619 lines
15 KiB
C++
619 lines
15 KiB
C++
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///////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 1997, Microsoft Corp. All rights reserved.
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//
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// FILE
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//
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// SimTable.cpp
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//
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// SYNOPSIS
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//
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// This file implements 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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// 02/27/1998 Changes to support moving it into the iasutil.lib
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// 10/16/1998 Support DBTYPE_WSTR.
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//
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///////////////////////////////////////////////////////////////////////////////
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#include <windows.h>
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#include <comdef.h>
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#include <iasutil.h>
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#include <oledberr.h>
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#include <SimTable.h>
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//////////
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// Stack version of the new operator.
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//////////
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#define stack_new(obj, num) new (_alloca(sizeof(obj)*num)) obj[num]
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///////////////////////////////////////////////////////////////////////////////
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//
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// STRUCT
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//
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// DBBinding
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//
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// DESCRIPTION
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//
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// This struct extends the DBBINDING struct to provide functionality
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// to initialize the struct from a DBCOLUMNINFO struct.
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//
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///////////////////////////////////////////////////////////////////////////////
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struct DBBinding : DBBINDING
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{
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//////////
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// 'offset' is the offset in bytes of this column's data within the
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// row buffer.
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//////////
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void Initialize(DBCOLUMNINFO& columnInfo, DBBYTEOFFSET& offset)
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{
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iOrdinal = columnInfo.iOrdinal;
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obValue = offset;
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obLength = offset + columnInfo.ulColumnSize;
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obStatus = obLength + sizeof(DBLENGTH);
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pTypeInfo = NULL;
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pObject = NULL;
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pBindExt = NULL;
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dwPart = DBPART_VALUE | DBPART_LENGTH | DBPART_STATUS;
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eParamIO = DBPARAMIO_NOTPARAM;
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dwMemOwner = (columnInfo.wType & DBTYPE_BYREF) ? DBMEMOWNER_PROVIDEROWNED
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: DBMEMOWNER_CLIENTOWNED;
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cbMaxLen = columnInfo.ulColumnSize;
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dwFlags = 0;
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wType = columnInfo.wType;
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bPrecision = columnInfo.bPrecision;
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bScale = columnInfo.bScale;
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offset = obStatus + sizeof(DBSTATUS);
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}
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};
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///////////////////////////////////////////////////////////////////////////////
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//
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// METHOD
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//
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// CSimpleTable::CSimpleTable
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//
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// DESCRIPTION
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//
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// Constructor.
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//
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///////////////////////////////////////////////////////////////////////////////
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CSimpleTable::CSimpleTable()
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: numColumns(0),
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columnInfo(NULL),
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stringsBuffer(NULL),
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columnBinding(NULL),
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readAccess(NULL),
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buffer(NULL),
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numRows(0),
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currentRow(0),
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endOfRowset(false)
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{
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// METHOD
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//
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// CSimpleTable::~CSimpleTable
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//
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// DESCRIPTION
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//
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// Destructor.
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//
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///////////////////////////////////////////////////////////////////////////////
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CSimpleTable::~CSimpleTable()
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{
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Detach();
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// METHOD
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//
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// CSimpleTable::Attach
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//
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// DESCRIPTION
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//
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// This method binds the table object to a new rowset. The previous rowset
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// (if any) will be detached.
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//
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///////////////////////////////////////////////////////////////////////////////
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HRESULT CSimpleTable::Attach(IRowset* pRowset)
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{
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// Make sure we didn't get a null pointer.
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if (!pRowset) { return E_POINTER; }
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// Detach the current rowset.
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Detach();
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// We don't care if this returns an error. It will just prevent
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// the user from updating.
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pRowset->QueryInterface(IID_IRowsetChange, (void**)&rowsetChange);
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//////////
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// Get the column information for the table.
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//////////
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CComPtr<IColumnsInfo> ColumnsInfo;
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RETURN_ERROR(pRowset->QueryInterface(IID_IColumnsInfo,
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(void**)&ColumnsInfo));
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RETURN_ERROR(ColumnsInfo->GetColumnInfo(&numColumns,
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&columnInfo,
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&stringsBuffer));
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//////////
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// Allocate the per-column data.
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//////////
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try
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{
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columnBinding = new DBBinding[numColumns];
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dirty.resize(numColumns);
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}
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catch (std::bad_alloc)
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{
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return E_OUTOFMEMORY;
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}
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//////////
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// Create a binding for each column.
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//////////
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bufferLength = 0;
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for (DBORDINAL i = 0; i < numColumns; ++i)
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{
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// Compute the width of the column.
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DBLENGTH width = columnInfo[i].ulColumnSize;
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// Add room for the null terminator.
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if (columnInfo[i].wType == DBTYPE_STR)
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{
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width += 1;
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}
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else if (columnInfo[i].wType == DBTYPE_WSTR)
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{
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width = (width + 1) * sizeof(WCHAR);
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}
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// Round to an 8-byte boundary (could peek ahead and be more efficient).
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width = (width + 7) >> 3 << 3;
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columnInfo[i].ulColumnSize = width;
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// We're using the pTypeInfo element to store the offset to our data.
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// We have to store the offset now, since it will be overwritten by
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// DBBinding::Initialize.
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columnInfo[i].pTypeInfo = (ITypeInfo*)bufferLength;
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columnBinding[i].Initialize(columnInfo[i], bufferLength);
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}
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//////////
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// Allocate a buffer for the row data.
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//////////
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buffer = new (std::nothrow) BYTE[bufferLength];
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if (!buffer) { return E_OUTOFMEMORY; }
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//////////
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// Create an accessor.
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//////////
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RETURN_ERROR(pRowset->QueryInterface(IID_IAccessor,
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(void**)&accessor));
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RETURN_ERROR(accessor->CreateAccessor(DBACCESSOR_ROWDATA,
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numColumns,
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columnBinding,
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bufferLength,
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&readAccess,
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NULL));
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// I used this hokey method of assigning the pointer to avoid a
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// dependency on atlimpl.cpp
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//
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// We do this assignment last, so that the presence of a rowset means the
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// entire initialization succeeded.
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(rowset.p = pRowset)->AddRef();
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endOfRowset = false;
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return S_OK;
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// METHOD
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//
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// CSimpleTable::Detach
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//
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// DESCRIPTION
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//
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// Frees all the resources associated with the current rowset.
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//
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///////////////////////////////////////////////////////////////////////////////
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IRowset* CSimpleTable::Detach()
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{
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ReleaseRows();
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delete[] buffer;
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buffer = NULL;
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delete[] columnBinding;
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columnBinding = NULL;
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CoTaskMemFree(columnInfo);
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columnInfo = NULL;
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CoTaskMemFree(stringsBuffer);
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stringsBuffer = NULL;
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accessor.Release();
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rowsetChange.Release();
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IRowset* temp = rowset;
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rowset.Release();
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return temp;
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// METHOD
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//
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// CSimpleTable::MoveFirst
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//
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// DESCRIPTION
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//
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// Positions the cursor over the first row in the rowset.
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//
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///////////////////////////////////////////////////////////////////////////////
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HRESULT CSimpleTable::MoveFirst()
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{
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if (rowset == NULL) return E_FAIL;
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ReleaseRows();
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RETURN_ERROR(rowset->RestartPosition(NULL));
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endOfRowset = false;
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return MoveNext();
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// METHOD
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//
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// CSimpleTable::MoveNext
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//
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// DESCRIPTION
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//
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// Positions the cursor over the next row in the rowset.
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//
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///////////////////////////////////////////////////////////////////////////////
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HRESULT CSimpleTable::MoveNext()
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{
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// If the data wasn't opened successfully then fail
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if (rowset == NULL) return E_FAIL;
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// Too late to save any changes.
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DiscardChanges();
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// If we've used all the rows from the last fetch, then get some more.
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if (++currentRow >= numRows)
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{
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ReleaseRows();
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// We have to do this check here, since some providers automatically
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// reset to the beginning of the rowset.
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if (endOfRowset) { return DB_S_ENDOFROWSET; }
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HROW* pRow = row;
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HRESULT hr = rowset->GetNextRows(NULL,
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0,
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FETCH_QUANTUM,
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&numRows,
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&pRow);
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if (hr == DB_S_ENDOFROWSET)
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{
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// Mark that we've reached the end of the rowset.
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endOfRowset = true;
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// If we didn't get any rows, then we're really at the end.
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if (numRows == 0) { return DB_S_ENDOFROWSET; }
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}
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else if (FAILED(hr))
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{
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return hr;
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}
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}
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// Load the data into the buffer.
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RETURN_ERROR(rowset->GetData(row[currentRow], readAccess, buffer));
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return S_OK;
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}
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///////////////////////////////////////////////////////////////////////////////
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//
|
||
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// METHOD
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//
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||
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// CSimpleTable::Insert
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//
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// DESCRIPTION
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//
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// Inserts the contents of the accessor buffer into the rowset.
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//
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///////////////////////////////////////////////////////////////////////////////
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HRESULT CSimpleTable::Insert()
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{
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// Is a rowset attached?
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if (!rowset) { return E_FAIL; }
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// Does this rowset support changes?
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if (!rowsetChange) { return E_NOINTERFACE; }
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// Get an accessor for the dirty columns.
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HACCESSOR writeAccess;
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RETURN_ERROR(CreateAccessorForWrite(&writeAccess));
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// Release the existing rows to make room for the new one.
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ReleaseRows();
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HRESULT hr = rowsetChange->InsertRow(NULL, writeAccess, buffer, row);
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if (SUCCEEDED(hr))
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{
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// The changes were save successfully, so reset the dirty vector.
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DiscardChanges();
|
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// We now have exactly one row in our buffer.
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numRows = 1;
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}
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// Release the accessor.
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accessor->ReleaseAccessor(writeAccess, NULL);
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return hr;
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||
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}
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||
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|
||
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|
|
||
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///////////////////////////////////////////////////////////////////////////////
|
||
|
|
//
|
||
|
|
// METHOD
|
||
|
|
//
|
||
|
|
// CSimpleTable::Delete
|
||
|
|
//
|
||
|
|
// DESCRIPTION
|
||
|
|
//
|
||
|
|
// Deletes the current row from the rowset.
|
||
|
|
//
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
HRESULT CSimpleTable::Delete()
|
||
|
|
{
|
||
|
|
// Are we positioned over a valid row?
|
||
|
|
if (!rowset || currentRow >= numRows) { return E_FAIL; }
|
||
|
|
|
||
|
|
// Does this rowset support changes?
|
||
|
|
if (!rowsetChange) { return E_NOINTERFACE; }
|
||
|
|
|
||
|
|
DBROWSTATUS rowStatus[1];
|
||
|
|
|
||
|
|
return rowsetChange->DeleteRows(NULL, 1, row + currentRow, rowStatus);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
//
|
||
|
|
// METHOD
|
||
|
|
//
|
||
|
|
// CSimpleTable::SetData
|
||
|
|
//
|
||
|
|
// DESCRIPTION
|
||
|
|
//
|
||
|
|
// Updates the current row with the data in the accessor buffer.
|
||
|
|
//
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
HRESULT CSimpleTable::SetData()
|
||
|
|
{
|
||
|
|
// Are we positioned over a valid row?
|
||
|
|
if (!rowset || currentRow >= numRows) { return E_FAIL; }
|
||
|
|
|
||
|
|
// Does this rowset support changes?
|
||
|
|
if (!rowsetChange) { return E_NOINTERFACE; }
|
||
|
|
|
||
|
|
// Get an accessor for the dirty columns.
|
||
|
|
HACCESSOR writeAccess;
|
||
|
|
RETURN_ERROR(CreateAccessorForWrite(&writeAccess));
|
||
|
|
|
||
|
|
HRESULT hr = rowsetChange->SetData(row[currentRow], writeAccess, buffer);
|
||
|
|
|
||
|
|
if (SUCCEEDED(hr))
|
||
|
|
{
|
||
|
|
// The changes were save successfully, so reset the dirty vector.
|
||
|
|
DiscardChanges();
|
||
|
|
}
|
||
|
|
|
||
|
|
// Release the accessor.
|
||
|
|
accessor->ReleaseAccessor(writeAccess, NULL);
|
||
|
|
|
||
|
|
return hr;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
//
|
||
|
|
// METHOD
|
||
|
|
//
|
||
|
|
// CSimpleTable::GetLength
|
||
|
|
//
|
||
|
|
// DESCRIPTION
|
||
|
|
//
|
||
|
|
// Returns the length of the current value for a given column.
|
||
|
|
//
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
DBLENGTH CSimpleTable::GetLength(DBORDINAL nOrdinal) const
|
||
|
|
{
|
||
|
|
return *(DBLENGTH*)((BYTE*)_GetDataPtr(nOrdinal) +
|
||
|
|
columnInfo[OrdinalToColumn(nOrdinal)].ulColumnSize);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
//
|
||
|
|
// METHOD
|
||
|
|
//
|
||
|
|
// CSimpleTable::GetOrdinal
|
||
|
|
//
|
||
|
|
// DESCRIPTION
|
||
|
|
//
|
||
|
|
// Returns the ordinal for a given column name.
|
||
|
|
//
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
bool CSimpleTable::GetOrdinal(LPCWSTR szColumnName, DBORDINAL* pOrdinal) const
|
||
|
|
{
|
||
|
|
for (DBORDINAL i = 0; i < numColumns; ++i)
|
||
|
|
{
|
||
|
|
if (lstrcmpW(columnInfo[i].pwszName, szColumnName) == 0)
|
||
|
|
{
|
||
|
|
*pOrdinal = columnInfo[i].iOrdinal;
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
//
|
||
|
|
// METHOD
|
||
|
|
//
|
||
|
|
// CSimpleTable::GetStatus
|
||
|
|
//
|
||
|
|
// DESCRIPTION
|
||
|
|
//
|
||
|
|
// Returns the status code associated with the current value of a column.
|
||
|
|
//
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
DBSTATUS CSimpleTable::GetStatus(DBORDINAL nOrdinal) const
|
||
|
|
{
|
||
|
|
return *(DBSTATUS*)((BYTE*)_GetDataPtr(nOrdinal) +
|
||
|
|
columnInfo[OrdinalToColumn(nOrdinal)].ulColumnSize +
|
||
|
|
sizeof(DBLENGTH));
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
//
|
||
|
|
// METHOD
|
||
|
|
//
|
||
|
|
// CSimpleTable::CreateAccessorForWrite
|
||
|
|
//
|
||
|
|
// DESCRIPTION
|
||
|
|
//
|
||
|
|
// Creates an accessor that is only to bound to columns that have been
|
||
|
|
// modified.
|
||
|
|
//
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
HRESULT CSimpleTable::CreateAccessorForWrite(HACCESSOR* phAccessor)
|
||
|
|
{
|
||
|
|
//////////
|
||
|
|
// Allocate temporary space for the bindings.
|
||
|
|
//////////
|
||
|
|
|
||
|
|
DBBINDING* writeBind = stack_new(DBBINDING, dirty.count());
|
||
|
|
|
||
|
|
//////////
|
||
|
|
// Load in all the dirty columns.
|
||
|
|
//////////
|
||
|
|
|
||
|
|
size_t total = 0;
|
||
|
|
|
||
|
|
for (size_t i = 0; total < dirty.count(); ++i)
|
||
|
|
{
|
||
|
|
if (dirty.test(i))
|
||
|
|
{
|
||
|
|
// We only want to bind the value.
|
||
|
|
(writeBind[total++] = columnBinding[i]).dwPart = DBPART_VALUE;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//////////
|
||
|
|
// Create the accessor.
|
||
|
|
//////////
|
||
|
|
|
||
|
|
return accessor->CreateAccessor(DBACCESSOR_ROWDATA,
|
||
|
|
dirty.count(),
|
||
|
|
writeBind,
|
||
|
|
bufferLength,
|
||
|
|
phAccessor,
|
||
|
|
NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
//
|
||
|
|
// METHOD
|
||
|
|
//
|
||
|
|
// CSimpleTable::_GetDataPtr
|
||
|
|
//
|
||
|
|
// DESCRIPTION
|
||
|
|
//
|
||
|
|
// Non-const version of _GetDataPtr. Marks the target column as dirty.
|
||
|
|
//
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
void* CSimpleTable::_GetDataPtr(DBORDINAL nOrdinal)
|
||
|
|
{
|
||
|
|
DBORDINAL nColumn = OrdinalToColumn(nOrdinal);
|
||
|
|
|
||
|
|
dirty.set(nColumn);
|
||
|
|
|
||
|
|
return buffer + (ULONG_PTR)columnInfo[nColumn].pTypeInfo;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
//
|
||
|
|
// METHOD
|
||
|
|
//
|
||
|
|
// CSimpleTable::ReleaseRows
|
||
|
|
//
|
||
|
|
// DESCRIPTION
|
||
|
|
//
|
||
|
|
// Releases all the rows returned by the last fetch.
|
||
|
|
//
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
HRESULT CSimpleTable::ReleaseRows()
|
||
|
|
{
|
||
|
|
if (rowset != NULL)
|
||
|
|
{
|
||
|
|
HRESULT hr = rowset->ReleaseRows(numRows, row, NULL, NULL, NULL);
|
||
|
|
|
||
|
|
currentRow = numRows = 0;
|
||
|
|
|
||
|
|
return hr;
|
||
|
|
}
|
||
|
|
|
||
|
|
return S_OK;
|
||
|
|
}
|