persistentstorage/sql/SRC/Server/Compact/SqlCompactConn.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 01 Apr 2010 00:19:42 +0300
branchRCL_3
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permissions -rw-r--r--
Revision: 201013 Kit: 201013
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// Copyright (c) 2008-2010 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:
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//
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#include <f32file.h>
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#include <sqldb.h>
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#include "SqlPanic.h"
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#include "sqlite3.h"
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#include "SqliteSymbian.h"		//TSqlFreePageCallback
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#include "SqlSrvUtil.h"
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#include "SqlSrvStatementUtil.h"
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#include "SqlCompactConn.h"
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/**
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Creates a new CSqlCompactConn instance.
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@param aFullName The full database name, including the path.
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@param aFreePageCallback A reference to an object containing the free pages threshold and the callback
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					     that needs to be called when the free page count reaches or is above the threshold.
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						 aFreePageCallback.iThreshold must be set to be in Kb. 	
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						 If the function call completes successfully and the free pages space is above the threshold,
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						 the aFreePageCallback.iThreshold will be set to contain the free pages count.
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						 Otherwise aFreePageCallback.iThreshold will be initialized with zero.
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@return A pointer to the created CSqlCompactConn instance
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@leave KErrNoMemory, an out of memory condition has occurred,
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	   KErrArgument, invalid data in the aFreePageCallback object;
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                     Note that the function may also leave with some other database specific 
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                     errors categorised as ESqlDbError, and other system-wide error codes.
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@panic SqlDb 4 In _DEBUG mode. Too short or too long database name (aFullName parameter)
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@panic SqlDb 4 In _DEBUG mode. Invalid aFreePageCallback content.
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*/
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CSqlCompactConn* CSqlCompactConn::NewL(const TDesC& aFullName, TSqlFreePageCallback& aFreePageCallback)
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	{
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	__SQLASSERT(aFullName.Length() > 0 && aFullName.Length() <= KMaxFileName, ESqlPanicBadArgument);
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	__SQLASSERT(aFreePageCallback.IsValid(), ESqlPanicBadArgument);
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	CSqlCompactConn* self = new (ELeave) CSqlCompactConn;
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	CleanupStack::PushL(self);
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	self->ConstructL(aFullName, aFreePageCallback);
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	CleanupStack::Pop(self);
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	return self;
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	}
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/**
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Destroys the CSqlCompactConn instance.
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*/
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CSqlCompactConn::~CSqlCompactConn()
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	{
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	::CloseDbHandle(iHandle);
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 	}
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/**
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Implements MSqlCompactConn::Release().
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Destroys the CSqlCompactConn instance.
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*/
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void CSqlCompactConn::Release()
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	{
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	SQLCOMPACTCONN_INVARIANT();
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	delete this;	
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	}
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/**
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Implements MSqlCompactConn::Compact().
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Compacts the database making an attempt to remove the specified amount of free pages.
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@param aPageCount 			The amount of free pages to be removed.
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@param aProcessedPageCount	Output parameter. The actual count of the removed free pages will be stored there.
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@param aLength 				Desired length of the compaction in milliseconds.
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@return KErrNoMemory, an out of memory condition has occurred;
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                      Note that the function may also return some other database specific 
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                      errors categorised as ESqlDbError, and other system-wide error codes.
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@panic SqlDb 4 In _DEBUG mode. Negative aPageCount value.
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@panic SqlDb 4 In _DEBUG mode. Negative aLength value.
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*/
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TInt CSqlCompactConn::Compact(TInt aPageCount, TInt& aProcessedPageCount, TInt aLength)
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	{
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	__SQLASSERT(aPageCount >= 0, ESqlPanicBadArgument);
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	__SQLASSERT(aLength >= 0, ESqlPanicBadArgument);
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	SQLCOMPACTCONN_INVARIANT();
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	TInt err = ::DbCompact(iHandle, KNullDesC, aPageCount, aProcessedPageCount, aLength);
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	SQLCOMPACTCONN_INVARIANT();
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	return err;
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	}
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/**
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Initializes the CSqlCompactConn instance establishing a connection with the database to be compacted.
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Registers the passed "free page" callback.
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Note: The free page threshold data member of the callback is in Kb. 
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	  The function implementation will convert that threshold to pages and pass it to the OS porting layer.
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@param aFullName The full database name, including the path.
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@param aFreePageCallback Input/Output parameter. A reference to an object containing the free pages threshold and 
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						 the callback that needs to be called when the free page count reaches or is above the threshold.
0
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						 aFreePageCallback.iThreshold must be set to be in Kb. 	
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						 If the function call completes successfully and the free pages space is above the threshold,
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						 the aFreePageCallback.iThreshold will be set to contain the free pages count.
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						 Otherwise aFreePageCallback.iThreshold will be initialized with zero.
0
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@leave KErrNoMemory, an out of memory condition has occurred,
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	   KErrArgument, invalid data in the aFreePageCallback object;
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                     Note that the function may also leave with some other database specific 
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                     errors categorised as ESqlDbError, and other system-wide error codes.
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@panic SqlDb 4 In _DEBUG mode. Too short or too long database name (aFullName parameter)
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@panic SqlDb 4 In _DEBUG mode. Invalid aFreePageCallback content.
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@panic SqlDb 7 In _DEBUG mode. The database connection has been already established (not null db handle).
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*/
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void CSqlCompactConn::ConstructL(const TDesC& aFullName, TSqlFreePageCallback& aFreePageCallback)
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	{
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	__SQLASSERT(aFullName.Length() > 0 && aFullName.Length() <= KMaxFileName, ESqlPanicBadArgument);
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	__SQLASSERT(aFreePageCallback.IsValid(), ESqlPanicBadArgument);
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	__SQLASSERT(!iHandle, ESqlPanicInternalError);
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	TBuf8<KMaxFileName + 1> fname;
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	(void)::UTF16ToUTF8Z(aFullName, fname);//The file is first open by the main connection. 
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										   //The conversion here should always succeed.
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										   //Even in a case of a conversion failure, the next line will report a failure.
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	__SQLLEAVE_IF_ERROR(::CreateDbHandle8(fname, iHandle));
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	TInt pageSize = PageSizeL();
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	TInt64 freePageThresholdKb = aFreePageCallback.iThreshold;//"TInt64" because the calculation of the pages may cause an overflow on the next line
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	aFreePageCallback.iThreshold = (freePageThresholdKb * 1024) / pageSize;//the threshold can be 0
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	TBuf8<sizeof(KMainDb8) + 1> dbName;
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	dbName.Copy(KMainDb8);
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	TInt err = sqlite3_file_control(iHandle, (const char *)dbName.PtrZ(), KSqlFcntlRegisterFreePageCallback, &aFreePageCallback);
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	__SQLLEAVE_IF_ERROR(::Sql2OsErrCode(err, sqlite3SymbianLastOsError()));
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	TInt64 freePageCount = FreePageCountL();//"TInt64" because the calculation of the free space may cause an overflow on the next line
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	TInt freePageSpaceKb = (freePageCount * pageSize) / 1024;
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	//Set iThreshold with the free pages count, if right now the database has free space above the threshold.
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	aFreePageCallback.iThreshold = freePageSpaceKb >= freePageThresholdKb ? freePageCount : 0;
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	}
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/**
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Retrieves the database free pages count.
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@leave KErrNoMemory, an out of memory condition has occurred;
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                      Note that the function may also return some other database specific 
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                      errors categorised as ESqlDbError, and other system-wide error codes.
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@return Free pages count
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*/
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TInt CSqlCompactConn::FreePageCountL()
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	{
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	SQLCOMPACTCONN_INVARIANT();
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	TInt freePageCount = 0;
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	__SQLLEAVE_IF_ERROR(::DbFreePageCount(iHandle, KNullDesC, freePageCount));
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	SQLCOMPACTCONN_INVARIANT();
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	return freePageCount;
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	}
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/**
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Retrieves the database page size in bytes.
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@leave KErrNoMemory, an out of memory condition has occurred;
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                      Note that the function may also return some other database specific 
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                      errors categorised as ESqlDbError, and other system-wide error codes.
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@return Page size
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*/
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TInt CSqlCompactConn::PageSizeL()
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	{
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	SQLCOMPACTCONN_INVARIANT();
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	TInt pageSize = 0;
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	__SQLLEAVE_IF_ERROR(::DbPageSize(iHandle, KNullDesC, pageSize));
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	SQLCOMPACTCONN_INVARIANT();
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	return pageSize;
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	}
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#ifdef _DEBUG
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/**
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CSqlCompactConn invariant.
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*/
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void CSqlCompactConn::Invariant() const
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	{
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	__SQLASSERT_ALWAYS(iHandle != NULL, ESqlPanicInternalError);
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	}
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#endif//_DEBUG
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/**
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A factory function for CSqlCompactConn.
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@param aFullName The full name of the database to be compacted (including the path).
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@param aFreePageCallback A reference to an object containing the free pages threshold and the callback
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					     that needs to be called when the free page count reaches or is above the threshold.
0
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						 aFreePageCallback.iThreshold must be set to be in Kb. 	
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						 If the function call completes successfully and the free pages space is above the threshold,
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						 the aFreePageCallback.iThreshold will be set to contain the free pages count.
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						 Otherwise aFreePageCallback.iThreshold will be initialized with zero.
0
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@return A pointer to the created MSqlCompactConn interface.
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@leave KErrNoMemory, an out of memory condition has occurred,
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	   KErrArgument, invalid data in the aFreePageCallback object;
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                     Note that the function may also leave with some other database specific 
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                     errors categorised as ESqlDbError, and other system-wide error codes.
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@see MSqlCompactConn
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@see CSqlCompactConn
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@internalComponent
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@panic SqlDb 4 In _DEBUG mode. Too short or too long database name (aFullName parameter)
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@panic SqlDb 4 In _DEBUG mode. Invalid aFreePageCallback content.
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*/
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MSqlCompactConn* SqlCreateCompactConnL(const TDesC& aFullName, TSqlFreePageCallback& aFreePageCallback)
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	{
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	__SQLASSERT(aFullName.Length() > 0 && aFullName.Length() <= KMaxFileName, ESqlPanicBadArgument);
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	__SQLASSERT(aFreePageCallback.IsValid(), ESqlPanicBadArgument);
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	return CSqlCompactConn::NewL(aFullName, aFreePageCallback);
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	}