/******************************************************************************* | |
* Copyright (c) 1998, 2008 Oracle. All rights reserved. | |
* This program and the accompanying materials are made available under the | |
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0 | |
* which accompanies this distribution. | |
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html | |
* and the Eclipse Distribution License is available at | |
* http://www.eclipse.org/org/documents/edl-v10.php. | |
* | |
* Contributors: | |
* dclarke - SimpleDynamicMap Example - Bug 277731 | |
* http://wiki.eclipse.org/EclipseLink/Examples/JPA/Dynamic/SimpleDynamicMap | |
* | |
* This code is being developed under INCUBATION and is not currently included | |
* in the automated EclipseLink build. The API in this code may change, or | |
* may never be included in the product. Please provide feedback through mailing | |
* lists or the bug database. | |
******************************************************************************/ | |
package example; | |
import java.io.FileInputStream; | |
import java.io.FileNotFoundException; | |
import java.io.IOException; | |
import java.util.List; | |
import java.util.Map; | |
import java.util.Properties; | |
import org.eclipse.persistence.config.PersistenceUnitProperties; | |
import org.eclipse.persistence.descriptors.ClassDescriptor; | |
import org.eclipse.persistence.descriptors.RelationalDescriptor; | |
import org.eclipse.persistence.dynamic.DynamicClassLoader; | |
import org.eclipse.persistence.expressions.ExpressionBuilder; | |
import org.eclipse.persistence.logging.SessionLog; | |
import org.eclipse.persistence.mappings.DirectToFieldMapping; | |
import org.eclipse.persistence.queries.ReadAllQuery; | |
import org.eclipse.persistence.queries.ReadObjectQuery; | |
import org.eclipse.persistence.sessions.DatabaseLogin; | |
import org.eclipse.persistence.sessions.DatabaseSession; | |
import org.eclipse.persistence.sessions.Project; | |
import org.eclipse.persistence.sessions.UnitOfWork; | |
import org.eclipse.persistence.tools.schemaframework.SchemaManager; | |
public class SimpleDynamicMap_NativeExample { | |
/** | |
* | |
*/ | |
public static void main(String[] args) { | |
SimpleDynamicMap_NativeExample example = new SimpleDynamicMap_NativeExample(); | |
DatabaseSession session = example.createSession(); | |
ClassDescriptor descriptor = example.createDynamicType(session); | |
example.persistDynamicInstances(session, descriptor); | |
example.queryDynamicInstances(session, descriptor); | |
example.updateDyanmicInstances(session, descriptor); | |
example.deleteDynamicInstances(session, descriptor); | |
example.removeDynamicType(session, descriptor); | |
try { | |
} finally { | |
session.logout(); | |
} | |
} | |
/** | |
* Create a new dynamic type called 'SimpleType' with the class name of | |
* 'model.SimpleType'. The generated class would look like: <code> | |
* package model; | |
* public class SimpleType extends example.dynamic.DynamicEntity {} | |
* </code> | |
* | |
* The attributes defined in the mapping give the class the apparent | |
* structure of: <code> | |
* package model; | |
* public class SimpleType extends example.dynamic.DynamicEntity { | |
* Integer id; | |
* String value; | |
* } | |
* </code> | |
*/ | |
public ClassDescriptor createDynamicType(DatabaseSession session) { | |
RelationalDescriptor descriptor = new RelationalDescriptor(); | |
descriptor.setJavaClassName("model.SimpleType"); | |
DynamicClassLoader dcl = DynamicClassLoader.lookup(session); | |
dcl.addClass("model.SimpleType", DynamicMapEntity.class); | |
try { | |
descriptor.setJavaClass(dcl.loadClass(descriptor.getJavaClassName())); | |
} catch (ClassNotFoundException e) { | |
// TODO Auto-generated catch block | |
e.printStackTrace(); | |
} | |
descriptor.setTableName("DYNAMIC_SIMPLE"); | |
descriptor.setPrimaryKeyFieldName("ID"); | |
DirectToFieldMapping mapping = (DirectToFieldMapping) descriptor.addDirectMapping("id", "ID"); | |
mapping.setAttributeAccessor(new ValueAccessor(mapping, Integer.class)); | |
mapping = (DirectToFieldMapping) descriptor.addDirectMapping("value", "VALUE"); | |
mapping.setAttributeAccessor(new ValueAccessor(mapping, String.class)); | |
session.addDescriptor(descriptor); | |
// Create the underlying table on the database. Drop it if it already | |
// exists | |
new SchemaManager(session).replaceDefaultTables(); | |
return descriptor; | |
} | |
public Map persistDynamicInstances(DatabaseSession session, ClassDescriptor descriptor) { | |
UnitOfWork uow = session.acquireUnitOfWork(); | |
Map entity = (Map) uow.newInstance(descriptor.getJavaClass()); | |
entity.put("id", 1); | |
entity.put("value", "value-1"); | |
uow.commit(); | |
return entity; | |
} | |
public List<Map> queryDynamicInstances(DatabaseSession session, ClassDescriptor descriptor) { | |
ReadAllQuery query = new ReadAllQuery(descriptor.getJavaClass()); | |
ExpressionBuilder eb = query.getExpressionBuilder(); | |
query.setSelectionCriteria(eb.get("value").like("v%")); | |
return (List<Map>) session.executeQuery(query); | |
} | |
public Map updateDyanmicInstances(DatabaseSession session, ClassDescriptor descriptor) { | |
UnitOfWork uow = session.acquireUnitOfWork(); | |
ReadObjectQuery query = new ReadObjectQuery(descriptor.getJavaClass()); | |
ExpressionBuilder eb = query.getExpressionBuilder(); | |
query.setSelectionCriteria(eb.get("id").equal(1)); | |
Map entity = (Map) uow.executeQuery(query); | |
entity.put("value", "value-1+"); | |
uow.commit(); | |
return entity; | |
} | |
public void deleteDynamicInstances(DatabaseSession session, ClassDescriptor descriptor) { | |
UnitOfWork uow = session.acquireUnitOfWork(); | |
ReadObjectQuery query = new ReadObjectQuery(descriptor.getJavaClass()); | |
ExpressionBuilder eb = query.getExpressionBuilder(); | |
query.setSelectionCriteria(eb.get("id").equal(1)); | |
Map entity = (Map) uow.executeQuery(query); | |
uow.deleteObject(entity); | |
uow.commit(); | |
} | |
public void removeDynamicType(DatabaseSession session, ClassDescriptor descriptor) { | |
session.getIdentityMapAccessor().initializeIdentityMap(descriptor.getJavaClass()); | |
session.getDescriptors().remove(descriptor.getJavaClass()); | |
session.getProject().getAliasDescriptors().remove(descriptor.getAlias()); | |
session.getProject().getOrderedDescriptors().remove(descriptor); | |
} | |
/** | |
* Create a database session with no descriptors. The property values used | |
* to populate the DatabaseLogin object are loaded from a 'test.properties' | |
* file stored in the user's home. | |
* | |
* The test.properties file could appear as: | |
* | |
* eclipselink.jdbc.driver=oracle.jdbc.OracleDriver | |
* eclipselink.jdbc.url=jdbc:oracle:thin:@localhost:1521:ORCL | |
* eclipselink.jdbc.user=scott eclipselink.jdbc.pwd=tiger | |
* eclipselink.target- | |
* database=org.eclipse.persistence.platform.database.OraclePlatform | |
* | |
* | |
* @return newly created and logged in Session | |
*/ | |
public DatabaseSession createSession() { | |
Properties testProps = new Properties(); | |
FileInputStream in = null; | |
try { | |
in = new FileInputStream("test.properties"); | |
testProps.load(in); | |
} catch (FileNotFoundException e) { | |
} catch (IOException e) { | |
} finally { | |
if (in != null) { | |
try { | |
in.close(); | |
} catch (IOException e) { | |
} | |
} | |
} | |
DatabaseLogin login = new DatabaseLogin(); | |
login.setDriverClassName((String) testProps.get(PersistenceUnitProperties.JDBC_DRIVER)); | |
login.setDatabaseURL((String) testProps.get(PersistenceUnitProperties.JDBC_URL)); | |
login.setUserName((String) testProps.get(PersistenceUnitProperties.JDBC_USER)); | |
login.setPassword((String) testProps.get(PersistenceUnitProperties.JDBC_PASSWORD)); | |
login.setPlatformClassName((String) testProps.get(PersistenceUnitProperties.TARGET_DATABASE)); | |
DatabaseSession session = new Project(login).createDatabaseSession(); | |
session.getSessionLog().setLevel(SessionLog.FINE); | |
session.login(); | |
return session; | |
} | |
} |