Add SetFlushMode to QueryOver

Author: fredericDelaporte

src/NHibernate.Test/Criteria/Lambda/QueryOverFixture.cs

@@ -965,6 +965,19 @@ public void SetComment()
 			AssertCriteriaAreEqual(expected, actual);
 		}
 
+		[Test]
+		public void SetFlushMode(
+			[Values(FlushMode.Always, FlushMode.Auto, FlushMode.Commit, FlushMode.Manual)] FlushMode flushMode)
+		{
+			var expected =
+				CreateTestCriteria(typeof(Person))
+					.SetFlushMode(flushMode);
+			var actual =
+				CreateTestQueryOver<Person>()
+					.SetFlushMode(flushMode);
+			AssertCriteriaAreEqual(expected, actual);
+		}
+
 		[Test]
 		public void DetachedQueryOver()
 		{

src/NHibernate/QueryOverExtensions.cs

@@ -39,5 +39,17 @@ public static TQueryOver SetComment<TQueryOver>(this TQueryOver queryOver, strin
 			queryOver.RootCriteria.SetComment(comment);
 			return queryOver;
 		}
+
+		/// <summary>
+		/// Override the current session flush mode, just for this query.
+		/// </summary>
+		/// <param name="queryOver">The query on which to set the flush mode.</param>
+		/// <param name="flushMode">The flush mode to use for the query.</param>
+		/// <returns><see langword="this" /> (for method chaining).</returns>
+		public static TQueryOver SetFlushMode<TQueryOver>(this TQueryOver queryOver, FlushMode flushMode) where TQueryOver: IQueryOver
+		{
+			queryOver.RootCriteria.SetFlushMode(flushMode);
+			return queryOver;
+		}
 	}
 }