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75 lines
2.0 KiB
75 lines
2.0 KiB
///////////////////////////////////////////////////////////////////////////////
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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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// dsenum.h
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//
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// SYNOPSIS
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//
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// This file declares the class DBEnumerator.
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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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#ifndef _DSENUM_H_
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#define _DSENUM_H_
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#include <dsobject.h>
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#include <objcmd.h>
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#include <oledbstore.h>
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///////////////////////////////////////////////////////////////////////////////
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//
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// CLASS
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//
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// DBEnumerator
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//
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// DESCRIPTION
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//
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// This class implements IEnumVARIANT for a rowset of objects.
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//
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///////////////////////////////////////////////////////////////////////////////
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class DBEnumerator : public IEnumVARIANT
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{
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public:
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DBEnumerator(DBObject* container, IRowset* members);
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~DBEnumerator() { Bind::releaseAccessor(items, readAccess); }
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//////////
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// IUnknown
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//////////
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STDMETHOD_(ULONG, AddRef)();
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STDMETHOD_(ULONG, Release)();
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STDMETHOD(QueryInterface)(const IID& iid, void** ppv);
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//////////
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// IEnumVARIANT
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//////////
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STDMETHOD(Next)(/*[in]*/ ULONG celt,
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/*[length_is][size_is][out]*/ VARIANT* rgVar,
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/*[out]*/ ULONG* pCeltFetched);
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STDMETHOD(Skip)(/*[in]*/ ULONG celt);
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STDMETHOD(Reset)();
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STDMETHOD(Clone)(/*[out]*/ IEnumVARIANT** ppEnum);
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protected:
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LONG refCount; // Interface ref count.
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CComPtr<DBObject> parent; // The container being enumerated.
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Rowset items; // Items in the container.
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HACCESSOR readAccess; // Accessor for reading rows.
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ULONG identity; // Identity buffer.
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WCHAR name[OBJECT_NAME_LENGTH]; // Name buffer.
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BEGIN_BIND_MAP(DBEnumerator, ReadAccessor, DBACCESSOR_ROWDATA)
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BIND_COLUMN(identity, 1, DBTYPE_I4),
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BIND_COLUMN(name, 2, DBTYPE_WSTR)
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END_BIND_MAP()
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};
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#endif // _DSENUM_H_
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