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><H1
><A
NAME="SQL-ALTERFOREIGNDATAWRAPPER"
></A
>ALTER FOREIGN DATA WRAPPER</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN63229"
></A
><H2
>Name</H2
>ALTER FOREIGN DATA WRAPPER -- change the definition of a foreign-data wrapper</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN63234"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>ALTER FOREIGN DATA WRAPPER <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
>
[ HANDLER <TT
CLASS="REPLACEABLE"
><I
>handler_function</I
></TT
> | NO HANDLER ]
[ VALIDATOR <TT
CLASS="REPLACEABLE"
><I
>validator_function</I
></TT
> | NO VALIDATOR ]
[ OPTIONS ( [ ADD | SET | DROP ] <TT
CLASS="REPLACEABLE"
><I
>option</I
></TT
> ['<TT
CLASS="REPLACEABLE"
><I
>value</I
></TT
>'] [, ... ]) ]
ALTER FOREIGN DATA WRAPPER <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> OWNER TO <TT
CLASS="REPLACEABLE"
><I
>new_owner</I
></TT
>
ALTER FOREIGN DATA WRAPPER <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> RENAME TO <TT
CLASS="REPLACEABLE"
><I
>new_name</I
></TT
></PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN63245"
></A
><H2
>Description</H2
><P
> <TT
CLASS="COMMAND"
>ALTER FOREIGN DATA WRAPPER</TT
> changes the
definition of a foreign-data wrapper. The first form of the
command changes the support functions or the generic options of the
foreign-data wrapper (at least one clause is required). The second
form changes the owner of the foreign-data wrapper.
</P
><P
> Only superusers can alter foreign-data wrappers. Additionally,
only superusers can own foreign-data wrappers.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN63250"
></A
><H2
>Parameters</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
></DT
><DD
><P
> The name of an existing foreign-data wrapper.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>HANDLER <TT
CLASS="REPLACEABLE"
><I
>handler_function</I
></TT
></TT
></DT
><DD
><P
> Specifies a new handler function for the foreign-data wrapper.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>NO HANDLER</TT
></DT
><DD
><P
> This is used to specify that the foreign-data wrapper should no
longer have a handler function.
</P
><P
> Note that foreign tables that use a foreign-data wrapper with no
handler cannot be accessed.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>VALIDATOR <TT
CLASS="REPLACEABLE"
><I
>validator_function</I
></TT
></TT
></DT
><DD
><P
> Specifies a new validator function for the foreign-data wrapper.
</P
><P
> Note that it is possible that after changing the validator the
options to the foreign-data wrapper, servers, and user mappings
have become invalid. It is up to the user to make sure that
these options are correct before using the foreign-data
wrapper.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>NO VALIDATOR</TT
></DT
><DD
><P
> This is used to specify that the foreign-data wrapper should no
longer have a validator function.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>OPTIONS ( [ ADD | SET | DROP ] <TT
CLASS="REPLACEABLE"
><I
>option</I
></TT
> ['<TT
CLASS="REPLACEABLE"
><I
>value</I
></TT
>'] [, ... ] )</TT
></DT
><DD
><P
> Change options for the foreign-data
wrapper. <TT
CLASS="LITERAL"
>ADD</TT
>, <TT
CLASS="LITERAL"
>SET</TT
>, and <TT
CLASS="LITERAL"
>DROP</TT
>
specify the action to be performed. <TT
CLASS="LITERAL"
>ADD</TT
> is assumed
if no operation is explicitly specified. Option names must be
unique; names and values are also validated using the foreign
data wrapper's validator function, if any.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>new_owner</I
></TT
></DT
><DD
><P
> The user name of the new owner of the foreign-data wrapper.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>new_name</I
></TT
></DT
><DD
><P
> The new name for the foreign-data wrapper.
</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN63303"
></A
><H2
>Examples</H2
><P
> Change a foreign-data wrapper <TT
CLASS="LITERAL"
>dbi</TT
>, add
option <TT
CLASS="LITERAL"
>foo</TT
>, drop <TT
CLASS="LITERAL"
>bar</TT
>:
</P><PRE
CLASS="PROGRAMLISTING"
>ALTER FOREIGN DATA WRAPPER dbi OPTIONS (ADD foo '1', DROP 'bar');</PRE
><P>
</P
><P
> Change the foreign-data wrapper <TT
CLASS="LITERAL"
>dbi</TT
> validator
to <TT
CLASS="LITERAL"
>bob.myvalidator</TT
>:
</P><PRE
CLASS="PROGRAMLISTING"
>ALTER FOREIGN DATA WRAPPER dbi VALIDATOR bob.myvalidator;</PRE
><P></P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN63314"
></A
><H2
>Compatibility</H2
><P
> <TT
CLASS="COMMAND"
>ALTER FOREIGN DATA WRAPPER</TT
> conforms to ISO/IEC
9075-9 (SQL/MED), except that the <TT
CLASS="LITERAL"
>HANDLER</TT
>,
<TT
CLASS="LITERAL"
>VALIDATOR</TT
>, <TT
CLASS="LITERAL"
>OWNER TO</TT
>, and <TT
CLASS="LITERAL"
>RENAME</TT
>
clauses are extensions.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN63322"
></A
><H2
>See Also</H2
><A
HREF="sql-createforeigndatawrapper.html"
>CREATE FOREIGN DATA WRAPPER</A
>, <A
HREF="sql-dropforeigndatawrapper.html"
>DROP FOREIGN DATA WRAPPER</A
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