dblink_error_message — gets last error message on the named connection
dblink_error_message(text connname) returns text
dblink_error_message fetches the most recent remote error message for a given connection.
Name of the connection to use.
Returns last error message, or
OK if there has been no error in this connection.
When asynchronous queries are initiated by
dblink_send_query, the error message associated with the connection might not get updated until the server's response message is consumed. This typically means that
dblink_get_result should be called prior to
dblink_error_message, so that any error generated by the asynchronous query will be visible.
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