Examples of org.h2.result.SearchRow

org.h2.result.SearchRow
The interface for rows stored in a table, and for partial rows stored in the index.

    public Cursor findFirstOrLast(Session session, boolean first) {
        if (first) {
            // TODO optimization: this loops through NULL values
            Cursor cursor = find(session, null, null);
            while (cursor.next()) {
                SearchRow row = cursor.getSearchRow();
                Value v = row.getValue(columnIds[0]);
                if (v != ValueNull.INSTANCE) {
                    return cursor;
                }
            }
            return cursor;
        }
        TreeNode x = root, n;
        while (x != null) {
            n = x.right;
            if (n == null) {
                break;
            }
            x = n;
        }
        TreeCursor cursor = new TreeCursor(this, x, null, null);
        if (x == null) {
            return cursor;
        }
        // TODO optimization: this loops through NULL elements
        do {
            SearchRow row = cursor.getSearchRow();
            if (row == null) {
                break;
            }
            Value v = row.getValue(columnIds[0]);
            if (v != ValueNull.INSTANCE) {
                return cursor;
            }
        } while (cursor.previous());
        return cursor;

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    public Cursor findFirstOrLast(Session session, boolean first) {
        if (first) {
            // TODO optimization: this loops through NULL elements
            Cursor cursor = find(session, null, null);
            while (cursor.next()) {
                SearchRow row = cursor.getSearchRow();
                Value v = row.getValue(firstColumn.getColumnId());
                if (v != ValueNull.INSTANCE) {
                    return cursor;
                }
            }
            return cursor;
        }
        Cursor baseCursor = base.findFirstOrLast(session, false);
        Cursor deltaCursor = delta.findFirstOrLast(session, false);
        MultiVersionCursor cursor = new MultiVersionCursor(session, this, baseCursor, deltaCursor, sync);
        cursor.loadCurrent();
        // TODO optimization: this loops through NULL elements
        while (cursor.previous()) {
            SearchRow row = cursor.getSearchRow();
            if (row == null) {
                break;
            }
            Value v = row.getValue(firstColumn.getColumnId());
            if (v != ValueNull.INSTANCE) {
                return cursor;
            }
        }
        return cursor;

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        }
        int l = 0, r = entryCount;
        int comp = 1;
        while (l < r) {
            int i = (l + r) >>> 1;
            SearchRow row = getRow(i);
            comp = index.compareRows(row, compare);
            if (comp == 0) {
                if (add && index.indexType.isUnique()) {
                    if (!index.containsNullAndAllowMultipleNull(compare)) {
                        throw index.getDuplicateKeyException();

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     *
     * @param at the index
     * @return the row
     */
    SearchRow getRow(int at) {
        SearchRow row = rows[at];
        if (row == null) {
            row = index.readRow(data, offsets[at], onlyPosition, true);
            rows[at] = row;
        } else if (!index.hasData(row)) {
            row = index.readRow(row.getKey());
            rows[at] = row;
        }
        return row;
    }

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    /**
     * Ensure all rows are read in memory.
     */
    protected void readAllRows() {
        for (int i = 0; i < entryCount; i++) {
            SearchRow row = rows[i];
            if (row == null) {
                row = index.readRow(data, offsets[i], onlyPosition, false);
                rows[i] = row;
            }
        }

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            PageBtree page = index.getPage(childPageIds[x]);
            int splitPoint = page.addRowTry(row);
            if (splitPoint == -1) {
                break;
            }
            SearchRow pivot = page.getRow(splitPoint - 1);
            index.getPageStore().logUndo(this, data);
            int splitPoint2 = addChildTry(pivot);
            if (splitPoint2 != -1) {
                return splitPoint2;
            }

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    SearchRow remove(SearchRow row) {
        int at = find(row, false, false, true);
        // merge is not implemented to allow concurrent usage
        // TODO maybe implement merge
        PageBtree page = index.getPage(childPageIds[at]);
        SearchRow last = page.remove(row);
        index.getPageStore().logUndo(this, data);
        updateRowCount(-1);
        written = false;
        changeCount = index.getPageStore().getChangeCount();
        if (last == null) {

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    public void add(Session session, Row row) {
        if (trace.isDebugEnabled()) {
            trace.debug(getName() + " add " + row);
        }
        // safe memory
        SearchRow newRow = getSearchRow(row);
        try {
            addRow(newRow);
        } finally {
            store.incrementChangeCount();
        }

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                break;
            }
            if (trace.isDebugEnabled()) {
                trace.debug("split " + splitPoint);
            }
            SearchRow pivot = root.getRow(splitPoint - 1);
            store.logUndo(root, root.data);
            PageBtree page1 = root;
            PageBtree page2 = root.split(splitPoint);
            store.logUndo(page2, null);
            int id = store.allocatePage();

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     *
     * @param row the row
     * @return the search row
     */
    private SearchRow getSearchRow(Row row) {
        SearchRow r = table.getTemplateSimpleRow(columns.length == 1);
        r.setKeyAndVersion(row);
        for (int j = 0; j < columns.length; j++) {
            int idx = columns[j].getColumnId();
            r.setValue(idx, row.getValue(idx));
        }
        return r;
    }

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