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os/persistentdata/persistentstorage/dbms/utable/UT_DML.CPP
author sl
Tue, 10 Jun 2014 14:32:02 +0200
changeset 1 260cb5ec6c19
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Update contrib. 
     1 // Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 // SQL DML statements for Table framework

    15 // 

    16 //

    17 

    18 #include "UT_STD.H"

    19 

    20 // Class CSqlValues

    21 

    22 inline CSqlValues::TEntry::TEntry(const RSqlLiteral& aValue)

    23 	:iValue(aValue)

    24 	{}

    25 

    26 CSqlValues::CSqlValues()

    27 	:iValues(EGranularity)

    28 	{}

    29 

    30 CSqlValues::~CSqlValues()

    31 //

    32 // close all the literal objects

    33 //

    34 	{

    35 	for (TInt ii=iValues.Count();--ii>=0;)

    36 		iValues[ii].iValue.Close();

    37 	iValues.Close();

    38 	}

    39 

    40 void CSqlValues::AddL(const RSqlLiteral& aLiteral)

    41 	{

    42 	TEntry e(aLiteral);

    43 	__DEBUG(e.iType=TDbColType(-1);)

    44 	__LEAVE_IF_ERROR(iValues.Append(e));

    45 	}

    46 

    47 void CSqlValues::BindL(const CDbDataSource& aSource)

    48 //

    49 // Bind the values to a column set and optional column name list

    50 //

    51 	{

    52 	iValues.Compress();				// we have finished adding values

    53 	TInt columns=iValues.Count();

    54 	__ASSERT(columns>0);

    55 	if (aSource.ColumnCount()<columns)

    56 		__LEAVE(KErrArgument);		// insert-statement is bad

    57 	for (TInt ii=0;ii<columns;++ii)

    58 		{

    59 		TEntry& e=iValues[ii];

    60 		__ASSERT(e.iType==-1);

    61 		e.iType=aSource.ColumnDef(ii+1).Type();

    62 		if (e.iValue.IsNull())

    63 			continue;

    64 		switch (e.iType)

    65 			{

    66 		default:	// cannot set this kind of column from SQL

    67 			__LEAVE(KErrGeneral);

    68 			break;

    69 		case EDbColBit:

    70 		case EDbColUint8:

    71 		case EDbColUint16:

    72 		case EDbColUint32:

    73 			e.iValue.ToUint32L();

    74 			break;

    75 		case EDbColInt8:

    76 		case EDbColInt16:

    77 		case EDbColInt32:

    78 			e.iValue.ToInt32L();

    79 			break;

    80 		case EDbColInt64:

    81 			e.iValue.ToInt64L();

    82 			break;

    83 		case EDbColReal32:

    84 			e.iValue.ToReal32L();

    85 			break;

    86 		case EDbColReal64:

    87 			e.iValue.ToReal64L();

    88 			break;

    89 		case EDbColDateTime:

    90 			e.iValue.ToTimeL();

    91 			break;

    92 		case EDbColText8:

    93 		case EDbColLongText8:

    94 			e.iValue.ToText8L();

    95 			break;

    96 		case EDbColText16:

    97 		case EDbColLongText16:

    98 			e.iValue.ToText16L();

    99 			break;

   100 			}

   101 		}

   102 	}

   103 

   104 void CSqlValues::WriteL(CDbDataSource& aSource,CDbTable& aTable) const

   105 //

   106 // Set the row buffer with the values

   107 //

   108 	{

   109 	__ASSERT(iValues.Count()>0);

   110 	CDbBlobSpace* blobstore=0;

   111 	TInt columns=iValues.Count();

   112 	for (TInt ii=0;ii<columns;++ii)

   113 		{

   114 		TDbColumn col(aSource.Column(ii+1));

   115 		const TEntry& e=iValues[ii];

   116 		if (TDbCol::IsLong(e.iType))

   117 			{	// check if we need to delete a blob

   118 			if (!blobstore)

   119 				blobstore=aTable.BlobsL();

   120 			__ASSERT(blobstore);

   121 			const TDbBlob& blob=TDbColumnC(col).Blob();

   122 			if (!blob.IsInline())

   123 				blobstore->DeleteL(blob.Id());

   124 			}

   125 		if (e.iValue.IsNull())

   126 			{	// null value

   127 			col.SetNull();

   128 			continue;

   129 			}

   130 		switch (e.iType)

   131 			{

   132 		default:

   133 			__ASSERT(0);

   134 		case EDbColBit:

   135 		case EDbColUint8:

   136 		case EDbColUint16:

   137 		case EDbColUint32:

   138 			col.SetL(e.iValue.Uint32());

   139 			break;

   140 		case EDbColInt8:

   141 		case EDbColInt16:

   142 		case EDbColInt32:

   143 			col.SetL(e.iValue.Int32());

   144 			break;

   145 		case EDbColInt64:

   146 			col.SetL(e.iValue.Int64());

   147 			break;

   148 		case EDbColReal32:

   149 			col.SetL(e.iValue.Real32());

   150 			break;

   151 		case EDbColReal64:

   152 			col.SetL(e.iValue.Real64());

   153 			break;

   154 		case EDbColDateTime:

   155 			col.SetL(e.iValue.Time());

   156 			break;

   157 		case EDbColText8:

   158 			col.SetL(e.iValue.Text8());

   159 			break;

   160 		case EDbColText16:

   161 			col.SetL(e.iValue.Text16());

   162 			break;

   163 		case EDbColLongText8:

   164 			{

   165 			const TDesC8& val=e.iValue.Text8();

   166 			const TUint8* ptr=val.Ptr();

   167 			TInt size=val.Length();

   168 			if (size>blobstore->InlineLimit())

   169 				col.SetBlobL(blobstore->CreateL(EDbColLongText8,ptr,size),size);

   170 			else

   171 				col.SetBlobL(ptr,size);

   172 			}

   173 			break;

   174 		case EDbColLongText16:

   175 			{

   176 			const TDesC16& val=e.iValue.Text16();

   177 			const TUint8* ptr=REINTERPRET_CAST(const TUint8*,val.Ptr());

   178 			TInt size=val.Length()<<1;

   179 			if (size>blobstore->InlineLimit())

   180 				col.SetBlobL(blobstore->CreateL(EDbColLongText16,ptr,size),size);

   181 			else

   182 				col.SetBlobL(ptr,size);

   183 			}

   184 			break;

   185 			}

   186 		}

   187 	}

   188 

   189 // Class CSqlDMLStatement

   190 

   191 CSqlDMLStatement::~CSqlDMLStatement()

   192 	{

   193 	delete iValues;

   194 	}

   195 

   196 CSqlValues& CSqlDMLStatement::ValuesL()

   197 	{

   198 	CSqlValues* v=iValues;

   199 	if (!v)

   200 		iValues=v=new(ELeave) CSqlValues;

   201 	return *v;

   202 	}

   203 

   204 // Class CSqlInsertStatement

   205 

   206 CSqlInsertStatement* CSqlInsertStatement::NewLC()

   207 	{

   208 	CSqlInsertStatement* self=new(ELeave) CSqlInsertStatement;

   209 	CleanupStack::PushL(self);

   210 	return self;

   211 	}

   212 

   213 CDbIncremental* CSqlInsertStatement::ExecuteL(CDbTableDatabase& aDatabase,TDbTextComparison aComparison,TInt& aRows)

   214 //

   215 // Execute an insert-statement. This does not requre incremental work, so return 0

   216 //

   217 	{

   218 	aRows=1;	// 1 row changed after insertion

   219 	CSqlQuery* query=&Query();

   220 	RDbAccessPlan plan(query,aComparison);

   221 	plan.BuildLC(aDatabase,RDbRowSet::EInsertOnly,TDbWindow());

   222 	CDbDataSource& src=plan.Source();

   223 	Values().BindL(src);

   224 	src.NewRowL(KDbNullRecordId);

   225 	RDbTransaction& t=plan.Table().Database().Transaction();

   226 	t.DMLBeginLC();

   227 	Values().WriteL(src,plan.Table());

   228 	src.PrepareToWriteRowL(src.EAppend);

   229 	src.WriteRowL(src.EAppend,src.ENoSynch);

   230 	t.DMLCommitL();

   231 	CleanupStack::Pop();				// transaction complete

   232 	CleanupStack::PopAndDestroy();		// plan

   233 	return 0;	// no incremental work to be done

   234 	}

   235 

   236 // Class CDbIncrementalDML

   237 

   238 CDbIncrementalDML* CDbIncrementalDML::NewL(CSqlModifyStatement& aStatement,CDbTableDatabase& aDatabase,TDbTextComparison aComparison)

   239 	{

   240 	CSqlQuery* query=&aStatement.Query();

   241 	RDbAccessPlan plan(query,aComparison);

   242 	plan.BuildLC(aDatabase,RDbRowSet::EUpdatable,TDbWindow());

   243 	CDbIncrementalDML* self=new(ELeave) CDbIncrementalDML(plan);

   244 	CleanupStack::PopAndDestroy();	// plan

   245 	if (aStatement.IsUpdate())

   246 		{

   247 		CleanupStack::PushL(self);

   248 		self->iValues=aStatement.AdoptValues();

   249 		self->iValues->BindL(*self->iSource);

   250 		CleanupStack::Pop();	// self

   251 		}

   252 	self->iSource->Reset();

   253 	self->Transaction().DMLBegin();

   254 	self->SetState(EEvaluating);

   255 	return self;

   256 	}

   257 

   258 CDbIncrementalDML::~CDbIncrementalDML()

   259 	{

   260 	if (iState!=ECommitted && iState!=EInitialising)

   261 		Transaction().DMLRollback();

   262 	delete iSource;

   263 	delete iValues;

   264 	}

   265 

   266 TBool CDbIncrementalDML::NextL(TInt& aRows)

   267 	{

   268 	__ASSERT(iState!=ECommitted);

   269 	if (iState==EFailed)

   270 		__LEAVE(KErrDied);

   271 	TState s=iState;

   272 	iState=EFailed;

   273 	TInt work=256;

   274 	TDbPosition next=EDbNext;

   275 	if (s==EEvaluating)

   276 		{	// evaluate the data source

   277 		TBool atrow=EFalse;

   278 		if (iSource->EvaluateL(work,iRecord,atrow))

   279 			{

   280 			iState=EEvaluating;

   281 			return ETrue;	// more to do

   282 			}

   283 		iRecord=KDbNullRecordId;

   284 		next=EDbFirst;

   285 		s=EUpdating;

   286 		}

   287 	// iterate across the data source

   288 	for (;;)

   289 		{

   290 		if (s==EDeleting)

   291 			{

   292 			Transaction().DMLBeginLC();

   293 			CDbDataSource::TDelete del=iSource->DeleteRowL(iRecord,CDbDataSource::ESynch);

   294 			Transaction().DMLCommitL();

   295 			CleanupStack::Pop();				// transaction complete

   296 			++aRows;

   297 			work-=4;

   298 			switch (del)

   299 				{

   300 			case CDbDataSource::EDeletedAtEnd:

   301 				Transaction().DMLTouch();

   302 				Transaction().DMLCommitL();

   303 				iState=ECommitted;

   304 				return EFalse;

   305 			case CDbDataSource::EDeletedInLimbo:

   306 				s=EUpdating;

   307 				// coverity[fallthrough]

   308 			case CDbDataSource::EDeletedAtNext:

   309 				if (work<0)

   310 					{	// exhausted

   311 					iState=s;

   312 					return ETrue;

   313 					}

   314 				}

   315 			}

   316 		else

   317 			{

   318 			switch (iSource->GotoL(work,next,iRecord))

   319 				{

   320 			default:

   321 				__ASSERT(0);

   322 			case CDbDataSource::ESuccess:

   323 				next=EDbNext;

   324 				if (!IsUpdate())

   325 					{

   326 					s=EDeleting;

   327 					break;

   328 					}

   329 				iSource->ReadRowL(iRecord);

   330 				iValues->WriteL(*iSource,iTable);

   331 				iSource->PrepareToWriteRowL(CDbDataSource::EReplace);

   332 				Transaction().DMLBeginLC();

   333 				iSource->WriteRowL(CDbDataSource::EReplace,CDbDataSource::ESynch);

   334 				Transaction().DMLCommitL();

   335 				CleanupStack::Pop();				// transaction complete

   336 				++aRows;

   337 				work-=8;

   338 				break;

   339 			case CDbDataSource::ESynchFailure:

   340 				// dead

   341 				__LEAVE(KErrDied);

   342 			case CDbDataSource::EExhausted:

   343 				// more to do

   344 				iState=EUpdating;

   345 				return ETrue;

   346 			case CDbDataSource::ENoRow:

   347 				// completed the operation!

   348 				Transaction().DMLTouch();

   349 				Transaction().DMLCommitL();

   350 				iState=ECommitted;

   351 				return EFalse;

   352 				}

   353 			}

   354 		}

   355 	}

   356 

   357 

   358 // Class CSqlModifyStatement

   359 

   360 CSqlModifyStatement* CSqlModifyStatement::NewLC()

   361 	{

   362 	CSqlModifyStatement* self=new(ELeave) CSqlModifyStatement;

   363 	CleanupStack::PushL(self);

   364 	return self;

   365 	}

   366 

   367 CDbIncremental* CSqlModifyStatement::ExecuteL(CDbTableDatabase& aDatabase,TDbTextComparison aComparison,TInt& aRows)

   368 //

   369 // Execute an update/delete-statement, returning the incremental object that does the work

   370 //

   371 	{

   372 	aRows=0;		// no rows affected initially

   373 	return CDbIncrementalDML::NewL(*this,aDatabase,aComparison);

   374 	}
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