libpqxx
The C++ client library for PostgreSQL
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pqxx::largeobject_streambuf< CHAR, TRAITS > Class Template Reference

Accessor for large object's contents. More...

+ Inheritance diagram for pqxx::largeobject_streambuf< CHAR, TRAITS >:

Public Types

using char_type = CHAR
 
using traits_type = TRAITS
 
using int_type = typename traits_type::int_type
 
using pos_type = typename traits_type::pos_type
 
using off_type = typename traits_type::off_type
 
using openmode = largeobjectaccess::openmode
 
using seekdir = largeobjectaccess::seekdir
 

Public Member Functions

 largeobject_streambuf (dbtransaction &t, largeobject o, openmode mode=default_mode, size_type buf_size=512)
 
 largeobject_streambuf (dbtransaction &t, oid o, openmode mode=default_mode, size_type buf_size=512)
 End a code block started by "ignore-deprecated-pre.hxx".
 
void process_notice (zview const &s)
 For use by large object stream classes.
 

Static Public Attributes

static constexpr auto default_mode
 Default open mode: in, out, binary.
 

Protected Member Functions

virtual int sync () override
 
virtual pos_type seekoff (off_type offset, seekdir dir, openmode) override
 
virtual pos_type seekpos (pos_type pos, openmode) override
 
virtual int_type overflow (int_type ch) override
 
virtual int_type overflow ()
 
virtual int_type underflow () override
 

Detailed Description

template<typename CHAR = char, typename TRAITS = std::char_traits<CHAR>>
class pqxx::largeobject_streambuf< CHAR, TRAITS >

Accessor for large object's contents.

Deprecated
Use the blob class instead.

Streambuf to use large objects in standard I/O streams.

Deprecated
Access large objects directly using the blob class.

The standard streambuf classes provide uniform access to data storage such as files or string buffers, so they can be accessed using standard input or output streams. This streambuf implementation provided similar access to large objects, so they could be read and written using the same stream classes.

This functionality was considered too fragile and complex, so it has been replaced with a single, much simpler class.

Member Data Documentation

◆ default_mode

template<typename CHAR = char, typename TRAITS = std::char_traits<CHAR>>
auto pqxx::largeobject_streambuf< CHAR, TRAITS >::default_mode
staticconstexpr
Initial value:
{
std::ios::in | std::ios::out | std::ios::binary}

Default open mode: in, out, binary.


The documentation for this class was generated from the following file: