mirror of
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93 lines
2.7 KiB
C++
93 lines
2.7 KiB
C++
/* Definition of the pqxx::errorhandler class.
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*
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* pqxx::errorhandler handlers errors and warnings in a database session.
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*
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* DO NOT INCLUDE THIS FILE DIRECTLY; include pqxx/errorhandler instead.
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*
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* Copyright (c) 2000-2022, Jeroen T. Vermeulen.
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*
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* See COPYING for copyright license. If you did not receive a file called
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* COPYING with this source code, please notify the distributor of this
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* mistake, or contact the author.
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*/
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#ifndef PQXX_H_ERRORHANDLER
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#define PQXX_H_ERRORHANDLER
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#if !defined(PQXX_HEADER_PRE)
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# error "Include libpqxx headers as <pqxx/header>, not <pqxx/header.hxx>."
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#endif
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#include "pqxx/types.hxx"
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namespace pqxx::internal::gate
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{
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class errorhandler_connection;
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}
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namespace pqxx
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{
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/**
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* @addtogroup errorhandler
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*/
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//@{
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/// Base class for error-handler callbacks.
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/** To receive errors and warnings from a connection, subclass this with your
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* own error-handler functor, and instantiate it for the connection. Destroying
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* the handler un-registers it.
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*
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* A connection can have multiple error handlers at the same time. When the
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* database connection emits an error or warning message, it passes the message
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* to each error handler, starting with the most recently registered one and
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* progressing towards the oldest one. However an error handler may also
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* instruct the connection not to pass the message to further handlers by
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* returning "false."
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*
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* @warning Strange things happen when a result object outlives its parent
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* connection. If you register an error handler on a connection, then you must
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* not access the result after destroying the connection. This applies even if
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* you destroy the error handler first!
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*/
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class PQXX_LIBEXPORT errorhandler
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{
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public:
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explicit errorhandler(connection &);
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virtual ~errorhandler();
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/// Define in subclass: receive an error or warning message from the
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/// database.
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/**
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* @return Whether the same error message should also be passed to the
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* remaining, older errorhandlers.
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*/
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virtual bool operator()(char const msg[]) noexcept = 0;
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errorhandler() = delete;
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errorhandler(errorhandler const &) = delete;
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errorhandler &operator=(errorhandler const &) = delete;
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private:
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connection *m_home;
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friend class internal::gate::errorhandler_connection;
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void unregister() noexcept;
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};
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/// An error handler that suppresses any previously registered error handlers.
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class quiet_errorhandler : public errorhandler
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{
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public:
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/// Suppress error notices.
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quiet_errorhandler(connection &conn) : errorhandler{conn} {}
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/// Revert to previous handling of error notices.
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virtual bool operator()(char const[]) noexcept override { return false; }
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};
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//@}
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} // namespace pqxx
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#endif
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