implemented and added test cases for DB dao. Added dependency of Hierarchical junit runner in parent pom

dao/pom.xml

@@ -44,6 +44,14 @@
       <groupId>log4j</groupId>
       <artifactId>log4j</artifactId>
     </dependency>
+    <dependency>
+        <groupId>com.h2database</groupId>
+        <artifactId>h2</artifactId>
+      </dependency>
+    <dependency>
+      <groupId>de.bechte.junit</groupId>
+      <artifactId>junit-hierarchicalcontextrunner</artifactId>
+    </dependency>
   </dependencies>
 
   <build>