Design and Architecture

Pete O'Hanlon wrote:

We internally have a DI engine that is only 60 lines or so of code

VuNic wrote:

The Boosters.GetBooster() can be applied for both the scenarios?

+----+--------+-------+
| id | name   | price |
+----+--------+-------+
|  1 | wheel  | $1.23 |
+----+--------+-------+
|  2 | wire   | $1.50 |
+----+--------+-------+

wheels table

+----+--------+--------+
| id | cog_id | radius |
+----+--------+--------+
|  1 |    1   |   50"  |
+----+--------+--------+

wires table

+----+--------+--------+
| id | cog_id | length |
+----+--------+--------+
|  1 |    2   |   12"  |
+----+--------+--------+

Leslie Sanford wrote:

I'm not sure if this is a common approach.

Leslie Sanford wrote:

I know the joins will cost more processing, but at least the schema makes sense to me.

Bastard Programmer from Hell

Leslie Sanford wrote:

(they have sufficiently different characteristics

wan.rui@qq.com wrote:

so which way will the best way we should order ?

class CVehicle
{
public:
  virtual void Move();
}

class CCar: public CVehicle
{
public:
  void Move()
  {
    cout << "I am a car. I can be driven" << endl;
  }
}
class CBike: public CVehicle
{
public:
  void Move()
  {
    cout << "I am a bike. I can be ridden" << endl;
  }
}

class CAeroplane: public CVehicle
{
public:
  void Move()
  {
    cout << "I am an aeroplane. I can be flown" << endl;
  }
}