You Must Declare Database Handles

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A database handle must be declared and initialized to zero before use. The following code illustrates how to declare and initialize a database handle:

#include <ibase.h>
. . .
/* Declare a database handle. */
isc_db_handle db1;
. . .
/* Initialize the handle. */
db1 = 0L;

For more information about declaring, initializing, and using database handles, see Working with Databases.