107 lines
4 KiB
C++
107 lines
4 KiB
C++
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//+-------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1998 - 1998.
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//
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// File: odbvarnt.hxx
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//
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// Contents: Helper class for PROPVARIANTs, OLE-DB variant types and
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// Automation variant types in tables
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//
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// Classes: COLEDBVariant - derives from CTableVariant
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//
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// History: 09 Jan 1998 VikasMan Created
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//
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//--------------------------------------------------------------------------
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#pragma once
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#include <tblvarnt.hxx>
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// forward declaration for OLE DB data conversion interface
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interface IDataConvert;
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//+-------------------------------------------------------------------------
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//
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// Class: COLEDBVariant
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//
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// Purpose: Derives from CTableVariant - adds functionality to convert
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// to/from OLE DB types and Automation variants. This class will
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// normally be used on the client side, while CTableVariant class
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// will normally be used on the server side.
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//
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// Interface:
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//
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// Notes: Because the underlying base data *is* a variant, this
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// class cannot have any non-static members (including
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// a vtable).
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//
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// For various conversions to OLE-DB types, this class uses
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// the OLEDB data conversion library(MSDADC.DLL).
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//
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// For additional info. refer to the notes section in the
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// CTableVariant class.
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//
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// History: 09 Jan 1998 VikasMan Created
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//
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//--------------------------------------------------------------------------
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class COLEDBVariant: public CTableVariant
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{
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public:
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DBSTATUS OLEDBConvert(
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BYTE * pbDest,
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DBLENGTH cbDest,
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VARTYPE vtDest,
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PVarAllocator & rVarAllocator,
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DBLENGTH & rcbDstLen,
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XInterface<IDataConvert>& xDataConvert,
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BOOL fExtTypes = TRUE,
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BYTE bPrecision = 0,
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BYTE bScale = 0 ) const;
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static BOOL CanConvertType(DBTYPE wFromType,
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DBTYPE wToType,
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XInterface<IDataConvert>& xDataConvert);
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DBSTATUS GetDstLength(
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XInterface<IDataConvert>& xDataConvert,
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DBTYPE dbtypeDst,
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DBLENGTH & rcbDstLen );
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private:
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HRESULT _GetOLEDBType( VARTYPE vt, DBTYPE& dbtype ) const;
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void * _GetDataPointer() const;
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DBSTATUS _CopyToOAVariant( VARIANT * pDest,
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PVarAllocator & rVarAllocator) const;
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DBSTATUS _StoreSimpleTypeArray( SAFEARRAY ** pbDstBuf) const;
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DBSTATUS _StoreLPSTRArray( SAFEARRAY ** pbDstBuf,
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PVarAllocator & rPool) const;
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DBSTATUS _StoreLPWSTRArray( SAFEARRAY ** pbDstBuf,
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PVarAllocator & rPool) const;
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DBSTATUS _StoreBSTRArray( SAFEARRAY ** pbDstBuf,
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PVarAllocator & rPool) const;
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DBSTATUS _StoreDecimalArray( SAFEARRAY ** pbDstBuf) const;
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DBSTATUS _StoreIntegerArray( VARTYPE vtDst,
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SAFEARRAY ** pbDstBuf) const;
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DBSTATUS _StoreVariantArray( SAFEARRAY ** pbDstBuf,
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PVarAllocator & rPool) const;
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DBSTATUS _StoreDateArray( SAFEARRAY ** pbDstBuf) const;
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DBSTATUS _StoreDate(BYTE * pbDstBuf,
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DBLENGTH cbDstBuf,
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VARTYPE vtDst,
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LONG lElem = 0) const;
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static BOOL _GetIDataConvert( XInterface<IDataConvert>& xDataConvert );
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};
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inline BOOL DBStatusOK( DBSTATUS DstStatus)
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{
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return ( DBSTATUS_S_OK == DstStatus ||
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DBSTATUS_S_ISNULL == DstStatus ||
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DBSTATUS_S_TRUNCATED == DstStatus );
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}
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