ds_table.h

内存数据库

#ifndef __DS_TABLE_H__
#define __DS_TABLE_H__

#include "ds_array.h"
#include "ds_list.h"

#define FT_I1		1
#define FT_UI1		FT_I1+1
#define FT_I2		FT_I1+2
#define FT_UI2		FT_I1+3
#define FT_I4		FT_I1+4
#define FT_UI4		FT_I1+5
#define FT_R4		FT_I1+6
#define FT_R8		FT_I1+7
#define FT_INT		FT_I1+8
#define FT_STR		FT_I1+9
#define FT_VOID		FT_I1+10
#define FT_CHAR		FT_I1
#define FT_BYTE		FT_UI1
#define FT_SHORT	FT_I2
#define FT_WORD		FT_UI2
#define FT_LONG		FT_I4
#define FT_DWORD	FT_UI4
#define FT_FLOAT	FT_R4
#define FT_DOUBLE	FT_R8

#define TABLE_NAME_MAXLEN			20
#define FIELD_NAME_MAXLEN			10


typedef enum
{

	OPER_ADD,
	OPER_DELETE,
	OPER_MODIFY,

}OPER_TYPE;


typedef struct
{
	OPER_TYPE	oper_type;
	LPOSITION	oper_record;
	INT			oper_field;
	
}OPER_EVENT;


typedef struct
{
	UINT		index;
	char		name[FIELD_NAME_MAXLEN+1];      
	BYTE		type;               
	long		size;
	
}TB_FIELD;


typedef struct{

	union {
		char                    cVal;                 // FT_I1.
		BYTE                    bVal;                 // FT_UI1.
		short                   iVal;                 // FT_I2.
		unsigned short          uiVal;                // FT_UI2.
		long                    lVal;                 // FT_I4.
		unsigned long           ulVal;                // FT_UI4.
		float                   fltVal;               // FT_R4.
		double                  dblVal;               // FT_R8.
		int						intVal;				  // FT_INT
		char*					pStrVal;			  // FT_STR
		void*					pVoidVal;			  // FT_VOID		
    };
	
}TB_VARIANT;

typedef long (*FILTERPROC)();

typedef struct{

	void*			view_handle;


	FILTERPROC		filter_proc;

}TB_VIEW;



typedef struct
{
	DWORD			table_id;			//judge whether the table exist.

	DWORD			attribute;		
	
	char			table_name[TABLE_NAME_MAXLEN+1];

	UINT			field_num;	
	UINT			record_num;

	DS_ARRAY		field_info;
	
	DS_LIST			record_list;

	LPOSITION		current_position;

	DS_LIST			self_views;


}DS_TABLE;


#define	HTABLE		DS_TABLE*
#define HVIEW		DS_VIEW*

HTABLE	DST_CreateTable( const char* table_name, UINT field_num );
BOOL	DST_DestroyTable( HTABLE hTable );
BOOL	DST_SetFieldInfo( HTABLE hTable, UINT field_index, TB_FIELD fieldinfo );
BOOL	DST_GetFieldInfo( HTABLE hTable, UINT field_index, TB_FIELD* fieldinfo );
BOOL	DST_AddRecord( HTABLE hTable );
BOOL	DST_DeleteCurRecord( HTABLE hTable );
BOOL	DST_DeleteRecord( HTABLE hTable, LPOSITION pos );
BOOL	DST_SetFieldValue( HTABLE hTable, UINT field_index, TB_VARIANT field_value );
BOOL	DST_GetFieldValue( HTABLE hTable, UINT field_index, TB_VARIANT* field_value );
void	DST_MoveNext( HTABLE hTable );
void	DST_MovePrev( HTABLE hTable );
void	DST_MoveFirst( HTABLE hTable );
void	DST_MoveLast( HTABLE hTable );
int		DST_GetRecordCount( HTABLE hTable );
BOOL	DST_IsTable( HTABLE hTable );
void	DST_SetAbsolutePostion( HTABLE hTable, LPOSITION pos );




#endif