From 59e3ebcafb1dc4d54484143fc926ef8377bdb154 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 26 Nov 2014 15:04:56 +0200
Subject: Implement optimistic concurrency support in bulk operations

Bulk update and SQL Server ROWVERSION not yet supported.
---
 common/bulk/driver.cxx | 190 +++++++++++++++++++++++++++++++++++++++++++++++++
 common/bulk/test.hxx   |  48 ++++++++++++-
 common/bulk/test.std   |   8 +++
 3 files changed, 245 insertions(+), 1 deletion(-)

diff --git a/common/bulk/driver.cxx b/common/bulk/driver.cxx
index 2903ae4..7d0b726 100644
--- a/common/bulk/driver.cxx
+++ b/common/bulk/driver.cxx
@@ -1015,6 +1015,196 @@ main (int argc, char* argv[])
       }
     }
 
+    // Test optimistic concurrency.
+    //
+    {
+      using namespace test7;
+
+      std::vector<object> v (fill<object> (4));
+
+      // persist
+      //
+      {
+        transaction t (db->begin ());
+        db->persist (v.begin (), v.end ());
+        t.commit ();
+
+        assert (v[0].v != 0 &&
+                v[1].v != 0 &&
+                v[2].v != 0 &&
+                v[3].v != 0);
+      }
+
+      // update
+      //
+      {
+        std::vector<object> c (v);
+
+        transaction t (db->begin ());
+        db->update (v.begin (), v.end ());
+        t.commit ();
+
+        assert (v[0].v > c[0].v &&
+                v[1].v > c[1].v &&
+                v[2].v > c[2].v &&
+                v[3].v > c[3].v);
+      }
+
+      {
+        object o2 (v[1]);
+        object o4 (v[3]);
+
+        o2.n++;
+        o4.n++;
+
+        transaction t (db->begin ());
+        db->update (o2);
+        db->update (o4);
+        t.commit ();
+      }
+
+      try
+      {
+        transaction t (db->begin ());
+        db->update (v.begin (), v.end ());
+        assert (false);
+      }
+      catch (const multiple_exceptions& e)
+      {
+        cout << e.what () << endl << endl;
+      }
+
+      // erase
+      //
+      try
+      {
+        transaction t (db->begin ());
+        db->erase (v.begin (), v.end ());
+        assert (false);
+      }
+      catch (const multiple_exceptions& e)
+      {
+        cout << e.what () << endl << endl;
+      }
+
+      {
+        transaction t (db->begin ());
+        db->reload (v[1]);
+        db->reload (v[3]);
+        t.commit ();
+      }
+
+      {
+        transaction t (db->begin ());
+        db->erase (v.begin (), v.end ());
+        t.commit ();
+      }
+    }
+
+    // Test SQL Server optimistic concurrency with ROWVERSION.
+    //
+#ifdef DATABASE_MSSQL
+    {
+      using namespace test8;
+
+      std::vector<object> v (fill<object> (4));
+
+      v[0].id = 1;
+      v[2].id = 2;
+      v[3].id = 3;
+      v[4].id = 4;
+
+
+      // persist
+      //
+      {
+        transaction t (db->begin ());
+        db->persist (v.begin (), v.end ());
+        t.commit ();
+
+        assert (v[0].v != 0 &&
+                v[1].v != 0 &&
+                v[2].v != 0 &&
+                v[3].v != 0);
+
+        //cerr << v[0].v << endl
+        //     << v[0].v << endl
+        //     << v[0].v << endl
+        //     << v[0].v << endl;
+      }
+
+      // update
+      //
+
+      /*
+      {
+        std::vector<object> c (v);
+
+        transaction t (db->begin ());
+        db->update (v.begin (), v.end ());
+        t.commit ();
+
+        assert (v[0].v > c[0].v &&
+                v[1].v > c[1].v &&
+                v[2].v > c[2].v &&
+                v[3].v > c[3].v);
+      }
+      */
+
+      {
+        object o2 (v[1]);
+        object o4 (v[3]);
+
+        o2.n++;
+        o4.n++;
+
+        transaction t (db->begin ());
+        db->update (o2);
+        db->update (o4);
+        t.commit ();
+      }
+
+      /*
+      try
+      {
+        transaction t (db->begin ());
+        db->update (v.begin (), v.end ());
+        assert (false);
+      }
+      catch (const multiple_exceptions& e)
+      {
+        cout << e.what () << endl << endl;
+      }
+      */
+
+      // erase
+      //
+      try
+      {
+        transaction t (db->begin ());
+        db->erase (v.begin (), v.end ());
+        assert (false);
+      }
+      catch (const multiple_exceptions& e)
+      {
+        assert (e.attempted () == 4 && e.failed () == 4);
+      }
+
+      {
+        transaction t (db->begin ());
+        db->reload (v[1]);
+        db->reload (v[3]);
+        t.commit ();
+      }
+
+      {
+        transaction t (db->begin ());
+        db->erase (v.begin (), v.end ());
+        t.commit ();
+      }
+    }
+#endif
+
 #endif
   }
   catch (const odb::exception& e)
diff --git a/common/bulk/test.hxx b/common/bulk/test.hxx
index 526762f..c0955f1 100644
--- a/common/bulk/test.hxx
+++ b/common/bulk/test.hxx
@@ -5,7 +5,7 @@
 #ifndef TEST_HXX
 #define TEST_HXX
 
-#include <common/config.hxx> // HAVE_CXX11
+#include <common/config.hxx> // HAVE_CXX11, DATABASE_*
 
 #include <string>
 #include <memory> // std::auto_ptr, std::unique_ptr
@@ -189,4 +189,50 @@ namespace test6
 #endif
 }
 
+// Test optimistic concurrency.
+//
+#pragma db namespace table("t7_")
+namespace test7
+{
+  #pragma db object optimistic bulk(3)
+  struct object
+  {
+    object (unsigned int n_ = 0, std::string s_ = "")
+        : id (0), v (0), n (n_), s (s_) {}
+
+    #pragma db id auto
+    unsigned long long id;
+
+    #pragma db version
+    unsigned long long v;
+
+    unsigned int n;
+    std::string s;
+  };
+}
+
+// Test SQL Server optimistic concurrency with ROWVERSION.
+//
+#ifdef DATABASE_MSSQL
+#pragma db namespace table("t8_")
+namespace test8
+{
+  #pragma db object optimistic bulk(3)
+  struct object
+  {
+    object (unsigned int n_ = 0, std::string s_ = "")
+        : id (0), v (0), n (n_), s (s_) {}
+
+    #pragma db id
+    unsigned long long id;
+
+    #pragma db version type("ROWVERSION")
+    unsigned long long v;
+
+    unsigned int n;
+    std::string s;
+  };
+}
+#endif
+
 #endif // TEST_HXX
diff --git a/common/bulk/test.std b/common/bulk/test.std
index 6c4bdf9..e72869d 100644
--- a/common/bulk/test.std
+++ b/common/bulk/test.std
@@ -216,3 +216,11 @@ multiple exceptions, 10 elements attempted, 6 failed:
 multiple exceptions, 3 elements attempted, 3 failed:
 [0-2] (some) object not persistent
 
+multiple exceptions, 4 elements attempted, 4 failed:
+[0-2] (some) object changed concurrently
+[3] object changed concurrently
+
+multiple exceptions, 4 elements attempted, 4 failed:
+[0-2] (some) object changed concurrently
+[3] object changed concurrently
+
-- 
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