diff options
author | Boris Kolpackov <boris@codesynthesis.com> | 2012-03-21 08:37:25 +0200 |
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committer | Boris Kolpackov <boris@codesynthesis.com> | 2012-04-23 16:49:43 +0200 |
commit | 290d22210040a7b373e2dc9084240cdeffa1fa3a (patch) | |
tree | 78f090fe5d9da0e4b1d486a39c605c784637b67f /odb/mssql/no-id-object-result.txx | |
parent | c1b8b6f16e4881e57aa0da67e6f09ad71ee6099d (diff) |
Polymorphic inheritance support
Diffstat (limited to 'odb/mssql/no-id-object-result.txx')
-rw-r--r-- | odb/mssql/no-id-object-result.txx | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/odb/mssql/no-id-object-result.txx b/odb/mssql/no-id-object-result.txx new file mode 100644 index 0000000..f3674fb --- /dev/null +++ b/odb/mssql/no-id-object-result.txx @@ -0,0 +1,142 @@ +// file : odb/mssql/no-id-object-result.txx +// copyright : Copyright (c) 2009-2012 Code Synthesis Tools CC +// license : ODB NCUEL; see accompanying LICENSE file + +#include <odb/callback.hxx> +#include <odb/exceptions.hxx> // result_not_cached + +#include <odb/mssql/exceptions.hxx> // long_data_reload +#include <odb/mssql/no-id-object-statements.hxx> + +namespace odb +{ + namespace mssql + { + template <typename T> + no_id_object_result_impl<T>:: + ~no_id_object_result_impl () + { + change_callback_type& cc (statements_.image ().change_callback_); + + if (cc.context == this) + { + cc.context = 0; + cc.callback = 0; + } + + if (!this->end_) + statement_->free_result (); + + delete image_copy_; + } + + template <typename T> + no_id_object_result_impl<T>:: + no_id_object_result_impl (const query&, + details::shared_ptr<select_statement> statement, + statements_type& statements) + : base_type (statements.connection ().database ()), + statement_ (statement), + statements_ (statements), + use_copy_ (false), + image_copy_ (0) + { + } + + template <typename T> + void no_id_object_result_impl<T>:: + load (object_type& obj) + { + if (!can_load_) + throw long_data_reload (); + + odb::database& db (this->database ()); + + object_traits::callback (db, obj, callback_event::pre_load); + + object_traits::init (obj, + use_copy_ ? *image_copy_ : statements_.image (), + &db); + + // If we are using a copy, make sure the callback information for + // long data also comes from the copy. + // + can_load_ = !statement_->stream_result ( + use_copy_ ? &statements_.image () : 0, + use_copy_ ? image_copy_ : 0); + + object_traits::callback (db, obj, callback_event::post_load); + } + + template <typename T> + void no_id_object_result_impl<T>:: + next () + { + can_load_ = true; + this->current (pointer_type ()); + + typename object_traits::image_type& im (statements_.image ()); + change_callback_type& cc (im.change_callback_); + + if (cc.context == this) + { + cc.callback = 0; + cc.context = 0; + } + + use_copy_ = false; + + if (im.version != statements_.select_image_version ()) + { + binding& b (statements_.select_image_binding ()); + object_traits::bind (b.bind, im, statement_select); + statements_.select_image_version (im.version); + b.version++; + } + + if (statement_->fetch () == select_statement::no_data) + { + statement_->free_result (); + this->end_ = true; + } + else + { + cc.callback = &change_callback; + cc.context = this; + } + } + + template <typename T> + void no_id_object_result_impl<T>:: + cache () + { + } + + template <typename T> + std::size_t no_id_object_result_impl<T>:: + size () + { + throw result_not_cached (); + } + + template <typename T> + void no_id_object_result_impl<T>:: + change_callback (void* c) + { + no_id_object_result_impl<T>* r ( + static_cast<no_id_object_result_impl<T>*> (c)); + + typename object_traits::image_type im (r->statements_.image ()); + + if (r->image_copy_ == 0) + r->image_copy_ = new typename object_traits::image_type (im); + else + *r->image_copy_ = im; + + im.change_callback_.callback = 0; + im.change_callback_.context = 0; + + r->use_copy_ = true; + } + } +} |