dblink_disconnect
Name
dblink_disconnect -- closes a persistent connection to a remote database
Synopsis
    dblink_disconnect() returns text
    dblink_disconnect(text connname) returns text
   Description
    dblink_disconnect() closes a connection previously opened
    by dblink_connect().  The form with no arguments closes
    an unnamed connection.
   
Arguments
- conname
-        The name of a named connection to be closed.
       
Return Value
    Returns status, which is always OK (since any error
    causes the function to throw an error instead of returning).
   
Example
 test=# select dblink_disconnect();
  dblink_disconnect
 -------------------
  OK
 (1 row)
 select dblink_disconnect('myconn');
  dblink_disconnect
 -------------------
  OK
 (1 row)