int DB::ireturn_multi_serch(char *sql, int r, int c)
{
    char *errMsg;
    char **dbResult;
    int nRow = 0, nColumn = 0;
    int rc;

    int result;
    rc = sqlite3_get_table(db,sql,&dbResult,&nRow,&nColumn,&errMsg);
    if(rc == SQLITE_OK && r<=nRow &&r>0 && c<=nColumn &&c>0)
    {
        result = atoi(dbResult[r*nColumn+c-1]);
        sqlite3_free_table(dbResult);
        return result;
    }
    else
    {
        cout<<"第"<<r<<"行,第"<<c<<"条数据无效"<<endl;
        return NULL;
    }
}

可参考：sqlite3_get_table() 是这样抓取数据的