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#include <iostream>
#include <string>
using namespace std;
// ***
// Types are according to: https://dev.mysql.com/doc/refman/8.0/en/select.html
// ***
//
// Other documentation:
// https://docs.oracle.com/cd/B28359_01/server.111/b28286/statements_10002.htm#SQLRF01702
struct select_expr {};
struct table_references {};
struct where_condition {};
namespace dbo {
struct ALL {
static inline const char* field() {
return "*";
}
};
struct rp_Clienti {
static inline const char* table() {
return "rp_Clienti";
}
struct ID {
static inline const char* field() {
return "ID";
}
};
};
}
template <typename S, typename T, typename W>
class Select {};
template <>
class Select<select_expr, table_references, where_condition>
{
public:
template<typename S, typename T, typename W>
void bind() {
mExpr = S::field();
mRef = T::table();
mWhere = W::field();
}
std::string toString() {
return std::string(" SELECT ") + mExpr + " FROM " + mRef + " WHERE " + mWhere;
}
private:
std::string mExpr;
std::string mRef;
std::string mWhere;
};
int main() {
Select<select_expr, table_references, where_condition> query;
query.bind<dbo::ALL, dbo::rp_Clienti, dbo::rp_Clienti::ID>();
cout << query.toString();
return 0;
}
Cpp
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