memdatabase.h

来自「Unix 环境下用C语言实现的内存数据库。」· C头文件 代码 · 共 50 行

#ifndef MEMDATABASE_H
#define MEMDATABASE_H

#include <stdio.h>
#include <sys/sem.h>
#include <sys/shm.h>
#include "ErrCode.h"

#define FPOS( type, field ) ( (int)&(( type *) 0)-> field )
#define FLEN( type, field ) ( sizeof((( type *) 0)-> field ))
#define SetKeyMemDB(p,type,field) ( SetTableKey(p,FPOS(type,field),FLEN(type,field)) )
#define DeclareCursorMemDB(p,type,field,value) ( DeclareTableKey(p,FPOS(type,field),FLEN(type,field),(void*)value) )

#define MAX_FETCHKEY_NUM      10
#define MAX_FETCHVALUE_LEN    256

typedef struct
{
    int iKeyOffSet;       /* The Key field offset */
    int iKeyLen;          /* The Key field len */
    char sValue[MAX_FETCHVALUE_LEN];  /* The Value of Fetch Key */
}FETCH_KEY_DEF;

typedef struct
{
    int iIpcKey;       /* The key of ShareMemory and Semphore */
    int iShmId;        /* The Id of ShareMemory */
    int iSemId;        /* The Id of Semphore */
    long lFetchNum;    /* The Index of Fetch */
    int iFetchKeyNum;  /* The Fetch Key Number */
    FETCH_KEY_DEF stuFetchKeyBuf[MAX_FETCHKEY_NUM];   /* The Declare Fetch Key Define */
    char *pShmArea;    /* The Point to ShareMemory */
}MEMDATABASE;


int CreateMemDB(MEMDATABASE **pMemDB,char *pTableName,int iIpcKey,long lMaxRecord,int RecordLen);
int DropMemDB(MEMDATABASE *pMemDB);
int AttachMemDB(MEMDATABASE **pMemDB,int iIpcKey);
int FetchCursorMemDB(MEMDATABASE *pMemDB,char *pInBuffer);
int CloseCursorMemDB(MEMDATABASE *pMemDB);
int SelectOneMemDB(MEMDATABASE *pMemDB,char *pInBuffer);
int SelectMemDB(MEMDATABASE *pMemDB,char *pInBuffer);
int UpdateMemDB(MEMDATABASE *pMemDB,char *pInBuffer);
int DeleteMemDB(MEMDATABASE *pMemDB,char *pInBuffer);
int DeleteOneMemDB(MEMDATABASE *pMemDB,char *pInBuffer);
int InsertMemDB(MEMDATABASE *pMemDB,char *pInBuffer);
void TruncateMemDB(MEMDATABASE *pMemDB);

#endif