example_read.c

来自「pft实现源码」· C语言 代码 · 共 37 行

/* (C)opyleft 2001-2004 Frank DENIS <[e-mail]> */

#include <config.h>

#include "puredb_p.h"
#include "puredb_read.h"

int main(void)
{
    char *data; 
    PureDB db;
    off_t retpos;
    size_t retlen;
    int err;    
    
    if (puredb_open(&db, "puredb.pdb") != 0) {
        perror("Can't open the database");
        goto end;
    }
    if ((err = puredb_find_s(&db, "key42", &retpos, &retlen)) != 0) {
        fprintf(stderr, "The key wasn't found [err=%d]\n", err);        
        goto end;
    }
    if ((data = puredb_read(&db, retpos, retlen)) != NULL) {
        printf("The maching data is : [%s]\n", data);
        puredb_read_free(data);
    }
    end:
    if (puredb_close(&db) != 0) {
        perror("The database couldn't be properly closed");
    }
    
    return 0;
}