dblink_open(text cursorname, text sql [, bool fail_on_error]) returns text dblink_open(text connname, text cursorname, text sql [, bool fail_on_error]) returns text
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_open() opens a cursor in a remote database.
The cursor can subsequently be manipulated with
dblink_fetch() and dblink_close().
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.
The name to assign to this cursor.
The SELECT statement that you wish to execute in the remote database, for example select * from pg_class.
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's return value is set to ERROR.
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
Returns status, either OK or ERROR.
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
Since a cursor can only persist within a transaction,
dblink_open starts an explicit transaction block
(BEGIN) on the remote side, if the remote side was
not already within a transaction. This transaction will be
closed again when the matching dblink_close is
executed. Note that if
you use dblink_exec to change data between
dblink_open and dblink_close,
and then an error occurs or you use dblink_disconnect before
dblink_close, your change will be
lost because the transaction will be aborted.
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');
dblink_open
-------------
OK
(1 row)