DataNucleusでJDBC接続

datanucleus.propertiesを作成して

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1. javax.jdo.PersistenceManagerFactoryClass=org.datanucleus.jdo.JDOPersistenceManagerFactory  
2.   
3. javax.jdo.option.ConnectionDriverName=org.hsqldb.jdbcDriver  
4. javax.jdo.option.ConnectionURL=jdbc:hsqldb:hsql://localhost/sealion_db  
5. javax.jdo.option.ConnectionUserName=sa  
6. javax.jdo.option.ConnectionPassword=  
7. javax.jdo.option.Mapping=hsql  

javax.jdo.PersistenceManagerFactoryClass=org.datanucleus.jdo.JDOPersistenceManagerFactory

javax.jdo.option.ConnectionDriverName=org.hsqldb.jdbcDriver
javax.jdo.option.ConnectionURL=jdbc:hsqldb:hsql://localhost/sealion_db
javax.jdo.option.ConnectionUserName=sa
javax.jdo.option.ConnectionPassword=
javax.jdo.option.Mapping=hsql

クラスパスのトップにおいて

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1. private static final PersistenceManagerFactory pmfInstance =  
2.        JDOHelper.getPersistenceManagerFactory("datanucleus.properties");  
3.    public static PersistenceManagerFactory get() {  
4.        return pmfInstance;  
5.    }  

 private static final PersistenceManagerFactory pmfInstance =
        JDOHelper.getPersistenceManagerFactory("datanucleus.properties");
    public static PersistenceManagerFactory get() {
        return pmfInstance;
    }

でPersistenceManagerFactoryを取得します。

これと同様にMETA-INF/jdoconfig.xmlを作成して

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1. <?xml version="1.0" encoding="utf-8"?>  
2. <jdoconfig xmlns="http://java.sun.com/xml/ns/jdo/jdoconfig"  
3.    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
4.    xsi:noNamespaceSchemaLocation="http://java.sun.com/xml/ns/jdo/jdoconfig">  
5.   
6.    <persistence-manager-factory name="transactions-optional">  
7.        <property name="javax.jdo.PersistenceManagerFactoryClass"  
8.            value="org.datanucleus.store.appengine.jdo.DatastoreJDOPersistenceManagerFactory"/>  
9.        <property name="javax.jdo.option.ConnectionURL" value="appengine"/>  
10.        <property name="javax.jdo.option.NontransactionalRead" value="true"/>  
11.        <property name="javax.jdo.option.NontransactionalWrite" value="true"/>  
12.        <property name="javax.jdo.option.RetainValues" value="true"/>  
13.        <property name="datanucleus.appengine.autoCreateDatastoreTxns" value="true"/>  
14.    </persistence-manager-factory>  
15. </jdoconfig>  

<?xml version="1.0" encoding="utf-8"?>
<jdoconfig xmlns="http://java.sun.com/xml/ns/jdo/jdoconfig"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:noNamespaceSchemaLocation="http://java.sun.com/xml/ns/jdo/jdoconfig">

   <persistence-manager-factory name="transactions-optional">
       <property name="javax.jdo.PersistenceManagerFactoryClass"
           value="org.datanucleus.store.appengine.jdo.DatastoreJDOPersistenceManagerFactory"/>
       <property name="javax.jdo.option.ConnectionURL" value="appengine"/>
       <property name="javax.jdo.option.NontransactionalRead" value="true"/>
       <property name="javax.jdo.option.NontransactionalWrite" value="true"/>
       <property name="javax.jdo.option.RetainValues" value="true"/>
       <property name="datanucleus.appengine.autoCreateDatastoreTxns" value="true"/>
   </persistence-manager-factory>
</jdoconfig>

と行います。
その場合は

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1. private static final PersistenceManagerFactory pmfInstance =  
2.        JDOHelper.getPersistenceManagerFactory("transactions-optional");  
3.    public static PersistenceManagerFactory get() {  
4.        return pmfInstance;  
5.    }  

 private static final PersistenceManagerFactory pmfInstance =
        JDOHelper.getPersistenceManagerFactory("transactions-optional");
    public static PersistenceManagerFactory get() {
        return pmfInstance;
    }

って感じになります。
何個もセッションを用意する場合は、指定子（transactions-optional）を
変更して追加します。