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00001 /* 00002 * RetTypes.h 00003 * 00004 * Created on: Nov 22, 2011 00005 * Author: martin 00006 */ 00007 00008 #ifndef RETTYPES_H_ 00009 #define RETTYPES_H_ 00010 00011 #include <tuple> 00012 #include <libpqtypes.h> 00013 #include "PqTypeWrap.h" 00014 #include "PgSqlException.h" 00015 00016 namespace psql 00017 { 00018 00019 template<typename... Tail> 00020 class RetTypes 00021 {}; 00022 00023 template<typename Head, typename... Tail> 00024 class RetTypes<Head, Tail...> : private RetTypes<Tail...> 00025 { 00026 private: 00027 PqTypeWrap<Head> tw; 00028 protected: 00029 std::tuple<Head, Tail...> get_values_prot(PGresult* res, int row, int col) 00030 { 00031 return std::tuple_cat(std::make_tuple(tw.get(res, row, col)), RetTypes<Tail...>::get_values_prot(res, row, col + 1)); 00032 } 00033 public: 00034 typedef std::tuple<Head, Tail...> RowType; 00035 00036 RowType get_values(PGresult* res, int row) 00037 { 00038 return get_values_prot(res, row, 0); 00039 } 00040 }; 00041 00042 template<> 00043 class RetTypes<> 00044 { 00045 protected: 00046 std::tuple<> get_values_prot(PGresult* res, int, int col) 00047 { 00048 if (PQnfields(res) != col) 00049 throw PgSqlException("Statement not retrieving all data in result"); 00050 return std::tuple<>(); 00051 } 00052 public: 00053 typedef std::tuple<> RowType; 00054 00055 RowType get_values(PGresult*, int) 00056 { 00057 return std::tuple<>(); 00058 } 00059 }; 00060 00061 } /* namespace psql */ 00062 #endif /* RETTYPES_H_ */
