int DB->cursor(DB *db, DB_TXN *txnid, DBC **cursorp, u_int32_t flags);
The DB->cursor method creates a cursor and copies a pointer to it into the memory to which cursorp refers.
If the operation is to be transaction-protected, the txnid parameter is a transaction handle returned from DB_ENV->txn_begin; otherwise, NULL.
To transaction-protect cursor operations, cursors must be opened and closed within the context of a transaction, and the txnid parameter specifies the transaction context in which the cursor may be used.
The flags value must be set to 0 or by bitwise inclusively OR'ing together one or more of the following values:
The DB->cursor method returns a non-zero error value on failure and 0 on success.
The DB->cursor method may fail and return a non-zero error for the following conditions:
The DB->cursor 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->cursor 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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