From 88fb6802608818b70617340b1ed826c1b8a9f1ea Mon Sep 17 00:00:00 2001 From: Constantin Michael Date: Fri, 27 May 2011 17:21:38 +0200 Subject: Add traits --- odb/pgsql/traits.cxx | 58 ++++++++++ odb/pgsql/traits.hxx | 291 +++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 349 insertions(+) create mode 100644 odb/pgsql/traits.cxx create mode 100644 odb/pgsql/traits.hxx diff --git a/odb/pgsql/traits.cxx b/odb/pgsql/traits.cxx new file mode 100644 index 0000000..bdffa45 --- /dev/null +++ b/odb/pgsql/traits.cxx @@ -0,0 +1,58 @@ +// file : odb/pgsql/traits.cxx +// author : Constantin Michael +// copyright : Copyright (c) 2005-2011 Code Synthesis Tools CC +// license : GNU GPL v2; see accompanying LICENSE file + +#include // std::memcpy, std::strlen + +#include + +using namespace std; + +namespace odb +{ + namespace pgsql + { + using details::buffer; + + // + // string_value_traits + // + + void string_value_traits:: + set_image (buffer& b, + size_t& n, + bool& is_null, + const string& v) + { + is_null = false; + n = v.size (); + + if (n > b.capacity ()) + b.capacity (n); + + if (n != 0) + memcpy (b.data (), v.c_str (), n); + } + + // + // c_string_value_traits + // + + void c_string_value_traits:: + set_image (buffer& b, + size_t& n, + bool& is_null, + const char* v) + { + is_null = false; + n = strlen (v); + + if (n > b.capacity ()) + b.capacity (n); + + if (n != 0) + memcpy (b.data (), v, n); + } + } +} diff --git a/odb/pgsql/traits.hxx b/odb/pgsql/traits.hxx new file mode 100644 index 0000000..62a6df2 --- /dev/null +++ b/odb/pgsql/traits.hxx @@ -0,0 +1,291 @@ +// file : odb/pgsql/traits.hxx +// author : Constantin Michael +// copyright : Copyright (c) 2005-2011 Code Synthesis Tools CC +// license : GNU GPL v2; see accompanying LICENSE file + +#ifndef ODB_PGSQL_TRAITS_HXX +#define ODB_PGSQL_TRAITS_HXX + +#include + +#include +#include // std::size_t + +#include + +#include + +#include +#include + +#include + +namespace odb +{ + namespace pgsql + { + enum database_type_id + { + id_boolean, + id_smallint, + id_integer, + id_bigint, + id_numeric, + id_real, + id_double, + id_serial, + id_bigserial, + + id_string + }; + + // + // image_traits + // + + template + struct image_traits; + + template <> + struct image_traits {typedef short image_type;}; + + template <> + struct image_traits {typedef int image_type;}; + + template <> + struct image_traits {typedef long long image_type;}; + + template <> + struct image_traits {typedef details::buffer image_type;}; + + template <> + struct image_traits {typedef float image_type;}; + + template <> + struct image_traits {typedef double image_type;}; + + // + // value_traits + // + + template + struct default_value_traits; + + template + class value_traits: public default_value_traits + { + }; + + template + struct default_value_traits + { + typedef T value_type; + typedef T query_type; + typedef typename image_traits::image_type image_type; + + static void + set_value (T& v, const image_type& i, bool is_null) + { + if (!is_null) + v = T (i); + else + v = T (); + } + + static void + set_image (image_type& i, bool& is_null, T v) + { + is_null = false; + i = image_type (v); + } + }; + + // std::string specialization. + // + class LIBODB_PGSQL_EXPORT string_value_traits + { + public: + typedef std::string value_type; + typedef std::string query_type; + typedef details::buffer image_type; + + static void + set_value (std::string& v, + const details::buffer& b, + std::size_t n, + bool is_null) + { + if (!is_null) + v.assign (b.data (), n); + else + v.erase (); + } + + static void + set_image (details::buffer&, + std::size_t& n, + bool& is_null, + const std::string&); + }; + + template <> + struct LIBODB_PGSQL_EXPORT default_value_traits: + string_value_traits + { + }; + + template <> + struct LIBODB_PGSQL_EXPORT default_value_traits: + string_value_traits + { + }; + + // const char* specialization + // + // Specialization for const char* which only supports initialization + // of an image from the value but not the other way around. This way + // we can pass such values to the queries. + // + class LIBODB_PGSQL_EXPORT c_string_value_traits + { + public: + typedef const char* value_type; + typedef const char* query_type; + typedef details::buffer image_type; + + static void + set_image (details::buffer&, + std::size_t& n, + bool& is_null, + const char*); + }; + + template <> + struct LIBODB_PGSQL_EXPORT default_value_traits: + c_string_value_traits + { + }; + + template <> + struct LIBODB_PGSQL_EXPORT default_value_traits: + c_string_value_traits + { + }; + + // + // type_traits + // + + template + struct default_type_traits; + + template + class type_traits: public default_type_traits + { + }; + + // Integral types. + // + template <> + struct default_type_traits + { + static const database_type_id db_type_id = id_boolean; + }; + + template <> + struct default_type_traits + { + static const database_type_id db_type_id = id_smallint; + }; + + template <> + struct default_type_traits + { + static const database_type_id db_type_id = id_smallint; + }; + + template <> + struct default_type_traits + { + static const database_type_id db_type_id = id_smallint; + }; + + template <> + struct default_type_traits + { + static const database_type_id db_type_id = id_integer; + }; + + template <> + struct default_type_traits + { + static const database_type_id db_type_id = id_integer; + }; + + template <> + struct default_type_traits + { + static const database_type_id db_type_id = id_bigint; + }; + + template <> + struct default_type_traits + { + static const database_type_id db_type_id = id_bigint; + }; + + template <> + struct default_type_traits + { + static const database_type_id db_type_id = id_bigint; + }; + + template <> + struct default_type_traits + { + static const database_type_id db_type_id = id_bigint; + }; + + // @@ No representation for an unsigned 64 bit value. + // Should we force a compile time error with a message + // or just truncate? + // + // template <> + // struct default_type_traits + // { + // static const database_type_id db_type_id = id_ulonglong; + // }; + + // Float types. + // + template <> + struct default_type_traits + { + static const database_type_id db_type_id = id_real; + }; + + template <> + struct default_type_traits + { + static const database_type_id db_type_id = id_double; + }; + + // String type. + // + template <> + struct default_type_traits + { + static const database_type_id db_type_id = id_string; + }; + + template <> + struct default_type_traits + { + static const database_type_id db_type_id = id_string; + }; + } +} + +#include + +#endif // ODB_PGSQL_TRAITS_HXX -- cgit v1.1