Add support for recursive object loading

If an object of a type needs to be loaded recursively, then it is addded to
the delayed loading list which is processed once the statements are unlocked.

1 files changed, 54 insertions, 0 deletions

diff --git a/odb/mysql/object-statements.ixx b/odb/mysql/object-statements.ixx
new file mode 100644
index 0000000..891499b
--- /dev/null
+++ b/odb/mysql/object-statements.ixx
@@ -0,0 +1,54 @@
+// file      : odb/mysql/object-statements.ixx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2005-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+namespace odb
+{
+  namespace mysql
+  {
+    //
+    // auto_lock
+    //
+    template <typename T>
+    inline object_statements<T>::auto_lock::
+    auto_lock (object_statements& s)
+        : s_ (s)
+    {
+      if (!s_.locked ())
+      {
+        s_.lock ();
+        locked_ = true;
+      }
+      else
+        locked_ = false;
+    }
+
+    template <typename T>
+    inline object_statements<T>::auto_lock::
+    ~auto_lock ()
+    {
+      if (locked_)
+      {
+        s_.unlock ();
+        s_.clear_delayed ();
+      }
+    }
+
+    template <typename T>
+    inline bool object_statements<T>::auto_lock::
+    locked () const
+    {
+      return locked_;
+    }
+
+    template <typename T>
+    inline void object_statements<T>::auto_lock::
+    unlock ()
+    {
+      assert (locked_);
+      s_.unlock ();
+      locked_ = false;
+    }
+  }
+}