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LEARN ABOUT CENTOS

dblink_open

DBLINK_OPEN(3)						  PostgreSQL 9.2.7 Documentation					    DBLINK_OPEN(3)

NAME

       dblink_open - opens a cursor in a remote database

SYNOPSIS

       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

DESCRIPTION

       dblink_open() opens a cursor in a remote database. The cursor can subsequently be manipulated with dblink_fetch() and dblink_close().

ARGUMENTS

       conname
	   Name of the connection to use; omit this parameter to use the unnamed connection.

       cursorname
	   The name to assign to this cursor.

       sql
	   The SELECT statement that you wish to execute in the remote database, for example select * from pg_class.

       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's return value is set to ERROR.

RETURN VALUE

       Returns status, either OK or ERROR.

NOTES

       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.

EXAMPLES

	   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)

PostgreSQL 9.2.7						    2014-02-17							    DBLINK_OPEN(3)

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