tddatabase.h

来自「This a simple database management system」· C头文件 代码 · 共 54 行

#pragma once
#include <stdio.h>
#include "TDDBStructs.h"
#include "TDRecord.h"

#define TDDB_OK						0
#define TDDBERR_READ_ERROR			1
#define TDDBERR_COULD_NOT_OPEN		2
#define TDDBERR_NO_COLUMNS			3
#define TDDBERR_FILE_NOT_FOUND		4
#define TDDBERR_WRITE_ERROR			5
#define TDDBERR_PREPARE_ERROR		6
#define TDDBERR_INVALID_RECORD		7
#define TDDBERR_SEEK_ERROR			8
#define TDDBERR_DATABASE_NOT_OPEN	9


const char* TDDB_ErrorCodeToString( int iErrorCode );

class CTDDatabase
{
////////////////////////////////////////////////////////////////////////
//	Public Interface
////////////////////////////////////////////////////////////////////////
public:
	CTDDatabase(void);
	~CTDDatabase(void);

	int Open( const char* szFileName );
	int Close( void );
	int IsOpen( void );
	int CreateNew( const char* szFileName, TDDBTable* tableDef );

	CTDRecord CreateRecord( void );
	int GetRecord( CTDRecord* recordOut, unsigned int iIndex );
	int SetRecord( CTDRecord* recordIn, unsigned int iIndex );
	int AddRecord( CTDRecord* recordIn );
	int DeleteRecord( unsigned int iIndex );
	int GetRecordCount( unsigned int* lpiCount );
	int GetValidRecordCount( unsigned int* lpiCount );

////////////////////////////////////////////////////////////////////////
//	Private Interface
////////////////////////////////////////////////////////////////////////
private:
	FILE*		_lpFile;
	TDDBTable	_tableDef;
	long		_lFirstRecord;

	int				ResetEverything( void );
	long			GetRecordOffset( unsigned int iIndex );
	unsigned int	GetRecordSizeInBytes( void );
};