Move JDO from core-java to libraries (#1758)

2017-04-30 13:26:23 -04:00
parent f5f3e48f61
commit a2b327cc9d
6 changed files with 52 additions and 55 deletions
--- a/libraries/src/main/java/com/baeldung/jdo/GuideToJDO.java
+++ b/libraries/src/main/java/com/baeldung/jdo/GuideToJDO.java
@@ -0,0 +1,143 @@
+package com.baeldung.jdo;
+
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Random;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import javax.jdo.PersistenceManager;
+import javax.jdo.PersistenceManagerFactory;
+import javax.jdo.Query;
+import javax.jdo.Transaction;
+
+import org.datanucleus.api.jdo.JDOPersistenceManagerFactory;
+import org.datanucleus.metadata.PersistenceUnitMetaData;
+
+public class GuideToJDO {
+
+    private static final Logger LOGGER = Logger.getLogger(GuideToJDO.class.getName());
+    private Random rnd = new Random();
+    private PersistenceUnitMetaData pumd;
+
+    public static void main(String[] args) {
+        new GuideToJDO();
+    }
+
+    public GuideToJDO() {
+        CreateProperties();
+        CreateProducts();
+        ListProducts();
+        UpdateProducts();
+        ListProducts();
+        DeleteProducts();
+        ListProducts();
+    }
+
+    public void CreateProperties(){
+        
+        pumd = new PersistenceUnitMetaData("dynamic-unit", "RESOURCE_LOCAL", null);
+        pumd.addClassName("com.baeldung.jdo.Product");
+        pumd.setExcludeUnlistedClasses();
+        pumd.addProperty("javax.jdo.option.ConnectionDriverName", "org.h2.Driver");
+        pumd.addProperty("javax.jdo.option.ConnectionURL", "jdbc:h2:mem:mypersistence");
+        pumd.addProperty("javax.jdo.option.ConnectionUserName", "sa");
+        pumd.addProperty("javax.jdo.option.ConnectionPassword", "");
+        pumd.addProperty("datanucleus.autoCreateSchema", "true");        
+        
+    }
+    
+    public void CreateProducts() {
+        PersistenceManagerFactory pmf = new JDOPersistenceManagerFactory(pumd, null);
+        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);
+            for (int i = 0; i < 100; i++) {
+                String nam = "Product-" + i;
+                double price = rnd.nextDouble();
+                Product productx = new Product(nam, price);
+                pm.makePersistent(productx);
+            }
+            tx.commit();
+        } finally {
+            if (tx.isActive()) {
+                tx.rollback();
+            }
+            pm.close();
+        }
+    }
+
+    @SuppressWarnings("rawtypes")
+    public void UpdateProducts(){
+        PersistenceManagerFactory pmf = new JDOPersistenceManagerFactory(pumd, null);
+        PersistenceManager pm = pmf.getPersistenceManager();
+        Transaction tx = pm.currentTransaction();
+        try {
+            tx.begin();
+            Query query = pm.newQuery(Product.class, "name == \"Phone\"");
+            Collection result = (Collection) query.execute();
+            Product product = (Product) result.iterator().next();
+            product.setName("Android Phone");
+            tx.commit();
+        } finally {
+            if (tx.isActive()) {
+                tx.rollback();
+            }   
+            pm.close();
+        }
+    }
+    
+    @SuppressWarnings("rawtypes")
+    public void DeleteProducts(){
+        PersistenceManagerFactory pmf = new JDOPersistenceManagerFactory(pumd, null);
+        PersistenceManager pm = pmf.getPersistenceManager();
+        Transaction tx = pm.currentTransaction();
+        try {
+            tx.begin();
+            Query query = pm.newQuery(Product.class, "name == \"Android Phone\"");
+            Collection result = (Collection) query.execute();
+            Product product = (Product) result.iterator().next();
+            pm.deletePersistent(product);
+            tx.commit();
+        } finally {
+            if (tx.isActive()) {
+                tx.rollback();
+            }   
+            pm.close();
+        }
+    }
+    
+    @SuppressWarnings({ "rawtypes", "unchecked" })
+    public void ListProducts() {
+        PersistenceManagerFactory pmf = new JDOPersistenceManagerFactory(pumd, null);
+        PersistenceManager pm = pmf.getPersistenceManager();
+        Transaction tx = pm.currentTransaction();
+        try {
+            tx.begin();
+
+            Query q = pm.newQuery("SELECT FROM " + Product.class.getName() + " WHERE price > 10");
+            List<Product> products = (List<Product>) q.execute();
+            Iterator<Product> iter = products.iterator();
+            while (iter.hasNext()) {
+                Product p = iter.next();
+                LOGGER.log(Level.WARNING, "Product name: {0} - Price: {1}", new Object[] { p.name, p.price });
+            }
+            LOGGER.log(Level.INFO, "--------------------------------------------------------------");
+            tx.commit();
+        } finally {
+            if (tx.isActive()) {
+                tx.rollback();
+            }
+
+            pm.close();
+        }
+    }
+}