int DB->get_type(DB *db, DBTYPE *type);
The DB->get_type method stores the type of the underlying access method (and file format) into the memory referenced by type. The returned value is one of DB_BTREE, DB_HASH, DB_RECNO, or DB_QUEUE. This value may be used to determine the type of the database after a return from DB->open with the type argument set to DB_UNKNOWN.
The DB->get_type interface may not be called before the DB->open interface has been called.
The DB->get_type method may fail and return a non-zero error for the following conditions:
Called before DB->open was called.
The DB->get_type method may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions. If a catastrophic error has occurred, the DB->get_type method may fail and return DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.
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