public Dbc cursor(DbTxn txnid, int flags)
throws DbException;
Description
The Db.cursor method
creates a cursor.
If the file is being accessed under transaction protection, the
txnid parameter is a transaction ID returned from
DbEnv.txn_begin, otherwise, NULL.
If transaction protection is enabled, 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.
Specify that the cursor will be used to update the database. This
flag should only be set when the Db.DB_INIT_CDB flag
was specified to DbEnv.open.
The Db.cursor method throws an exception that encapsulates a non-zero error value on
failure.
Errors
The Db.cursor method may fail and throw an exception encapsulating a non-zero error for the following conditions:
EINVAL
An invalid flag value or parameter was specified.
The Db.cursor method may fail and throw an exception for errors specified for other Berkeley DB and C library or system methods.
If a catastrophic error has occurred, the Db.cursor method may fail and throw
a DbRunRecoveryException, in which case all subsequent Berkeley DB calls
will fail in the same way.