162 lines
4.1 KiB
C++
162 lines
4.1 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 1997-1999, Microsoft Corp. All rights reserved.
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//
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// FILE
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//
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// SimTable.h
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//
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// SYNOPSIS
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//
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// This file describes the class CSimpleTable
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//
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// MODIFICATION HISTORY
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//
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// 10/31/1997 Original version.
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// 02/09/1998 Reorganized some things to make is easier to extend.
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// Thierry Perraut
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//
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///////////////////////////////////////////////////////////////////////////////
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#ifndef _SIMTABLE_H_
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#define _SIMTABLE_H_
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#include <atlbase.h>
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#include <oledb.h>
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#include <bitvec.h>
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struct DBBinding;
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///////////////////////////////////////////////////////////////////////////////
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//
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// CLASS
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//
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// CSimpleTable
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//
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// DESCRIPTION
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//
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// This class provides a simple read-only wrapper for iterating through a
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// rowset and retrieving information. The interface is based on the ATL
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// CTable<> class. I kept all the function signatures the same, so the two
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// should be almost interchangeable. The main difference is that CTable<>
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// opens a table and retrieves a rowset, while CSimpleTable is handed a
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// rowset that was retrieved elsewhere.
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//
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///////////////////////////////////////////////////////////////////////////////
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class CSimpleTable
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{
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public:
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CSimpleTable();
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~CSimpleTable();
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HRESULT Attach(IRowset* pRowset);
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IRowset* Detach();
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HRESULT MoveFirst();
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HRESULT MoveNext();
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HRESULT Insert();
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HRESULT Delete();
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HRESULT SetData();
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void DiscardChanges()
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{
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dirty.reset();
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}
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DBORDINAL GetColumnCount() const
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{
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return numColumns;
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}
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DBCOLUMNFLAGS GetColumnFlags(DBORDINAL nOrdinal) const
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{
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return columnInfo[OrdinalToColumn(nOrdinal)].dwFlags;
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}
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LPCWSTR GetColumnName(DBORDINAL nOrdinal) const
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{
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return columnInfo[OrdinalToColumn(nOrdinal)].pwszName;
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}
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DBTYPE GetColumnType(DBORDINAL nOrdinal) const
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{
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return columnInfo[OrdinalToColumn(nOrdinal)].wType;
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}
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DBLENGTH GetLength(DBORDINAL nOrdinal) const;
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bool GetOrdinal(LPCWSTR szColumnName, DBORDINAL* pOrdinal) const;
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DBSTATUS GetStatus(DBORDINAL nOrdinal) const;
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const void* GetValue(DBORDINAL nOrdinal) const
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{
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return _GetDataPtr(nOrdinal);
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}
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template <class T>
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void SetValue(DBORDINAL nOrdinal, const T& t)
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{
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*(T*)_GetDataPtr(nOrdinal) = t;
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}
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template <>
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void SetValue(DBORDINAL nOrdinal, PCSTR szValue)
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{
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strcpy((PSTR)_GetDataPtr(nOrdinal), szValue);
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}
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template <>
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void SetValue(DBORDINAL nOrdinal, PSTR szValue)
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{
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strcpy((PSTR)_GetDataPtr(nOrdinal), szValue);
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}
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bool HasBookmark() const
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{
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return (numColumns > 0) && (columnInfo->iOrdinal == 0);
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}
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protected:
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enum { FETCH_QUANTUM = 256 }; // The number of rows fetched at a time.
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HRESULT CreateAccessorForWrite(HACCESSOR* phAccessor);
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void* _GetDataPtr(DBORDINAL nOrdinal);
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const void* _GetDataPtr(DBORDINAL nOrdinal) const
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{
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return buffer +
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(ULONG_PTR)columnInfo[OrdinalToColumn(nOrdinal)].pTypeInfo;
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}
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HRESULT ReleaseRows();
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DBORDINAL OrdinalToColumn(DBORDINAL nOrdinal) const
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{
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return nOrdinal -= columnInfo->iOrdinal;
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}
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// Various representations of the rowset being manipulated.
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CComPtr<IRowset> rowset;
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CComPtr<IAccessor> accessor;
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CComPtr<IRowsetChange> rowsetChange;
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DBORDINAL numColumns; // Number of columns in the table.
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DBCOLUMNINFO* columnInfo; // Column info.
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OLECHAR* stringsBuffer; // Buffer used by columnInfo.
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DBBinding* columnBinding; // Column bindings.
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HACCESSOR readAccess; // Handle for read accessor.
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PBYTE buffer; // Accessor buffer.
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DBLENGTH bufferLength; // Length of accessor buffer.
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HROW row[FETCH_QUANTUM]; // Array of row handles.
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DBCOUNTITEM numRows; // Number of rows in the row array.
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DBCOUNTITEM currentRow; // Current row being accessed.
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BitVector dirty; // Columns that have been modified.
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bool endOfRowset; // True if we've reached the end of the rowset.
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};
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#endif // _SIMTABLE_H_
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