I have tried the PostgreSQL perl extension. It is quite nifty for small tasks like some text transformations (where Perl is really great while PL style languages are a bit primitive), but the connectivity to the whole data is a bit restricted. PL/pgSQL can access all the tables in a quite natural manner - by name, Perl subroutines currently can act only as mathematical functions - transforming the parameters into the return value, they have not access to the database tables. This should change since there is an iniciative to build a DBD style library for plperl, but it seems that it still will not be as natural as for a PL style language. Another restriction is that perl subroutines cannot call PL/pgSQL.
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