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/** Implementation of the pqxx::tablewriter class.
*
* pqxx::tablewriter enables optimized batch updates to a database table.
*
* 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.
*/
#include "pqxx/compiler-internal.hxx"
#include "pqxx/tablereader"
#include "pqxx/tablewriter"
#include "pqxx/transaction"
#include "pqxx/internal/gates/transaction-tablewriter.hxx"
using namespace pqxx::internal;
pqxx::tablewriter::tablewriter(
transaction_base &T,
const std::string &WName,
const std::string &Null) :
namedclass{"tablewriter", WName},
tablestream(T, Null)
{
set_up(T, WName);
}
pqxx::tablewriter::~tablewriter() noexcept
{
try
{
writer_close();
}
catch (const std::exception &e)
{
reg_pending_error(e.what());
}
}
void pqxx::tablewriter::set_up(
transaction_base &T,
const std::string &WName,
const std::string &Columns)
{
gate::transaction_tablewriter{T}.BeginCopyWrite(WName, Columns);
register_me();
}
pqxx::tablewriter &pqxx::tablewriter::operator<<(pqxx::tablereader &R)
{
std::string Line;
// TODO: Can we do this in binary mode? (Might require protocol version check)
while (R.get_raw_line(Line)) write_raw_line(Line);
return *this;
}
void pqxx::tablewriter::write_raw_line(const std::string &Line)
{
const std::string::size_type len = Line.size();
gate::transaction_tablewriter{m_trans}.write_copy_line(
((len == 0) or (Line[len-1] != '\n')) ?
Line :
std::string{Line, 0, len-1});
}
void pqxx::tablewriter::complete()
{
writer_close();
}
void pqxx::tablewriter::writer_close()
{
if (not is_finished())
{
base_close();
try
{
gate::transaction_tablewriter{m_trans}.end_copy_write();
}
catch (const std::exception &)
{
try { base_close(); } catch (const std::exception &) {}
throw;
}
}
}
namespace
{
inline char escapechar(char i) noexcept
{
char r = '\0';
switch (i)
{
case 8: r='b'; break; // backspace
case 11: r='v'; break; // vertical tab
case 12: r='f'; break; // form feed
case '\n': r='n'; break; // newline
case '\t': r='t'; break; // tab
case '\r': r='r'; break; // carriage return
case '\\': r='\\'; break; // backslash
}
return r;
}
inline bool unprintable(char i) noexcept
{
return i < ' ' or i > '~';
}
inline char tooctdigit(char c, int n)
{
using unsigned_char = unsigned char;
unsigned int i = unsigned_char(c);
return number_to_digit((i>>(3*n)) & 0x07);
}
} // namespace
std::string pqxx::internal::escape(
const std::string &s,
const std::string &null)
{
if (s == null) return "\\N";
if (s.empty()) return s;
std::string R;
R.reserve(s.size()+1);
for (const auto c: s)
{
const char e = escapechar(c);
if (e)
{
R += '\\';
R += e;
}
else if (unprintable(c))
{
R += "\\";
for (int n=2; n>=0; --n) R += tooctdigit(c, n);
}
else
{
R += c;
}
}
return R;
}
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