Line to Poly

Question

In 10g is there a simple way to convert a line string with the same start and end point to a polygon? I have a table with a large amount of data and want to find a fast way to convert.

Answer 1

Here is one way, but you have to pay attention to the assumptions:
They are all single line strings
They all have the same start and end point
They are all defined with counter clockwise rotation
They are all two dimensional
They are not self crossing line strings
Then:
drop the spatial index
update mytable a set a.geom_column.sdo_gtype=2003;
update mytable a set a.geom.sdo_elem_info=mdsys.sdo_elem_info_array(1,1003,1);
commit;
recreate the spatial index (use layer_gtype=polygon)
If they are not all defined with counter-clockwise rotation:
drop the spatial index
update mytable a set a.geom_column.sdo_gtype=3;
update mytable a set a.geom.sdo_elem_info=mdsys.sdo_elem_info_array(1,3,1);
commit;
execute sdo_migrate.to_current('table_name','column_name');
recreate the spatial index
As the complexity goes up, it will no longer be possible to do this with simple sql, and you will need pl/sql routines. In any event, it shouldn't be too difficult.