref_sys;