jpa--數據源配置方法persistence.xml

 方法一：多數據源的data source配置：
主要通過<jta-data-source>標籤來配置。

<?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：數據源在工程內配置：
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>

3 from local resource get JPA datasource way:

<?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="EVEP" transaction-type="RESOURCE_LOCAL">
        <provider>
            org.apache.openjpa.persistence.PersistenceProviderImpl
        </provider>
        <class>com.ibm.eve.core.entity.BatteryProfile</class>               
        <class>com.ibm.eve.core.entity.ConsumerAcct</class>                 
        <class>com.ibm.eve.core.entity.ConsumerAcctBal</class>              
        <class>com.ibm.eve.core.entity.ConsumerAcctProviderSvc</class>      
        <class>com.ibm.eve.core.entity.ConsumerAcctProviderSvcPref</class>          
        <class>com.ibm.eve.core.entity.ConsumerToken</class>
        <class>com.ibm.eve.core.entity.ConInfo</class>                      
        <class>com.ibm.eve.core.entity.EnergyRt</class>                     
        <class>com.ibm.eve.core.entity.EntityTag</class>                    
        <class>com.ibm.eve.core.entity.Evse</class>                         
        <class>com.ibm.eve.core.entity.EvseConn</class>                     
        <class>com.ibm.eve.core.entity.EvseFees</class>                     
        <class>com.ibm.eve.core.entity.Firmware</class>                     
        <class>com.ibm.eve.core.entity.ListGenLog</class>                   
        <class>com.ibm.eve.core.entity.Mkt</class>                          
        <class>com.ibm.eve.core.entity.ModelProfile</class>                 
        <class>com.ibm.eve.core.entity.ModelProfileIntvl</class>            
        <class>com.ibm.eve.core.entity.PhysicalAdr</class>                  
        <class>com.ibm.eve.core.entity.Provider</class>     
        <class>com.ibm.eve.core.entity.ProviderInterop</class>  
        <class>com.ibm.eve.core.entity.ProviderSvc</class>                  
        <class>com.ibm.eve.core.entity.ProviderSvcConsumerAcct</class>      
        <class>com.ibm.eve.core.entity.RechgTxn</class>                     
        <class>com.ibm.eve.core.entity.RechgTxnIntvl</class>                
        <class>com.ibm.eve.core.entity.Reservation</class>                  
        <class>com.ibm.eve.core.entity.SettlementLog</class>                
        <class>com.ibm.eve.core.entity.Xfmr</class>                         
        <class>com.ibm.eve.core.entity.XfmrLoadForecast</class>             

        
        <exclude-unlisted-classes/>
        <properties>
            
             <property name="openjpa.ConnectionURL" value="jdbc:db2://9.39.92.17:50000/EVE_CTPA:retrieveMessagesFromServerOnGetMessage=true;" />
            
            <property name="openjpa.ConnectionDriverName" value="com.ibm.db2.jcc.DB2Driver" />
            <property name="openjpa.Log" value="SQL=TRACE" />
            <property name="openjpa.ConnectionUserName" value="db2inst1" />
            <property name="openjpa.ConnectionPassword" value="db2inst1" />
            <property name="openjpa.jdbc.TransactionIsolation" value="none" />
            <property name="openjpa.jdbc.Schema" value="EVE_CTPA" />
            <property name="openjpa.RuntimeUnenhancedClasses" value="supported"/>
            <property name="openjpa.Compatibility" value="StrictIdentityValues=false"/>
            <property name="openjpa.jdbc.SchemaFactory" value="native(ForeignKeys=true)"/>
            <property name="openjpa.AutoDetach" value="close, commit, nontx-read"/>
           
            
            <!--
            <property name="openjpa.ConnectionDriverName" value="com.ibm.db2.jcc.com.ibm.db2.jcc.DB2ConnectionPoolDataSource"/>      
          
            <property name="openjpa.ConnectionURL" value="jdbc:db2://9.115.68.242:50001/EVE:driverType=4;retrieveMessagesFromServerOnGetMessage=true;fullyMaterializeLobData=true;fullyMaterializeInputStreams=true;progressiveStreaming=2;progresssiveLocators=2;"/>
            <property name="openjpa.ConnectionURL" value="jdbc:db2://localhost:50000/EVE" />
            <property name="openjpa.ConnectionDriverName" value="com.ibm.db2.jcc.DB2Driver" />
            <property name="openjpa.Log" value="SQL=TRACE" />
            <property name="openjpa.ConnectionUserName" value="admin" />
            <property name="openjpa.ConnectionPassword" value="oneclick" />
            <property name="openjpa.jdbc.TransactionIsolation" value="read-committed" />
            <property name="openjpa.jdbc.Schema" value="EVE" />
            <property name="openjpa.RuntimeUnenhancedClasses" value="supported"/>
            <property name="openjpa.Compatibility" value="StrictIdentityValues=false"/>    
            -->       
        </properties>
    </persistence-unit>
</persistence>