c++ sqlite3 create table and insert example

sqlite3.cpp

#include <iostream>
// dowload sqlite-amalgamation
// include header and link with sqlite3.o after creating object file from sqlite3.c
#include "../sqlite3/sqlite3.h"

static int callback(void *NotUsed, int argc, char **argv, char **azColName) {
   return 0;
}

class Sqlite
{
    public:
        sqlite3* mydb;

    public:

        Sqlite(const char* dbname)
        {
            sqlite3_open(dbname, &mydb);
        }

        ~Sqlite()
        {
            sqlite3_close(mydb);
        }

        int execute(const char* sql,int (*callback)(void *, int, char **, char **), char* err = 0)
        {
            return sqlite3_exec(mydb, sql, callback, 0, &err);
        }
};


int main()
{
    Sqlite con("db/sql.db");

    const char* q = "CREATE TABLE COMPANY("  \
      "ID INT PRIMARY KEY     NOT NULL," \
      "NAME           TEXT    NOT NULL," \
      "AGE            INT     NOT NULL," \
      "ADDRESS        CHAR(50)," \
      "SALARY         REAL );";

    con.execute(q, callback);

    const char* q2 = "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) "  \
         "VALUES (1, 'Paul', 32, 'California', 20000.00 ); " \
         "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) "  \
         "VALUES (2, 'Allen', 25, 'Texas', 15000.00 ); "     \
         "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY)" \
         "VALUES (3, 'Teddy', 23, 'Norway', 20000.00 );" \
         "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY)" \
         "VALUES (4, 'Mark', 25, 'Rich-Mond ', 65000.00 );";
    
    con.execute(q2, callback);

    return 0;
}