Guide to JDO (#1730)

* Guide to JDO

* Guide to JDO

* Guide to JDO

core-java/pom.xml

@@ -165,19 +165,61 @@
             <groupId>org.javamoney</groupId>
             <artifactId>moneta</artifactId>
             <version>1.1</version>
-        </dependency>    
+        </dependency>
+		<dependency>
+			<groupId>org.owasp.esapi</groupId>
+			<artifactId>esapi</artifactId>
+			<version>2.1.0.1</version>
+			<exclusions>
+				<exclusion>
+					<artifactId>commons-logging</artifactId>
+					<groupId>commons-logging</groupId>
+				</exclusion>
+			</exclusions>        
+		</dependency>               
+		<!-- JDO -->
+		<dependency>
+		    <groupId>org.datanucleus</groupId>
+		    <artifactId>javax.jdo</artifactId>
+		    <version>3.2.0-m6</version>
+		</dependency>
+		<dependency>
+		    <groupId>org.datanucleus</groupId>
+		    <artifactId>datanucleus-core</artifactId>
+		    <version>5.1.0-m1</version>
+		</dependency>
+		<dependency>
+		    <groupId>org.datanucleus</groupId>
+		    <artifactId>datanucleus-api-jdo</artifactId>
+		    <version>5.1.0-m1</version>
+		</dependency>
+		<dependency>
+		    <groupId>org.datanucleus</groupId>
+		    <artifactId>datanucleus-rdbms</artifactId>
+		    <version>5.1.0-m1</version>
+		</dependency>
+		<dependency>
+		    <groupId>org.datanucleus</groupId>
+		    <artifactId>datanucleus-maven-plugin</artifactId>
+		    <version>5.0.2</version>
+		</dependency>		
+		<dependency>
+		    <groupId>com.h2database</groupId>
+		    <artifactId>h2</artifactId>
+		    <version>1.4.194</version>
+		</dependency>
 
-	<dependency>
+		<dependency>
-	    <groupId>org.owasp.esapi</groupId>
+		    <groupId>org.owasp.esapi</groupId>
-	    <artifactId>esapi</artifactId>
+		    <artifactId>esapi</artifactId>
-	    <version>2.1.0.1</version>
+		    <version>2.1.0.1</version>
-                <exclusions>
+	                <exclusions>
-                    <exclusion>
+	                    <exclusion>
-                        <artifactId>commons-logging</artifactId>
+	                        <artifactId>commons-logging</artifactId>
-                        <groupId>commons-logging</groupId>
+	                        <groupId>commons-logging</groupId>
-                    </exclusion>
+	                    </exclusion>
-                </exclusions>        
+	                </exclusions>        
-	</dependency>    
+		</dependency>    
 
     </dependencies>
 
@@ -191,7 +233,6 @@
         </resources>
 
         <plugins>
-
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
@@ -201,7 +242,6 @@
                     <target>1.8</target>
                 </configuration>
             </plugin>
-
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>
@@ -214,7 +254,6 @@
                     <testFailureIgnore>true</testFailureIgnore>
                 </configuration>
             </plugin>
-
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-dependency-plugin</artifactId>
@@ -245,7 +284,6 @@
                     </archive>
                 </configuration>
             </plugin>
-
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-assembly-plugin</artifactId>
@@ -269,7 +307,6 @@
                     </execution>
                 </executions>
             </plugin>
-
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-shade-plugin</artifactId>
@@ -290,7 +327,6 @@
                     </execution>
                 </executions>
             </plugin>
-
             <plugin>
                 <groupId>com.jolira</groupId>
                 <artifactId>onejar-maven-plugin</artifactId>
@@ -307,7 +343,6 @@
                     </execution>
                 </executions>
             </plugin>
-
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
@@ -323,6 +358,28 @@
                     </execution>
                 </executions>
             </plugin>
+            
+            <!-- JDO Plugin -->
+
+			<plugin>
+                <groupId>org.datanucleus</groupId>
+    			<artifactId>datanucleus-maven-plugin</artifactId>
+    			<version>5.0.2</version>
+                <configuration>
+                    <api>JDO</api>
+                    <props>${basedir}/datanucleus.properties</props>
+                    <log4jConfiguration>${basedir}/log4j.properties</log4jConfiguration>
+                    <verbose>true</verbose>
+                </configuration>
+				<executions>
+                	<execution>
+                        <phase>process-classes</phase>
+                        <goals>
+                            <goal>enhance</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
 
         </plugins>
 

core-java/src/main/java/com/baeldung/jdo/GuideToJDO.java

@@ -0,0 +1,83 @@
+package com.baeldung.jdo;
+
+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.JDOHelper;
+import javax.jdo.PersistenceManager;
+import javax.jdo.PersistenceManagerFactory;
+import javax.jdo.Query;
+import javax.jdo.Transaction;
+
+public class GuideToJDO {
+
+    private static final Logger LOGGER = Logger.getLogger(GuideToJDO.class.getName());
+    private Random rnd = new Random();
+
+    public static void main(String[] args) {
+        new GuideToJDO();
+    }
+
+    public GuideToJDO() {
+        CreateProducts();
+        ListProducts();
+    }
+
+    public void CreateProducts() {
+        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);
+            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("unchecked")
+    public void ListProducts() {
+        PersistenceManagerFactory pmf = JDOHelper.getPersistenceManagerFactory("Tutorial");
+        PersistenceManager pm = pmf.getPersistenceManager();
+        Transaction tx = pm.currentTransaction();
+        try {
+            tx.begin();
+
+            @SuppressWarnings("rawtypes")
+            Query q = pm.newQuery("SELECT FROM " + Product.class.getName() + " WHERE price < 1");
+            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 });
+            }
+
+            tx.commit();
+        } finally {
+            if (tx.isActive()) {
+                tx.rollback();
+            }
+
+            pm.close();
+        }
+    }
+}

core-java/src/main/java/com/baeldung/jdo/Product.java

@@ -0,0 +1,43 @@
+package com.baeldung.jdo;
+
+import javax.jdo.annotations.IdGeneratorStrategy;
+import javax.jdo.annotations.PersistenceCapable;
+import javax.jdo.annotations.Persistent;
+import javax.jdo.annotations.PrimaryKey;
+
+@PersistenceCapable
+public class Product {
+
+    @PrimaryKey
+    @Persistent(valueStrategy = IdGeneratorStrategy.INCREMENT)
+    long id;
+    String name = null;
+    Double price = 0.0;
+
+    public Product() {
+        this.name = null;
+        this.price = 0.0;
+    }
+
+    public Product(String name, Double price) {
+        this.name = name;
+        this.price = price;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Double getPrice() {
+        return price;
+    }
+
+    public void setPrice(Double price) {
+        this.price = price;
+    }
+
+}

core-java/src/main/resources/META-INF/persistence.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
+        http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd" version="2.1">
+
+    <!-- JDO tutorial "unit" -->
+    <persistence-unit name="Tutorial">
+        <exclude-unlisted-classes/>
+		<properties>
+			<property name="javax.jdo.PersistenceManagerFactoryClass" value="org.datanucleus.api.jdo.JDOPersistenceManagerFactory"/>		
+		    <property name="javax.jdo.option.ConnectionURL" value="jdbc:h2:mem:mypersistence"/>
+		    <property name="javax.jdo.option.ConnectionDriverName" value="org.h2.Driver"/>
+		    <property name="javax.jdo.option.ConnectionUserName" value="sa"/>
+		    <property name="javax.jdo.option.ConnectionPassword" value=""/>
+		    <property name="datanucleus.schema.autoCreateAll" value="true"/>
+		</properties>
+    </persistence-unit>
+</persistence>
+

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();
+        }
+    }
+
+
+}