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diff --git a/sc/source/core/inc/doubleref.hxx b/sc/source/core/inc/doubleref.hxx
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+++ b/sc/source/core/inc/doubleref.hxx
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+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2008 by Sun Microsystems, Inc.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * $RCSfile: interpre.hxx,v $
+ * $Revision: 1.35.44.2 $
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+#ifndef SC_DOUBLEREF_HXX
+#define SC_DOUBLEREF_HXX
+
+#include "address.hxx"
+#include "scmatrix.hxx"
+
+class ScDocument;
+class ScBaseCell;
+struct ScDBQueryParamBase;
+struct ScQueryParamBase;
+
+// ============================================================================
+
+/**
+ * Base class for abstracting range data backends for database functions.
+ */
+class ScDBRangeBase
+{
+public:
+    enum RefType { INTERNAL, EXTERNAL }; // TODO: We may not need this after all... (kohei)
+
+    virtual ~ScDBRangeBase() = 0;
+
+    bool fillQueryEntries(ScQueryParamBase* pParam, const ScDBRangeBase* pDBRef) const;
+
+    virtual SCCOL getColSize() const = 0;
+    virtual SCROW getRowSize() const = 0;
+    virtual SCSIZE getVisibleDataCellCount() const = 0;
+
+    /**
+     * Get a string value of a specified cell position.  Note that the
+     * position of the upper left cell of the range is always (0, 0) even if
+     * the reference type is of internal range.
+     *
+     * @param nCol column position (0 to column size-1)
+     * @param nRow row position (0 to row size-1)
+     */
+    virtual ::rtl::OUString getString(SCCOL nCol, SCROW nRow) const = 0;
+
+    virtual SCCOL getFirstFieldColumn() const = 0;
+
+    /**
+     * Get a <i>0-based</i> column index that corresponds with the passed field
+     * index.  Note that the field index passed as the 1st parameter is
+     * <i>1-based.</i>
+     *
+     * @param nIndex 1-based field index.
+     *
+     * @return 0-based column index
+     */
+    virtual SCCOL findFieldColumn(SCCOL nIndex) const = 0;
+    virtual SCCOL findFieldColumn(const ::rtl::OUString& rStr, sal_uInt16* pErr = NULL) const = 0;
+    virtual ScDBQueryParamBase* createQueryParam(const ScDBRangeBase* pQueryRef) const = 0;
+    virtual bool isRangeEqual(const ScRange& rRange) const = 0;
+
+protected:
+    ScDBRangeBase(ScDocument* pDoc, RefType eType);
+    ScDocument* getDoc() const;
+
+    /**
+     * Populate query options that are always the same for all database
+     * queries.
+     */
+    static void fillQueryOptions(ScQueryParamBase* pParam);
+
+private:
+    ScDBRangeBase(); // disabled
+
+    ScDocument* mpDoc;
+    RefType meType;
+};
+
+// ============================================================================
+
+class ScDBInternalRange : public ScDBRangeBase
+{
+public:
+    explicit ScDBInternalRange(ScDocument* pDoc, const ScRange& rRange);
+    virtual ~ScDBInternalRange();
+
+    const ScRange& getRange() const;
+
+    virtual SCCOL getColSize() const;
+    virtual SCROW getRowSize() const;
+    virtual SCSIZE getVisibleDataCellCount() const;
+
+    /**
+     * Get a string value of a specified cell position.  Note that the
+     * position of the upper left cell of the range is always (0, 0) even if
+     * the reference type is of internal range.
+     *
+     * @param nCol column position (0 to column size-1)
+     * @param nRow row position (0 to row size-1)
+     */
+    virtual ::rtl::OUString getString(SCCOL nCol, SCROW nRow) const;
+
+    virtual SCCOL getFirstFieldColumn() const;
+    /**
+     * Get a <i>0-based</i> column index that corresponds with the passed field
+     * index.  Note that the field index passed as the 1st parameter is
+     * <i>1-based.</i>
+     *
+     * @param nIndex 1-based field index.
+     *
+     * @return 0-based column index
+     */
+    virtual SCCOL findFieldColumn(SCCOL nIndex) const;
+    virtual SCCOL findFieldColumn(const ::rtl::OUString& rStr, sal_uInt16* pErr = NULL) const;
+    virtual ScDBQueryParamBase* createQueryParam(const ScDBRangeBase* pQueryRef) const;
+    virtual bool isRangeEqual(const ScRange& rRange) const;
+
+private:
+    sal_uInt16 getCellString(::rtl::OUString& rStr, ScBaseCell* pCell) const;
+
+private:
+    ScRange maRange;
+};
+
+// ============================================================================
+
+class ScDBExternalRange : public ScDBRangeBase
+{
+public:
+    explicit ScDBExternalRange(ScDocument* pDoc, const ScMatrixRef& pMat);
+    virtual ~ScDBExternalRange();
+
+    virtual SCCOL getColSize() const;
+    virtual SCROW getRowSize() const;
+    virtual SCSIZE getVisibleDataCellCount() const;
+
+    /**
+     * Get a string value of a specified cell position.  Note that the
+     * position of the upper left cell of the range is always (0, 0) even if
+     * the reference type is of internal range.
+     *
+     * @param nCol column position (0 to column size-1)
+     * @param nRow row position (0 to row size-1)
+     */
+    virtual ::rtl::OUString getString(SCCOL nCol, SCROW nRow) const;
+
+    virtual SCCOL getFirstFieldColumn() const;
+
+    /**
+     * Get a <i>0-based</i> column index that corresponds with the passed field
+     * index.  Note that the field index passed as the 1st parameter is
+     * <i>1-based.</i>
+     *
+     * @param nIndex 1-based field index.
+     *
+     * @return 0-based column index
+     */
+    virtual SCCOL findFieldColumn(SCCOL nIndex) const;
+    virtual SCCOL findFieldColumn(const ::rtl::OUString& rStr, sal_uInt16* pErr = NULL) const;
+    virtual ScDBQueryParamBase* createQueryParam(const ScDBRangeBase* pQueryRef) const;
+    virtual bool isRangeEqual(const ScRange& rRange) const;
+
+private:
+    const ScMatrixRef mpMatrix;
+    SCCOL mnCols;
+    SCROW mnRows;
+};
+
+#endif