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<small><a href="./../../index.html">Home</a>&nbsp;&raquo&nbsp;<a href="./../../examples-trunk/">Examples Trunk</a>&nbsp;&raquo&nbsp;<a href="./../../examples-trunk/dynamic-dao-implementation/">Dynamic Dao Implementation</a></small><br>
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<h1>Dynamic DAO Implementation
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<p>Many aspects of Data Access Objects (DAOs) are very repetitive and boiler plate. As a fun and experimental feature, TomEE supports dynamically implementing an interface
that is seen to have standard DAO-style methods.</p>
<p>The interface has to be annotated with @PersistenceContext to define which EntityManager to use.</p>
<p>Methods should respect these conventions:</p>
<ul>
<li>void save(Foo foo): persist foo</li>
<li>Foo update(Foo foo): merge foo</li>
<li>void delete(Foo foo): remove foo, if foo is detached it tries to attach it</li>
<li>Collection<Foo>|Foo namedQuery(String name[, Map<String, ?> params, int first, int max]): run the named query called name, params contains bindings, first and max are used for magination. Last three parameters are optionnals</li>
<li>Collection<Foo>|Foo nativeQuery(String name[, Map<String, ?> params, int first, int max]): run the native query called name, params contains bindings, first and max are used for magination. Last three parameters are optionnals</li>
<li>Collection<Foo>|Foo query(String value [, Map<String, ?> params, int first, int max]): run the query put as first parameter, params contains bindings, first and max are used for magination. Last three parameters are optionnals</li>
<li>Collection<Foo> findAll([int first, int max]): find all Foo, parameters are used for pagination</li>
<li>Collection<Foo> findByBar1AndBar2AndBar3(<bar 1 type> bar1, <bar 2 type> bar2, <bar3 type> bar3 [, int first, int max]): find all Foo with specified field values for bar1, bar2, bar3.</li>
</ul>
<p>Dynamic finder can have as much as you want field constraints. For String like is used and for other type equals is used.</p>
<h1>Example</h1>
<h2>User</h2>
<pre><code>package org.superbiz.dynamic;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
@Entity
@NamedQueries({
@NamedQuery(name = "dynamic-ejb-impl-test.query", query = "SELECT u FROM User AS u WHERE u.name LIKE :name"),
@NamedQuery(name = "dynamic-ejb-impl-test.all", query = "SELECT u FROM User AS u")
})
public class User {
@Id
@GeneratedValue
private long id;
private String name;
private int age;
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
</code></pre>
<h2>UserDao</h2>
<pre><code>package org.superbiz.dynamic;
import javax.ejb.Stateless;
import javax.persistence.PersistenceContext;
import java.util.Collection;
import java.util.Map;
@Stateless
@PersistenceContext(name = "dynamic")
public interface UserDao {
User findById(long id);
Collection&lt;User&gt; findByName(String name);
Collection&lt;User&gt; findByNameAndAge(String name, int age);
Collection&lt;User&gt; findAll();
Collection&lt;User&gt; findAll(int first, int max);
Collection&lt;User&gt; namedQuery(String name, Map&lt;String, ?&gt; params, int first, int max);
Collection&lt;User&gt; namedQuery(String name, int first, int max, Map&lt;String, ?&gt; params);
Collection&lt;User&gt; namedQuery(String name, Map&lt;String, ?&gt; params);
Collection&lt;User&gt; namedQuery(String name);
Collection&lt;User&gt; query(String value, Map&lt;String, ?&gt; params);
void save(User u);
void delete(User u);
User update(User u);
}
</code></pre>
<h2>persistence.xml</h2>
<pre><code>&lt;persistence version="2.0"
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"&gt;
&lt;persistence-unit name="dynamic" transaction-type="JTA"&gt;
&lt;jta-data-source&gt;jdbc/dynamicDB&lt;/jta-data-source&gt;
&lt;class&gt;org.superbiz.dynamic.User&lt;/class&gt;
&lt;properties&gt;
&lt;property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema(ForeignKeys=true)"/&gt;
&lt;/properties&gt;
&lt;/persistence-unit&gt;
&lt;/persistence&gt;
</code></pre>
<h2>DynamicUserDaoTest</h2>
<pre><code>package org.superbiz.dynamic;
import junit.framework.Assert;
import org.junit.BeforeClass;
import org.junit.Test;
import javax.ejb.EJBException;
import javax.ejb.Stateless;
import javax.ejb.embeddable.EJBContainer;
import javax.naming.Context;
import javax.persistence.EntityManager;
import javax.persistence.NoResultException;
import javax.persistence.PersistenceContext;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import static junit.framework.Assert.assertEquals;
import static junit.framework.Assert.assertNotNull;
import static junit.framework.Assert.assertTrue;
public class DynamicUserDaoTest {
private static UserDao dao;
private static Util util;
@BeforeClass
public static void init() throws Exception {
final Properties p = new Properties();
p.put("jdbc/dynamicDB", "new://Resource?type=DataSource");
p.put("jdbc/dynamicDB.JdbcDriver", "org.hsqldb.jdbcDriver");
p.put("jdbc/dynamicDB.JdbcUrl", "jdbc:hsqldb:mem:moviedb");
p.put("jdbc/dynamicDB.UserName", "sa");
p.put("jdbc/dynamicDB.Password", "");
final Context context = EJBContainer.createEJBContainer(p).getContext();
dao = (UserDao) context.lookup("java:global/dynamic-dao-implementation/UserDao");
util = (Util) context.lookup("java:global/dynamic-dao-implementation/Util");
util.init(); // init database
}
@Test
public void simple() {
User user = dao.findById(1);
assertNotNull(user);
assertEquals(1, user.getId());
}
@Test
public void findAll() {
Collection&lt;User&gt; users = dao.findAll();
assertEquals(10, users.size());
}
@Test
public void pagination() {
Collection&lt;User&gt; users = dao.findAll(0, 5);
assertEquals(5, users.size());
users = dao.findAll(6, 1);
assertEquals(1, users.size());
assertEquals(7, users.iterator().next().getId());
}
@Test
public void persist() {
User u = new User();
dao.save(u);
assertNotNull(u.getId());
util.remove(u);
}
@Test
public void remove() {
User u = new User();
dao.save(u);
assertNotNull(u.getId());
dao.delete(u);
try {
dao.findById(u.getId());
Assert.fail();
} catch (EJBException ee) {
assertTrue(ee.getCause() instanceof NoResultException);
}
}
@Test
public void merge() {
User u = new User();
u.setAge(1);
dao.save(u);
assertEquals(1, u.getAge());
assertNotNull(u.getId());
u.setAge(2);
dao.update(u);
assertEquals(2, u.getAge());
dao.delete(u);
}
@Test
public void oneCriteria() {
Collection&lt;User&gt; users = dao.findByName("foo");
assertEquals(4, users.size());
for (User user : users) {
assertEquals("foo", user.getName());
}
}
@Test
public void twoCriteria() {
Collection&lt;User&gt; users = dao.findByNameAndAge("bar-1", 1);
assertEquals(1, users.size());
User user = users.iterator().next();
assertEquals("bar-1", user.getName());
assertEquals(1, user.getAge());
}
@Test
public void query() {
Map&lt;String, Object&gt; params = new HashMap&lt;String, Object&gt;();
params.put("name", "foo");
Collection&lt;User&gt; users = dao.namedQuery("dynamic-ejb-impl-test.query", params, 0, 100);
assertEquals(4, users.size());
users = dao.namedQuery("dynamic-ejb-impl-test.query", params);
assertEquals(4, users.size());
users = dao.namedQuery("dynamic-ejb-impl-test.query", params, 0, 2);
assertEquals(2, users.size());
users = dao.namedQuery("dynamic-ejb-impl-test.query", 0, 2, params);
assertEquals(2, users.size());
users = dao.namedQuery("dynamic-ejb-impl-test.all");
assertEquals(10, users.size());
params.remove("name");
params.put("age", 1);
users = dao.query("SELECT u FROM User AS u WHERE u.age = :age", params);
assertEquals(3, users.size());
}
@Stateless
public static class Util {
@PersistenceContext
private EntityManager em;
public void remove(User o) {
em.remove(em.find(User.class, o.getId()));
}
public void init() {
for (int i = 0; i &lt; 10; i++) {
User u = new User();
u.setAge(i % 4);
if (i % 3 == 0) {
u.setName("foo");
} else {
u.setName("bar-" + i);
}
em.persist(u);
}
}
}
}
</code></pre>
<h1>Running</h1>
<pre><code>-------------------------------------------------------
T E S T S
-------------------------------------------------------
Running org.superbiz.dynamic.DynamicUserDaoTest
Apache OpenEJB 4.0.0-beta-1 build: 20111002-04:06
http://tomee.apache.org/
INFO - openejb.home = /Users/dblevins/examples/dynamic-dao-implementation
INFO - openejb.base = /Users/dblevins/examples/dynamic-dao-implementation
INFO - Using 'javax.ejb.embeddable.EJBContainer=true'
INFO - Configuring Service(id=Default Security Service, type=SecurityService, provider-id=Default Security Service)
INFO - Configuring Service(id=Default Transaction Manager, type=TransactionManager, provider-id=Default Transaction Manager)
INFO - Configuring Service(id=jdbc/dynamicDB, type=Resource, provider-id=Default JDBC Database)
INFO - Found EjbModule in classpath: /Users/dblevins/examples/dynamic-dao-implementation/target/classes
INFO - Found EjbModule in classpath: /Users/dblevins/examples/dynamic-dao-implementation/target/test-classes
INFO - Beginning load: /Users/dblevins/examples/dynamic-dao-implementation/target/classes
INFO - Beginning load: /Users/dblevins/examples/dynamic-dao-implementation/target/test-classes
INFO - Configuring enterprise application: /Users/dblevins/examples/dynamic-dao-implementation
INFO - Configuring Service(id=Default Stateless Container, type=Container, provider-id=Default Stateless Container)
INFO - Auto-creating a container for bean UserDao: Container(type=STATELESS, id=Default Stateless Container)
INFO - Configuring Service(id=Default Managed Container, type=Container, provider-id=Default Managed Container)
INFO - Auto-creating a container for bean org.superbiz.dynamic.DynamicUserDaoTest: Container(type=MANAGED, id=Default Managed Container)
INFO - Configuring PersistenceUnit(name=dynamic)
INFO - Auto-creating a Resource with id 'jdbc/dynamicDBNonJta' of type 'DataSource for 'dynamic'.
INFO - Configuring Service(id=jdbc/dynamicDBNonJta, type=Resource, provider-id=jdbc/dynamicDB)
INFO - Adjusting PersistenceUnit dynamic &lt;non-jta-data-source&gt; to Resource ID 'jdbc/dynamicDBNonJta' from 'null'
INFO - Enterprise application "/Users/dblevins/examples/dynamic-dao-implementation" loaded.
INFO - Assembling app: /Users/dblevins/examples/dynamic-dao-implementation
INFO - PersistenceUnit(name=dynamic, provider=org.apache.openjpa.persistence.PersistenceProviderImpl) - provider time 417ms
INFO - Jndi(name="java:global/dynamic-dao-implementation/UserDao!org.superbiz.dynamic.UserDao")
INFO - Jndi(name="java:global/dynamic-dao-implementation/UserDao")
INFO - Jndi(name="java:global/dynamic-dao-implementation/Util!org.superbiz.dynamic.DynamicUserDaoTest$Util")
INFO - Jndi(name="java:global/dynamic-dao-implementation/Util")
INFO - Jndi(name="java:global/EjbModule346613126/org.superbiz.dynamic.DynamicUserDaoTest!org.superbiz.dynamic.DynamicUserDaoTest")
INFO - Jndi(name="java:global/EjbModule346613126/org.superbiz.dynamic.DynamicUserDaoTest")
INFO - Created Ejb(deployment-id=UserDao, ejb-name=UserDao, container=Default Stateless Container)
INFO - Created Ejb(deployment-id=Util, ejb-name=Util, container=Default Stateless Container)
INFO - Created Ejb(deployment-id=org.superbiz.dynamic.DynamicUserDaoTest, ejb-name=org.superbiz.dynamic.DynamicUserDaoTest, container=Default Managed Container)
INFO - Started Ejb(deployment-id=UserDao, ejb-name=UserDao, container=Default Stateless Container)
INFO - Started Ejb(deployment-id=Util, ejb-name=Util, container=Default Stateless Container)
INFO - Started Ejb(deployment-id=org.superbiz.dynamic.DynamicUserDaoTest, ejb-name=org.superbiz.dynamic.DynamicUserDaoTest, container=Default Managed Container)
INFO - Deployed Application(path=/Users/dblevins/examples/dynamic-dao-implementation)
WARN - Meta class "org.superbiz.dynamic.User_" for entity class org.superbiz.dynamic.User can not be registered with following exception "java.security.PrivilegedActionException: java.lang.ClassNotFoundException: org.superbiz.dynamic.User_"
WARN - Query "SELECT u FROM User AS u WHERE u.name LIKE :name" is removed from cache excluded permanently. Query "SELECT u FROM User AS u WHERE u.name LIKE :name" is not cached because it uses pagination..
Tests run: 9, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 2.471 sec
Results :
Tests run: 9, Failures: 0, Errors: 0, Skipped: 0
</code></pre>
<div class="page-header">&nbsp;</div>
<h4>APIs Used</h4>
<ul><li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/EJBException.html">javax.ejb.EJBException</a></li>
<li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/Stateless.html">javax.ejb.Stateless</a></li>
<li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/embeddable/EJBContainer.html">javax.ejb.embeddable.EJBContainer</a></li>
<li><a href="http://docs.oracle.com/javaee/6/api/javax/naming/Context.html">javax.naming.Context</a></li>
<li><a href="http://docs.oracle.com/javaee/6/api/javax/persistence/Entity.html">javax.persistence.Entity</a></li>
<li><a href="http://docs.oracle.com/javaee/6/api/javax/persistence/EntityManager.html">javax.persistence.EntityManager</a></li>
<li><a href="http://docs.oracle.com/javaee/6/api/javax/persistence/GeneratedValue.html">javax.persistence.GeneratedValue</a></li>
<li><a href="http://docs.oracle.com/javaee/6/api/javax/persistence/Id.html">javax.persistence.Id</a></li>
<li><a href="http://docs.oracle.com/javaee/6/api/javax/persistence/NamedQueries.html">javax.persistence.NamedQueries</a></li>
<li><a href="http://docs.oracle.com/javaee/6/api/javax/persistence/NamedQuery.html">javax.persistence.NamedQuery</a></li>
<li><a href="http://docs.oracle.com/javaee/6/api/javax/persistence/NoResultException.html">javax.persistence.NoResultException</a></li>
<li><a href="http://docs.oracle.com/javaee/6/api/javax/persistence/PersistenceContext.html">javax.persistence.PersistenceContext</a></li>
</ul>
<h3>Source</h3>
<ul>
<li>Apache <a href="http://svn.apache.org/repos/asf/tomee/tomee/trunk/examples/dynamic-dao-implementation">dynamic-dao-implementation</a></li>
<li>Github <a href="https://github.com/apache/tomee/tree/trunk/examples/dynamic-dao-implementation">dynamic-dao-implementation</a></li>
</ul>
<pre>
svn co http://svn.apache.org/repos/asf/tomee/tomee/trunk/examples/dynamic-dao-implementation
cd dynamic-dao-implementation
mvn clean install
</pre>
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