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>Chapter 10. Loading R Modules at Startup</H1
><P
> PL/R has support for auto-loading R code during interpreter
initialization. It uses a special table, <TT
CLASS="LITERAL"
>plr_modules</TT
>,
which is presumed to contain modules of R code. If this table exists, the
modules defined are fetched from the table and loaded into the R
interpreter immediately after creation.
</P
><P
> The definition of the table <TT
CLASS="LITERAL"
>plr_modules</TT
> is as follows:
</P><PRE
CLASS="PROGRAMLISTING"
>CREATE TABLE plr_modules (
modseq int4,
modsrc text
);
</PRE
><P>
The field <TT
CLASS="LITERAL"
>modseq</TT
> is used to control the order of
installation. The field <TT
CLASS="LITERAL"
>modsrc</TT
> contains the full text
of the R code to be executed, including assignment if that is desired.
Consider, for example, the following statement:
</P><PRE
CLASS="PROGRAMLISTING"
>INSERT INTO plr_modules
VALUES (0, 'pg.test.module.load <-function(msg) {print(msg)}');
</PRE
><P>
This statement will cause an R function named <CODE
CLASS="FUNCTION"
>pg.test.module.load
</CODE
> to be created in the R interpreter on initialization. A PL/R
function may now simply reference the function directly as follows:
</P><PRE
CLASS="PROGRAMLISTING"
>create or replace function pg_test_module_load(text) returns text as '
pg.test.module.load(arg1)
' language 'plr';
select pg_test_module_load('hello world');
pg_test_module_load
---------------------
hello world
(1 row)
</PRE
><P>
</P
><P
> The table <TT
CLASS="LITERAL"
>plr_modules</TT
> must be readable by all,
but it is wise to make it owned and writable only by the database
administrator.
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