Re: Simple solution to database

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Simple solution to database

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Join Date: Sep 2004

Posts: 6,067

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Expert Meanie

Re: Simple solution to database

#7

Jun 13th, 2007

>What to return?
An exception is the better option in this case. But if you want to return something, you need to pick a string that couldn't possibly be in the database. That's difficult to do, so you might do well to add a level of indirection by using an object for each cell rather than a string. Then you can easily give it a null value and any other cellish information that isn't easily derived from the value:

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class Cell {
  bool is_null;
  std::string value;
public:
  Cell ( const std::string& init = "" )
    : is_null ( init.size() == 0 ), value ( init )
  {}
public:
  const std::string& GetValue() const
  {
    return value;
  }

  void SetValue ( const std::string& s )
  {
    value = s;
    is_null = false;
  }

  bool IsNull() const
  {
    return is_null;
  }
};

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