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>Chapter 1. Overview</H1
><P
> PL/R is a loadable procedural language that enables you to write
PostgreSQL functions and triggers in the
<A
HREF="http://www.r-project.org/"
TARGET="_top"
>R programming language</A
>.
PL/R offers most (if not all) of the capabilities a function writer has
in the R language.
</P
><P
> Commands are available to access the database via the PostgreSQL Server
Programming Interface (SPI) and to raise messages via <CODE
CLASS="FUNCTION"
>elog()
</CODE
>. There is no way to access internals of the database backend.
However the user is able to gain OS-level access under the permissions of
the PostgreSQL user ID, as with a C function. Thus, any unprivileged
database user should not be permitted to use this language. It
<SPAN
CLASS="emphasis"
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>must be installed as an untrusted procedural language</I
></SPAN
>
so that only database superusers can create functions in it. The writer of
a <SPAN
CLASS="APPLICATION"
>PL/R</SPAN
> function must take care that the function
cannot be used to do anything unwanted, since it will be able to do
anything that could be done by a user logged in as the database
administrator.
</P
><P
> An implementation restriction is that PL/R procedures cannot be used to
create input/output functions for new data types.
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