From f221c0a4f291646a1e698a8de2909043e7d0313d Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 14 Jan 2013 18:02:32 +0200
Subject: Fix bug in handling polymorphic derived classes without any value
 members

---
 common/inheritance/polymorphism/driver.cxx | 50 ++++++++++++++++++++++++++++++
 common/inheritance/polymorphism/makefile   |  2 +-
 common/inheritance/polymorphism/test13.hxx | 47 ++++++++++++++++++++++++++++
 3 files changed, 98 insertions(+), 1 deletion(-)
 create mode 100644 common/inheritance/polymorphism/test13.hxx

diff --git a/common/inheritance/polymorphism/driver.cxx b/common/inheritance/polymorphism/driver.cxx
index 20007e4..4f18c15 100644
--- a/common/inheritance/polymorphism/driver.cxx
+++ b/common/inheritance/polymorphism/driver.cxx
@@ -27,6 +27,7 @@
 #include "test10.hxx"
 #include "test11.hxx"
 #include "test12.hxx"
+#include "test13.hxx"
 
 #include "test1-odb.hxx"
 #include "test2-odb.hxx"
@@ -40,6 +41,7 @@
 #include "test10-odb.hxx"
 #include "test11-odb.hxx"
 #include "test12-odb.hxx"
+#include "test13-odb.hxx"
 
 using namespace std;
 using namespace odb::core;
@@ -1871,6 +1873,54 @@ main (int argc, char* argv[])
         assert (*pd == d);
       }
     }
+
+    // Test 13: polymorphic derived without any non-container data members
+    // (which results in an empty SELECT statement).
+    //
+    {
+      using namespace test13;
+
+      base b;
+      b.nums.push_back (123);
+      derived d;
+      d.nums.push_back (123);
+      d.strs.push_back ("abc");
+
+      base1 b1;
+
+      // Persist.
+      //
+      {
+        transaction t (db->begin ());
+        db->persist (b);
+        db->persist (d);
+        db->persist (b1);
+        t.commit ();
+      }
+
+      // Load.
+      //
+      {
+        transaction t (db->begin ());
+        auto_ptr<root> pbr (db->load<root> (b.id));
+        auto_ptr<root> pdr (db->load<root> (d.id));
+        auto_ptr<base> pdb (db->load<base> (d.id));
+        auto_ptr<root> pb1r (db->load<root> (b1.id));
+        t.commit ();
+
+        base& rb (static_cast<base&> (*pbr));
+        derived& rd1 (static_cast<derived&> (*pdr));
+        derived& rd2 (static_cast<derived&> (*pdb));
+        base1 rb1 (static_cast<base1&> (*pb1r));
+
+        assert (rb.id == b.id && rb.nums == b.nums);
+        assert (rd1.id == d.id && rd1.nums == rd1.nums &&
+                rd1.strs == rd1.strs);
+        assert (rd2.id == d.id && rd2.nums == rd2.nums &&
+                rd2.strs == rd2.strs);
+        assert (rb1.id == b1.id);
+      }
+    }
   }
   catch (const odb::exception& e)
   {
diff --git a/common/inheritance/polymorphism/makefile b/common/inheritance/polymorphism/makefile
index ec934f7..744c688 100644
--- a/common/inheritance/polymorphism/makefile
+++ b/common/inheritance/polymorphism/makefile
@@ -6,7 +6,7 @@ include $(dir $(lastword $(MAKEFILE_LIST)))../../../build/bootstrap.make
 
 cxx_tun := driver.cxx
 odb_hdr := test1.hxx test2.hxx test3.hxx test4.hxx test5.hxx test6.hxx \
-test7.hxx test8.hxx test9.hxx test10.hxx test11.hxx test12.hxx
+test7.hxx test8.hxx test9.hxx test10.hxx test11.hxx test12.hxx test13.hxx
 cxx_obj := $(addprefix $(out_base)/,$(cxx_tun:.cxx=.o) $(odb_hdr:.hxx=-odb.o))
 cxx_od  := $(cxx_obj:.o=.o.d)
 
diff --git a/common/inheritance/polymorphism/test13.hxx b/common/inheritance/polymorphism/test13.hxx
new file mode 100644
index 0000000..8f80cdb
--- /dev/null
+++ b/common/inheritance/polymorphism/test13.hxx
@@ -0,0 +1,47 @@
+// file      : common/inheritance/polymorphism/test13.hxx
+// copyright : Copyright (c) 2009-2013 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef TEST13_HXX
+#define TEST13_HXX
+
+#include <string>
+#include <vector>
+
+#include <odb/core.hxx>
+
+// Test polymorphic derived without any non-container data members (which
+// results in an empty SELECT statement).
+//
+#pragma db namespace table("t13_")
+namespace test13
+{
+  #pragma db object polymorphic
+  struct root
+  {
+    virtual ~root () {}
+
+    #pragma db id auto
+    unsigned long id;
+  };
+
+  #pragma db object
+  struct base: root
+  {
+    std::vector<int> nums;
+  };
+
+  #pragma db object
+  struct derived: base
+  {
+    std::vector<std::string> strs;
+  };
+
+  #pragma db object
+  struct base1: root
+  {
+    // Nothing.
+  };
+}
+
+#endif // TEST13_HXX
-- 
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