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>Appendix F. Additional Supplied Modules</TD
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><H1
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><A
NAME="FILE-FDW"
>F.14. file_fdw</A
></H1
><P
> The <TT
CLASS="FILENAME"
>file_fdw</TT
> module provides the foreign-data wrapper
<CODE
CLASS="FUNCTION"
>file_fdw</CODE
>, which can be used to access data
files in the server's file system. Data files must be in a format
that can be read by <TT
CLASS="COMMAND"
>COPY FROM</TT
>;
see <A
HREF="sql-copy.html"
>COPY</A
> for details.
</P
><P
> A foreign table created using this wrapper can have the following options:
</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="LITERAL"
>filename</TT
></DT
><DD
><P
> Specifies the file to be read. Required. Must be an absolute path name.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>format</TT
></DT
><DD
><P
> Specifies the file's format,
the same as <TT
CLASS="COMMAND"
>COPY</TT
>'s <TT
CLASS="LITERAL"
>FORMAT</TT
> option.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>header</TT
></DT
><DD
><P
> Specifies whether the file has a header line,
the same as <TT
CLASS="COMMAND"
>COPY</TT
>'s <TT
CLASS="LITERAL"
>HEADER</TT
> option.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>delimiter</TT
></DT
><DD
><P
> Specifies the file's delimiter character,
the same as <TT
CLASS="COMMAND"
>COPY</TT
>'s <TT
CLASS="LITERAL"
>DELIMITER</TT
> option.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>quote</TT
></DT
><DD
><P
> Specifies the file's quote character,
the same as <TT
CLASS="COMMAND"
>COPY</TT
>'s <TT
CLASS="LITERAL"
>QUOTE</TT
> option.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>escape</TT
></DT
><DD
><P
> Specifies the file's escape character,
the same as <TT
CLASS="COMMAND"
>COPY</TT
>'s <TT
CLASS="LITERAL"
>ESCAPE</TT
> option.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>null</TT
></DT
><DD
><P
> Specifies the file's null string,
the same as <TT
CLASS="COMMAND"
>COPY</TT
>'s <TT
CLASS="LITERAL"
>NULL</TT
> option.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>encoding</TT
></DT
><DD
><P
> Specifies the file's encoding.
the same as <TT
CLASS="COMMAND"
>COPY</TT
>'s <TT
CLASS="LITERAL"
>ENCODING</TT
> option.
</P
></DD
></DL
></DIV
><P
> <TT
CLASS="COMMAND"
>COPY</TT
>'s <TT
CLASS="LITERAL"
>OIDS</TT
>, <TT
CLASS="LITERAL"
>FORCE_QUOTE</TT
>,
and <TT
CLASS="LITERAL"
>FORCE_NOT_NULL</TT
> options are currently not supported by
<TT
CLASS="LITERAL"
>file_fdw</TT
>.
</P
><P
> These options can only be specified for a foreign table, not in the
options of the <TT
CLASS="LITERAL"
>file_fdw</TT
> foreign-data wrapper, nor in the
options of a server or user mapping using the wrapper.
</P
><P
> Changing table-level options requires superuser privileges, for security
reasons: only a superuser should be able to determine which file is read.
In principle non-superusers could be allowed to change the other options,
but that's not supported at present.
</P
><P
> For a foreign table using <TT
CLASS="LITERAL"
>file_fdw</TT
>, <TT
CLASS="COMMAND"
>EXPLAIN</TT
> shows
the name of the file to be read. Unless <TT
CLASS="LITERAL"
>COSTS OFF</TT
> is
specified, the file size (in bytes) is shown as well.
</P
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