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POGroup by in JPA
 

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    <p>My Question is why the <code>GROUP BY</code> didn't show in the glassfish logs. i added the following data below because someone wants to see it </p> <pre><code> public List&lt;Message&gt; listAllMessageBySender(String currentUserID) { EntityManagerFactory emf = Persistence.createEntityManagerFactory("PersistenceUnit"); EntityManager entityManager = emf.createEntityManager(); TypedQuery&lt;Message&gt; eq = entityManager.createQuery("SELECT m FROM Message m WHERE m.sendBy.userId = :userid GROUP BY m.sendTo.userId", Message.class); eq.setParameter("userid", Integer.parseInt(currentUserID)); List&lt;Message&gt; message = eq.getResultList(); return message; } </code></pre> <p>Glassfish 3.1.2.Logs</p> <pre><code>FINE: SELECT id, message, send_date, send_by, send_to FROM message WHERE (send_by = ?) bind =&gt; [50] Data: User A : sendBy.userId = 50 User B : sendTo.userId = 44 User C : sendTo.userId = 43 id send_date send_by send_to message 1 2013-03-14 14:58:46 44 50 50 send message to 44 2 2013-03-14 14:58:46 50 44 reply from 44 to 50 3 2013-03-14 17:38:52 44 50 2nd reply to 50 6 2013-03-14 18:22:10 50 44 44 reply to 50 7 2013-03-14 18:22:10 50 43 new in the query above is i want to list all the user sent from User A. it causes duplication because there is two send_to 44. the xhtml below shows : &lt;ui:repeat value="#{messageController.items}" var="messageItem"&gt; &lt;br /&gt; &lt;div onclick="loadMessage()"&gt; &lt;h:panelGroup layout="block" &gt; &lt;p:graphicImage height="50" width="50" value="#{messageItem.sendTo.profilePicture}"/&gt; &lt;/h:panelGroup&gt; &lt;h:panelGroup layout="block" style="width: 270px;"&gt; &lt;h:outputText value="#{messageItem.sendTo.registerName}"/&gt; &lt;h:panelGroup layout="block" style="float:right;"&gt; &lt;h:outputText value="#{messageItem.sendDate}" &gt; &lt;f:convertDateTime pattern="HH:mm"/&gt; &lt;/h:outputText&gt; &lt;/h:panelGroup&gt; &lt;/h:panelGroup&gt; &lt;/div&gt; &lt;p:remoteCommand name="loadMessageBean" action="#{messageController.loadMessage(messageItem.id)}" /&gt; &lt;/ui:repeat&gt; ERD User Table Message Table user_id message_id register_name send_date send_to ----&gt; referenced by user_id User Table send_by ----&gt; referenced by user_id User Table </code></pre>
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    1. COSorry, but it's still unclear. If you want to list all the messages sent by user 50, and user 50 has sent two messages to user 44, then obviously these two messages should be retrieved by the query. If you want to get all the distinct users whom the user 50 sent a message to, then it's possible, but printing the message date doesn't make sense, since obviously, the messages from user 50 to user 44 (for example) will have several different dates.
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    2. COactually it has a user table that links to the message what i want to display is not just the message but also the user . ahm ignore the send_date for now . i will edit again the question to display the ERD
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    3. COSee the edit to my answer.
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