diff --git a/src/main/resources/Group.hbm.xml b/src/main/resources/Group.hbm.xml
index 8e0333c..aac9a9b 100644
--- a/src/main/resources/Group.hbm.xml
+++ b/src/main/resources/Group.hbm.xml
@@ -14,7 +14,6 @@
 
     <class name="Group" table="GROUPS">
         <id name="gId" column="GID">
-            <generator class="increment"/>
         </id>
         <property name="uri" column="URI"/>
         <property name="name" column="NAME"/>
diff --git a/src/main/resources/Request.hbm.xml b/src/main/resources/Request.hbm.xml
index 4adea89..b08773b 100644
--- a/src/main/resources/Request.hbm.xml
+++ b/src/main/resources/Request.hbm.xml
@@ -14,7 +14,6 @@
 
     <class name="Request" table="REQUEST">
         <id name="rId" column="RID">
-            <generator class="increment"/>
         </id>
         <property name="uri" column="URI"/>
         <property name="date" column="DATE"/>
diff --git a/src/test/java/hibernateTest/models/NativeApiIllustrationTest.java b/src/test/java/hibernateTest/models/NativeApiIllustrationTest.java
index c9c97c3..1576d8e 100644
--- a/src/test/java/hibernateTest/models/NativeApiIllustrationTest.java
+++ b/src/test/java/hibernateTest/models/NativeApiIllustrationTest.java
@@ -29,6 +29,8 @@
 import hibernateTest.entities.Event;
 import hibernateTest.entities.Group;
 import hibernateTest.entities.Request;
+import org.hibernate.Criteria;
+import org.hibernate.criterion.Restrictions;
 import org.hibernate.Session;
 import org.hibernate.SessionFactory;
 import org.hibernate.boot.MetadataSources;
@@ -76,17 +78,30 @@
 		session.beginTransaction();
 		session.save( new Event( "Our very first event!", new Date() ) );
 		session.save( new Event( "A follow up event", new Date() ) );
-		session.save( new Group("111", "http://test1", "famiry", "011" ) );
+		session.save( new Group("111", "http://test1", "family", "011" ) );
 		session.save( new Group("222", "http://test2", "friend", "022" ) );
 		session.save( new Request("111", "http://test01", "1999.01.01", "011", "ice", "1999.04.10",011));
-		session.save( new Request("222", "http://test01", "1999.01.01", "022", "milk", "1999.04.10",011));
+		session.save( new Request("222", "http://test02", "1999.02.02", "033", "milk", "1999.04.10",011));
+		session.save( new Request("333", "http://test03", "1999.03.03", "033", "ice", "1999.04.10",011));
+		session.getTransaction().commit();
+		session.close();
+
+		// read and delete a request
+		session = sessionFactory.openSession();
+		session.beginTransaction();
+		//http://a4dosanddos.hatenablog.com/entry/2015/03/21/135421
+		//createCriteriaは非推奨。別の方法があるのか?
+		Criteria criteria = session.createCriteria(Request.class).add(Restrictions.eq("rId", (long)222));
+		Request editRequest = (Request) criteria.uniqueResult();
+		if(editRequest != null){
+			session.delete(editRequest);
+		}
 		session.getTransaction().commit();
 		session.close();
 
 		// now lets pull events from the database and list them
 		session = sessionFactory.openSession();
 		session.beginTransaction();
-
 		List result = session.createQuery( "from Event" ).list();
 		for ( Event event : (List<Event>) result ) {
 			System.out.println( "Event (" + event.getDate() + ") : " + event.getTitle() );
@@ -99,7 +114,6 @@
 		for ( Request request : (List<Request>) requestResult ) {
 			System.out.println( "Request (" + request.getrId() + ") : " + request.getUri() + ": " + request.getDate() + ": " + request.isDone());
 		}
-
 		session.getTransaction().commit();
 		session.close();
 	}
diff --git a/src/test/resources/Event.hbm.xml b/src/test/resources/Event.hbm.xml
index bceae94..047e592 100644
--- a/src/test/resources/Event.hbm.xml
+++ b/src/test/resources/Event.hbm.xml
@@ -14,7 +14,7 @@
 
     <class name="Event" table="EVENTS">
         <id name="id" column="EVENT_ID">
-            <generator class="increment"/>
+            <generator class="increment"/> <!--こいつを外すことで、idの指定が可能。-->
         </id>
         <property name="date" type="timestamp" column="EVENT_DATE"/>
         <property name="title"/>
diff --git a/src/test/resources/Group.hbm.xml b/src/test/resources/Group.hbm.xml
index 4576193..7a4a298 100644
--- a/src/test/resources/Group.hbm.xml
+++ b/src/test/resources/Group.hbm.xml
@@ -14,7 +14,6 @@
 
     <class name="Group" table="GROUPS">
         <id name="gId" column="GID">
-            <generator class="increment"/>
         </id>
         <property name="uri" column="URI"/>
         <property name="name" column="NAME"/>
diff --git a/src/test/resources/Request.hbm.xml b/src/test/resources/Request.hbm.xml
index 4184b20..d41866b 100644
--- a/src/test/resources/Request.hbm.xml
+++ b/src/test/resources/Request.hbm.xml
@@ -14,7 +14,6 @@
 
     <class name="Request" table="REQUEST">
         <id name="rId" column="RID">
-            <generator class="increment"/>
         </id>
         <property name="uri" column="URI"/>
         <property name="date" column="DATE"/>