implemented unit tests using apache derby

Author: Juraj Veverka

hibernate-demo/.gitignore

@@ -8,4 +8,6 @@ target
 .project
 .idea
 *.iml
+derby.log
+
 

hibernate-demo/README.md

@@ -1,16 +1,27 @@
 # Hibernate Postgresql demo
 Inspired by [this](https://dzone.com/articles/hibernate-5-java-configuration-example) tutorial.
+This is simple demo of Hibernate ORM in Java standalone environment.
+
+## Example application
+Example application ``itx.examples.hibernate.App`` is designed to run against real postgresql server. 
+Please install and start postgresql server before running the App, following guide below.
+
+## Unit tests 
+Unit tests are designed to run with in-memory apache derby database acting like real SQL persistence database.
+
+## Build and run
+```gradle clean build test```
 
 ### Install Postresql
 Download [binary distribution](https://www.enterprisedb.com/download-postgresql-binaries) 
 of [postresql](https://www.postgresql.org/) and unzip it into ``/opt/postresql``
+
+#### Setup server
 ```
 cd /opt/postgresql
 ./bin/initdb /opt/postgresql/data
 # start server
 ./bin/pg_ctl -D /opt/postgresql/data -l /opt/postgresql/logfile start
-# stop server
-./bin/pg_ctl -D /opt/postgresql/data -l /opt/postgresql/logfile stop
 ```
 Configure database server access. In ``data/postgresql.conf``, set 
 ```
@@ -38,3 +49,6 @@ GRANT ALL PRIVILEGES ON DATABASE userdata TO username;
 \c userdata;
 select * from userdata;
 ```
+
+#### Stop server
+```./bin/pg_ctl -D /opt/postgresql/data -l /opt/postgresql/logfile stop```

hibernate-demo/build.gradle

@@ -16,6 +16,10 @@ dependencies {
    compile 'org.slf4j:slf4j-simple:1.8.0-beta2'
    compile 'org.hibernate:hibernate-core:5.4.3.Final'
    compile 'org.postgresql:postgresql:42.2.6'
+
+   testCompile 'org.apache.derby:derby:10.15.1.3'
+   testCompile 'org.apache.derby:derbytools:10.15.1.3'
+   testCompile 'org.apache.derby:derbyshared:10.15.1.3'
    testCompile 'org.testng:testng:6.14.3'
 }
 

hibernate-demo/src/main/java/itx/examples/hibernate/App.java

@@ -11,7 +11,7 @@
 
 public class App {
 
-    final private static Logger LOG = LoggerFactory.getLogger(App.class);
+    private static final Logger LOG = LoggerFactory.getLogger(App.class);
 
     public static void main(String[] args) throws Exception {
         DataAccessService dataAccessService = new DataAccessServiceImpl(HibernateUtil.getPostgresql10Properties());

hibernate-demo/src/main/java/itx/examples/hibernate/entities/UserData.java

@@ -9,7 +9,7 @@ public class UserData {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     @Column(name = "id")
-    long id;
+    Long id;
 
     @Column(name = "first_name")
     private String firstName;

hibernate-demo/src/main/java/itx/examples/hibernate/services/DataAccessServiceImpl.java

@@ -13,7 +13,7 @@
 
 public class DataAccessServiceImpl implements DataAccessService {
 
-    final private static Logger LOG = LoggerFactory.getLogger(DataAccessServiceImpl.class);
+    private static final Logger LOG = LoggerFactory.getLogger(DataAccessServiceImpl.class);
 
     private final SessionFactory sessionFactory;
 

hibernate-demo/src/test/java/itx/examples/hibernate/tests/HibernateTest.java

@@ -1,4 +1,67 @@
 package itx.examples.hibernate.tests;
 
+import itx.examples.hibernate.entities.UserData;
+import itx.examples.hibernate.services.DataAccessService;
+import itx.examples.hibernate.services.DataAccessServiceImpl;
+import org.hibernate.cfg.Environment;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.testng.Assert;
+import org.testng.annotations.AfterClass;
+import org.testng.annotations.BeforeClass;
+import org.testng.annotations.Test;
+
+import java.util.Collection;
+import java.util.Properties;
+
 public class HibernateTest {
+
+    private static final Logger LOG = LoggerFactory.getLogger(HibernateTest.class);
+
+    public static Properties getDerbyProperties() {
+        Properties properties = new Properties();
+        properties.put(Environment.DRIVER, "org.apache.derby.jdbc.EmbeddedDriver");
+        properties.put(Environment.URL, "jdbc:derby:memory:userdata;create=true");
+        properties.put(Environment.DIALECT, "org.hibernate.dialect.DerbyDialect");
+        properties.put(Environment.SHOW_SQL, "true");
+        properties.put(Environment.CURRENT_SESSION_CONTEXT_CLASS, "thread");
+        properties.put(Environment.HBM2DDL_AUTO, "update");
+        return properties;
+    }
+
+    private DataAccessService dataAccessService;
+
+    @BeforeClass
+    public void init() {
+        LOG.info("init ...");
+        dataAccessService = new DataAccessServiceImpl(getDerbyProperties());
+    }
+
+    @Test
+    public void testDataAccessService() {
+        UserData userData = new UserData("Juraj", "Veverka", "[email protected]");
+        dataAccessService.saveUserData(userData);
+
+        Collection<UserData> userDataCollection = dataAccessService.getUserData();
+        Assert.assertNotNull(userDataCollection);
+        Assert.assertFalse(userDataCollection.isEmpty());
+        UserData userDataFromDb = userDataCollection.iterator().next();
+        Assert.assertNotNull(userDataFromDb);
+        Assert.assertNotNull(userDataFromDb.getId());
+        Assert.assertEquals(userDataFromDb.getFirstName(), "Juraj");
+        Assert.assertEquals(userDataFromDb.getLastName(), "Veverka");
+        Assert.assertEquals(userDataFromDb.getEmail(), "[email protected]");
+
+        dataAccessService.deleteUserData(userDataFromDb.getId());
+        userDataCollection = dataAccessService.getUserData();
+        Assert.assertNotNull(userDataCollection);
+        Assert.assertTrue(userDataCollection.isEmpty());
+    }
+
+    @AfterClass
+    public void shutdown() throws Exception {
+        LOG.info("shutdown.");
+        dataAccessService.close();
+    }
+
 }