aggiunto mapping relazione, entity manager da container, listener, callbacks, query

servlet/Servlettest3.java

@@ -22,7 +22,9 @@ import javax.validation.executable.ExecutableValidator;
 import java.io.IOException;
 import java.io.PrintWriter;
 import java.lang.reflect.Method;
+import java.util.HashMap;
 import java.util.Iterator;
+import java.util.List;
 import java.util.Set;
 
 /**
@@ -50,7 +52,71 @@ public class Servlettest3 extends HttpServlet {
             out.println("<h1>Servlet xg at " + request.getContextPath() + "</h1>");
 
 
-            s.store_class(new test_class() );
+            s.store_class(new test_class());
+            out.println(s.find(1L).getTitle());
+            //s.fake_remove(1L);
+            s.remove_and_persist(1L);
+
+            test_class t = s.find(1L);
+            t.setTitle("alibaa");
+            out.println(s.find(1L).getTitle()); // database isn't updated
+            out.println(s.contains(s.find(1L))); // it's false
+            s.merge(t);
+            out.println(s.find(1L).getTitle());// database is updated! All OK!
+
+            //test_class q = (test_class) s.namedquery_single("findtest_class") ;
+            //out.println(q.getTitle());
+
+            /*
+            List<Object> q = s.namedquery_multiple("findtest_class") ;
+            Iterator<Object> it = q.iterator();
+            while (it.hasNext()){
+                out.println(((test_class) it.next()).getTitle());
+            }
+
+            */
+            out.println("<br>");
+
+            List<Object> q2 = s.dynquery_multiple("SELECT t FROM test_class t") ;
+            Iterator<Object> it = q2.iterator();
+            while (it.hasNext()){
+                out.println(((test_class) it.next()).getTitle());
+            }
+
+            out.println("<br>");
+
+            HashMap<String,String> h = new HashMap<String,String>();
+            h.put("fname", "alibaa");
+            // h.put(...);
+            List<Object> q3 = s.dynquery_multiple_string("SELECT t FROM test_class t where t.title = :fname", h) ;
+            Iterator<Object> it2 = q3.iterator();
+            while (it2.hasNext()){
+                out.println(((test_class) it2.next()).getTitle());
+            }
+
+            out.println("<br>");
+
+            HashMap<Integer,String> h2 = new HashMap<Integer,String>();
+            h2.put(1,"alibaa");
+            // h2.put(...);
+            List<Object> q4 = s.dynquery_multiple_integer("SELECT t FROM test_class t where t.title = ?1", h2) ;
+            Iterator<Object> it3 = q4.iterator();
+            while (it3.hasNext()){
+                out.println(((test_class) it3.next()).getTitle());
+            }
+
+
+
+
+
+
+
+
+
+
+
+
+
 
 
 

test1_cdi/GeneralInterceptor.java

@@ -5,14 +5,14 @@ package test1_cdi;
  */
 
 import javax.annotation.PostConstruct;
-//import javax.annotation.Priority;
+import javax.annotation.Priority;
 import javax.inject.Inject;
 import javax.interceptor.*;
 import java.util.logging.Logger;
 
 @Interceptor
 @GeneralInterceptorA
-//@Priority(200)
+@Priority(200)
 
 public class GeneralInterceptor {
 

test3_persistence/Persistent_Listener1.java

@@ -0,0 +1,30 @@
+package test3_persistence;
+
+import javax.inject.Inject;
+import javax.persistence.PostLoad;
+import javax.persistence.PostPersist;
+import javax.persistence.PostUpdate;
+import java.util.logging.Logger;
+
+/**
+ * Created by Giovanni on 10/05/2015.
+ */
+public class Persistent_Listener1 {
+
+    // @Inject not working
+    Logger l = Logger.getLogger("xg");
+
+
+    @PostLoad
+    @PostPersist
+    @PostUpdate
+
+    public void method1 (Object entity) {
+
+        l.info("persistence listener : postload, postpersist,postupdate");
+
+    }
+
+
+
+}

test3_persistence/Persistent_Listener2.java

@@ -0,0 +1,27 @@
+package test3_persistence;
+
+import javax.inject.Inject;
+import javax.persistence.*;
+import java.util.logging.Logger;
+
+/**
+ * Created by Giovanni on 10/05/2015.
+ */
+public class Persistent_Listener2 {
+
+    // @Inject not working
+    Logger l = Logger.getLogger("xg");
+
+
+    @PrePersist
+    @PreUpdate
+
+    public void method1 (Object entity) {
+
+        l.info("persistence listener 2 : PrePersist, PreUpdate");
+
+    }
+
+
+
+}

test3_persistence/store_class.java

@@ -2,8 +2,14 @@ package test3_persistence;
 
 import javax.ejb.Stateless;
 import javax.inject.Inject;
+import javax.persistence.Query;
 import javax.persistence.EntityManager;
 import javax.persistence.PersistenceContext;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Set;
+import java.util.logging.Logger;
 
 /**
  * Created by Giovanni on 04/05/2015.
@@ -12,6 +18,9 @@ import javax.persistence.PersistenceContext;
 @Stateless
 public class store_class {
 
+    @Inject
+    Logger l;
+
     @PersistenceContext(unitName = "test3")
     private EntityManager em;
 
@@ -22,6 +31,80 @@ public class store_class {
 
     }
 
+    public test_class find (Long n){
+        //return em.find(test_class.class,n); // null if fail
+        //or
+        return em.getReference(test_class.class, n); // EntityNotFoundException if fail
+    }
+
+
+    public void fake_remove (Long n){
+
+        test_class t = find(n);
+        t.setXlist(null); // works because orphanremoval is true
+
+    }
+
+    public void remove_and_persist (Long n){
+        test_class t = find(n);
+        em.remove(t); // delete t object and connected objects because cascading is set to CascadeType.ALL
+        em.persist(t); // persist work, objects are in memory, all is safe again
+    }
+
+    public boolean contains (test_class t){
+        return em.contains(t);
+    }
+
+    public void merge (test_class t){
+        //em.persist(t); error, object already present in database
+        em.merge(t);
+    }
+
+
+    public Object  namedquery_single (String q){
+        Query Q = em.createNamedQuery(q);
+        return Q.getSingleResult(); // if no result NoResultException
+                                    // if more NonUniqueResultException
+    }
+
+    public List<Object> namedquery_multiple (String q){
+        Query Q = em.createNamedQuery(q);
+        return Q.getResultList(); // if no result NoResultException
+
+    }
+
+    public List<Object> dynquery_multiple (String q){
+        Query Q = em.createQuery(q);
+        return Q.getResultList(); // if no result NoResultException
+
+    }
+
+    public List<Object> dynquery_multiple_string (String q, HashMap<String,String> h){
+        Query Q = em.createQuery(q);
+        Iterator<String> it =  h.keySet().iterator();
+        while (it.hasNext()){
+            String next = it.next();
+            l.info(next);
+            l.info(h.get(next));
+            Q.setParameter(next,h.get(next));
+        }
+        return Q.getResultList(); // if no result NoResultException
+
+    }
+
+
+    public List<Object> dynquery_multiple_integer (String q, HashMap<Integer,String> h){
+        Query Q = em.createQuery(q);
+        Iterator<Integer> it =  h.keySet().iterator();
+        while (it.hasNext()){
+            Integer next = it.next();
+            l.info(next.toString());
+            l.info(h.get(next));
+            Q.setParameter(next,h.get(next));
+        }
+        return Q.getResultList(); // if no result NoResultException
+
+    }
 
 
 

test3_persistence/test_class.java

@@ -1,28 +1,46 @@
 package test3_persistence;
 
 
+import test1_cdi.GeneralInterceptorA;
+
 import javax.annotation.PostConstruct;
-import javax.persistence.Entity;
-import javax.persistence.GeneratedValue;
-import javax.persistence.Id;
-import javax.persistence.NamedQuery;
+import javax.persistence.*;
+import javax.validation.constraints.NotNull;
+import java.util.ArrayList;
+import java.util.List;
 
 @Entity
-@NamedQuery(name = "findxg", query = "SELECT b FROM test_class b WHERE b.title ='xg'")
+@NamedQueries({
+        @NamedQuery(name = "findtest_class", query = "SELECT b FROM test_class b WHERE b.title ='test_class'"),
+        @NamedQuery(name = "findxgio", query = "SELECT b FROM test_class b WHERE b.title ='xgio'"),
+        @NamedQuery(name = "findxg", query = "SELECT b FROM test_class b WHERE b.title ='xg'")
+})
+@EntityListeners({Persistent_Listener1.class,Persistent_Listener2.class})
+
 public class test_class {
 
         @Id @GeneratedValue
         private Long id;
 
-        @PostConstruct
-        public void ps (){
-                title = "xg";
+
+        public test_class (){
+                title = "test_class";
+                xlist = new ArrayList<test_class_2>();
+                xlist.add(new test_class_2());
+                xlist.get(0).setT(this);
+                xlist.add(new test_class_2());
+                xlist.get(1).setT(this);
+
         }
 
         private String title;
 
+        //@NotNull
         private Double price;
 
+        @OneToMany (mappedBy = "t",fetch = FetchType.LAZY, cascade = {CascadeType.ALL},orphanRemoval=true)
+        private List<test_class_2> xlist;
+
         public String getTitle() {
                 return title;
         }
@@ -38,4 +56,12 @@ public class test_class {
         public void setPrice(Double price) {
                 this.price = price;
         }
+
+        public List<test_class_2> getXlist() {
+                return xlist;
+        }
+
+        public void setXlist(List<test_class_2> xlist) {
+                this.xlist = xlist;
+        }
 }

test3_persistence/test_class_2.java

@@ -0,0 +1,54 @@
+package test3_persistence;
+
+
+import test1_cdi.GeneralInterceptorA;
+
+import javax.annotation.PostConstruct;
+import javax.persistence.*;
+import javax.validation.constraints.NotNull;
+
+@Entity
+@GeneralInterceptorA
+@NamedQuery(name = "findxg2", query = "SELECT b FROM test_class b WHERE b.title ='xg2'")
+public class test_class_2 {
+
+        @Id @GeneratedValue
+        private Long id;
+
+
+        public test_class_2 (){
+                title = "test_class_2";
+        }
+
+        private String title;
+
+        //@NotNull
+        private Double price;
+
+        @ManyToOne (fetch = FetchType.LAZY)
+        private test_class t;
+
+        public test_class getT() {
+                return t;
+        }
+
+        public void setT(test_class t) {
+                this.t = t;
+        }
+
+        public String getTitle() {
+                return title;
+        }
+
+        public void setTitle(String title) {
+                this.title = title;
+        }
+
+        public Double getPrice() {
+                return price;
+        }
+
+        public void setPrice(Double price) {
+                this.price = price;
+        }
+}