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Berkeley DB: Db.cursor
Db.cursor
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import com.sleepycat.db.*;
public Dbc cursor(DbTxn txnid, int flags)
throws DbException;
Description
The Db.cursor method
creates a cursor.
If the operation is to be transaction-protected, the txnid
parameter is a transaction handle returned from DbEnv.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:
- Db.DB_DIRTY_READ
- All read operations performed by the cursor may return modified but not
yet committed data. Silently ignored if the Db.DB_DIRTY_READ flag
was not specified when the underlying database was opened.
- Db.DB_WRITECURSOR
- Specify that the cursor will be used to update the database. The
underlying database environment must have been opened using the
Db.DB_INIT_CDB flag.
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.
Class
Db
See Also
Db.associate,
Db.close,
Db.cursor,
Db.del,
Db.fd,
Db.get,
Db.pget,
Db.get_byteswapped,
Db.get_type,
Db.join,
Db.key_range,
Db.open,
Db.put,
Db.remove,
Db.rename,
Db.set_append_recno,
Db.set_bt_minkey,
Db.set_cachesize,
Db.set_errcall,
Db.set_errpfx,
Db.set_feedback,
Db.set_flags,
Db.set_h_ffactor,
Db.set_h_nelem,
Db.set_lorder,
Db.set_pagesize,
Db.set_q_extentsize,
Db.set_re_delim,
Db.set_re_len,
Db.set_re_pad,
Db.set_re_source,
Db.stat,
Db.sync,
Db.truncate,
Db.upgrade,
and
Db.verify.
Copyright Sleepycat Software
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