Версия для печати темы

int main( ) {
    DataWork db;
    try {
    } catch ( DataWork::Error e ) {
        std::cout << "catch error: " << e.errorStr << std::endl;
        return -1;
    }
    std::cout << "end of program" << std::endl;
    return 0;
}

const std::string CREATE_USERS_TABLE = "Create table users( id integer primary key autoincrement, login varchar(20), serverName varchar(20), password varchar(20) );";
DataWork::DataWork( ) {
    if ( sqlite3_open( DBNAME.c_str( ), &m_db ) != SQLITE_OK ) {
    char *errorMsg = ( char * ) sqlite3_errmsg( m_db );
        throw Error( errorMsg );
    }
    executeSQL( CREATE_USERS_TABLE );
}
DataWork::~DataWork( ) {
    sqlite3_close( m_db );
}
void DataWork::executeSQL( const std::string &sql, int ( *callback )( void *, int, char **, char ** ) ) {
    char *errorMsg;
    if ( sqlite3_exec( m_db, sql.c_str( ), callback, NULL, &errorMsg ) != SQLITE_OK ) {
        throw Error( errorMsg );
    }
}

class DataWork {
public:
    // структура ошибки
    struct Error {
        const char *errorStr;
        Error( const char *str ) : errorStr( str ) { }
    };
    DataWork( );
    ~DataWork( );
private:
    void executeSQL( const std::string &sql,
        int ( *callback )( void *, int, char **, char ** ) = NULL );
    
private:
    sqlite3 *m_db;
};