persistentstorage/sql/SRC/Server/SqlSrvDatabase.inl
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 22 Jan 2010 11:06:30 +0200
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// Copyright (c) 2006-2009 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:
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//
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/**
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 Retrieves a reference to the textual description of the error returned by the
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 most recent call to any of the functions:
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 - CSqlSrvDatabase::ExecL();
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 - CSqlSrvStatement::NewLC();
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 - CSqlSrvStatement::Next();
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 - CSqlSrvStatement::Reset();
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 - CSqlSrvStatement::Exec();
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 Note that the function can only return a reference to text for
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 database-specific type errors, i.e. those errors that are categorised as of
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 type ESqlDbError.
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 @return A non-modifiable pointer descriptor representing the most recent error
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 message. Note that message may be NULL, i.e. the descriptor may have
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 zero length.
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 @see CSqlSrvDatabase::ExecL()
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 @see CSqlSrvStatement::NewLC()
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 @see CSqlSrvStatement::Next()
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 @see CSqlSrvStatement::Reset()
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 @see CSqlSrvStatement::Exec()
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*/
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inline TPtrC CSqlSrvDatabase::LastErrorMessage() const
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	{
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	const void* errMsg = sqlite3_errmsg16(iDbHandle);//"errMsg" - zero terminated string
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	TPtrC msg(reinterpret_cast <const TUint16*> (errMsg));//terminating zero removed
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	return msg;
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	}
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/**
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Executes one or more 16-bit SQL statements.
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SQL statements of any kind can be executed, but note the following points:
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- the function does not return any records if the SQL statement type is "SELECT".
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- if an SQL statement contains one or more parameters, then the function will execute it,
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giving the parameters default NULL values.
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If the call to this function fails because of a database-specific type error 
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(i.e. the error is categorised as of type ESqlDbError), then a textual description of
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the error can be obtained calling CSqlSrvDatabase::LastErrorMessage().
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@param aSqlStmt A zero-terminated string descriptor of 16-bit wide characters containing one or more 
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                SQL statements. Each statement is separated by a ';' character.
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                Note that the ExecL() call can modify the content of aSqlStmt parameter.
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@leave  KErrNoMemory, an out of memory condition has occured;
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        KSqlErrGeneral, a syntax error has occurred - text describing the problem
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                        can be obtained by calling 	CSqlSrvDatabase::LastErrorMessage();
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        KErrPermissionDenied, the caller does not satisfy the relevant database security policies.
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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 CSqlSrvDatabase::LastErrorMessage()
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*/
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inline void CSqlSrvDatabase::ExecL(TDes16& aSqlStmt)
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	{
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	__SQLLEAVE_IF_ERROR(::DbExecStmt16(iDbHandle, aSqlStmt));
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	}
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/**
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Executes one or more 8-bit SQL statements.
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SQL statements of any kind can be executed, but note the following points:
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- the function does not return any records if the SQL statement type is "SELECT".
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- if an SQL statement contains one or more parameters, then the function will execute it,
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giving the parameters default NULL values.
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If the call to this function fails because of a database-specific type error 
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(i.e. the error is categorised as of type ESqlDbError), then a textual description of
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the error can be obtained calling CSqlSrvDatabase::LastErrorMessage().
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@param aSqlStmt A zero-terminated string descriptor of 8-bit wide characters containing one or more 
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                SQL statements. Each statement is separated by a ';' character.
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@leave  KErrNoMemory, an out of memory condition has occured;
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        KSqlErrGeneral, a syntax error has occurred - text describing the problem
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                        can be obtained by calling 	CSqlSrvDatabase::LastErrorMessage();
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        KErrPermissionDenied, the caller does not satisfy the relevant database security policies.
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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 CSqlSrvDatabase::LastErrorMessage()
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*/
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inline void CSqlSrvDatabase::ExecL(const TDesC8& aSqlStmt)
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	{
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	__SQLLEAVE_IF_ERROR(::DbExecStmt8(iDbHandle, aSqlStmt));
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	}
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/**
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Sets the transaction isolation level for the database.
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A transaction isolation level defines the way in which a transaction
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interacts with other transactions that may be in progress concurrently.
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Transaction isolation levels are defined by the values of the
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RSqlDatabase::TIsolationLevel enum.
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The default isolation level is RSqlDatabase::ESerializable
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Note that the isolation level is not a persistent property of the database.
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It is set to the default value, i.e. RSqlDatabase::ESerializable,
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whenever the database is created or opened.
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@param aLevel The isolation level to be set.
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@leave KErrNotSupported, invalid (not supported) transaction isolation level.
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						 Current implementation of CSqlSrvDatabase::SetIsolationLevelL()
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						 does not support RSqlDatabase::EReadCommitted and RSqlDatabase::ERepeatableRead
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						 transaction isolation levels.
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*/
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inline void CSqlSrvDatabase::SetIsolationLevelL(RSqlDatabase::TIsolationLevel aLevel)
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	{
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	if(aLevel != RSqlDatabase::EReadUncommitted && aLevel != RSqlDatabase::ESerializable)
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		{
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		__SQLLEAVE(KErrNotSupported);
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		}
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	iAuthorizerDisabled = ETrue;
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	TInt err = ::DbExecStmt8(iDbHandle, aLevel == RSqlDatabase::EReadUncommitted ? KReadUncommittedPragma() : KSerializablePragma());
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	iAuthorizerDisabled = EFalse;
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	__SQLLEAVE_IF_ERROR(err);
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	}
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/**
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@return sqlite3 handle
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@panic SqlDb 7 In _DEBUG mode. iDbHandle is NULL.
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*/
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inline sqlite3* CSqlSrvDatabase::RawDbHandle() const
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	{
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	__SQLASSERT(iDbHandle != NULL, ESqlPanicInternalError);
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	return iDbHandle;	
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	}
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/**
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@return A pointer to the database security policies object.
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Note that there may be no security policies in force for this database (if it is not a secure database).
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@see CSqlSecurityPolicy
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*/	
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inline const CSqlSecurityPolicy* CSqlSrvDatabase::SecurityPolicy() const
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	{
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	return iSecurityPolicy;	
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	}
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/**
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Installs user defined collations.
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At the moment 5 user defined collations with the following names are installed:
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- CompareC0 - 16-bit strings collated comaprison at level 0;
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- CompareC1 - 16-bit strings collated comaprison at level 1;
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- CompareC2 - 16-bit strings collated comaprison at level 2;
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- CompareC3 - 16-bit strings collated comaprison at level 3;
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- CompareF  - 16-bit strings folded comaprison;
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These user defined collations can be used in the following cases:
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- as column constraint in "CREATE TABLE" SQL statements. For example:
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@code
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  CREATE TABLE A(Col1 TEXT COLLATE CompareC1)
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@endcode
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In this case every time when Col1 values have to be compared, the SQL server will use CompareC1 collation.
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- as column constraint in "CREATE INDEX" SQL statements. For example:
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@code
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  CREATE INDEX I ON A(Col1 COLLATE CompareC2)
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@endcode
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In this case SQL server will use CompareC2 collation to compare Col1 values when using the index.
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- In "ORDER BY" clause of "SELECT" SQL statements. For example:
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@code
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  SELECT * FROM A ORDER BY Col1 COLLATE CompareC3
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@endcode
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In this case SQL server will use CompareC3 collation to compare Col1 values when building the result set.
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This function is part of CSqlSrvDatabase instance initialization.
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@leave The function may leave with some database specific errors categorised as ESqlDbError.
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@see TSqlCollate
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@see TSqlCollate::InstallCollationsL()
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*/
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inline void CSqlSrvDatabase::InstallCollationsL()
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	{
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	TSqlCollationUtil collationUtil(iDbHandle);
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	collationUtil.InstallCollationsL();
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	}
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/**
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Stores the initial settings in the system settings table of a database. 
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The initial settings are the specified collation dll name and version 0
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of the database configuration file.
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The collation dll name is used to uniquely identify the collation 
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method which is used by the collation comparison methods: 
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TDesC16::CompareC(), TDesC16::MatchC(), TDesC16::FindC().
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This function is used when a new database is created.
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@param aCollationDllName Collation dll name. It uniquely identifies the current collation method in use.
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                         If the default collation method changes later then the database will be reindexed 
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                         and the new collation dll name will replace the existing one in the settings table.
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@param aDbConfigFileVersion Current config file version or KSqlNullDbConfigFileVersion
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@param aCompactionMode Database compaction mode, one of TSqlCompactionMode enum item values (except ESqlCompactionNotSet)
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@see TSqlCompactionMode
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@panic SqlDb 4 In _DEBUG mode if aCompactionMode parameter value is invalid.
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*/
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inline void CSqlSrvDatabase::StoreSettingsL(const TDesC& aCollationDllName, TInt aDbConfigFileVersion, TSqlCompactionMode aCompactionMode)
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	{
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	__SQLASSERT(aCompactionMode == ESqlCompactionManual || aCompactionMode == ESqlCompactionBackground || aCompactionMode == ESqlCompactionAuto, ESqlPanicBadArgument);
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#if !defined(__SQL_DISABLE_SYMBIAN_SETTINGS_TABLE__)		
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	TSqlDbSysSettings dbSettings(iDbHandle);
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	dbSettings.StoreSettingsL(KMainDb16, aCollationDllName, aDbConfigFileVersion, aCompactionMode);
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#else
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	aCollationDllName.Ptr(); // to avoid compile-time warning
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#endif // !(__SQL_DISABLE_SYMBIAN_SETTINGS_TABLE__)		
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	}
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/**
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This function returns the number of database rows that were updated/inserted/deleted
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by the most recently completed INSERT, UPDATE, or DELETE statement.
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*/
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inline TInt CSqlSrvDatabase::LastChangesCount()
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	{
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	return sqlite3_changes(iDbHandle);
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	}
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/**
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@return Returns the ROWID of the most recent successful INSERT into the database from this database connection.
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        If no successful inserts have ever occurred on this database connection, zero is returned.
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*/
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inline TInt64 CSqlSrvDatabase::LastInsertedRowId()
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	{
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	return sqlite3_last_insert_rowid(iDbHandle);
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	}
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//Check that the caller has at least one of {Read, Write, Schema} policies and leave with 
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//KErrPermissionDenied if it is not true.
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//The "schema" policy check should be evaluated last in order to prevent too many platsec warnings reported in the log files.
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//(It is very likely that the caller has either "read", "write" or both database security policies)
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inline void CSqlSrvDatabase::BasicSecurityPolicyCheckL(const CSqlSecurityPolicy& aSecurityPolicy)
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	{
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	MSqlPolicyInspector& inspector = ::SqlServer().SecurityInspector();
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	if(!(inspector.Check(aSecurityPolicy.DbPolicy(RSqlSecurityPolicy::EReadPolicy)) ||
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	     inspector.Check(aSecurityPolicy.DbPolicy(RSqlSecurityPolicy::EWritePolicy))||
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	     inspector.Check(aSecurityPolicy.DbPolicy(RSqlSecurityPolicy::ESchemaPolicy))))
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	     	{
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	     	__SQLLEAVE(KErrPermissionDenied);		
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	     	}
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	}
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/**
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Current database connection transaction state.
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@return True, the current database connection is in transaction, false otherwise.
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*/
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inline TBool CSqlSrvDatabase::InTransaction() const
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	{
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	return !sqlite3_get_autocommit(iDbHandle);		
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	}
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