metadataengine/server/inc/mdsindexer.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 18 Jan 2010 20:34:07 +0200
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/*
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* Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies). 
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  A singleton that provides system unique ID's*
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*/
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#ifndef __MDSINDEXER_H__
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#define __MDSINDEXER_H__
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// INCLUDE FILES
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#include <e32base.h>
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#include <e32cmn.h>
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#include "mdccommon.h"
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// FORWARD DECLARATIONS
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class RRowData;
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// CLASS DECLARATION
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/**
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* A static class that is used to provide system unique
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* ID's for database storage purposes. 
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*/
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class MMdSIndexer
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    {
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    public: // Public functions
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    	/**
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    	 * Gets last object id from DB
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    	 * MUST be called once, when connection to DB is established
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    	 */
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    	static TItemId StartIndexL();
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    	/**
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	     * Provides a new system unique ID
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	     * @return a new system-wide unique ID
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	     */
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	    static TItemId GetIndex( );
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	    /**
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	     * Reverts system ID to previous state
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	     * used when add item failed
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	     */
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	    static void RevertIndex( );
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	    /**
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	     * Executes a SQL clause and returns the ID of the last object in DB.
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	     * @param aSqlClause SQL clause to execute
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	     * @param aRowData query parameters
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	     * @return result of last_insert_rowid()
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	     */
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	    static TItemId ExecuteAndGetIndexL(const TDesC &aSqlClause, const RRowData &aRowData );	    	
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	private:
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		static TItemId GetIndexL();
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		static void GetLastItemIdL();
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		static TItemId iId;
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	};
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class RSQLIndex
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	{
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	public:
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		RSQLIndex();
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		const TItemId& GetId() const;
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		void Commit();
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		void Close();
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	private:
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		const TItemId iId;
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		TBool iCommit;
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	};
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#endif // __MDSINDEXER_H__