Class pqxx::array_parser: Use pqxx::array instead.
Class pqxx::basic_fieldstream< CHAR, TRAITS >: To convert a field's value string to some other type, e.g. to an int, use the field's as<...>() member function. To read a field efficiently just as a string, use its c_str() or its as<std::string_vview>().
Class pqxx::basic_ilostream< CHAR, TRAITS >: Access large objects directly using the blob class.
Class pqxx::basic_lostream< CHAR, TRAITS >: Access large objects directly using the blob class.
Class pqxx::basic_olostream< CHAR, TRAITS >: Access large objects directly using the blob class.
Class pqxx::binarystring: Use bytes and bytes_view for binary data. In C++20 or better, any contiguous_range of std::byte will do.
Member pqxx::blob::read (std::vector< std::byte, ALLOC > &buf): As libpqxx moves to C++20 as its baseline language version, this will take and return std::span<std::byte>.
Member pqxx::connection::get_errorhandlers () const: Return pointers to the active errorhandlers.
Member pqxx::connection::set_variable (std::string_view var, std::string_view value) &: To set a session variable, use set_session_var. To set a transaction-local variable, execute an SQL SET command.
Member pqxx::connection_base: Old base class for connection. They are now the same class.
Member pqxx::encrypt_password (zview user, zview password): Use connection::encrypt_password instead.
Member pqxx::encrypt_password (char const user[], char const password[]): Use connection::encrypt_password instead.
Class pqxx::errorhandler: Base class for obsolete error-handler callbacks.
Member pqxx::fieldstream: Read a field using field::as<...>() or field::c_str().
Member pqxx::from_query: Use transaction_base::stream instead of stream_from.
Struct pqxx::from_query_t: Use stream_from::query() instead.
Member pqxx::from_table: Use transaction_base::stream instead of stream_from.
Struct pqxx::from_table_t: Use stream_from::table() instead.
Class pqxx::internal::dynamic_params< IT, ACCESSOR >: Use params instead.
Class pqxx::largeobject: Use the blob class instead.
Class pqxx::largeobject_streambuf< CHAR, TRAITS >: Access large objects directly using the blob class.
Class pqxx::largeobjectaccess: Use the blob class instead.
Member pqxx::operator<< (std::basic_ostream< CHAR > &s, field const &value): The C++ streams library is not great to work with. In particular, error handling is easy to get wrong. So you're probably better off doing this by hand.
Member pqxx::params::append (binarystring const &value) &: Append binarystring parameter.
Namespace pqxx::prepare: The new params class replaces all of this.
Class pqxx::quiet_errorhandler: Use a notice handler instead.
Member pqxx::row::slice (size_type sbegin, size_type send) const: I haven't heard of anyone caring about row slicing at all in at least the last 15 years. Yet it adds complexity, so unless anyone files a bug explaining why they really need this feature, I'm going to remove it. Even if they do, the feature may need an update.
Class pqxx::stream_from: Use transaction_base::stream.
Member pqxx::stream_from::stream_from (transaction_base &tx, from_table_t, std::string_view table, Columns const &columns): Use factory function query instead.
Member pqxx::stream_from::stream_from (transaction_base &tx, std::string_view table): Use factories table or raw_table instead.
Member pqxx::stream_from::stream_from (transaction_base &tx, std::string_view table, Columns const &columns): Use factories table or raw_table instead.
Member pqxx::stream_from::stream_from (transaction_base &, std::string_view table, Iter columns_begin, Iter columns_end): Use factories table or raw_table instead.
Member pqxx::stream_from::stream_from (transaction_base &, from_table_t, std::string_view table, Iter columns_begin, Iter columns_end): Use factories table or raw_table instead.
Member pqxx::stream_from::stream_from (transaction_base &, from_table_t, std::string_view table): Use factories table or raw_table instead.
Member pqxx::stream_from::stream_from (transaction_base &, from_query_t, std::string_view query): Use factory function query instead.
Member pqxx::stream_to::stream_to (transaction_base &tx, std::string_view table_name): Use table or raw_table as a factory.
Member pqxx::stream_to::stream_to (transaction_base &, std::string_view table_name, Columns const &columns): Use table or raw_table as a factory.
Member pqxx::strip_t: In C++20 we'll replace this with std::remove_cvref.
Member pqxx::transaction_base::set_variable (std::string_view var, std::string_view value): To set a transaction-local variable, execute an SQL SET command. To set a session variable, use the connection's set_session_var function.