dblink_error_message
Name
dblink_error_message -- gets last error message on the named connection
Synopsis
dblink_error_message(text connname) returns text
Description
    dblink_error_message fetches the most recent remote
    error message for a given connection.
   
Arguments
- conname
-        Name of the connection to use.
       
Return Value
    Returns last error message, or an empty string if there has been
    no error in this connection.
   
Examples
SELECT dblink_error_message('dtest1');