mirror of
https://github.com/rbock/sqlpp11.git
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Added support for dynamic columns to select_expression_list
Dynamic columns are not yet supported in results, though.
This commit is contained in:
Roland Bock
parent
3718f4a57c
commit
902583a33b
98
include/sqlpp11/detail/named_serializable.h
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98
include/sqlpp11/detail/named_serializable.h
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@ -0,0 +1,98 @@
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/*
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* Copyright (c) 2013, Roland Bock
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice, this
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* list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SQLPP_NAMED_SERIALIZABLE_H
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#define SQLPP_NAMED_SERIALIZABLE_H
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#include <ostream>
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#include <vector>
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#include <memory>
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namespace sqlpp
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{
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namespace detail
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{
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template<typename Db>
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struct named_serializable_t
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{
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template<typename T>
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named_serializable_t(T&& t):
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_impl(std::make_shared<_impl_t<typename std::decay<T>::type>>(std::forward<T>(t)))
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{}
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named_serializable_t(const named_serializable_t&) = default;
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named_serializable_t(named_serializable_t&&) = default;
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named_serializable_t& operator=(const named_serializable_t&) = default;
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named_serializable_t& operator=(named_serializable_t&&) = default;
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~named_serializable_t() = default;
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void serialize(std::ostream& os, Db& db) const
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{
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_impl->serialize(os, db);
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}
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std::string _get_name() const
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{
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_impl->_get_name();
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}
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private:
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struct _impl_base
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{
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virtual void serialize(std::ostream& os, Db& db) const = 0;
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virtual std::string _get_name() const = 0;
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};
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template<typename T>
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struct _impl_t: public _impl_base
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{
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_impl_t(const T& t):
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_t(t)
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{}
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_impl_t(T&& t):
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_t(std::move(t))
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{}
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void serialize(std::ostream& os, Db& db) const
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{
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_t.serialize(os, db);
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}
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std::string _get_name() const
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{
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T::_name_t::_get_name();
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}
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T _t;
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};
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std::shared_ptr<const _impl_base> _impl;
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};
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}
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}
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#endif
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@ -27,13 +27,11 @@
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#ifndef SQLPP_SELECT_H
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#define SQLPP_SELECT_H
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#include <sqlpp11/result_row.h>
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#include <sqlpp11/result.h>
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#include <sqlpp11/select_fwd.h>
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#include <sqlpp11/noop.h>
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#include <sqlpp11/select_flag_list.h>
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#include <sqlpp11/select_expression_list.h>
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#include <sqlpp11/select_pseudo_table.h>
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#include <sqlpp11/from.h>
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#include <sqlpp11/where.h>
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#include <sqlpp11/group_by.h>
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@ -42,7 +40,6 @@
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#include <sqlpp11/limit.h>
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#include <sqlpp11/offset.h>
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#include <sqlpp11/expression.h>
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#include <sqlpp11/field.h>
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#include <sqlpp11/detail/wrong.h>
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#include <sqlpp11/detail/make_flag_tuple.h>
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@ -55,7 +52,7 @@ namespace sqlpp
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template<
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typename Database,
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typename Flags,
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typename... NamedExpr,
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typename ExpressionList,
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typename From,
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typename Where,
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typename GroupBy,
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@ -64,11 +61,11 @@ namespace sqlpp
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typename Limit,
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typename Offset
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>
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struct select_t<Database, Flags, select_expression_list_t<std::tuple<NamedExpr...>>, From, Where, GroupBy, Having, OrderBy, Limit, Offset>
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: public select_expression_list_t<std::tuple<NamedExpr...>>::_value_type::template operators<select_t<
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struct select_t
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: public ExpressionList::_value_type::template operators<select_t<
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Database,
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Flags,
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select_expression_list_t<std::tuple<NamedExpr...>>,
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ExpressionList,
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From,
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Where,
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GroupBy,
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@ -79,7 +76,6 @@ namespace sqlpp
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{
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using _Database = Database;
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using _From = From;
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using ExpressionList = select_expression_list_t<std::tuple<NamedExpr...>>;
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static_assert(is_noop<Flags>::value or is_select_flag_list_t<Flags>::value, "invalid list of select flags");
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static_assert(is_select_expression_list_t<ExpressionList>::value, "invalid list of select expressions");
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@ -94,6 +90,8 @@ namespace sqlpp
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using _is_select = std::true_type;
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using _requires_braces = std::true_type;
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template<typename ExpressionListT>
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using set_expression_list_t = select_t<Database, Flags, ExpressionListT, From, Where, GroupBy, Having, OrderBy, Limit, Offset>;
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template<typename FromT>
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using set_from_t = select_t<Database, Flags, ExpressionList, FromT, Where, GroupBy, Having, OrderBy, Limit, Offset>;
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template<typename WhereT>
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@ -109,7 +107,7 @@ namespace sqlpp
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template<typename OffsetT>
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using set_offset_t = select_t<Database, Flags, ExpressionList, From, Where, GroupBy, Having, OrderBy, Limit, OffsetT>;
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using _result_row_t = result_row_t<make_field_t<NamedExpr>...>;
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using _result_row_t = typename ExpressionList::_result_row_t;
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// Indicators
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using _value_type = typename std::conditional<
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@ -166,6 +164,34 @@ namespace sqlpp
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{
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}
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auto dynamic_columns()
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-> set_expression_list_t<typename ExpressionList::template _dynamic_t<Database>>
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{
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static_assert(not std::is_same<Database, void>::value, "cannot call dynamic_from() in a non-dynamic select");
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static_assert(is_noop<From>::value, "cannot call dynamic_columns() after from()");
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return {
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_flags,
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{_expression_list._expressions},
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_from,
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_where,
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_group_by,
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_having,
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_order_by,
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_limit,
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_offset
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};
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}
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template<typename NamedExpr>
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select_t& add_column(NamedExpr&& namedExpr)
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{
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static_assert(is_dynamic_t<ExpressionList>::value, "cannot call add_column() in a non-dynamic column list");
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_expression_list.add(std::forward<NamedExpr>(namedExpr));
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return *this;
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}
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// sqlpp functions
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template<typename... Table>
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auto from(Table&&... table)
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@ -497,7 +523,7 @@ namespace sqlpp
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template<typename AliasProvider>
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struct _pseudo_table_t
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{
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using table = select_pseudo_table_t<select_t, NamedExpr...>;
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using table = typename ExpressionList::template _pseudo_table_t<select_t>;
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using alias = typename table::template alias_t<AliasProvider>;
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};
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@ -573,11 +599,12 @@ namespace sqlpp
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{
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template<typename... Expr>
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using make_select_expression_list_t =
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select_expression_list_t<decltype(make_expression_tuple(std::declval<Expr>()...))>;
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select_expression_list_t<void, decltype(make_expression_tuple(std::declval<Expr>()...))>;
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}
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template<typename... NamedExpr>
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select_t<void, detail::make_select_flag_list_t<NamedExpr...>, detail::make_select_expression_list_t<NamedExpr...>> select(NamedExpr&&... namedExpr)
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auto select(NamedExpr&&... namedExpr)
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-> select_t<void, detail::make_select_flag_list_t<NamedExpr...>, detail::make_select_expression_list_t<NamedExpr...>>
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{
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return {
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{ detail::make_flag_tuple(std::forward<NamedExpr>(namedExpr)...) },
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@ -585,12 +612,24 @@ namespace sqlpp
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};
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}
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template<typename Db, typename... NamedExpr>
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select_t<typename std::decay<Db>::type, detail::make_select_flag_list_t<NamedExpr...>, detail::make_select_expression_list_t<NamedExpr...>> dynamic_select(const Db& db, NamedExpr&&... namedExpr)
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auto dynamic_select(const Db& db, NamedExpr&&... namedExpr)
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-> select_t<typename std::decay<Db>::type, detail::make_select_flag_list_t<NamedExpr...>, detail::make_select_expression_list_t<NamedExpr...>>
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{
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return {
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{ detail::make_flag_tuple(std::forward<NamedExpr>(namedExpr)...) },
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{ detail::make_expression_tuple(std::forward<NamedExpr>(namedExpr)...) }
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};
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}
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#warning: need to add dynamic fields
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/* Idea: Use a vector of serializable or similar for select.
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* Translate the vector into a map<string, text-similar with an index>, first = name, second = something similar to text which knows its index
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*
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* What about default constructing the result? Not a problem. The map is empty then.
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*
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* But how to transport the vector of serializables from the select into the result?
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*
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* Maybe store the names of the map content in a field in the query?
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*/
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}
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#endif
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@ -32,7 +32,11 @@
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#include <sqlpp11/select_fwd.h>
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#include <sqlpp11/expression_fwd.h>
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#include <sqlpp11/no_value.h>
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#include <sqlpp11/field.h>
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#include <sqlpp11/result_row.h>
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#include <sqlpp11/table_base.h>
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#include <sqlpp11/select_pseudo_table.h>
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#include <sqlpp11/detail/named_serializable.h>
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#include <sqlpp11/detail/serialize_tuple.h>
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#include <sqlpp11/detail/set.h>
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@ -40,17 +44,39 @@ namespace sqlpp
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{
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namespace detail
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{
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template<typename T, typename... Rest>
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struct get_first_argument
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template<typename... Rest>
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struct get_first_argument_if_unique
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{
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using type = T;
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using _value_type = no_value_t;
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struct _name_t {};
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};
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template<typename T>
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struct get_first_argument_if_unique<T>
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{
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using _value_type = typename T::_value_type;
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using _name_t = typename T::_name_t;
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};
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template<typename Db>
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struct dynamic_select_expression_list
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{
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using type = std::vector<detail::named_serializable_t<Db>>;
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};
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template<>
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struct dynamic_select_expression_list<void>
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{
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using type = std::vector<noop>;
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};
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}
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template<typename... NamedExpr>
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struct select_expression_list_t<std::tuple<NamedExpr...>>
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template<typename Database, typename... NamedExpr>
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struct select_expression_list_t<Database, std::tuple<NamedExpr...>>
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{
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// check for at least one select expression
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static_assert(sizeof...(NamedExpr), "at least one select expression required");
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using _is_select_expression_list = std::true_type;
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using _is_dynamic = typename std::conditional<std::is_same<Database, void>::value, std::false_type, std::true_type>::type;
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// check for duplicate select expressions
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static_assert(not detail::has_duplicates<NamedExpr...>::value, "at least one duplicate argument detected");
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@ -64,27 +90,50 @@ namespace sqlpp
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// check for duplicate select expression names
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static_assert(not detail::has_duplicates<typename NamedExpr::_name_t...>::value, "at least one duplicate name detected");
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// declare this to be a select expression
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using _is_select_expression_list = std::true_type;
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// provide type information for sub-selects that are used as expressions
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struct _column_type {};
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struct _value_type: std::conditional<sizeof...(NamedExpr) == 1, typename detail::get_first_argument<NamedExpr...>::type::_value_type, no_value_t>::type
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struct _value_type: detail::get_first_argument_if_unique<NamedExpr...>::_value_type
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{
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using _is_expression = typename std::conditional<sizeof...(NamedExpr) == 1, std::true_type, std::false_type>::type;
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using _is_named_expression = typename std::conditional<sizeof...(NamedExpr) == 1, std::true_type, std::false_type>::type;
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using _is_alias = std::false_type;
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};
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struct _no_name_t {};
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using _name_t = typename std::conditional<sizeof...(NamedExpr) == 1, typename detail::get_first_argument<NamedExpr...>::type::_name_t, _no_name_t>::type;
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using _name_t = typename detail::get_first_argument_if_unique<NamedExpr...>::_name_t;
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using _result_row_t = result_row_t<make_field_t<NamedExpr>...>;
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template <typename Select>
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using _pseudo_table_t = select_pseudo_table_t<Select, NamedExpr...>;
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template <typename Db>
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using _dynamic_t = select_expression_list_t<Db, std::tuple<NamedExpr...>>;
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template<typename Expr>
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void add(Expr&& namedExpr)
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{
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static_assert(is_named_expression_t<typename std::decay<Expr>::type>::value, "select() arguments require to be named expressions");
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_dynamic_expressions.push_back(std::forward<Expr>(namedExpr));
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}
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template<typename Db>
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void serialize(std::ostream& os, Db& db) const
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{
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// check for at least one select expression
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static_assert(_is_dynamic::value or sizeof...(NamedExpr), "at least one select expression required");
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detail::serialize_tuple(os, db, _expressions, ',');
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bool first = sizeof...(NamedExpr) == 0;
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for (const auto column : _dynamic_expressions)
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{
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if (not first)
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os << ',';
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column.serialize(os, db);
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first = false;
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}
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}
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std::tuple<NamedExpr...> _expressions;
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typename detail::dynamic_select_expression_list<Database>::type _dynamic_expressions;
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};
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}
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@ -38,7 +38,7 @@ namespace sqlpp
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struct straight_join_t;
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template<typename FlagTuple> struct select_flag_list_t;
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template<typename NamedExprTuple> struct select_expression_list_t;
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template<typename Database, typename NamedExprTuple> struct select_expression_list_t;
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template<typename... TableOrJoin> struct from_t;
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@ -25,9 +25,10 @@
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#include "TabSample.h"
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#include <sqlpp11/select.h>
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#include <sqlpp11/connection.h>
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#include <iostream>
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class DbMock
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class DbMock: public sqlpp::connection
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{
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public:
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const std::string& escape(const std::string& text) { return text; }
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@ -273,6 +274,12 @@ int main()
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std::cerr << "------------------------\n";
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}
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// Test that select can be called with zero columns if it is used with dynamic columns.
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{
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auto s = dynamic_select(db).dynamic_columns().add_column(t.alpha);
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s.serialize(std::cerr, db);
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}
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static_assert(sqlpp::is_select_flag_t<decltype(sqlpp::all)>::value, "sqlpp::all has to be a select_flag");
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using T = sqlpp::detail::wrap_operand<int>::type;
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