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00019 #include <string>
00020
00021 #include "pqxx/result"
00022 #include "pqxx/tablestream"
00023
00024
00025
00026
00027 namespace pqxx
00028 {
00029
00031
00043 class PQXX_LIBEXPORT tablereader : public tablestream
00044 {
00045 public:
00046 tablereader(transaction_base &,
00047 const PGSTD::string &RName,
00048 const PGSTD::string &Null=PGSTD::string());
00049
00051
00053 template<typename ITER>
00054 tablereader(transaction_base &,
00055 const PGSTD::string &RName,
00056 ITER begincolumns,
00057 ITER endcolumns,
00058 const PGSTD::string &Null=PGSTD::string());
00059
00060 ~tablereader() throw ();
00061
00062 template<typename TUPLE> tablereader &operator>>(TUPLE &);
00063
00064 operator bool() const throw () { return !m_Done; }
00065 bool operator!() const throw () { return m_Done; }
00066
00068
00071 bool get_raw_line(PGSTD::string &Line);
00072
00073 template<typename TUPLE>
00074 void tokenize(PGSTD::string, TUPLE &) const;
00075
00077
00084 virtual void complete();
00085
00086 #ifdef PQXX_DEPRECATED_HEADERS
00087
00088 bool GetRawLine(PGSTD::string &L) { return get_raw_line(L); }
00090 template<typename TUPLE> void Tokenize(PGSTD::string L, TUPLE &T) const
00091 { tokenize(L, T); }
00092 #endif
00093
00094 private:
00095 void setup(transaction_base &T,
00096 const PGSTD::string &RName,
00097 const PGSTD::string &Columns=PGSTD::string());
00098 void reader_close();
00099 PGSTD::string extract_field(const PGSTD::string &,
00100 PGSTD::string::size_type &) const;
00101
00102 bool m_Done;
00103 };
00104
00105
00106
00107
00108
00109 template<typename ITER> inline
00110 tablereader::tablereader(transaction_base &T,
00111 const PGSTD::string &RName,
00112 ITER begincolumns,
00113 ITER endcolumns,
00114 const PGSTD::string &Null) :
00115 tablestream(T, RName, Null, "tablereader"),
00116 m_Done(true)
00117 {
00118 setup(T, RName, columnlist(begincolumns, endcolumns));
00119 }
00120
00121
00122 template<typename TUPLE>
00123 inline void tablereader::tokenize(PGSTD::string Line, TUPLE &T) const
00124 {
00125 PGSTD::back_insert_iterator<TUPLE> ins = PGSTD::back_inserter(T);
00126
00127
00128 PGSTD::string::size_type here=0;
00129 while (here < Line.size()) *ins++ = extract_field(Line, here);
00130 }
00131
00132
00133 template<typename TUPLE>
00134 inline tablereader &pqxx::tablereader::operator>>(TUPLE &T)
00135 {
00136 PGSTD::string Line;
00137 if (get_raw_line(Line)) tokenize(Line, T);
00138 return *this;
00139 }
00140
00141
00142 }
00143