databasefile.h

有计算机图形学、图像处理、dbms、sniffer、中游俄罗斯外挂、othello、遗传算法、舌苔分析等程序。

// DatabaseFile.h: interface for the CDatabaseFile class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_DATABASEFILE_H__79D14798_F1CA_49FB_8516_40B766248D4E__INCLUDED_)
#define AFX_DATABASEFILE_H__79D14798_F1CA_49FB_8516_40B766248D4E__INCLUDED_

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

#include "Block.h"
#include "Record.h"
#include "Memory.h"
#include "Relationship.h"
#include "Update.h" 
struct Space
{
	UINT uOffset;//偏移
	UINT uLarge;
    Space *next;

	Space()
	{
	}
	Space(UINT uo,UINT ul):uOffset(uo),uLarge(ul)
	{
		next=NULL;
	}
};//写入文件八个字节

class Record;
class Relationship;
class CDatabaseFile 
{
	//魔数4字节
    WORD wBlockNum;
	UINT end;
	UINT start;
	UINT NextFile;
public:
    UINT ID;
	//第一个空闲区偏移UINT
	//第一个空闲区大小UINT
	//以上占4096字节

	
	Space *sfirst;
	Space *slast;
public:
	//Record UpdateRecord(PDB db_addr,CUpdate up,Relationship *R);
	virtual void Close();
	Record *DeleteRecord(PDB db_addr,Relationship *R ,bool bRet);//只能由CBlock负责通知CMemory删除记录号
	int GetTime();
	//void AddSpace(Space *s);
	void InsertSpace(Space *s);
	void DeleteSpace(Space *s);
	BOOL InsertRecord(Space *s,Record *r/*,Relationship *R*/);//可能要改变文件尾
	PDB Allocate(Record *rcd,Relationship *R);
	CDatabaseFile();
	
	CDatabaseFile(LPCTSTR lpszFileName, UINT nOpenFlags,UINT id=0);//throw( CFileException );
    	
	virtual ~CDatabaseFile();

};

#endif // !defined(AFX_DATABASEFILE_H__79D14798_F1CA_49FB_8516_40B766248D4E__INCLUDED_)