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/** Definition of the pqxx::tablereader class.
*
* pqxx::tablereader enables optimized batch reads from a database table.
*
* DO NOT INCLUDE THIS FILE DIRECTLY; include pqxx/tablereader instead.
*
* Copyright (c) 2000-2019, Jeroen T. Vermeulen.
*
* See COPYING for copyright license. If you did not receive a file called
* COPYING with this source code, please notify the distributor of this mistake,
* or contact the author.
*/
#ifndef PQXX_H_TABLEREADER
#define PQXX_H_TABLEREADER
#include "pqxx/compiler-public.hxx"
#include "pqxx/compiler-internal-pre.hxx"
#include "pqxx/result.hxx"
#include "pqxx/tablestream.hxx"
namespace pqxx
{
/// @deprecated Use stream_from instead.
/** Efficiently pull data directly out of a table.
* @warning This class does not work reliably with multibyte encodings. Using
* it with some multi-byte encodings may pose a security risk.
*/
class PQXX_LIBEXPORT tablereader : public tablestream
{
public:
PQXX_DEPRECATED tablereader(
transaction_base &,
const std::string &Name,
const std::string &Null=std::string{});
template<typename ITER>
PQXX_DEPRECATED tablereader(
transaction_base &,
const std::string &Name,
ITER begincolumns,
ITER endcolumns);
template<typename ITER>
PQXX_DEPRECATED tablereader(
transaction_base &,
const std::string &Name,
ITER begincolumns,
ITER endcolumns,
const std::string &Null);
~tablereader() noexcept;
template<typename TUPLE> tablereader &operator>>(TUPLE &);
operator bool() const noexcept { return not m_done; }
bool operator!() const noexcept { return m_done; }
bool get_raw_line(std::string &Line);
template<typename TUPLE>
void tokenize(std::string, TUPLE &) const;
virtual void complete() override;
private:
void set_up(
transaction_base &T,
const std::string &RName,
const std::string &Columns=std::string{});
PQXX_PRIVATE void reader_close();
std::string extract_field(
const std::string &,
std::string::size_type &) const;
bool m_done;
};
template<typename ITER> inline
tablereader::tablereader(
transaction_base &T,
const std::string &Name,
ITER begincolumns,
ITER endcolumns) :
namedclass{Name, "tablereader"},
tablestream{T, std::string{}},
m_done{true}
{
set_up(T, Name, columnlist(begincolumns, endcolumns));
}
template<typename ITER> inline
tablereader::tablereader(
transaction_base &T,
const std::string &Name,
ITER begincolumns,
ITER endcolumns,
const std::string &Null) :
namedclass{Name, "tablereader"},
tablestream{T, Null},
m_done{true}
{
set_up(T, Name, columnlist(begincolumns, endcolumns));
}
template<typename TUPLE>
inline void tablereader::tokenize(std::string Line, TUPLE &T) const
{
std::back_insert_iterator<TUPLE> ins = std::back_inserter(T);
std::string::size_type here = 0;
while (here < Line.size()) *ins++ = extract_field(Line, here);
}
template<typename TUPLE>
inline tablereader &pqxx::tablereader::operator>>(TUPLE &T)
{
std::string Line;
if (get_raw_line(Line)) tokenize(Line, T);
return *this;
}
} // namespace pqxx
#include "pqxx/compiler-internal-post.hxx"
#endif
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