From 42503207920b9264e04c97cb6a5c53214fd2eff8 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 23 Apr 2012 16:48:01 +0200
Subject: Polymorphic inheritance support

---
 odb/mysql/no-id-object-result.txx | 158 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 158 insertions(+)
 create mode 100644 odb/mysql/no-id-object-result.txx

(limited to 'odb/mysql/no-id-object-result.txx')

diff --git a/odb/mysql/no-id-object-result.txx b/odb/mysql/no-id-object-result.txx
new file mode 100644
index 0000000..864b49d
--- /dev/null
+++ b/odb/mysql/no-id-object-result.txx
@@ -0,0 +1,158 @@
+// file      : odb/mysql/no-id-object-result.txx
+// copyright : Copyright (c) 2009-2012 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#include <odb/callback.hxx>
+#include <odb/exceptions.hxx> // result_not_cached
+
+#include <odb/mysql/no-id-object-statements.hxx>
+
+namespace odb
+{
+  namespace mysql
+  {
+    template <typename T>
+    no_id_object_result_impl<T>::
+    ~no_id_object_result_impl ()
+    {
+      if (!this->end_)
+        statement_->free_result ();
+    }
+
+    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),
+          count_ (0)
+    {
+    }
+
+    template <typename T>
+    void no_id_object_result_impl<T>::
+    load (object_type& obj)
+    {
+      if (count_ > statement_->fetched ())
+        fetch ();
+
+      odb::database& db (this->database ());
+
+      object_traits::callback (db, obj, callback_event::pre_load);
+      object_traits::init (obj, statements_.image (), &db);
+      object_traits::callback (db, obj, callback_event::post_load);
+    }
+
+    template <typename T>
+    void no_id_object_result_impl<T>::
+    next ()
+    {
+      this->current (pointer_type ());
+
+      // If we are cached, simply increment the position and
+      // postpone the actual row fetching until later. This way
+      // if the same object is loaded in between iteration, the
+      // image won't be messed up.
+      //
+      count_++;
+
+      if (statement_->cached ())
+        this->end_ = count_ > statement_->result_size ();
+      else
+        fetch ();
+
+      if (this->end_)
+        statement_->free_result ();
+    }
+
+    template <typename T>
+    void no_id_object_result_impl<T>::
+    fetch ()
+    {
+      // If the result is cached, the image can grow between calls
+      // to fetch() as a result of other statements execution.
+      //
+      if (statement_->cached ())
+      {
+        typename object_traits::image_type& im (statements_.image ());
+
+        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++;
+        }
+      }
+
+      while (!this->end_ && count_ > statement_->fetched ())
+      {
+        select_statement::result r (statement_->fetch ());
+
+        switch (r)
+        {
+        case select_statement::truncated:
+          {
+            // Don't re-fetch data we are skipping.
+            //
+            if (count_ != statement_->fetched ())
+              continue;
+
+            typename object_traits::image_type& im (statements_.image ());
+
+            if (object_traits::grow (
+                  im, statements_.select_image_truncated ()))
+              im.version++;
+
+            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++;
+              statement_->refetch ();
+            }
+            // Fall throught.
+          }
+        case select_statement::success:
+          {
+            break;
+          }
+        case select_statement::no_data:
+          {
+            this->end_ = true;
+            break;
+          }
+        }
+      }
+    }
+
+    template <typename T>
+    void no_id_object_result_impl<T>::
+    cache ()
+    {
+      if (!statement_->cached ())
+      {
+        statement_->cache ();
+
+        if (count_ >= statement_->result_size ())
+        {
+          statement_->free_result ();
+          this->end_ = true;
+        }
+      }
+    }
+
+    template <typename T>
+    std::size_t no_id_object_result_impl<T>::
+    size ()
+    {
+      if (!statement_->cached ())
+        throw result_not_cached ();
+
+      return statement_->result_size ();
+    }
+  }
+}
-- 
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