rsvarcol.h

clips专家系统内核打包类,很有参考性.

#ifndef _RSVARCOL_H_
#define _RSVARCOL_H_
//
// rsvarcol.h : header file
//
//******************************************************************
// PROJECT NAME:	SQLPRC                                         
// MODULE NAME:		RSVARCOL.H                                     
// AUTHOR:			Phillip N. Jacobs
// DESCRIPTION:		Variable-column recordset class definition
// HISTORY:
//	DATE	INITIALS	DESCRIPTION
//	----	--------	--------------------------------------------
// 08/22/95		PNJ		Initial version.
// 06/02/97		MJG		Port to VC++ 4.2/5.0
//******************************************************************

/////////////////////////////////////////////////////////////////////////////
// CVarRecordset recordset

class CVarRecordset : public CRecordset
{
public:
	CVarRecordset(CDatabase* pdb = NULL);	//Constructor
	DECLARE_DYNAMIC(CVarRecordset)
	
// Interface
public:
	SWORD GetNumCols();	// Number of columns
	CString GetColName(const SWORD nCol);	// Column name
	SWORD GetColType(const SWORD nCol);		// Column type
	CString GetColTypeName(const SWORD nCol);	// Column type name
	UDWORD GetColPrec(const SWORD nCol);	// Column precision
	SWORD GetColScale(const SWORD nCol);	// Column scale
	SWORD IsColNullable(const SWORD nCol);	// Column nullable flag
	CString GetColResult(const SWORD nCol);	// Column result

// CRecordset pure virtual functions
	virtual CString GetDefaultConnect();	// Default connection string
	virtual CString GetDefaultSQL(); 	// Default SQL for Recordset
	virtual void DoFieldExchange(CFieldExchange* pFX);	// RFX support

// Overrides
public:
	virtual void PreBindFields();	// To obtain column attributes
	virtual void Move(long lRows, WORD wFetchType);	// To fetch column results

// Implementation
#ifdef _DEBUG
	virtual void AssertValid() const;
	virtual void Dump(CDumpContext& dc) const;
#endif

private:
	SWORD m_nCols;	// Number of columns in the result set
	CWordArray m_wTypeArray;	// Type of each column
	CWordArray m_wScaleArray;	// Scale of each column
	CWordArray m_wNullableArray;// Nullable flag of each column
	CDWordArray m_dwPrecArray;	// Precision of each column
	CStringArray m_strColNameArray;// Name of each column
	CStringArray m_strTypeNameArray;// Type name of each column
	CStringArray m_strResultArray;	// Current row's results
};
#endif // _RSVARCOL_H_