Examples with Page org.h2.store.Page used on opensource projects

Example 41 with Page

use of org.h2.store.Page in project h2database by h2database.

the class PageStore method readStaticHeader.

private void readStaticHeader() {
    file.seek(FileStore.HEADER_LENGTH);
    Data page = Data.create(database, new byte[PAGE_SIZE_MIN - FileStore.HEADER_LENGTH]);
    file.readFully(page.getBytes(), 0, PAGE_SIZE_MIN - FileStore.HEADER_LENGTH);
    readCount++;
    setPageSize(page.readInt());
    int writeVersion = page.readByte();
    int readVersion = page.readByte();
    if (readVersion > READ_VERSION) {
        throw DbException.get(ErrorCode.FILE_VERSION_ERROR_1, fileName);
    }
    if (writeVersion > WRITE_VERSION) {
        close();
        database.setReadOnly(true);
        accessMode = "r";
        file = database.openFile(fileName, accessMode, true);
    }
}

Example 42 with Page

use of org.h2.store.Page in project h2database by h2database.

the class PageBtreeIndex method getRowSize.

/**
 * Get the size of a row (only the part that is stored in the index).
 *
 * @param dummy a dummy data page to calculate the size
 * @param row the row
 * @param onlyPosition whether only the position of the row is stored
 * @return the number of bytes
 */
int getRowSize(Data dummy, SearchRow row, boolean onlyPosition) {
    int rowsize = Data.getVarLongLen(row.getKey());
    if (!onlyPosition) {
        for (Column col : columns) {
            Value v = row.getValue(col.getColumnId());
            rowsize += dummy.getValueLen(v);
        }
    }
    return rowsize;
}

Example 43 with Page

use of org.h2.store.Page in project h2database by h2database.

the class PageBtreeIndex method getPage.

/**
 * Read the given page.
 *
 * @param id the page id
 * @return the page
 */
PageBtree getPage(int id) {
    Page p = store.getPage(id);
    if (p == null) {
        PageBtreeLeaf empty = PageBtreeLeaf.create(this, id, PageBtree.ROOT);
        // could have been created before, but never committed
        store.logUndo(empty, null);
        store.update(empty);
        return empty;
    } else if (!(p instanceof PageBtree)) {
        throw DbException.get(ErrorCode.FILE_CORRUPTED_1, "" + p);
    }
    return (PageBtree) p;
}

Example 44 with Page

use of org.h2.store.Page in project h2database by h2database.

the class PageBtreeLeaf method remove.

@Override
SearchRow remove(SearchRow row) {
    int at = find(row, false, false, true);
    SearchRow delete = getRow(at);
    if (index.compareRows(row, delete) != 0 || delete.getKey() != row.getKey()) {
        throw DbException.get(ErrorCode.ROW_NOT_FOUND_WHEN_DELETING_1, index.getSQL() + ": " + row);
    }
    index.getPageStore().logUndo(this, data);
    if (entryCount == 1) {
        // the page is now empty
        return row;
    }
    removeRow(at);
    memoryChange();
    index.getPageStore().update(this);
    if (at == entryCount) {
        // the last row changed
        return getRow(at - 1);
    }
    // the last row didn't change
    return null;
}

Example 45 with Page

use of org.h2.store.Page in project h2database by h2database.

the class PageBtreeNode method addRowTry.

@Override
int addRowTry(SearchRow row) {
    while (true) {
        int x = find(row, false, true, true);
        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;
        }
        PageBtree page2 = page.split(splitPoint);
        readAllRows();
        addChild(x, page2.getPos(), pivot);
        index.getPageStore().update(page);
        index.getPageStore().update(page2);
        index.getPageStore().update(this);
    }
    updateRowCount(1);
    written = false;
    changeCount = index.getPageStore().getChangeCount();
    return -1;
}