DropRasterConstraints

Name

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.

Synopsis

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=false , 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 ) ;

Description

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

Examples

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 |         |         |             |             |           |             |