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>Chapter 2. Installation</H1
><P
> Place source tar file in <TT
CLASS="LITERAL"
>contrib</TT
> in the PostgreSQL source
tree and untar it. The shared object for the R call handler is built and
installed in the PostgreSQL library directory via the following commands
(starting from <TT
CLASS="LITERAL"
>/path/to/postgresql_source/contrib</TT
>):
</P><PRE
CLASS="PROGRAMLISTING"
> cd plr
make
make install
</PRE
><P>
</P
><P
> As of PostgreSQL 8.0.0, PL/R can also be built without the PostgreSQL source
tree. Untar PL/R whereever you prefer. The shared object for the R call handler
is built and installed in the PostgreSQL library directory via the following
commands (starting from <TT
CLASS="LITERAL"
>/path/to/plr</TT
>):
</P><PRE
CLASS="PROGRAMLISTING"
> cd plr
USE_PGXS=1 make
USE_PGXS=1 make install
</PRE
><P>
</P
><P
> Win32 - adjust paths according to your own setup, and be sure to restart
the PostgreSQL service after changing:
</P><PRE
CLASS="PROGRAMLISTING"
> In Windows environment:
R_HOME=C:\Progra~1\R\R-2.5.0
Path=%PATH%;C:\Progra~1\R\R-2.5.0\bin
In MSYS:
export R_HOME=/c/progra~1/R/R-2.5.0
export PATH=$PATH:/c/progra~1/PostgreSQL/8.2/bin
USE_PGXS=1 make
USE_PGXS=1 make install
</PRE
><P>
</P
><P
> You can use <TT
CLASS="LITERAL"
>plr.sql</TT
> (which is created in
<TT
CLASS="LITERAL"
>contrib/plr</TT
>) to create the language and support
functions in your database of choice:
</P><PRE
CLASS="PROGRAMLISTING"
> psql mydatabase < plr.sql
</PRE
><P>
Alternatively you can create the language manually using SQL commands:
</P><PRE
CLASS="PROGRAMLISTING"
>CREATE FUNCTION plr_call_handler()
RETURNS LANGUAGE_HANDLER
AS '$libdir/plr' LANGUAGE C;
CREATE LANGUAGE plr HANDLER plr_call_handler;
</PRE
><P>
</P
><P
> As of PostgreSQL 9.1 you can use the new
<TT
CLASS="LITERAL"
>CREATE EXTENSION</TT
> command:
</P><PRE
CLASS="PROGRAMLISTING"
> CREATE EXTENSION plr;
</PRE
><P>
This is not only simple, it has the added advantage of tracking
all PL/R installed objects as dependent on the extension, and
therefore they can be removed just as easily if desired:
</P><PRE
CLASS="PROGRAMLISTING"
> DROP EXTENSION plr;
</PRE
><P>
</P
><DIV
CLASS="TIP"
><BLOCKQUOTE
CLASS="TIP"
><P
><B
>Tip: </B
> If a language is installed into <TT
CLASS="LITERAL"
>template1</TT
>, all
subsequently created databases will have the language installed
automatically.
</P
></BLOCKQUOTE
></DIV
><DIV
CLASS="TIP"
><BLOCKQUOTE
CLASS="TIP"
><P
><B
>Tip: </B
> In addition to the documentation, the <TT
CLASS="LITERAL"
>plr.out.*</TT
> files
in <TT
CLASS="LITERAL"
>plr/expected</TT
> are a good source of usage examples.
</P
></BLOCKQUOTE
></DIV
><DIV
CLASS="TIP"
><BLOCKQUOTE
CLASS="TIP"
><P
><B
>Tip: </B
> R headers are required. Download and install R prior to building PL/R.
R must have been built with the <TT
CLASS="LITERAL"
>--enable-R-shlib</TT
> option
when it was configured, in order for the libR shared object library to be
available.
</P
></BLOCKQUOTE
></DIV
><DIV
CLASS="TIP"
><BLOCKQUOTE
CLASS="TIP"
><P
><B
>Tip: </B
> Additionally, libR must be findable by your runtime linker.
On Linux, this involves adding an entry in /etc/ld.so.conf for the
location of libR (typically $R_HOME/bin or $R_HOME/lib), and then
running ldconfig. Refer to <TT
CLASS="LITERAL"
>man ldconfig</TT
> or its
equivalent for your system.
</P
></BLOCKQUOTE
></DIV
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><BLOCKQUOTE
CLASS="TIP"
><P
><B
>Tip: </B
> R_HOME must be defined in the environment of the user under which
PostgreSQL is started, <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>before</I
></SPAN
> the postmaster
is started. Otherwise PL/R will refuse to load. See plr_environ(),
which allows examination of the environment available to the
PostgreSQL postmaster process.
</P
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