record.h

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// Record.h: interface for the Record class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_RECORD_H__EB77A4C5_0CC5_4A09_A3A0_82556CB2E00A__INCLUDED_)
#define AFX_RECORD_H__EB77A4C5_0CC5_4A09_A3A0_82556CB2E00A__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include "ANY.h"
#include "AFX.h"
#include "Relationship.h"
#include "Update.h"
#include "Condition.h"
#include "KEY.h"	// Added by ClassView
#include "NormalForm.h"
class Relationship;
class CCondition;
struct AttrItem
{
    BYTE type;
	UINT uOffset;
	AttrItem()
	{
		type=0;
		uOffset=0;
	}
	AttrItem(BYTE t,UINT uoff)
	{
		type=t;
		uOffset=uoff;
	}
};

class Record  
{
	//非跨块记录首部格式为
	//长度(UINT),是否存在(BYTE),记录ID(UINT),时间戳(int)
	//长度只包括记录体
	//共13字节

	
public:
	BOOL AddValues(CString *values);
	void Draw(UINT Count,CListCtrl &List,Relationship *R1,Relationship *R2,BYTE mask[]);
	KEY AttrToKey(WORD pos);
	Record * Shadow(BYTE *mask,Relationship *pR1=NULL,Relationship *pR2=NULL);
	unsigned short Hash();
	BOOL operator < (const Record &R2);
	BOOL operator ==(const Record &R2);
	Record * operator +(const Record &rcd2);

	BOOL Fit(CNormalForm &Form);
	BOOL Fit(WORD AttrNo,CString AttrValue);
	ANY AttrToValue(WORD pos);
	CString AttrToString(WORD pos,Relationship *pR1=NULL,Relationship *pR2=NULL);
	UINT ID;
	UINT m_length;//对varchar字符串,包括了/0和长度标志
    int time;
	Relationship *pattern;//关系模式
	//ANY *body;//body[0]废弃
	BYTE *body;
	//Record *forward;

	Record();
	Record &operator =(const Record &rcd);
	Record(Relationship *r);
	Record(WORD AN,UINT Length);
	//Record(CBlock *cb,OffsetTerm *o);
	UINT GetAttrNum();
	UINT GetHalfLength(WORD &half_attr_num);//得到最接近一半的长度 
	void Update(const CUpdate &update);
	BOOL AddValue(CString v,UINT i);
	//BYTE * RecordToByte();
	Record * Split();
	virtual ~Record();

};


#endif // !defined(AFX_RECORD_H__EB77A4C5_0CC5_4A09_A3A0_82556CB2E00A__INCLUDED_)