inc/mdssqlrow.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 19 Aug 2010 10:20:41 +0300
branchRCL_3
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Revision: 201031 Kit: 201033
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/*
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* Copyright (c) 2002-2009 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:  Abstract SQL connection class*
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*/
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#ifndef __MDSSQLCONNECTION_H__
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#define __MDSSQLCONNECTION_H__
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#include <e32base.h>
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#include "mdccommon.pan"
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#include "mdscommoninternal.h"
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// types of columns
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enum TColumnDataType
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    {
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    EColumnNotUsed,
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    EColumnBool,
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    EColumnInt32,
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    EColumnUint32,
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    EColumnInt64,
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    EColumnReal32,
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    EColumnReal64,
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    EColumnTime,
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    EColumnDes8,
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    EColumnDes16,  // could be used as Unknown, because it checks the
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                   // actual type from sqlite
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    EColumnHBuf8,  // local pointer responsibility
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    EColumnHBuf16, // local pointer responsibility
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    EColumnNullDes8,
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    EColumnNullDes16, // used when db column is null 
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    //EColumnUnknown
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    EColumnTItemId = EColumnUint32, // should be changed according to TItemId definition
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    EColumnTDefId = EColumnUint32, // should be changed according to TDefId definition
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    };
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/**
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* A class representing a database column.
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* The column contains a type and an untyped pointer, which can
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* be cast to represent various types.
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*/
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NONSHARABLE_CLASS(TColumn)
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    {
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    public:
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        /** Returns column type. */
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        inline TColumnDataType Type() const;
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        /** Constructs a column with data type only. Use for queries. */
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        inline TColumn( TColumnDataType aType = EColumnNotUsed );
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        /** frees allocated memory in this column */
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        inline void Free();
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        // constructors
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        TColumn( TInt32 aVal ) { Set( aVal ); }
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        TColumn( TUint32 aVal ) { Set( aVal ); }
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        TColumn( TBool aVal ) { Set( aVal ); }
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        TColumn( TInt64 aVal ) { Set( aVal ); }
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        TColumn( TReal32 aVal ) { Set( aVal ); }
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        TColumn( TReal64 aVal ) { Set( aVal ); }
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        TColumn( TTime aVal ) { Set( aVal ); }
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        TColumn( const TDesC8& aVal ) { Set( aVal ); }
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        TColumn( const TDesC16& aVal ) { Set( aVal ); }
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        TColumn( const HBufC8* aVal ) { Set( aVal ); }
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        TColumn( const HBufC16* aVal ) { Set( aVal ); }
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        // data setters & getters
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        inline void Set( TInt32 aVal );
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        inline void Set( TUint32 aVal );
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        inline void Set( TBool aVal );
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        inline void Set( TInt64 aVal );
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        inline void Set( TReal32 aVal );
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        inline void Set( TReal64 aVal );
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        inline void Set( TTime aVal );
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        inline void Set( const TDesC8& aVal );
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        inline void Set( const TDesC16& aVal );
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        inline void Set( const HBufC8* aVal );
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        inline void Set( const HBufC16* aVal );
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        inline void NotUsed();
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        // data getters
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        inline void Get( TInt32& aValue ) const;
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        inline void Get( TUint32& aValue ) const;
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        inline void Get( TBool& aValue ) const;
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        inline void Get( TInt64& aValue ) const;
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        inline void Get( TReal32& aValue ) const;
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        inline void Get( TReal64& aValue ) const;
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        inline void Get( TTime& aValue ) const;
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        inline void Get( TPtrC8& aValue ) const;
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        inline void Get( TPtrC16& aValue ) const;
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        inline TBool IsNull();
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        /**
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        * type of data in this column
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        */
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        TColumnDataType iType;
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        /**
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        * a structure to store multi-typed data
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        */
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        union TMultiTypeData
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            {
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            /*struct
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                {
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                TUint32 iLow;
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                TUint32 iHigh;
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                } iInt64;*/
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            TInt64 iInt64;
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            TReal32 iReal32;
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            TReal64 iReal64;
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            TInt32 iInt32;
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            TUint32 iUint32;
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            struct
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                {
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                TAny* iPtr;
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                TInt iLen;
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                } iText;
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            };
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        /**
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        * multi-use data in this column
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        */
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        TMultiTypeData iData;
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    };
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/**
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* A class representing a database row.
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* The class describes each column type and the data in the column.
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* where column data is located. The class is provided during
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* query and is used when each row is read. Note that the
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* buffer class MAY be modified by the user during the query.
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* The same class is also used when replacing wildcards with
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* variable data.
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*/
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class RRowData
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    {
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    public:
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        /**
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        * constructor
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        */
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        inline RRowData();
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        /** Closes all the resources used by this object */
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        inline void Close();
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        /** frees allocated memory in this row */
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        inline void Free();
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        /** number of columns or variables */
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        inline TInt Size() const;
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        /** returns column by index */
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        inline TColumn& Column( TInt aIndex );
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        /** returns column by index */
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        inline const TColumn& Column( TInt aIndex ) const;
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        /** Appends a new column in row */
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        inline TColumn& AppendL( const TColumn& aColumn );
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        /** Resets the row */
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        inline void Reset();
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		/** Copy all columns */
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		void AppendColumnTypesL( RRowData& aColumnTypeRow );
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		/** Receive space to row */
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		void ReserveL( TInt aColumnCount );
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    protected:
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        /** The array of columns */
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        RArray<TColumn> iColumns;
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    };
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#include "mdssqlrow.inl" // inline methods
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#endif	// __MDSSQLCONNECTION_H__
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// End of File