84 lines
2 KiB
C++
84 lines
2 KiB
C++
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///////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 1998, Microsoft Corp. All rights reserved.
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//
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// FILE
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//
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// bind.cpp
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//
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// SYNOPSIS
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//
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// This file defines various helper functions for binding an OLE-DB
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// accessor to the members of a class.
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//
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// MODIFICATION HISTORY
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//
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// 02/20/1998 Original version.
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//
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///////////////////////////////////////////////////////////////////////////////
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#include <ias.h>
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#include <oledb.h>
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#include <bind.h>
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DBLENGTH Bind::getRowSize(
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DBCOUNTITEM cBindings,
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const DBBINDING rgBindings[]
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) throw ()
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{
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DBLENGTH rowSize = 0;
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while (cBindings--)
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{
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DBLENGTH end = rgBindings->obValue + rgBindings->cbMaxLen;
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if (end > rowSize) { rowSize = end; }
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++rgBindings;
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}
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return rowSize;
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}
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HACCESSOR Bind::createAccessor(IUnknown* pUnk,
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DBACCESSORFLAGS dwAccessorFlags,
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DBCOUNTITEM cBindings,
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const DBBINDING rgBindings[],
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DBLENGTH cbRowSize)
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{
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using _com_util::CheckError;
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CComPtr<IAccessor> accessor;
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CheckError(pUnk->QueryInterface(__uuidof(IAccessor), (PVOID*)&accessor));
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HACCESSOR h;
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CheckError(accessor->CreateAccessor(dwAccessorFlags,
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cBindings,
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rgBindings,
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cbRowSize,
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&h,
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NULL));
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return h;
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}
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// Releases an accessor on the pUnk object.
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void Bind::releaseAccessor(IUnknown* pUnk, HACCESSOR hAccessor) throw ()
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{
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if (pUnk && hAccessor)
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{
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IAccessor* accessor;
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HRESULT hr = pUnk->QueryInterface(__uuidof(IAccessor),
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(PVOID*)&accessor);
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if (SUCCEEDED(hr))
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{
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accessor->ReleaseAccessor(hAccessor, NULL);
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accessor->Release();
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}
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}
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}
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