spec_result_clear_result
dbClearResult() returns TRUE, invisibly, for result sets obtained from
both dbSendQuery()
and dbSendStatement().
An attempt to close an already closed result set issues a warning in both cases.
dbClearResult() frees all resources associated with retrieving
the result of a query or update operation.
The DBI backend can expect a call to dbClearResult() for each
dbSendQuery() or dbSendStatement() call.
Other result specifications:
spec_result_create_table_with_data_type,
spec_result_execute,
spec_result_fetch,
spec_result_get_query,
spec_result_roundtrip,
spec_result_send_query,
spec_result_send_statement