Add Department entity and basic tests

.gitignore

+/target
+.classpath
+.project
+.settings
+

src/main/java/dgpena/siexample/persistence/Department.java

+package dgpena.siexample.persistence;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+
+@Entity
+public class Department {
+	
+	@Id
+	@GeneratedValue(strategy=GenerationType.IDENTITY)
+	private int id;
+
+	private String name;
+	
+	public int getId() {
+		return id;
+	}
+	
+	public String getName() {
+		return name;
+	}
+	
+	public void setName(String name) {
+		this.name = name;
+	}
+}

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

+<persistence xmlns="http://java.sun.com/xml/ns/persistence"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
+	version="2.0">
+	<persistence-unit name="si-database" transaction-type="RESOURCE_LOCAL">
+		<class>dgpena.siexample.persistence.Department</class>
+		
+		<properties>
+			<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
+			<property name="javax.persistence.jdbc.user" value="siuser" />
+			<property name="javax.persistence.jdbc.password" value="sipass" />
+			<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/si" />
+			<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5InnoDBDialect" />
+			<property name="hibernate.max_fetch_depth" value="3" />
+			<property name="hibernate.hbm2ddl.auto" value="create" />
+			<property name="hibernate.show_sql" value="true" />
+			<property name="hibernate.format_sql" value="true" />
+			<property name="hibernate.use_sql_comments" value="true" />
+			<property name="hibernate.connection.autocommit" value="false" />
+
+			<!-- alternatively to <class> and <property> declarations, you can use 
+				a regular hibernate.cfg.xml file -->
+			<!-- property name="hibernate.ejb.cfgfile" value="/org/hibernate/ejb/test/hibernate.cfg.xml"/ -->
+		</properties>
+	</persistence-unit>
+</persistence>

src/test/java/dgpena/siexample/persistence/DepartmentTest.java

+package dgpena.siexample.persistence;
+
+import static org.junit.Assert.assertEquals;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+
+import javax.persistence.EntityManager;
+import javax.persistence.EntityManagerFactory;
+import javax.persistence.Persistence;
+
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+public class DepartmentTest extends SQLBasedTest {
+
+	private static EntityManagerFactory emf;
+	
+	@BeforeClass
+	public static void setUpEntityManagerFactory() {
+		emf = Persistence.createEntityManagerFactory("si-database");
+	}
+	
+	@Test
+	public void testCreateDepartment() throws Exception {
+		EntityManager em = emf.createEntityManager();
+		
+		Department d = new Department();
+		d.setName("finanzas");
+		
+		em.getTransaction().begin();
+			em.persist(d);
+		em.getTransaction().commit();
+		
+		// check in the DB using JDBC
+		int deptId = d.getId();
+		
+		
+		Statement statement = jdbcConnection.createStatement();
+		ResultSet rs = statement.executeQuery("SELECT COUNT(*) as total FROM Department d where d.id = "+deptId);
+		rs.next();
+		
+		assertEquals(1, rs.getInt("total"));
+	}
+	
+	@Test
+	public void testFindDepartment() throws SQLException {
+		// insert a department previously with JDBC
+		Statement statement = jdbcConnection.createStatement();
+		statement.executeUpdate("INSERT INTO Department(name) values('finanzas')", Statement.RETURN_GENERATED_KEYS);
+		int deptId = getLastInsertedId(statement);
+
+		
+		EntityManager em = emf.createEntityManager();
+		
+		Department d = em.find(Department.class, deptId);
+		
+		assertEquals(deptId, d.getId());
+		assertEquals("finanzas", d.getName());
+		
+	}
+}

src/test/java/dgpena/siexample/persistence/SQLBasedTest.java

+package dgpena.siexample.persistence;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+
+public class SQLBasedTest {
+	
+	private static final String DB_URL = "jdbc:mysql://localhost:3306/si";
+	private static final String DB_USER = "siuser";
+	private static final String DB_PASS = "sipass";
+	protected static Connection jdbcConnection = createConnection();
+	
+	private static Connection createConnection() {
+		try {
+		Class.forName("com.mysql.jdbc.Driver");
+		return DriverManager.getConnection(DB_URL, DB_USER, DB_PASS);
+		} catch(Exception e) {
+			throw new RuntimeException(e);
+		}
+		
+	}
+	
+	protected int getLastInsertedId(Statement statement) throws SQLException {
+		ResultSet rs = statement.getGeneratedKeys();
+		rs.next();
+		
+		return rs.getInt(1);
+	}
+}

src/test/resources/META-INF/persistence.xml

+<persistence xmlns="http://java.sun.com/xml/ns/persistence"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
+	version="2.0">
+	<persistence-unit name="si-database" transaction-type="RESOURCE_LOCAL">
+		<class>dgpena.siexample.persistence.Department</class>
+		<properties>
+			<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
+			<property name="javax.persistence.jdbc.user" value="siuser" />
+			<property name="javax.persistence.jdbc.password" value="sipass" />
+			<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/si" />
+			<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5InnoDBDialect" />
+			<property name="hibernate.max_fetch_depth" value="3" />
+			<property name="hibernate.hbm2ddl.auto" value="create" />
+			<property name="hibernate.show_sql" value="true" />
+			<property name="hibernate.format_sql" value="true" />
+			<property name="hibernate.use_sql_comments" value="true" />
+			<property name="hibernate.connection.autocommit" value="false" />
+
+			<!-- alternatively to <class> and <property> declarations, you can use 
+				a regular hibernate.cfg.xml file -->
+			<!-- property name="hibernate.ejb.cfgfile" value="/org/hibernate/ejb/test/hibernate.cfg.xml"/ -->
+		</properties>
+	</persistence-unit>
+</persistence>