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/*-------------------------------------------------------------------------
*
* FILE
* pqxx/tablereader.hxx
*
* DESCRIPTION
* 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) 2001-2011, Jeroen T. Vermeulen <jtv@xs4all.nl>
*
* 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"
#include "pqxx/tablestream"
namespace pqxx
{
/// @deprecated 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:
tablereader(transaction_base &,
const PGSTD::string &Name,
const PGSTD::string &Null=PGSTD::string());
template<typename ITER>
tablereader(transaction_base &,
const PGSTD::string &Name,
ITER begincolumns,
ITER endcolumns);
template<typename ITER> tablereader(transaction_base &,
const PGSTD::string &Name,
ITER begincolumns,
ITER endcolumns,
const PGSTD::string &Null);
~tablereader() throw ();
template<typename TUPLE> tablereader &operator>>(TUPLE &);
operator bool() const throw () { return !m_Done; }
bool operator!() const throw () { return m_Done; }
bool get_raw_line(PGSTD::string &Line);
template<typename TUPLE>
void tokenize(PGSTD::string, TUPLE &) const;
virtual void complete();
private:
void setup(transaction_base &T,
const PGSTD::string &RName,
const PGSTD::string &Columns=PGSTD::string());
void PQXX_PRIVATE reader_close();
PGSTD::string extract_field(const PGSTD::string &,
PGSTD::string::size_type &) const;
bool m_Done;
};
template<typename ITER> inline
tablereader::tablereader(transaction_base &T,
const PGSTD::string &Name,
ITER begincolumns,
ITER endcolumns) :
namedclass(Name, "tablereader"),
tablestream(T, PGSTD::string()),
m_Done(true)
{
setup(T, Name, columnlist(begincolumns, endcolumns));
}
template<typename ITER> inline
tablereader::tablereader(transaction_base &T,
const PGSTD::string &Name,
ITER begincolumns,
ITER endcolumns,
const PGSTD::string &Null) :
namedclass(Name, "tablereader"),
tablestream(T, Null),
m_Done(true)
{
setup(T, Name, columnlist(begincolumns, endcolumns));
}
template<typename TUPLE>
inline void tablereader::tokenize(PGSTD::string Line, TUPLE &T) const
{
PGSTD::back_insert_iterator<TUPLE> ins = PGSTD::back_inserter(T);
PGSTD::string::size_type here=0;
while (here < Line.size()) *ins++ = extract_field(Line, here);
}
template<typename TUPLE>
inline tablereader &pqxx::tablereader::operator>>(TUPLE &T)
{
PGSTD::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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