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Moved select-specific stuff into select_column_list

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This is a major step towards a generic statements and generic statement
policies.
This commit is contained in:
rbock 2014-05-27 18:15:37 +02:00
parent a5457e93f7
commit 76fc2fb397
2 changed files with 51 additions and 57 deletions
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63
include/sqlpp11/select.h
View File

@ -129,6 +129,12 @@ namespace sqlpp
using _extra_tables = detail::type_set<>;
};
static void _check_consistency()
{
#warning check for missing terms here, and for missing tables
static_assert(not required_tables_of<select_policies_t>::size::value, "one sub expression requires tables which are otherwise not known in the statement");
}
};
}
@ -147,18 +153,8 @@ namespace sqlpp
using _traits = make_traits<value_type_of<_policies_t>, ::sqlpp::tag::select, tag::expression_if<typename _policies_t::_is_expression>, tag::named_expression_if<typename _policies_t::_is_expression>>;
using _recursive_traits = typename _policies_t::_recursive_traits;
using _database_t = Db;
using _is_dynamic = typename std::conditional<std::is_same<_database_t, void>::value, std::false_type, std::true_type>::type;
using _result_type_provider = typename _policies_t::_result_type_provider;
using _parameter_tuple_t = std::tuple<Policies...>;
using _parameter_list_t = typename make_parameter_list_t<select_t>::type;
template<typename Database>
using _result_row_t = typename _result_type_provider::template _result_row_t<Database>;
using _dynamic_names_t = typename _result_type_provider::_dynamic_names_t;
using _requires_braces = std::true_type;
using _name_t = typename _result_type_provider::_name_t;
@ -178,53 +174,6 @@ namespace sqlpp
select_t& operator=(select_t&& r) = default;
~select_t() = default;
// PseudoTable
const _dynamic_names_t& get_dynamic_names() const
{
return static_cast<const _result_type_provider&>(*this)._dynamic_columns._dynamic_expression_names;
}
static constexpr size_t _get_static_no_of_parameters()
{
return _parameter_list_t::size::value;
}
size_t _get_no_of_parameters() const
{
return _parameter_list_t::size::value;
}
size_t get_no_of_result_columns() const
{
return _result_type_provider::static_size() + get_dynamic_names().size();
}
void _check_consistency() const
{
#warning check for missing terms here, and for missing tables
static_assert(not required_tables_of<_policies_t>::size::value, "one sub expression contains tables which are not in the from()");
}
// Execute
template<typename Database>
auto _run(Database& db) const
-> result_t<decltype(db.select(*this)), _result_row_t<Database>>
{
_check_consistency();
static_assert(_get_static_no_of_parameters() == 0, "cannot run select directly with parameters, use prepare instead");
return {db.select(*this), get_dynamic_names()};
}
// Prepare
template<typename Database>
auto _prepare(Database& db) const
-> prepared_select_t<Database, select_t>
{
_check_consistency();
return {{}, get_dynamic_names(), db.prepare_select(*this)};
}
};
namespace vendor

45
include/sqlpp11/vendor/select_column_list.h vendored
View File

@ -165,6 +165,7 @@ namespace sqlpp
using _dynamic_t = select_column_list_t<Db, std::tuple<Columns...>>;
select_column_list_t& _select_column_list() { return *this; }
const select_column_list_t& _select_column_list() const { return *this; }
select_column_list_t(std::tuple<Columns...> columns):
_columns(columns)
@ -246,6 +247,50 @@ namespace sqlpp
static_assert(Policies::_can_be_used_as_table::value, "statement cannot be used as table, e.g. due to missing tables");
return _table_t<AliasProvider>(static_cast<const _statement_t&>(*this)).as(aliasProvider);
}
const _dynamic_names_t& get_dynamic_names() const
{
return static_cast<const typename Policies::_statement_t*>(this)->_select_column_list()._dynamic_columns._dynamic_expression_names;
}
static constexpr size_t _get_static_no_of_parameters()
{
#warning need to fix this
return 0;
}
size_t _get_no_of_parameters() const
{
#warning need to fix this
return 0;
}
size_t get_no_of_result_columns() const
{
return static_size() + get_dynamic_names().size();
}
// Execute
template<typename Db>
auto _run(Db& db) const
-> result_t<decltype(db.select(std::declval<const _statement_t>())), _result_row_t<Db>>
{
Policies::_check_consistency();
static_assert(_get_static_no_of_parameters() == 0, "cannot run select directly with parameters, use prepare instead");
return {db.select(static_cast<const _statement_t&>(*this)), get_dynamic_names()};
}
#if 0
// Prepare
template<typename Db>
auto _prepare(Db& db) const
-> prepared_select_t<Db, select_t>
{
Policies::_check_consistency();
return {{}, get_dynamic_names(), db.prepare_select(*this)};
}
#endif
};