g++ was not declared in this scope - c++

Question

I im writing sqlite3 wrapper with class to read db file. I im using ubuntu 64-bit and g++ compiler...and when i run code above i get this:
g++ ezserver.cpp -lsqlite3 -o ezserver
ezserver.cpp: In function int main():
ezserver.cpp:7:2: error: DataBase was not declared in this scope
DataBase = new EZServer();
^
database.h
#ifndef DATABASE_H
#define DATABASE_H
/* LIBRARY */
#include <sqlite3.h>
/* CLASS */
class EZServer {
public:
EZServer();
~EZServer();
int OpenDataBase(const char *TFileName);
int CreateDataBase(const char *TFileName);
private:
sqlite3 *DataBase;
sqlite3_stmt *QueryHandle[2];
};
#endif
database.cpp
#include "database.h"
/* CONSTRUCTOR */
EZServer::EZServer(): DataBase(0) {
QueryHandle[0] = NULL;
QueryHandle[1] = NULL;
}
/* DESTRUCTOR */
EZServer::~EZServer() {
/* CLOSE - database */
if (DataBase) {
sqlite3_close(DataBase);
}
}
/* LOAD - database file */
int EZServer::OpenDataBase(const char *TFileName) {
/* OPEN - database */
int Result = sqlite3_open_v2(TFileName, &DataBase, SQLITE_OPEN_READWRITE, NULL);
/* CHECK - database */
if (Result != SQLITE_OK) {
printf("OpenDataBase: %s\n", sqlite3_errmsg(DataBase));
sqlite3_close(DataBase);
return 0;
}
return 1;
}
/* CREATE - database file */
int EZServer::CreateDataBase(const char *TFileName) {
/* OPEN - database */
int Result = sqlite3_open_v2(TFileName, %DataBase, SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, NULL);
/* CHECK - database */
if (Result != SQLITE_OK) {
printf("OpenDataBaseCreate: %s\n", sqlite3_errmsg(DataBase));
sqlite3_close(DataBase);
return 0;
}
return 1;
}
ezserver.h
#ifndef EZSERVER_H
#define EZSERVER_H
/* FORWARD - declarations */
class EZServer;
/* CLASS */
class StatsClass {
public:
int Init();
private:
EZServer *DataBase;
};
#endif
ezserver.cpp
#include "ezserver.h"
#include "database.h"
int main() {
DataBase = new EZServer();
}
main file is ezserver.cpp.
i im beginner in c++ so i read posts here try solutions but always get DataBase was not declared in this scope...could some one give solution?
Thanks.
EDIT:
I need to call EZServer() class name that holds functions like OpenDataBase CreateDataBase.
// Load database that opens save and query
Database = new EZServer();
Database->OpenDatabase("ezserver.db");
so i need this above ->OpenDataBase to be called from EZServer.cpp (main file program) and return from class EZServer value that function is defined in database.cpp

Answer 1

I found another problem, you should compile all *.cpp files.
g++ ezserver.cpp database.cpp -lsqlite3 -o ezserver
here is log when i run this:
g++ ezserver.cpp database.cpp -lsqlite3 -o ezserver database.cpp:4:20:
error: definition of implicitly-declared ‘EZServer::EZServer()’
EZServer::EZServer(): DataBase(0) { ^ database.cpp:10:21: error:
definition of implicitly-declared ‘EZServer::~EZServer()’
EZServer::~EZServer() { ^ database.cpp: In member function ‘int
EZServer::OpenDataBase(const char*)’: database.cpp:20:76: error:
‘NULL’ was not declared in this scope int Result =
sqlite3_open_v2(TFileName, &DataBase, SQLITE_OPEN_READWRITE, NULL); ^
database.cpp:24:56: error: ‘printf’ was not declared in this scope
printf("OpenDataBase: %s\n", sqlite3_errmsg(DataBase)); ^
database.cpp: In member function ‘int EZServer::CreateDataBase(const
char*)’: database.cpp:34:42: error: expected primary-expression
before ‘%’ token int Result = sqlite3_open_v2(TFileName,
%DataBase, SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, NULL); ^
database.cpp:34:97: error: ‘NULL’ was not declared in this scope
int Result = sqlite3_open_v2(TFileName, %DataBase,
SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, NULL); ^
database.cpp:38:62: error: ‘printf’ was not declared in this scope
printf("OpenDataBaseCreate: %s\n", sqlite3_errmsg(DataBase)); ^

Answer 2

Maybe you should write something like this:
EZServer* dataBase = new EZServer();
dataBase->OpenDataBase("ezserver.db");