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//
// Copyright (c) 2022 Klemens Morgenstern (klemens.morgenstern@gmx.net)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef BOOST_SQLITE_JSON_HPP
#define BOOST_SQLITE_JSON_HPP
#include <boost/sqlite/detail/config.hpp>
#include <boost/sqlite/field.hpp>
#include <boost/sqlite/resultset.hpp>
#include <boost/sqlite/value.hpp>
#include <boost/json/parse.hpp>
#include <boost/json/serializer.hpp>
#include <boost/json/storage_ptr.hpp>
#include <boost/json/value_from.hpp>
BOOST_SQLITE_BEGIN_NAMESPACE
struct resultset;
struct field;
struct value;
/// @brief The subtype value used by the sqlite json extension. See the [sqlite reference](https://www.sqlite.org/json1.html)
constexpr int json_subtype = static_cast<int>('J');
inline void tag_invoke(const struct set_result_tag &, sqlite3_context * ctx, const json::value & value)
{
json::serializer ser;
ser.reset(&value);
sqlite3_int64 len = 4096;
unique_ptr<char> c{static_cast<char*>(sqlite3_malloc64(len))};
len = sqlite3_msize(c.get());
auto v = ser.read(c.get(), len);
while (!ser.done())
{
auto l = v.size();
len *= 2;
c.reset(static_cast<char*>(sqlite3_realloc(c.release(), len)));
v = ser.read(c.get() + l, len);
}
sqlite3_result_text(ctx, c.release(), v.size(), sqlite3_free);
sqlite3_result_subtype(ctx, json_subtype);
}
///@{
/// @brief Check if the value or field is a json. @ingroup reference
inline bool is_json(const value & v) { return v.type() == value_type::text && v.subtype() == json_subtype; }
inline bool is_json(const field & f) { return f.type() == value_type::text && f.get_value().subtype() == json_subtype; }
///@}
///@{
/// @brief Convert the value or field to a json. @ingroup reference
inline json::value as_json(const value & v, json::storage_ptr ptr = {})
{
return json::parse(v.get_text(), ptr);
}
inline json::value as_json(const field & f, json::storage_ptr ptr = {})
{
return json::parse(f.get_text(), ptr);
}
///@}
inline void tag_invoke( const json::value_from_tag &, json::value& val, const value & f)
{
switch (f.type())
{
case value_type::integer:
val.emplace_int64() = f.get_int();
break;
case value_type::floating:
val.emplace_double() = f.get_double();
break;
case value_type::text:
{
auto txt = f.get_text();
if (f.subtype() == json_subtype)
val = json::parse(txt, val.storage());
else
val.emplace_string() = txt;
}
break;
case value_type::blob:
throw_exception(std::invalid_argument("cannot convert blob to json"));
case value_type::null:
default:
val.emplace_null();
}
}
inline void tag_invoke( const json::value_from_tag &, json::value& val, const field & f)
{
switch (f.type())
{
case value_type::integer:
val.emplace_int64() = f.get_int();
break;
case value_type::floating:
val.emplace_double() = f.get_double();
break;
case value_type::text:
{
auto txt = f.get_text();
if (f.get_value().subtype() == json_subtype)
val = json::parse(txt, val.storage());
else
val.emplace_string() = txt;
}
break;
case value_type::blob:
throw_exception(std::invalid_argument("cannot convert blob to json"));
case value_type::null:
default:
val.emplace_null();
}
}
inline void tag_invoke( const json::value_from_tag &, json::value& val, resultset && rs)
{
auto & obj = val.emplace_array();
for (auto r : rs)
{
auto & row = obj.emplace_back(json::object(obj.storage())).get_object();
for (auto c : r)
row[c.column_name()] = json::value_from(c, row.storage());
}
}
BOOST_SQLITE_END_NAMESPACE
#endif //BOOST_SQLITE_JSON_HPP
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