MVTableEngine: support MVCC (work in progress)

h2/src/main/org/h2/engine/Session.java

@@ -468,6 +468,17 @@ public class Session extends SessionWithState {
         currentTransactionName = null;
         transactionStart = 0;
         if (transaction != null) {
+            // increment the data mod count, so that other sessions
+            // see the changes
+            // TODO should not rely on locking
+            if (locks.size() > 0) {
+                for (int i = 0, size = locks.size(); i < size; i++) {
+                    Table t = locks.get(i);
+                    if (t instanceof MVTable) {
+                        ((MVTable) t).commit();
+                    }
+                }
+            }
             transaction.commit();
             transaction = null;
         }

h2/src/main/org/h2/mvstore/db/MVTable.java

@@ -700,4 +700,10 @@ public class MVTable extends TableBase {
         return true;
     }
 
+    public void commit() {
+        if (database != null) {
+            lastModificationId = database.getNextModificationDataId();
+        }
+    }
+
 }

h2/src/test/org/h2/test/mvcc/TestMvcc3.java

@@ -63,7 +63,6 @@ public class TestMvcc3 extends TestBase {
             // expected
         }
 
-
         ResultSet rs = s1.executeQuery("select * from test order by id");
         assertTrue(rs.next());
         assertEquals(1, rs.getInt(1));