Реферат: Блокировки в MS SQL Server 2000

};

class CObject

{

friend class CProxy;

public:

enum {

#ifdef MSSQL

READ_UNCOMMITTED,

#elif defined ORACLE

SNAP_SHOT,

#endif

READ_COMMITTED,REPEATABLE_READ,UPDLOCK,XLOCK};

static CProxy& GetObject(int level = -1);

~CObject()

{

DeleteCriticalSection(&exclusive);

DeleteCriticalSection(&update);

if (hShared) CloseHandle(hShared);

if (hMutex) CloseHandle(hMutex);

}

protected:

CProxy& BeginTran(int level)

{

return *(new CProxy(this,level));

}

void RequestExclusive(int level)

{

ATLASSERT(level <= REPEATABLE_READ);

#ifdef MSSQL