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#include "pqConn.h"
#include <dbTypes.h>
#include <helpers.h>
#include <libpq-fe.h>
#include <memory>
#include <sstream>
#include <stdexcept>
#include <string>
#include <variant>
#include <vector>
namespace MyGrate::Output::Pq {
using ResPtr = std::unique_ptr<PGresult, decltype(&PQclear)>;
PqConn::PqConn(const char * const str) : conn {PQconnectdb(str)}
{
verify<std::runtime_error>(PQstatus(conn) == CONNECTION_OK, "Connection failure");
PQsetNoticeProcessor(conn, notice_processor, this);
}
PqConn::~PqConn()
{
PQfinish(conn);
}
void
PqConn::query(const char * const q)
{
ResPtr res {PQexec(conn, q), &PQclear};
verify<std::runtime_error>(PQresultStatus(res.get()) == PGRES_COMMAND_OK, q);
}
struct Bindings {
// NOLINTNEXTLINE(hicpp-explicit-conversions)
explicit Bindings(const std::initializer_list<DbValue> & vs)
{
bufs.reserve(vs.size());
values.reserve(vs.size());
lengths.reserve(vs.size());
for (const auto & v : vs) {
std::visit(*this, v);
}
}
template<Stringable T>
void
operator()(const T & v)
{
bufs.emplace_back(std::to_string(v));
const auto & vw {bufs.back()};
values.emplace_back(vw.data());
lengths.emplace_back(vw.length());
}
template<Viewable T>
void
operator()(const T & v)
{
values.emplace_back(v.data());
lengths.emplace_back(v.size());
}
template<typename T>
void
operator()(const T &)
{
throw std::runtime_error("Not implemented");
}
void
operator()(const std::nullptr_t &)
{
values.emplace_back(nullptr);
lengths.emplace_back(0);
}
std::vector<std::string> bufs;
std::vector<const char *> values;
std::vector<int> lengths;
};
void
PqConn::query(const char * const q, const std::initializer_list<DbValue> & vs)
{
Bindings b {vs};
ResPtr res {PQexecParams(conn, q, (int)vs.size(), nullptr, b.values.data(), b.lengths.data(), nullptr, 0),
&PQclear};
verify<std::runtime_error>(PQresultStatus(res.get()) == PGRES_COMMAND_OK, q);
}
void
PqConn::notice_processor(void * p, const char * n)
{
return static_cast<PqConn *>(p)->notice_processor(n);
}
void
PqConn::notice_processor(const char *) const
{
}
}
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