Query support for SQL Server

1 files changed, 131 insertions, 0 deletions

diff --git a/odb/mssql/view-result.txx b/odb/mssql/view-result.txx
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+// 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;
+    }
+  }
+}