This function initializes the database interface library. This function must be called before any other library call is made
and before any embedded SQL statement is executed. The resources the interface library required for your program are allocated
and initialized on this call.
Returns 1 if successful, 0 otherwise.
Use db_fini to free the resources at the end of your program. If there are any errors during processing, they are returned
in the SQLCA and 0 is returned. If there are no errors, a non-zero value is returned and you can begin using embedded SQL
statements and functions.
Usually, this function should be called only once (passing the address of the global sqlca variable defined in the sqlca.h header file). If you are writing a DLL or an application that has multiple threads using embedded SQL, call db_init once
for each SQLCA that is being used.