NAME

       dblink_fetch - returns rows from an open cursor in a remote database

SYNOPSIS

       dblink_fetch(text cursorname, int howmany [, bool fail_on_error]) returns setof record
       dblink_fetch(text connname, text cursorname, int howmany [, bool fail_on_error]) returns setof record

DESCRIPTION

           Note
           The following description applies only to Postgres-XC

       dblink module has not been tested with Postges-XC yet. Although there're no reason that
       dblink does not run in Postgres-XC, the development team leaves the test and the use of
       this module entirely to users.

       This section is identical to the corresponding PostgreSQL reference manual.

           Note
           The following description applies only to PostgreSQL

       dblink_fetch fetches rows from a cursor previously established by dblink_open.

ARGUMENTS

       conname

               Note
               The following description applies only to Postgres-XC
           dblink module has not been tested with Postges-XC yet. Although there're no reason
           that dblink does not run in Postgres-XC, the development team leaves the test and the
           use of this module entirely to users.

           This section is identical to the corresponding PostgreSQL reference manual.

               Note
               The following description applies only to PostgreSQL
           Name of the connection to use; omit this parameter to use the unnamed connection.

       cursorname
           The name of the cursor to fetch from.

       howmany
           The maximum number of rows to retrieve. The next howmany rows are fetched, starting at
           the current cursor position, moving forward. Once the cursor has reached its end, no
           more rows are produced.

       fail_on_error
           If true (the default when omitted) then an error thrown on the remote side of the
           connection causes an error to also be thrown locally. If false, the remote error is
           locally reported as a NOTICE, and the function returns no rows.

RETURN VALUE

           Note
           The following description applies only to Postgres-XC

       dblink module has not been tested with Postges-XC yet. Although there're no reason that
       dblink does not run in Postgres-XC, the development team leaves the test and the use of
       this module entirely to users.

       This section is identical to the corresponding PostgreSQL reference manual.

           Note
           The following description applies only to PostgreSQL

       The function returns the row(s) fetched from the cursor. To use this function, you will
       need to specify the expected set of columns, as previously discussed for dblink.

NOTES

           Note
           The following description applies only to Postgres-XC

       dblink module has not been tested with Postges-XC yet. Although there're no reason that
       dblink does not run in Postgres-XC, the development team leaves the test and the use of
       this module entirely to users.

       This section is identical to the corresponding PostgreSQL reference manual.

           Note
           The following description applies only to PostgreSQL

       On a mismatch between the number of return columns specified in the FROM clause, and the
       actual number of columns returned by the remote cursor, an error will be thrown. In this
       event, the remote cursor is still advanced by as many rows as it would have been if the
       error had not occurred. The same is true for any other error occurring in the local query
       after the remote FETCH has been done.

EXAMPLES

           Note
           The following description applies only to Postgres-XC

       dblink module has not been tested with Postges-XC yet. Although there're no reason that
       dblink does not run in Postgres-XC, the development team leaves the test and the use of
       this module entirely to users.

       This section is identical to the corresponding PostgreSQL reference manual.

           Note
           The following description applies only to PostgreSQL

           SELECT dblink_connect('dbname=postgres');
            dblink_connect
           ----------------
            OK
           (1 row)

           SELECT dblink_open('foo', 'select proname, prosrc from pg_proc where proname like ''bytea%''');
            dblink_open
           -------------
            OK
           (1 row)

           SELECT * FROM dblink_fetch('foo', 5) AS (funcname name, source text);
            funcname |  source
           ----------+----------
            byteacat | byteacat
            byteacmp | byteacmp
            byteaeq  | byteaeq
            byteage  | byteage
            byteagt  | byteagt
           (5 rows)

           SELECT * FROM dblink_fetch('foo', 5) AS (funcname name, source text);
            funcname  |  source
           -----------+-----------
            byteain   | byteain
            byteale   | byteale
            bytealike | bytealike
            bytealt   | bytealt
            byteane   | byteane
           (5 rows)

           SELECT * FROM dblink_fetch('foo', 5) AS (funcname name, source text);
             funcname  |   source
           ------------+------------
            byteanlike | byteanlike
            byteaout   | byteaout
           (2 rows)

           SELECT * FROM dblink_fetch('foo', 5) AS (funcname name, source text);
            funcname | source
           ----------+--------
           (0 rows)