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// // Copyright (c) 2019-2025 Ruben Perez Hidalgo (rubenperez038 at gmail dot com) // // 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_MYSQL_RESULTS_HPP #define BOOST_MYSQL_RESULTS_HPP #include #include #include #include #include #include #include #include #include #include #include namespace boost { namespace mysql { /** * \brief Holds the results of a SQL query (dynamic interface). * \details * This object can store the results of single and multi resultset queries. * For the former, you use \ref meta, \ref rows, \ref affected_rows and so on. * For the latter, this class is a random-access collection of \ref resultset objects. * \n * \par Thread safety * Distinct objects: safe. \n * Shared objects: unsafe. \n */ class results { public: #ifdef BOOST_MYSQL_DOXYGEN /** * \brief A random access iterator to an element. * \details The exact type of the iterator is unspecified. */ using iterator = __see_below__; #else using iterator = detail::results_iterator; #endif /// \copydoc iterator using const_iterator = iterator; /// A type that can hold elements in this collection with value semantics. using value_type = resultset; /// The reference type. using reference = resultset_view; /// \copydoc reference using const_reference = resultset_view; /// An unsigned integer type to represent sizes. using size_type = std::size_t; /// A signed integer type used to represent differences. using difference_type = std::ptrdiff_t; /** * \brief Default constructor. * \details Constructs an empty results object, with `this->has_value() == false`. * * \par Exception safety * No-throw guarantee. */ results() = default; /** * \brief Copy constructor. * \par Exception safety * Strong guarantee. Internal allocations may throw. */ results(const results& other) = default; /** * \brief Move constructor. * \par Exception safety * No-throw guarantee. * * \par Object lifetimes * View objects obtained from `other` using \ref rows and \ref meta remain valid. * Any other views and iterators referencing `other` are invalidated. */ results(results&& other) = default; /** * \brief Copy assignment. * \par Exception safety * Basic guarantee. Internal allocations may throw. * * \par Object lifetimes * Views and iterators referencing `*this` are invalidated. */ results& operator=(const results& other) = default; /** * \brief Move assignment. * \par Exception safety * Basic guarantee. Internal allocations may throw. * * \par Object lifetimes * View objects obtained from `other` using \ref rows and \ref meta remain valid. * Any other views and iterators referencing `other` are invalidated. Views and iterators * referencing `*this` are invalidated. */ results& operator=(results&& other) = default; /// Destructor ~results() = default; /** * \brief Returns whether the object holds a valid result. * \details Having `this->has_value()` is a precondition to call all data accessors. * Objects populated by \ref connection::execute and \ref connection::async_execute * are guaranteed to have `this->has_value() == true`. * * \par Exception safety * No-throw guarantee. * * \par Complexity * Constant. */ bool has_value() const noexcept { return impl_.is_complete(); } /** * \brief Returns the rows retrieved by the SQL query. * \details * For operations returning more than one resultset, returns the rows * for the first resultset. * * \par Preconditions * `this->has_value() == true` * * \par Exception safety * No-throw guarantee. * * \par Object lifetimes * This function returns a view object, with reference semantics. The returned view points into * memory owned by `*this`, and will be valid as long as `*this` or an object move-constructed * from `*this` are alive. * * \par Complexity * Constant. */ rows_view rows() const noexcept { BOOST_ASSERT(has_value()); return impl_.get_rows(0); } /** * \brief Returns metadata about the columns in the query. * \details * The returned collection will have as many \ref metadata objects as columns retrieved by * the SQL query, and in the same order. * \n * For operations returning more than one resultset, returns metadata * for the first resultset. * * \par Preconditions * `this->has_value() == true` * * \par Exception safety * No-throw guarantee. * * \par Object lifetimes * This function returns a view object, with reference semantics. The returned view points into * memory owned by `*this`, and will be valid as long as `*this` or an object move-constructed * from `*this` are alive. * * \par Complexity * Constant. */ metadata_collection_view meta() const noexcept { BOOST_ASSERT(has_value()); return impl_.get_meta(0); } /** * \brief Returns the number of rows affected by the executed SQL statement. * \details * Note that this is NOT the number of matched rows. If a row * is matched but not affected, it won't be accounted for here. * * For operations returning more than one resultset, returns the * first resultset's affected rows. * * \par Preconditions * `this->has_value() == true` * * \par Exception safety * No-throw guarantee. * * \par Complexity * Constant. */ std::uint64_t affected_rows() const noexcept { BOOST_ASSERT(has_value()); return impl_.get_affected_rows(0); } /** * \brief Returns the last insert ID produced by the executed SQL statement. * \details * For operations returning more than one resultset, returns the * first resultset's last insert ID. * * \par Preconditions * `this->has_value() == true` * * \par Exception safety * No-throw guarantee. * * \par Complexity * Constant. */ std::uint64_t last_insert_id() const noexcept { BOOST_ASSERT(has_value()); return impl_.get_last_insert_id(0); } /** * \brief Returns the number of warnings produced by the executed SQL statement. * \details * For operations returning more than one resultset, returns the * first resultset's warning count. * * \par Preconditions * `this->has_value() == true` * * \par Exception safety * No-throw guarantee. * * \par Complexity * Constant. */ unsigned warning_count() const noexcept { BOOST_ASSERT(has_value()); return impl_.get_warning_count(0); } /** * \brief Returns additional text information about the execution of the SQL statement. * \details * The format of this information is documented by MySQL here. * \n * The returned string always uses ASCII encoding, regardless of the connection's character set. * \n * For operations returning more than one resultset, returns the * first resultset's info. * * \par Preconditions * `this->has_value() == true` * * \par Exception safety * No-throw guarantee. * * \par Object lifetimes * This function returns a view object, with reference semantics. The returned view points into * memory owned by `*this`, and will be valid as long as `*this` or an object move-constructed * from `*this` are alive. * * \par Complexity * Constant. */ string_view info() const noexcept { BOOST_ASSERT(has_value()); return impl_.get_info(0); } /** * \brief Returns an iterator pointing to the first resultset that this object contains. * \par Preconditions * `this->has_value() == true` * * \par Exception safety * No-throw guarantee. * * \par Object lifetimes * The returned iterator and any reference obtained from it are valid as long as * `*this` is alive. Move operations invalidate iterators. * * \par Complexity * Constant. */ iterator begin() const noexcept { BOOST_ASSERT(has_value()); return iterator(&impl_, 0); } /** * \brief Returns an iterator pointing to one-past-the-last resultset that this object contains. * \par Preconditions * `this->has_value() == true` * * \par Exception safety * No-throw guarantee. * * \par Object lifetimes * The returned iterator and any reference obtained from it are valid as long as * `*this` is alive. Move operations invalidate iterators. * * \par Complexity * Constant. */ iterator end() const noexcept { BOOST_ASSERT(has_value()); return iterator(&impl_, size()); } /** * \brief Returns the i-th resultset or throws an exception. * \par Preconditions * `this->has_value() == true` * * \par Exception safety * Strong guranatee. Throws on invalid input. * \throws std::out_of_range `i >= this->size()` * * \par Object lifetimes * The returned reference and any other references obtained from it are valid as long as * `*this` is alive. Move operations invalidate references. * * \par Complexity * Constant. */ inline resultset_view at(std::size_t i) const { BOOST_ASSERT(has_value()); if (i >= size()) BOOST_THROW_EXCEPTION(std::out_of_range("results::at: out of range")); return detail::access::construct(impl_, i); } /** * \brief Returns the i-th resultset (unchecked access). * \par Preconditions * `this->has_value() == true && i < this->size()` * * \par Exception safety * No-throw guarantee. * * \par Object lifetimes * The returned reference and any other references obtained from it are valid as long as * `*this` is alive. Move operations invalidate references. * * \par Complexity * Constant. */ resultset_view operator[](std::size_t i) const noexcept { BOOST_ASSERT(has_value()); BOOST_ASSERT(i < size()); return detail::access::construct(impl_, i); } /** * \brief Returns the first resultset. * \par Preconditions * `this->has_value() == true` * * \par Exception safety * No-throw guarantee. * * \par Object lifetimes * The returned reference and any other references obtained from it are valid as long as * `*this` is alive. Move operations invalidate references. * * \par Complexity * Constant. */ resultset_view front() const noexcept { return (*this)[0]; } /** * \brief Returns the last resultset. * \par Preconditions * `this->has_value() == true` * * \par Exception safety * No-throw guarantee. * * \par Object lifetimes * The returned reference and any other references obtained from it are valid as long as * `*this` is alive. Move operations invalidate references. * * \par Complexity * Constant. */ resultset_view back() const noexcept { return (*this)[size() - 1]; } /** * \brief Returns whether the collection contains any resultset. * \details * This function is provided for compatibility with standard collections, * and always returns false, since any valid `results` contains at least one resultset. * * \par Preconditions * `this->has_value() == true` * * \par Exception safety * No-throw guarantee. * * \par Complexity * Constant. */ bool empty() const noexcept { BOOST_ASSERT(has_value()); return false; } /** * \brief Returns the number of resultsets that this collection contains. * \par Preconditions * `this->has_value() == true` * * \par Exception safety * No-throw guarantee. * * \par Complexity * Constant. */ std::size_t size() const noexcept { BOOST_ASSERT(has_value()); return impl_.num_resultsets(); } /** * \brief Returns the output parameters of a stored procedure call. * \details * Relevant for `CALL` operations performed using prepared statements that * bind placeholders to `OUT` or `INOUT` parameters. Returns a row containing a field per * bound output parameter. * \n * If this operation had no output parameters (e.g. it wasn't a `CALL`), returns an empty row. * * \par Preconditions * `this->has_value() == true` * * \par Exception safety * No-throw guarantee. * * \par Object lifetimes * The returned reference and any other references obtained from it are valid as long as * `*this` is alive. Move operations invalidate references. * * \par Complexity * Linear on `this->size()`. */ row_view out_params() const noexcept { BOOST_ASSERT(has_value()); return impl_.get_out_params(); } private: detail::results_impl impl_; #ifndef BOOST_MYSQL_DOXYGEN friend struct detail::access; #endif }; } // namespace mysql } // namespace boost #endif