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DataNucleus supports persistence to heterogeneous datastores and this plugin provides persistence to Excel.
There is a newer version: 5.0.0-m5
/**********************************************************************
Copyright (c) 2010 Guido Anzuoni and others. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

Contributors :
2011 Andy Jefferson - remove lots of duplication from FetchFieldManager
 ...
***********************************************************************/
package org.datanucleus.store.excel.fieldmanager;

import java.util.ArrayList;
import java.util.List;

import org.apache.poi.ss.usermodel.Sheet;
import org.datanucleus.ClassLoaderResolver;
import org.datanucleus.ExecutionContext;
import org.datanucleus.metadata.AbstractClassMetaData;
import org.datanucleus.metadata.AbstractMemberMetaData;
import org.datanucleus.metadata.EmbeddedMetaData;
import org.datanucleus.metadata.MetaDataUtils;
import org.datanucleus.metadata.RelationType;
import org.datanucleus.state.ObjectProvider;
import org.datanucleus.store.fieldmanager.FieldManager;
import org.datanucleus.store.schema.table.MemberColumnMapping;
import org.datanucleus.store.schema.table.Table;
import org.datanucleus.util.NucleusLogger;

/**
 * FieldManager to handle the retrieval of information for an embedded persistable object from a row of Excel.
 */
public class FetchEmbeddedFieldManager extends FetchFieldManager
{
    /** Metadata for the embedded member (maybe nested) that this FieldManager represents). */
    protected List mmds;

    public FetchEmbeddedFieldManager(ExecutionContext ec, Sheet sheet, int row, AbstractClassMetaData cmd, List mmds, Table table)
    {
        super(ec, cmd, sheet, row, table);
        this.mmds = mmds;
    }

    public FetchEmbeddedFieldManager(ObjectProvider op, Sheet sheet, int row, List mmds, Table table)
    {
        super(op, sheet, row, table);
        this.mmds = mmds;
    }

    protected MemberColumnMapping getColumnMapping(int fieldNumber)
    {
        List embMmds = new ArrayList(mmds);
        embMmds.add(cmd.getMetaDataForManagedMemberAtAbsolutePosition(fieldNumber));
        return table.getMemberColumnMappingForEmbeddedMember(embMmds);
    }

    public Object fetchObjectField(int fieldNumber)
    {
        AbstractMemberMetaData mmd = cmd.getMetaDataForManagedMemberAtAbsolutePosition(fieldNumber);
        ClassLoaderResolver clr = ec.getClassLoaderResolver();
        RelationType relationType = mmd.getRelationType(clr);
        EmbeddedMetaData embmd = mmds.get(0).getEmbeddedMetaData();
        if (mmds.size() == 1 && embmd != null && embmd.getOwnerMember() != null && embmd.getOwnerMember().equals(mmd.getName()))
        {
            // Special case of this being a link back to the owner. TODO Repeat this for nested and their owners
            ObjectProvider[] ownerOps = ec.getOwnersForEmbeddedObjectProvider(op);
            return (ownerOps != null && ownerOps.length > 0 ? ownerOps[0].getObject() : null);
        }

        if (relationType != RelationType.NONE && MetaDataUtils.getInstance().isMemberEmbedded(ec.getMetaDataManager(), clr, mmd, relationType, null))
        {
            // Embedded field
            if (RelationType.isRelationSingleValued(relationType))
            {
                // Persistable object embedded into this table
                List embMmds = new ArrayList(mmds);
                embMmds.add(mmd);
                AbstractClassMetaData embCmd = ec.getMetaDataManager().getMetaDataForClass(mmd.getType(), clr);
                ObjectProvider embOP = ec.getNucleusContext().getObjectProviderFactory().newForEmbedded(ec, embCmd, op, fieldNumber);
                FieldManager fetchEmbFM = new FetchEmbeddedFieldManager(embOP, sheet, rowNumber, embMmds, table);
                embOP.replaceFields(embCmd.getAllMemberPositions(), fetchEmbFM);
                return embOP.getObject();
            }
            else if (RelationType.isRelationMultiValued(relationType))
            {
                // TODO Embedded Collection
                NucleusLogger.PERSISTENCE.debug("Field=" + mmd.getFullFieldName() + " not currently supported (embedded)");
            }
            return null; // Remove this when we support embedded
        }

        return fetchObjectFieldInternal(fieldNumber, mmd, clr, relationType);
    }
}