18 #if defined(PQXX_HAVE_PATH) 19 # include <filesystem> 22 #if defined(PQXX_HAVE_RANGES) && __has_include(<ranges>) 26 #if defined(PQXX_HAVE_SPAN) && __has_include(<span>) 30 #include "pqxx/dbtransaction.hxx" 80 blob &operator=(
blob const &) =
delete;
91 static constexpr std::size_t chunk_limit = 0x7fffffff;
102 std::size_t read(std::basic_string<std::byte> &buf, std::size_t size);
104 #if defined(PQXX_HAVE_SPAN) 111 template<std::
size_t extent = std::dynamic_extent>
112 std::span<std::byte> read(std::span<std::byte, extent> buf)
114 return buf.subspan(0, raw_read(std::data(buf), std::size(buf)));
116 #endif // PQXX_HAVE_SPAN 118 #if defined(PQXX_HAVE_CONCEPTS) && defined(PQXX_HAVE_SPAN) 125 template<binary DATA> std::span<std::byte> read(DATA &buf)
127 return {std::data(buf), raw_read(std::data(buf), std::size(buf))};
129 #else // PQXX_HAVE_CONCEPTS && PQXX_HAVE_SPAN 143 template<
typename ALLOC>
144 std::basic_string_view<std::byte>
read(std::vector<std::byte, ALLOC> &buf)
146 return {std::data(buf), raw_read(std::data(buf), std::size(buf))};
148 #endif // PQXX_HAVE_CONCEPTS && PQXX_HAVE_SPAN 150 #if defined(PQXX_HAVE_CONCEPTS) 170 template<binary DATA>
void write(DATA
const &data)
172 raw_write(std::data(data), std::size(data));
194 template<
typename DATA>
void write(DATA
const &data)
196 raw_write(std::data(data), std::size(data));
207 void resize(std::int64_t size);
210 [[nodiscard]] std::int64_t tell()
const;
214 std::int64_t seek_abs(std::int64_t offset = 0);
220 std::int64_t seek_rel(std::int64_t offset = 0);
226 std::int64_t seek_end(std::int64_t offset = 0);
233 dbtransaction &tx, std::basic_string_view<std::byte> data, oid
id = 0);
238 static void append_from_buf(
239 dbtransaction &tx, std::basic_string_view<std::byte> data, oid
id);
242 [[nodiscard]]
static oid from_file(
dbtransaction &,
char const path[]);
244 #if defined(PQXX_HAVE_PATH) && !defined(_WIN32) 249 [[nodiscard]]
static oid
250 from_file(
dbtransaction &tx, std::filesystem::path
const &path)
252 return from_file(tx, path.c_str());
260 static oid from_file(dbtransaction &,
char const path[], oid);
262 #if defined(PQXX_HAVE_PATH) && !defined(_WIN32) 271 from_file(dbtransaction &tx, std::filesystem::path
const &path, oid
id)
273 return from_file(tx, path.c_str(), id);
282 dbtransaction &, oid, std::basic_string<std::byte> &,
283 std::size_t max_size);
292 static std::size_t append_to_buf(
293 dbtransaction &tx, oid
id, std::int64_t offset,
294 std::basic_string<std::byte> &buf, std::size_t append_max);
297 static void to_file(dbtransaction &, oid,
char const path[]);
299 #if defined(PQXX_HAVE_PATH) && !defined(_WIN32) 305 to_file(dbtransaction &tx, oid
id, std::filesystem::path
const &path)
307 to_file(tx,
id, path.c_str());
326 PQXX_PRIVATE blob(connection &conn,
int fd) noexcept :
327 m_conn{&conn}, m_fd{fd}
329 static PQXX_PRIVATE blob open_internal(dbtransaction &, oid,
int);
330 static PQXX_PRIVATE pqxx::internal::pq::PGconn *
332 static PQXX_PRIVATE pqxx::internal::pq::PGconn *
334 static PQXX_PRIVATE std::string errmsg(connection
const *);
335 static PQXX_PRIVATE std::string errmsg(dbtransaction
const &tx)
337 return errmsg(&tx.conn());
339 PQXX_PRIVATE std::string errmsg()
const {
return errmsg(m_conn); }
340 PQXX_PRIVATE std::int64_t seek(std::int64_t offset,
int whence);
341 std::size_t raw_read(std::byte buf[], std::size_t size);
342 void raw_write(std::byte
const buf[], std::size_t size);
344 connection *m_conn =
nullptr;
std::vector< std::string_view > to_buf(char *here, char const *end, TYPE... value)
Convert multiple values to strings inside a single buffer.
Definition: strconv.hxx:343
Abstract transaction base class: bracket transactions on the database.
Definition: dbtransaction.hxx:49
The home of all libpqxx classes, functions, templates, etc.
Definition: array.hxx:22
void write(DATA const &data)
Write data large object, at the current position.
Definition: blob.hxx:194
std::basic_string_view< std::byte > read(std::vector< std::byte, ALLOC > &buf)
Read up to std::size(buf) bytes from the object.
Definition: blob.hxx:144
Connection to a database.
Definition: connection.hxx:180