Re: [boost] [relational] Relational Model Library

From: Reece Dunn (msclrhd_at_[hidden])
Date: 2005-10-02 18:07:28

Larry Evans wrote:
> On 10/02/2005 04:53 PM, Reece Dunn wrote:
> [snip]
> 
>>The RML database and results could be kept in tuples, so CREATE TABLE 
>>would be:
>>
>>    typedef boost::tuple< std::string, std::string, int >
>>            people_table;
>>    static const int first_name = 0;
>>    ...
> 
> But, as Calum pointed out in:
> 
>    http://lists.boost.org/Archives/boost/2005/09/94348.php
> 
> I.e. the "first_name" column may be 2 for
> customers, and 3 for products.  Hence, this would
> have to be qualified with the table or record name, e.g.
> 
>    customers::first_name
>    products::first_name
> 
> and this would lead to the readability problem which
> Jonathan repeated in:
> 
>    http://lists.boost.org/Archives/boost/2005/10/94661.php

True. Here, macros would be needed for something like:

    BOOST_CREATE_TABLE( mytable,
       BOOST_TABLE_ROW( first_name, std::string )
       ...
    );

but this would no longer be a tuple :(. Unless you have something like:

    struct people
    {
       typedef tuple< ... > table;
       static const int first_name = 0;
    };

then the macro definition breaks :(.

- Reece