Fix like escaping for DB2, Oracle and MySql (#1162)

* Extended test case to show problem

* FIX: Proper escaping of backslash in like/contains queries

* Had to replace "like ?" assertions in tests with "like " as mysql will do a "like binary ? escape'|'" now to be case sensitive

src/test/java/org/tests/query/other/TestQuerySingleAttribute.java

@@ -112,7 +112,7 @@ public class TestQuerySingleAttribute extends BaseTestCase {
 
     List<String> names = query.findSingleAttributeList();
 
-    assertThat(sqlOf(query)).contains("select distinct t0.name from o_customer t0 left join o_address t1 on t1.id = t0.billing_address_id  where t0.status = ?  and lower(t1.city) like ?");
+    assertThat(sqlOf(query)).contains("select distinct t0.name from o_customer t0 left join o_address t1 on t1.id = t0.billing_address_id  where t0.status = ?  and lower(t1.city) like ");
     assertThat(names).isNotNull();
   }