Initializing Database Handles

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Before a database handle can be used to attach to a database, it must be set to zero. The following code illustrates how two database handles are set to zero:

#include <ibase.h>
. . .
isc_db_handle db1;
isc_db_handle db2;
. . .
/* Set database handles to zero before attaching to a database. */
db1 = 0L;
db2 = 0L;

Once a database handle is initialized to zero, it can be used in a call to ­isc_attach_database() to establish a database connection. If a nonzero database handle is passed to isc_attach_database(), the connection fails and an error code is returned. For more information about establishing a database connection with ­isc_attach_database(), see