mirror of
https://github.com/rbock/sqlpp11.git
synced 2024-11-15 20:31:16 +08:00
Started to use flags to indicate database traits
e.g. support for any or outer join, or how string concatenation is implemented
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a17a8ecfa6
commit
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@ -72,6 +72,7 @@ namespace sqlpp
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template<typename Db>
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template<typename Db>
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void serialize(std::ostream& os, Db& db) const
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void serialize(std::ostream& os, Db& db) const
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{
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{
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static_assert(Db::_supports_any, "any() not supported by current database");
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os << "ANY(";
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os << "ANY(";
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_select.serialize(os, db);
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_select.serialize(os, db);
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os << ")";
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os << ")";
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@ -74,9 +74,19 @@ namespace sqlpp
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template<typename Db>
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template<typename Db>
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void serialize(std::ostream& os, Db& db) const
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void serialize(std::ostream& os, Db& db) const
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{
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{
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os << "CONCAT(";
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static_assert(Db::_use_concat_operator or Db::_use_concat_function, "neither concat operator nor concat function supported by current database");
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detail::serialize_tuple(os, db, _args, ',');
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if (Db::_use_concat_operator)
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os << ")";
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{
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os << "(";
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detail::serialize_tuple(os, db, _args, "||");
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os << ")";
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}
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else if (Db::_use_concat_function)
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{
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os << "CONCAT(";
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detail::serialize_tuple(os, db, _args, ',');
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os << ")";
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}
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}
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}
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private:
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private:
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@ -38,8 +38,8 @@ namespace sqlpp
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template<std::size_t begin, std::size_t index, std::size_t end>
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template<std::size_t begin, std::size_t index, std::size_t end>
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struct tuple_serializer_impl
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struct tuple_serializer_impl
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{
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{
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template<typename Db, typename Tuple>
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template<typename Db, typename Tuple, typename Separator>
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static void serialize(std::ostream& os, Db& db, const Tuple& flags_and_columns, char separator)
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static void serialize(std::ostream& os, Db& db, const Tuple& flags_and_columns, const Separator& separator)
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{
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{
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if (index > begin)
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if (index > begin)
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os << separator;
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os << separator;
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@ -56,14 +56,14 @@ namespace sqlpp
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template<std::size_t begin, std::size_t end>
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template<std::size_t begin, std::size_t end>
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struct tuple_serializer_impl<begin, end, end>
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struct tuple_serializer_impl<begin, end, end>
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{
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{
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template<typename Db, typename Tuple>
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template<typename Db, typename Tuple, typename Separator>
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static void serialize(std::ostream& os, Db& db, const Tuple& flags_and_columns, char separator)
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static void serialize(std::ostream& os, Db& db, const Tuple& flags_and_columns, const Separator& separator)
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{
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{
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}
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}
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};
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};
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template<typename Db, typename Tuple>
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template<typename Db, typename Tuple, typename Separator>
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static void serialize_tuple(std::ostream& os, Db& db, const Tuple& flags_and_columns, char separator)
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static void serialize_tuple(std::ostream& os, Db& db, const Tuple& flags_and_columns, const Separator& separator)
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{
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{
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tuple_serializer_impl<0, 0, std::tuple_size<Tuple>::value>::serialize(os, db, flags_and_columns, separator);
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tuple_serializer_impl<0, 0, std::tuple_size<Tuple>::value>::serialize(os, db, flags_and_columns, separator);
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}
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}
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@ -101,7 +101,7 @@ namespace sqlpp
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template<typename Db>
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template<typename Db>
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void serialize(std::ostream& os, Db& db) const
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void serialize(std::ostream& os, Db& db) const
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{
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{
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os << '"' << db.escape(_t) << '"';
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os << '\'' << db.escape(_t) << '\'';
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}
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}
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bool _is_trivial() const { return _t.empty(); }
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bool _is_trivial() const { return _t.empty(); }
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@ -34,18 +34,42 @@ namespace sqlpp
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{
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{
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struct inner_join_t
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struct inner_join_t
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{
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{
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template<typename Db>
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struct _is_supported
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{
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static constexpr bool value = Db::_supports_inner_join;
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};
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static constexpr const char* _name = " INNER ";
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static constexpr const char* _name = " INNER ";
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};
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};
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struct outer_join_t
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struct outer_join_t
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{
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{
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template<typename Db>
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struct _is_supported
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{
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static constexpr bool value = Db::_supports_outer_join;
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};
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static constexpr const char* _name = " OUTER ";
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static constexpr const char* _name = " OUTER ";
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};
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};
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struct left_outer_join_t
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struct left_outer_join_t
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{
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{
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template<typename Db>
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struct _is_supported
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{
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static constexpr bool value = Db::_supports_left_outer_join;
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};
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static constexpr const char* _name = " LEFT OUTER ";
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static constexpr const char* _name = " LEFT OUTER ";
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};
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};
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struct right_outer_join_t
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struct right_outer_join_t
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{
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{
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template<typename Db>
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struct _is_supported
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{
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static constexpr bool value = Db::_supports_right_outer_join;
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};
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static constexpr const char* _name = " RIGHT OUTER ";
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static constexpr const char* _name = " RIGHT OUTER ";
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};
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};
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@ -109,6 +133,7 @@ namespace sqlpp
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void serialize(std::ostream& os, Db& db) const
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void serialize(std::ostream& os, Db& db) const
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{
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{
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// FIXME: Need to check if db supports the join type. e.g. sqlite does not support right outer or full outer join
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// FIXME: Need to check if db supports the join type. e.g. sqlite does not support right outer or full outer join
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static_assert(JoinType::template _is_supported<Db>::value, "join type not supported by current database");
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static_assert(not is_noop<On>::value, "joined tables require on()");
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static_assert(not is_noop<On>::value, "joined tables require on()");
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_lhs.serialize(os, db);
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_lhs.serialize(os, db);
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os << JoinType::_name;
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os << JoinType::_name;
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@ -72,6 +72,7 @@ namespace sqlpp
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template<typename Db>
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template<typename Db>
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void serialize(std::ostream& os, Db& db) const
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void serialize(std::ostream& os, Db& db) const
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{
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{
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static_assert(Db::_supports_some, "some() not supported by current database");
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os << "SOME(";
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os << "SOME(";
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_select.serialize(os, db);
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_select.serialize(os, db);
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os << ")";
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os << ")";
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@ -25,12 +25,18 @@
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#include "TabSample.h"
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#include "TabSample.h"
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#include <sqlpp11/select.h>
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#include <sqlpp11/select.h>
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#include <sqlpp11/functions.h>
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#include <sqlpp11/connection.h>
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#include <sqlpp11/connection.h>
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#include <iostream>
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#include <iostream>
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class DbMock: public sqlpp::connection
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class DbMock: public sqlpp::connection
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{
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{
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public:
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public:
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static constexpr bool _supports_any = true;
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static constexpr bool _use_concat_function = true;
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static constexpr bool _use_concat_operator = false;
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const std::string& escape(const std::string& text) { return text; }
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const std::string& escape(const std::string& text) { return text; }
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};
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};
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@ -266,7 +272,7 @@ int main()
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{
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{
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auto s = dynamic_select(db, all_of(t)).dynamic_from().dynamic_where().dynamic_limit().dynamic_offset();
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auto s = dynamic_select(db, all_of(t)).dynamic_from().dynamic_where().dynamic_limit().dynamic_offset();
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s = s.add_from(t);
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s = s.add_from(t);
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s = s.add_where(t.alpha > 7);
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s = s.add_where(t.alpha > 7 and t.alpha == any(select(t.alpha).from(t).where(t.alpha < 3)));
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s = s.set_limit(30);
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s = s.set_limit(30);
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s = s.set_limit(3);
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s = s.set_limit(3);
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std::cerr << "------------------------\n";
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std::cerr << "------------------------\n";
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