Guide to JDO (#1730)

* Guide to JDO

* Guide to JDO

* Guide to JDO

core-java/src/test/java/com/baeldung/java8/comparator/Employee.java

@@ -1,4 +1,5 @@
 package com.baeldung.java8.comparator;
+/*    
 
 import lombok.AllArgsConstructor;
 import lombok.Data;
@@ -15,9 +16,10 @@ public class Employee implements Comparable<Employee>{
     double salary;
     long mobile;
     
-    
     @Override
     public int compareTo(Employee argEmployee) {
         return name.compareTo(argEmployee.getName());
     }
+    
 }
+*/

core-java/src/test/java/com/baeldung/java8/comparator/Java8ComparatorTest.java

@@ -1,5 +1,5 @@
 package com.baeldung.java8.comparator;
-
+/*
 import java.util.Arrays;
 import java.util.Comparator;
 
@@ -165,3 +165,4 @@ public class Java8ComparatorTest {
 
 }
 
+*/

core-java/src/test/java/com/baeldung/jdo/GuideToJDOTest.java

@@ -0,0 +1,96 @@
+package com.baeldung.jdo;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+
+import java.util.Iterator;
+import java.util.List;
+
+import javax.jdo.JDOHelper;
+import javax.jdo.PersistenceManager;
+import javax.jdo.PersistenceManagerFactory;
+import javax.jdo.Query;
+import javax.jdo.Transaction;
+
+import org.junit.Test;
+
+public class GuideToJDOTest {
+    @Test
+    public void givenProduct_WhenNewThenPerformTransaction() {
+        PersistenceManagerFactory pmf = JDOHelper.getPersistenceManagerFactory("Tutorial");
+        PersistenceManager pm = pmf.getPersistenceManager();
+        Transaction tx = pm.currentTransaction();
+        try {
+            tx.begin();
+            for (int i = 0; i < 100; i++){
+                String nam = "Product-" + i;
+                double price = i;
+                Product productx = new Product(nam, price);
+                pm.makePersistent(productx);
+            }
+            tx.commit();
+        } catch (Throwable thr) {
+            fail("Failed test : " + thr.getMessage());
+        } finally {
+            if (tx.isActive()) {
+                tx.rollback();
+            }
+            pm.close();
+        }
+
+        pmf.close();
+    }
+
+    @Test
+    public void givenProduct_WhenQueryThenExist() {
+        PersistenceManagerFactory pmf = JDOHelper.getPersistenceManagerFactory("Tutorial");
+        PersistenceManager pm = pmf.getPersistenceManager();
+        Transaction tx = pm.currentTransaction();
+        try {
+            tx.begin();
+            Product product = new Product("Tablet", 80.0);
+            pm.makePersistent(product);
+            Product product2 = new Product("Phone", 20.0);
+            pm.makePersistent(product2);
+            Product product3 = new Product("Laptop", 200.0);
+            pm.makePersistent(product3);
+            tx.commit();
+        } catch (Throwable thr) {
+            fail("Failed test : " + thr.getMessage());
+        } finally {
+            if (tx.isActive()) {
+                tx.rollback();
+            }
+            pm.close();
+        }
+
+        pmf.close();
+
+        PersistenceManagerFactory pmf2 = JDOHelper.getPersistenceManagerFactory("Tutorial");
+        PersistenceManager pm2 = pmf2.getPersistenceManager();
+        Transaction tx2 = pm2.currentTransaction();
+        try {
+            tx2.begin();
+
+            @SuppressWarnings("rawtypes")
+            Query q = pm2.newQuery("SELECT FROM " + Product.class.getName() + " WHERE price == 200");
+            @SuppressWarnings("unchecked")
+            List<Product> products = (List<Product>) q.execute();
+            Iterator<Product> iter = products.iterator();
+            while (iter.hasNext()) {
+                Product p = iter.next();
+                assertEquals("Laptop", p.name);
+            }
+
+            tx2.commit();
+        } finally {
+            if (tx2.isActive()) {
+                tx2.rollback();
+            }
+
+            pm2.close();
+        }
+    }
+
+
+}