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00019 #include <stdexcept>
00020
00021 #include "pqxx/util"
00022
00023
00024
00025
00026
00027
00028
00029
00030
00031 namespace pqxx
00032 {
00033
00035
00042 class PQXX_LIBEXPORT result
00043 {
00044 public:
00045 result() : m_Result(0), m_Refcount(0) {}
00046 result(const result &rhs) :
00047 m_Result(0), m_Refcount(0) { MakeRef(rhs); }
00048 ~result() { LoseRef(); }
00049
00050 result &operator=(const result &);
00051
00052 typedef result_size_type size_type;
00053 class field;
00054
00055
00056
00058
00066 class PQXX_LIBEXPORT tuple
00067 {
00068 public:
00069 typedef tuple_size_type size_type;
00070 tuple(const result *r, result::size_type i) throw() :
00071 m_Home(r), m_Index(i) {}
00072 ~tuple() {}
00073
00074 inline field operator[](size_type) const throw ();
00075 field operator[](const char[]) const;
00076 field operator[](const PGSTD::string &s) const
00077 { return operator[](s.c_str()); }
00078 field at(size_type) const throw (PGSTD::out_of_range);
00079 field at(const char[]) const;
00080 field at(const PGSTD::string &s) const { return at(s.c_str()); }
00081
00082 inline size_type size() const;
00083
00084 result::size_type rownumber() const { return m_Index; }
00085
00087 size_type column_number(const PGSTD::string &ColName) const
00088 { return m_Home->column_number(ColName); }
00089
00091 size_type column_number(const char ColName[]) const
00092 { return m_Home->column_number(ColName); }
00093
00095 oid column_type(size_type ColNum) const
00096 { return m_Home->column_type(ColNum); }
00097
00099 oid column_type(const PGSTD::string &ColName) const
00100 { return column_type(column_number(ColName)); }
00101
00103 oid column_type(const char ColName[]) const
00104 { return column_type(column_number(ColName)); }
00105
00106 #ifdef PQXX_HAVE_PQFTABLE
00107 oid column_table(size_type ColNum) const
00108 { return m_Home->column_table(ColNum); }
00109 oid column_table(const PGSTD::string &ColName) const
00110 { return column_table(column_number(ColName)); }
00111 #endif
00112
00113
00114 #ifdef PQXX_DEPRECATED_HEADERS
00115
00116 result::size_type Row() const { return rownumber(); }
00117
00119 size_type ColumnNumber(const PGSTD::string &ColName) const
00120 { return m_Home->ColumnNumber(ColName); }
00121
00123 size_type ColumnNumber(const char ColName[]) const
00124 { return m_Home->ColumnNumber(ColName); }
00125 #endif
00126
00127
00128 protected:
00129 const result *m_Home;
00130 result::size_type m_Index;
00131
00132
00133 tuple();
00134 };
00135
00137
00140 class PQXX_LIBEXPORT field : private tuple
00141 {
00142 public:
00143 typedef size_t size_type;
00144
00146
00150 field(const tuple &R, tuple::size_type C) throw () :
00151 tuple(R), m_Col(C) {}
00152
00154
00159 const char *c_str() const {return m_Home->GetValue(m_Index,m_Col);}
00160
00162 inline const char *name() const;
00163
00165 oid type() const
00166 { return m_Home->column_type(m_Col); }
00167
00168 #ifdef PQXX_HAVE_PQFTABLE
00169
00170
00172 oid table() const { return m_Home->column_table(m_Col); }
00173 #endif
00174
00176
00185 template<typename T> bool to(T &Obj) const
00186 {
00187 if (is_null())
00188 return false;
00189
00190 try
00191 {
00192 FromString(c_str(), Obj);
00193 }
00194 catch (const PGSTD::exception &e)
00195 {
00196 throw PGSTD::domain_error("Error reading field " +
00197 PGSTD::string(name()) +
00198 ": " +
00199 e.what());
00200 }
00201 return true;
00202 }
00203
00204
00205 #ifdef PQXX_NO_PARTIAL_CLASS_TEMPLATE_SPECIALISATION
00206
00207 template<> bool to<PGSTD::string>(PGSTD::string &Obj) const;
00208
00210
00213 template<> bool to<const char *>(const char *&Obj) const;
00214 #endif
00215
00216
00218 template<typename T> bool to(T &Obj, const T &Default) const
00219 {
00220 const bool NotNull = to(Obj);
00221 if (!NotNull)
00222 Obj = Default;
00223 return NotNull;
00224 }
00225
00227
00230 template<typename T> T as(const T &Default) const
00231 {
00232 T Obj;
00233 to(Obj, Default);
00234 return Obj;
00235 }
00236
00238 template<typename T> T as() const
00239 {
00240 T Obj;
00241 const bool NotNull = to(Obj);
00242 if (!NotNull) throw PGSTD::domain_error("Attempt to read null field");
00243 return Obj;
00244 }
00245
00246 bool is_null() const { return m_Home->GetIsNull(m_Index,m_Col); }
00247
00248 size_type size() const { return m_Home->GetLength(m_Index,m_Col); }
00249
00250 #ifdef PQXX_DEPRECATED_HEADERS
00251
00252 const char *Name() const {return name();}
00253 #endif
00254
00255 private:
00256 tuple::size_type m_Col;
00257 };
00258
00260
00264 class PQXX_LIBEXPORT const_iterator :
00265 public PGSTD::iterator<PGSTD::random_access_iterator_tag,
00266 const tuple,
00267 result::size_type>,
00268 public tuple
00269 {
00270 public:
00271 const_iterator() : tuple(0,0) {}
00272
00279 pointer operator->() const { return this; }
00280 reference operator*() const { return *operator->(); }
00281
00282 const_iterator operator++(int);
00283 const_iterator &operator++() { ++m_Index; return *this; }
00284 const_iterator operator--(int);
00285 const_iterator &operator--() { --m_Index; return *this; }
00286
00287 const_iterator &operator+=(difference_type i)
00288 { m_Index+=i; return *this; }
00289 const_iterator &operator-=(difference_type i)
00290 { m_Index-=i; return *this; }
00291
00292 bool operator==(const const_iterator &i) const
00293 {return m_Index==i.m_Index;}
00294 bool operator!=(const const_iterator &i) const
00295 {return m_Index!=i.m_Index;}
00296 bool operator<(const const_iterator &i) const
00297 {return m_Index<i.m_Index;}
00298 bool operator<=(const const_iterator &i) const
00299 {return m_Index<=i.m_Index;}
00300 bool operator>(const const_iterator &i) const
00301 {return m_Index>i.m_Index;}
00302 bool operator>=(const const_iterator &i) const
00303 {return m_Index>=i.m_Index;}
00304
00305 inline const_iterator operator+(difference_type o) const;
00306
00307 friend const_iterator operator+(difference_type o,
00308 const_iterator i);
00309
00310 inline const_iterator operator-(difference_type o) const;
00311
00312 inline difference_type operator-(const_iterator i) const;
00313
00314 result::size_type num() const { return rownumber(); }
00315
00316 private:
00317 friend class result;
00318 const_iterator(const result *r, result::size_type i) : tuple(r, i) {}
00319 };
00320
00321 const_iterator begin() const { return const_iterator(this, 0); }
00322 inline const_iterator end() const;
00323
00324
00325 size_type size() const { return m_Result ? PQntuples(m_Result) : 0; }
00326 bool empty() const { return !m_Result || !PQntuples(m_Result); }
00327 size_type capacity() const { return size(); }
00328
00329 const tuple operator[](size_type i) const throw ()
00330 { return tuple(this, i); }
00331 const tuple at(size_type) const throw (PGSTD::out_of_range);
00332
00333 void clear() { LoseRef(); }
00334
00336 tuple::size_type columns() const { return PQnfields(m_Result); }
00337
00339 tuple::size_type column_number(const char ColName[]) const;
00340
00342 tuple::size_type column_number(const PGSTD::string &Name) const
00343 {return column_number(Name.c_str());}
00344
00346 const char *column_name(tuple::size_type Number) const;
00347
00349 inline oid column_type(tuple::size_type ColNum) const;
00350
00352 oid column_type(const PGSTD::string &ColName) const
00353 { return column_type(column_number(ColName)); }
00354
00356 oid column_type(const char ColName[]) const
00357 { return column_type(column_number(ColName)); }
00358
00359 #ifdef PQXX_HAVE_PQFTABLE
00360
00361 oid column_table(tuple::size_type ColNum) const;
00362
00364 oid column_table(const PGSTD::string &ColName) const
00365 { return column_table(column_number(ColName)); }
00366 #endif
00367
00368
00370
00372 oid inserted_oid() const { return PQoidValue(m_Result); }
00373
00374
00376
00377 size_type affected_rows() const;
00378
00379
00380 #ifdef PQXX_DEPRECATED_HEADERS
00381
00382 typedef tuple Tuple;
00384 typedef field Field;
00386 oid InsertedOid() const { return inserted_oid(); }
00388 size_type AffectedRows() const { return affected_rows(); }
00390 tuple::size_type Columns() const { return columns(); }
00392 tuple::size_type ColumnNumber(const char Name[]) const
00393 {return PQfnumber(m_Result,Name);}
00395 tuple::size_type ColumnNumber(const PGSTD::string &Name) const
00396 {return ColumnNumber(Name.c_str());}
00398 const char *ColumnName(tuple::size_type Number) const
00399 {return PQfname(m_Result,Number);}
00400 #endif
00401
00402
00403 private:
00404 PGresult *m_Result;
00405 mutable int *m_Refcount;
00406
00407 friend class result::field;
00408 const char *GetValue(size_type Row, tuple::size_type Col) const;
00409 bool GetIsNull(size_type Row, tuple::size_type Col) const;
00410 field::size_type GetLength(size_type Row, tuple::size_type Col) const;
00411
00412 friend class connection_base;
00413 explicit result(PGresult *rhs) : m_Result(rhs), m_Refcount(0) {MakeRef(rhs);}
00414 result &operator=(PGresult *);
00415 bool operator!() const throw () { return !m_Result; }
00416 operator bool() const throw () { return m_Result != 0; }
00417 void CheckStatus(const PGSTD::string &Query) const;
00418
00419 friend class Cursor;
00420 const char *CmdStatus() const throw () { return PQcmdStatus(m_Result); }
00421
00422
00423 void MakeRef(PGresult *);
00424 void MakeRef(const result &);
00425 void LoseRef() throw ();
00426 };
00427
00428
00430
00447 template<typename STREAM>
00448 inline STREAM &operator<<(STREAM &S, const pqxx::result::field &F)
00449 {
00450 S << F.c_str();
00451 return S;
00452 }
00453
00454
00455
00456 inline result::field
00457 result::tuple::operator[](result::tuple::size_type i) const throw ()
00458 {
00459 return field(*this, i);
00460 }
00461
00462 inline result::tuple::size_type result::tuple::size() const
00463 {
00464 return m_Home->columns();
00465 }
00466
00467 inline const char *result::field::name() const
00468 {
00469 return m_Home->column_name(m_Col);
00470 }
00471
00473 template<>
00474 inline bool result::field::to<PGSTD::string>(PGSTD::string &Obj) const
00475 {
00476 if (is_null()) return false;
00477 Obj = c_str();
00478 return true;
00479 }
00480
00482
00485 template<>
00486 inline bool result::field::to<const char *>(const char *&Obj) const
00487 {
00488 if (is_null()) return false;
00489 Obj = c_str();
00490 return true;
00491 }
00492
00493
00494 inline result::const_iterator
00495 result::const_iterator::operator+(difference_type o) const
00496 {
00497 return const_iterator(m_Home, m_Index + o);
00498 }
00499
00500 inline result::const_iterator
00501 operator+(result::const_iterator::difference_type o,
00502 result::const_iterator i)
00503 {
00504 return i + o;
00505 }
00506
00507 inline result::const_iterator
00508 result::const_iterator::operator-(difference_type o) const
00509 {
00510 return const_iterator(m_Home, m_Index - o);
00511 }
00512
00513 inline result::const_iterator::difference_type
00514 result::const_iterator::operator-(const_iterator i) const
00515 {
00516 return num()-i.num();
00517 }
00518
00519 inline result::const_iterator result::end() const
00520 {
00521 return const_iterator(this, size());
00522 }
00523
00524 inline oid result::column_type(tuple::size_type ColNum) const
00525 {
00526 const oid T = PQftype(m_Result, ColNum);
00527 if (T == oid_none)
00528 throw PGSTD::invalid_argument(
00529 "Attempt to retrieve type of nonexistant column " +
00530 ToString(ColNum) + " "
00531 "of query result");
00532 return T;
00533 }
00534
00535
00536 #ifdef PQXX_HAVE_PQFTABLE
00537 inline oid result::column_table(tuple::size_type ColNum) const
00538 {
00539 const oid T = PQftable(m_Result, ColNum);
00540
00541
00542
00543
00544
00545 if ((T == InvalidOid) &&
00546 ((ColNum < 0) || (ColNum >= columns())))
00547 throw PGSTD::invalid_argument("Attempt to retrieve table ID for column " +
00548 ToString(ColNum) + " "
00549 "out of " + ToString(columns()));
00550 return T;
00551 }
00552 #endif
00553
00554 }
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