Initializing Transaction Handles
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Before a transaction handle can be used to start a new transaction, it must be set to zero. The following code illustrates how two transaction handles are set to zero:
#include <ibase.h> . . . isc_tr_handle tr1; isc_tr_handle tr2; . . . /* Set transaction handles to zero before starting a transaction. */ tr1 = 0L; tr2 = 0L;
Once a transaction handle is initialized to zero, it can be used in a call to isc_start_transaction() to establish a new transaction. If a nonzero transaction handle is passed to isc_start_transaction(), the startup fails and an error code is returned.