DropRasterConstraints — Drops PostGIS raster constraints that refer to a raster table column. Useful if you need to reload data or update your raster column data.
boolean DropRasterConstraints(name
rasttable, name
rastcolumn, boolean
srid, boolean
scale_x, boolean
scale_y, boolean
blocksize_x, boolean
blocksize_y, boolean
same_alignment, boolean
regular_blocking, boolean
num_bands=true, boolean
pixel_types=true, boolean
nodata_values=true, boolean
out_db=true
, boolean
extent=true);
boolean DropRasterConstraints(name
rastschema, name
rasttable, name
rastcolumn, boolean
srid=true, boolean
scale_x=true, boolean
scale_y=true, boolean
blocksize_x=true, boolean
blocksize_y=true, boolean
same_alignment=true, boolean
regular_blocking=true, boolean
num_bands=true, boolean
pixel_types=true, boolean
nodata_values=true, boolean
out_db=true
, boolean
extent=true);
boolean DropRasterConstraints(name
rastschema, name
rasttable, name
rastcolumn, text[]
constraints);
Drops PostGIS raster constraints that refer to a raster table column that were added by AddRasterConstraints. Useful if you need to load more data or update your raster column data. You do not need to do this if you want to get rid of a raster table or a raster column.
To drop a raster table use the standard
DROP TABLE mytable
To drop just a raster column and leave the rest of the table, use standard SQL
ALTER TABLE mytable DROP COLUMN rast
the table will disappear from the raster_columns catalog if the column or table is dropped. However if only the constraints are dropped, the
raster column will still be listed in the raster_columns catalog, but there will be no other information about it aside from the column name and table.
Availability: 2.0.0
SELECT DropRasterConstraints ('myrasters','rast');
----RESULT output ---
t
-- verify change in raster_columns --
SELECT srid, scale_x, scale_y, blocksize_x, blocksize_y, num_bands, pixel_types, nodata_values
FROM raster_columns
WHERE r_table_name = 'myrasters';
srid | scale_x | scale_y | blocksize_x | blocksize_y | num_bands | pixel_types| nodata_values
------+---------+---------+-------------+-------------+-----------+-------------+---------------
0 | | | | | | |