jpa--数据源配置方法persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0"
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_1_0.xsd">
<persistence-unit name="TODS" transaction-type="JTA">
<provider>
org.apache.openjpa.persistence.PersistenceProviderImpl
</provider>
<jta-data-source>jdbc/TODS</jta-data-source>
<class>com.ibm.its.itmc.entity.Zone</class>
<class>com.ibm.its.itmc.entity.Vms</class>
<class>com.ibm.its.itmc.entity.AlertVms</class>
<class>com.ibm.its.itmc.entity.AlertMessage</class>
<class>com.ibm.its.itmc.entity.TrafficControl</class>
<class>com.ibm.its.itmc.entity.Road</class>
<class>com.ibm.its.itmc.entity.ResponsePlan</class>
<class>com.ibm.its.itmc.entity.ResponseAction</class>
<class>com.ibm.its.itmc.entity.RealtimeReportPK</class>
<class>com.ibm.its.itmc.entity.RealtimeReport</class>
<class>com.ibm.its.itmc.entity.Node</class>
<class>com.ibm.its.itmc.entity.Message</class>
<class>com.ibm.its.itmc.entity.Link</class>
<class>com.ibm.its.itmc.entity.ForecastReportPK</class>
<class>com.ibm.its.itmc.entity.ForecastReport</class>
<class>com.ibm.its.itmc.entity.Event</class>
<class>com.ibm.its.itmc.entity.Camera</class>
<class>com.ibm.its.itmc.entity.LinkProfile</class>
<class>com.ibm.its.itmc.entity.LinkProfilePK</class>

<exclude-unlisted-classes>true</exclude-unlisted-classes>

<properties>
<property name="openjpa.jdbc.Schema" value="TODS" />
<property name="openjpa.jdbc.DBDictionary" value="db2" />
<property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema(ForeignKeys=true)"/>
<property name="openjpa.Log" value="DefaultLevel=WARN, Tool=INFO"/>
</properties>
</persistence-unit>

<persistence-unit name="TADS" transaction-type="JTA">
<provider>
org.apache.openjpa.persistence.PersistenceProviderImpl
</provider>
<jta-data-source>jdbc/testVD</jta-data-source>
<class>com.ibm.its.itmc.entity.TadsZone</class>
<class>com.ibm.its.itmc.entity.TadsRoad</class>
<class>com.ibm.its.itmc.entity.TadsLink</class>
<class>com.ibm.its.itmc.entity.TadsNode</class>
<class>com.ibm.its.itmc.entity.TadsDate</class>
<class>com.ibm.its.itmc.entity.TadsLinkCatagory</class>
<class>com.ibm.its.itmc.entity.TadsNodeCatagory</class>

<exclude-unlisted-classes>true</exclude-unlisted-classes>

<properties>
<property name="openjpa.jdbc.Schema" value="TADS" />
<property name="openjpa.jdbc.DBDictionary" value="db2" />
<property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema(ForeignKeys=true)"/>
<property name="openjpa.Log" value="DefaultLevel=WARN, Tool=INFO"/>
</properties>
</persistence-unit>
</persistence>

方法二：数据源在工程内配置：
transaction-type="RESOURCE_LOCAL"和datasource的配置不同，

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0"
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_1_0.xsd">
<persistence-unit name="TODS" transaction-type="RESOURCE_LOCAL ">
<provider>
org.apache.openjpa.persistence.PersistenceProviderImpl
</provider>

<class>com.ibm.its.itmc.entity.Zone</class>
<class>com.ibm.its.itmc.entity.Vms</class>
<class>com.ibm.its.itmc.entity.TrafficControl</class>
<class>com.ibm.its.itmc.entity.Road</class>
<class>com.ibm.its.itmc.entity.ResponsePlan</class>
<class>com.ibm.its.itmc.entity.ResponseAction</class>
<class>com.ibm.its.itmc.entity.RealtimeReportPK</class>
<class>com.ibm.its.itmc.entity.RealtimeReport</class>
<class>com.ibm.its.itmc.entity.Node</class>
<class>com.ibm.its.itmc.entity.Message</class>
<class>com.ibm.its.itmc.entity.Link</class>
<class>com.ibm.its.itmc.entity.ForecastReportPK</class>
<class>com.ibm.its.itmc.entity.ForecastReport</class>
<class>com.ibm.its.itmc.entity.Event</class>
<class>com.ibm.its.itmc.entity.Camera</class>
<class>com.ibm.its.itmc.entity.TmLinkProfile</class>
<class>com.ibm.its.itmc.entity.TmLinkProfilePK</class>

<exclude-unlisted-classes>true</exclude-unlisted-classes>

<<properties>
<property name="openjpa.ConnectionURL" value="jdbc:db2://9.123.109.152:50000/TODS" />
<property name="openjpa.ConnectionDriverName" value="com.ibm.db2.jcc.DB2Driver" />
<property name="openjpa.Log" value="none" />
<property name="openjpa.ConnectionUserName" value="db2admin" />
<property name="openjpa.ConnectionPassword" value="passw0rd" />
<property name="openjpa.jdbc.TransactionIsolation" value="read-committed" />
<property name="openjpa.jdbc.Schema" value="TODS" />
</properties>

</persistence-unit>
</persistence>