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#ifndef MYGRATE_INPUT_MYSQLBINDINGS_H
#define MYGRATE_INPUT_MYSQLBINDINGS_H
#include <dbTypes.h>
#include <helpers.h>
#include <initializer_list>
#include <mysql.h>
#include <mysql_types.h>
#include <variant>
#include <vector>
namespace MyGrate::Input {
struct BingingData {
explicit BingingData(unsigned long l, my_bool n = 0) : len {l}, null {n} { }
unsigned long len;
my_bool null;
};
struct Bindings {
explicit Bindings(const std::span<const DbValue> vs)
{
binds.reserve(vs.size());
data.reserve(vs.size());
for (const auto & v : vs) {
v.visit(*this);
}
}
template<std::integral T>
void
operator()(const T & v)
{
auto & b = binds.emplace_back();
b.buffer_type = MySQL::CType<T>::type;
b.buffer = const_cast<T *>(&v);
b.is_unsigned = std::unsigned_integral<T>;
}
template<std::floating_point T>
void
operator()(const T & v)
{
auto & b = binds.emplace_back();
b.buffer_type = MySQL::CType<T>::type;
b.buffer = const_cast<T *>(&v);
}
template<Viewable T>
void
operator()(const T & v)
{
auto & b = binds.emplace_back();
b.buffer_type = MySQL::CType<T>::type;
b.buffer = const_cast<typename T::value_type *>(v.data());
b.length = &data.emplace_back(v.size(), 0).len;
}
void
operator()(const std::nullptr_t &)
{
auto & b = binds.emplace_back();
b.buffer = nullptr;
b.is_null = &data.emplace_back(0, 1).null;
}
template<typename T>
void
operator()(const T &)
{
throw std::logic_error("Not implemented");
}
std::vector<MYSQL_BIND> binds;
std::vector<BingingData> data;
};
class ResultData : public BingingData {
public:
ResultData() : BingingData {0} { }
virtual ~ResultData() = default;
[[nodiscard]] virtual DbValue getValue() const = 0;
};
template<typename T> class ResultDataT : public ResultData {
public:
ResultDataT(MYSQL_BIND & b, const MYSQL_FIELD & f)
{
b.buffer = &buf;
b.buffer_length = sizeof(T);
b.is_null = &this->null;
b.length = &this->len;
b.is_unsigned = std::is_unsigned_v<T>;
b.buffer_type = f.type;
}
[[nodiscard]] DbValue
getValue() const override
{
return buf;
}
private:
T buf {};
};
template<> class ResultDataT<std::string_view> : public ResultData {
public:
ResultDataT(MYSQL_BIND & b, const MYSQL_FIELD & f) : buf(f.length)
{
b.buffer_length = buf.size();
b.buffer = buf.data();
b.is_null = &this->null;
b.length = &this->len;
b.buffer_type = f.type;
}
[[nodiscard]] DbValue
getValue() const override
{
return std::string_view {buf.data(), this->len};
}
private:
std::vector<char> buf;
};
template<> class ResultDataT<Blob> : public ResultData {
public:
ResultDataT(MYSQL_BIND & b, const MYSQL_FIELD & f) : buf(f.length)
{
b.buffer_length = buf.size();
b.buffer = buf.data();
b.is_null = &this->null;
b.length = &this->len;
b.buffer_type = f.type;
}
[[nodiscard]] DbValue
getValue() const override
{
return Blob {buf.data(), this->len};
}
private:
std::vector<std::byte> buf;
};
template<typename Out> class ResultDataTime : public ResultData {
public:
ResultDataTime(MYSQL_BIND & b, const MYSQL_FIELD & f)
{
b.buffer_length = sizeof(MYSQL_TIME);
b.buffer = &buf;
b.is_null = &this->null;
b.length = &this->len;
b.buffer_type = f.type;
}
[[nodiscard]] DbValue
getValue() const override
{
return Out {*this};
}
private:
operator Date() const
{
return Date(buf.year, buf.month, buf.day);
}
operator Time() const
{
return Time(buf.hour, buf.minute, buf.second);
}
operator DateTime() const
{
return DateTime(*this, *this);
}
MYSQL_TIME buf;
};
}
#endif
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