Examples of com.sleepycat.bdb.DataCursor

com.sleepycat.bdb.DataCursor
(internal) Represents a Berkeley DB cursor and adds support for indices, bindings and key ranges.
NOTE: This classes is internal and may be changed incompatibly or deleted in the future. It is public only so it may be used by subpackages.

This class operates on a view and takes care of reading and updating indices, calling bindings, constraining access to a key range, etc.
@author Mark Hayes

                    // CDB restriction that append may not be called with a
                    // cursor open; note the append will still fail if the
                    // application has another cursor open
                    close();
                    err = coll.view.append(value, null, null);
                    cursor = new DataCursor(coll.view, writeAllowed);
                    reset();
                    next(); // move past new record
                } else { // hash/btree with duplicates
                    throw new IllegalStateException(
                        "Collection is empty, cannot add() duplicate");

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        }
    }


    final boolean removeKey(final Object key, final Object[] oldVal) {


        DataCursor cursor = null;
        boolean doAutoCommit = beginAutoCommit();
        try {
            cursor = new DataCursor(view, true);
            boolean found = false;
            int err = cursor.get(key, null, Db.DB_SET, true);
            while (err == 0) {
                cursor.delete();
                found = true;
                if (oldVal != null && oldVal[0] == null)
                    oldVal[0] = cursor.getCurrentValue();
                err = cursor.get(null, null, Db.DB_NEXT_DUP, true);
            }
            closeCursor(cursor);
            commitAutoCommit(doAutoCommit);
            return found;
        } catch (Exception e) {

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        }
    }


    boolean containsKey(Object key) {


        DataCursor cursor = null;
        try {
            cursor = new DataCursor(view, false);
            int err = cursor.get(key, null, Db.DB_SET, false);
            return (err == 0);
        } catch (Exception e) {
            throw StoredContainer.convertException(e);
        } finally {
            closeCursor(cursor);

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        }
    }


    final boolean removeValue(Object value) {


        DataCursor cursor = null;
        boolean doAutoCommit = beginAutoCommit();
        try {
            cursor = new DataCursor(view, true);
            int err = cursor.find(value, true);
            if (err == 0) {
                cursor.delete();
            }
            closeCursor(cursor);
            commitAutoCommit(doAutoCommit);
            return (err == 0);
        } catch (Exception e) {

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        }
    }


    boolean containsValue(Object value) {


        DataCursor cursor = null;
        try {
            cursor = new DataCursor(view, false);
            int err = cursor.find(value, true);
            return (err == 0);
        } catch (Exception e) {
            throw StoredContainer.convertException(e);
        } finally {
            closeCursor(cursor);

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        try {
            DataView[] indexViews = new DataView[indices.length];
            for (int i = 0; i < indices.length; i += 1) {
                indexViews[i] = indices[i].view;
            }
            DataCursor cursor = view.join(indexViews, indexKeys, presorted);
            return new StoredIterator(this, false, cursor);
        } catch (Exception e) {
            throw StoredContainer.convertException(e);
        }
    }

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        }
    }


    final Object getFirstOrLast(boolean doGetFirst) {


        DataCursor cursor = null;
        try {
            cursor = new DataCursor(view, false);
            int err = cursor.get(null, null,
                                 doGetFirst ? Db.DB_FIRST : Db.DB_LAST,
                                 false);
            return (err == 0) ? makeIteratorData(null, cursor) : null;
        } catch (Exception e) {
            throw StoredContainer.convertException(e);

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Related Classes of com.sleepycat.bdb.DataCursor

com.sleepycat.bdb.collection.StoredCollection

com.sleepycat.bdb.collection.StoredContainer

com.sleepycat.bdb.collection.StoredEntrySet

com.sleepycat.bdb.collection.StoredIterator

com.sleepycat.bdb.collection.StoredList

com.sleepycat.bdb.collection.StoredSortedMap

com.sleepycat.bdb.collection.StoredValueSet

com.sleepycat.bdb.test.KeyRangeTest

com.sleepycat.db.Dbc

com.sleepycat.db.Dbt

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