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Diffstat (limited to 'odb/mssql/view-result.txx')
-rw-r--r-- | odb/mssql/view-result.txx | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/odb/mssql/view-result.txx b/odb/mssql/view-result.txx new file mode 100644 index 0000000..4b5053d --- /dev/null +++ b/odb/mssql/view-result.txx @@ -0,0 +1,131 @@ +// file : odb/mssql/view-result.txx +// author : Constantin Michael <constantin@codesynthesis.com> +// copyright : Copyright (c) 2009-2011 Code Synthesis Tools CC +// license : ODB NCUEL; see accompanying LICENSE file + +#include <odb/callback.hxx> +#include <odb/exceptions.hxx> + +#include <odb/mssql/view-statements.hxx> + +namespace odb +{ + namespace mssql + { + template <typename T> + view_result_impl<T>:: + ~view_result_impl () + { + change_callback_type& cc (statements_.image ().change_callback_); + + if (cc.context == this) + { + cc.callback = 0; + cc.context = 0; + } + + delete image_copy_; + } + + template <typename T> + view_result_impl<T>:: + view_result_impl (const query&, + details::shared_ptr<select_statement> statement, + view_statements<view_type>& statements) + : base_type (statements.connection ().database ()), + statement_ (statement), + statements_ (statements), + use_copy_ (false), + image_copy_ (0) + { + } + + template <typename T> + void view_result_impl<T>:: + load (view_type& view) + { + odb::database& db (this->database ()); + + view_traits::callback (db, view, callback_event::pre_load); + + view_traits::init (view, + 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. + // + statement_->stream_result ( + use_copy_ ? &statements_.image () : 0, + use_copy_ ? image_copy_ : 0); + + view_traits::callback (db, view, callback_event::post_load); + } + + template <typename T> + void view_result_impl<T>:: + next () + { + this->current (pointer_type ()); + + typename view_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_.image_version ()) + { + binding& b (statements_.image_binding ()); + view_traits::bind (b.bind, im); + statements_.image_version (im.version); + b.version++; + } + + if (statement_->fetch () == select_statement::no_data) + this->end_ = true; + else + { + cc.callback = &change_callback; + cc.context = this; + } + } + + template <typename T> + void view_result_impl<T>:: + cache () + { + } + + template <typename T> + std::size_t view_result_impl<T>:: + size () + { + throw result_not_cached (); + } + + template <typename T> + void view_result_impl<T>:: + change_callback (void* c) + { + view_result_impl<T>* r (static_cast<view_result_impl<T>*> (c)); + + typename view_traits::image_type& im (r->statements_.image ()); + + if (r->image_copy_ == 0) + r->image_copy_ = new typename view_traits::image_type (im); + else + *r->image_copy_ = im; + + im.change_callback_.callback = 0; + im.change_callback_.context = 0; + + r->use_copy_ = true; + } + } +} |