2.8 Errors and warnings

ODBC operations return success, error or‘success with info’. This section explains how results from the ODBC layer are reported to Prolog.

2.8.1 ODBC messages:‘Success with info’

If an ODBC operation returns‘with info’, the info is extracted from the interface and handled to the Prolog message dispatcher print_message/2. The level of the message is informational and the term is of the form:

odbc(State, Native, Message)

Here, State is the SQL-state as defined in the ODBC API, Native is the (integer) error code of the underlying data source and Message is a human readable explanation of the message.

2.8.2 ODBC errors

If an ODBC operation signals an error, it throws the exception error(odbc(State, Native, Message), _). The arguments of the odbc/3 term are explained in section 2.8.1.

In addition, the Prolog layer performs the normal tests for proper arguments and state, signaling the conventional instantiation, type, domain and resource exceptions.