8

我的开发环境（IBM RAD 8 + WAS 8）抱怨我的项目没有 persistence.xml 文件。看来我仍然可以构建和运行我的项目。是否需要该文件，如果添加一个这样的文件以使我的项目通过验证，该文件中应该包含什么？

该项目是一个 Web 项目，它使用来自其他项目的会话 bean 和实体 bean，并且这个 persistence.xml 错误是项目中唯一的错误，所以我很乐意摆脱它。

谢谢你的帮助

更新

我在我的文件中搜索了 persistence.xml，它显示在 EJB 项目的 src/ 和 bin/ 中，而具有 servlet 和 jsp 的 Web 项目没有 persistence.xml，据我的同事说，Web 项目正在使用持久性。来自 EJB 项目的 xml，即：

<?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="PandoraArendeWeb" transaction-type="JTA">

        <jta-data-source>jdbc/Mainframe_TEST_ADBUTV2</jta-data-source>
        <class>se.prv.pandora.arendeprocess.entity.PRVNummer</class>
        <class>se.prv.pandora.arendeprocess.entity.Ansokan</class>
        <class>se.prv.pandora.arendeprocess.entity.NatAnsokan</class>
        <class>se.prv.pandora.arendeprocess.entity.PctAnsokan</class>
        <class>se.prv.pandora.arendeprocess.entity.ArendePerson</class>
        <class>se.prv.pandora.arendeprocess.entity.Nyregistrering</class>
        <class>se.prv.pandora.arendeprocess.entity.Anstalld</class>
        <class>se.prv.pandora.arendeprocess.entity.Handlaggare</class>
        <class>se.prv.pandora.arendeprocess.entity.OrgElement</class>
        <class>se.prv.pandora.arendeprocess.entity.FysiskHandlaggare</class>
        <class>se.prv.pandora.arendeprocess.entity.AnsvarigHandlaggare</class>
        <class>se.prv.pandora.arendeprocess.entity.AnsvarigFysiskHandlaggare</class>
        <class>se.prv.pandora.arendeprocess.entity.TeknikOmrade</class>
        <class>se.prv.pandora.arendeprocess.entity.Person</class>
        <class>se.prv.pandora.arendeprocess.entity.PRVNummerPerson</class>
        <class>se.prv.pandora.arendeprocess.entity.Notering</class>
        <class>se.prv.pandora.arendeprocess.entity.Lock</class>
        <class>se.prv.pandora.arendeprocess.entity.LandKod</class>
        <class>se.prv.pandora.arendeprocess.entity.ArbetsMomentLog</class>
        <class>se.prv.pandora.arendeprocess.entity.SystemTypDel</class>
        <class>se.prv.pandora.arendeprocess.entity.ArbetsMoment</class>
        <class>se.prv.pandora.arendeprocess.entity.UnderStatus</class>
        <class>se.prv.pandora.arendeprocess.entity.PatPers</class>
        <class>se.prv.pandora.arendeprocess.entity.PrvLandP</class>
        <class>se.prv.pandora.arendeprocess.entity.PkaPerln</class>
        <class>se.prv.pandora.arendeprocess.entity.PctnPerl</class>
        <class>se.prv.pandora.arendeprocess.entity.PersonToPatPersKoppl</class>
        <class>se.prv.pandora.arendeprocess.entity.PRVNummerPersonKoppl</class>
        <class>se.prv.pandora.arendeprocess.entity.Region</class>
        <class>se.prv.pandora.arendeprocess.entity.Historik</class>
        <class>se.prv.pandora.arendeprocess.entity.Egenskap</class>
        <exclude-unlisted-classes>true</exclude-unlisted-classes>

    </persistence-unit>

<!-- <persistence-unit name="PandoraArendeWeb_MSSQL" transaction-type="JTA">

        <jta-data-source>jdbc/MSSQL_TEST_XA</jta-data-source>
        <class>se.prv.pandora.arendeprocess.entity.PersonSearch</class>
        <exclude-unlisted-classes>true</exclude-unlisted-classes>

    </persistence-unit>
 -->    
</persistence>

在此处输入图像描述

4

3 回答 3

9

persistence.xml文件通常包含与您的数据库相关的详细信息，例如连接字符串及其各自的用户名和密码，包括其他 ORM 相关信息。这些详细信息可以放置在其他位置，因此您不需要明确拥有一个，尽管拥有这样的文件通常可以使所有与持久性相关的信息都可以在一个位置获得，这使得查找某些设置和配置变得更加容易。

这是一个示例persistence.xml文件：

<?xml version="1.0" encoding="UTF-8"?>
<persistence 
    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"
    version="1.0">
    <persistence-unit name="<PERSISTENCE UNIT NAME>">
        <properties>
            <!--
            <property name="hibernate.ejb.cfgfile" value="/hibernate.cfg.xml"/>
            <property name="hibernate.hbm2ddl.auto" value="create"/>
            -->
            <property name="hibernate.archive.autodetection" value="class, hbm"/>
            <property name="hibernate.show_sql" value="true"/>
            <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
            <property name="hibernate.connection.password" value="<PASSWORD>"/>
            <property name="hibernate.connection.url" value="jdbc:mysql://<HOST IP ADDRESS>/<DB NAME>"/>
            <property name="hibernate.connection.username" value="<USERNAME>"/>
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
            <property name="hibernate.c3p0.min_size" value="5"/>
            <property name="hibernate.c3p0.max_size" value="20"/>
            <property name="hibernate.c3p0.timeout" value="300"/>
            <property name="hibernate.c3p0.max_statements" value="50"/>
            <property name="hibernate.c3p0.idle_test_period" value="3000"/>
        </properties>
    </persistence-unit>
</persistence>

以上内容取自这里。

于 2012-05-23T06:55:49.367 回答
0 
<?xml version="1.0" encoding="UTF-8" ?>
<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"
    version="2.0" xmlns="http://java.sun.com/xml/ns/persistence">
    <persistence-unit name="AINS" transaction-type="RESOURCE_LOCAL">
        <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>

        <class>com.tridenthyundai.ains.domainobject.AccessoriesDO</class>
        <class>com.tridenthyundai.ains.domainobject.BranchDO</class>
        <class>com.tridenthyundai.ains.domainobject.ContactDO</class>
        <class>com.tridenthyundai.ains.domainobject.CustomerDO</class>
        <class>com.tridenthyundai.ains.domainobject.FinanceDO</class>
        <class>com.tridenthyundai.ains.domainobject.InsuranceDO</class>
        <class>com.tridenthyundai.ains.domainobject.MessageDO</class>
        <class>com.tridenthyundai.ains.domainobject.NotificationDO</class>
        <class>com.tridenthyundai.ains.domainobject.ProductDO</class>
        <class>com.tridenthyundai.ains.domainobject.ProductPriceDO</class>
        <class>com.tridenthyundai.ains.domainobject.ProductSpecDO</class>
        <class>com.tridenthyundai.ains.domainobject.ProductVariantDO</class>
        <class>com.tridenthyundai.ains.domainobject.PurchaseDO</class>
        <class>com.tridenthyundai.ains.domainobject.ServiceCentreDO</class>
        <class>com.tridenthyundai.ains.domainobject.ServiceDO</class>
        <class>com.tridenthyundai.ains.domainobject.ServiceTypeDO</class>
        <class>com.tridenthyundai.ains.domainobject.UserDO</class>
        <class>com.tridenthyundai.ains.domainobject.VisitorDO</class>


        <!-- shouldn't be valid for java SE per specification, but it works for  EclipseLink ... -->
        <exclude-unlisted-classes>false</exclude-unlisted-classes>

        <!-- For Local Testing -->
        <!-- <properties>
            <property name="javax.persistence.jdbc.url" value="jdbc:mysql://saptalabs:3306/tridenthyundai" />
            <property name="javax.persistence.jdbc.user" value="adminuser" />
            <property name="javax.persistence.jdbc.password" value="adminuser" />
            <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />

            <property name="eclipselink.cache.shared.default" value="false"/>
            <property name="eclipselink.ddl-generation" value="create-tables" />
            <property name="eclipselink.ddl-generation.output-mode" value="database" />
            <property name="eclipselink.logging.level" value="SEVERE" />        
        </properties> -->

        <!-- For Production -->

    </persistence-unit>
</persistence>
于 2016-02-04T04:28:15.637 回答
0 
<?xml version="1.0" encoding="UTF-8" ?>
<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"
    version="2.0" xmlns="http://java.sun.com/xml/ns/persistence">
    <persistence-unit name="saptalabs" transaction-type="RESOURCE_LOCAL">
        <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>

        <class>com.sapta.hr.domainobject.UserDO</class>
        <class>com.sapta.hr.domainobject.EmployeeDO</class>
        <class>com.sapta.hr.domainobject.AddressDO</class>
        <class>com.sapta.hr.domainobject.EmpDetailDO</class>
        <class>com.sapta.hr.domainobject.EmpAccDetailDO</class>
        <class>com.sapta.hr.domainobject.ProjectDO</class>
        <class>com.sapta.hr.domainobject.CustomerDO</class>
        <class>com.sapta.hr.domainobject.EmpAssignmentDO</class>
        <class>com.sapta.hr.domainobject.EmpAboutDO</class>
        <class>com.sapta.hr.domainobject.EmpAchievementsDO</class>
        <class>com.sapta.hr.domainobject.EmpEmploymentHistoryDO</class>
        <class>com.sapta.hr.domainobject.EmpSportsDO</class>
        <class>com.sapta.hr.domainobject.EmpCulturalsDO</class>
        <class>com.sapta.hr.domainobject.EmpEducationDO</class>
        <class>com.sapta.hr.domainobject.EmpLanguageKnownDO</class>
        <class>com.sapta.hr.domainobject.EmpReferencesDO</class>
        <class>com.sapta.hr.domainobject.EmpSkillSetDO</class>
        <class>com.sapta.hr.domainobject.EmpFamilyBackgroundDO</class>
        <class>com.sapta.hr.domainobject.AssetDO</class>
        <class>com.sapta.hr.domainobject.AssetTypeDO</class>
        <class>com.sapta.hr.domainobject.EmpCTCDO</class>
        <class>com.sapta.hr.domainobject.ExpenseDO</class>
        <class>com.sapta.hr.domainobject.ExpTypeDO</class>
        <class>com.sapta.hr.domainobject.InvoiceDO</class>
        <class>com.sapta.hr.domainobject.PayrollDO</class>
        <class>com.sapta.hr.domainobject.ProfessionalTaxDO</class>
        <class>com.sapta.hr.domainobject.TDSDO</class>
        <class>com.sapta.hr.domainobject.VendorDO</class>
        <class>com.sapta.hr.domainobject.BillsDO</class>
        <class>com.sapta.hr.domainobject.EmpLoseOfPayDO</class>

        <!-- shouldn't be valid for java SE per specification, but it works for 
            EclipseLink ... -->
        <exclude-unlisted-classes>false</exclude-unlisted-classes>

        <!-- For Local Testing -->
        <properties>
            <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/hrportal" />
            <property name="javax.persistence.jdbc.user" value="root" />
            <property name="javax.persistence.jdbc.password" value="root" />
            <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
            <property name="eclipselink.cache.shared.default" value="false" />
            <property name="eclipselink.ddl-generation" value="create-tables" />
            <property name="eclipselink.ddl-generation.output-mode"
                value="database" />
            <property name="eclipselink.logging.level" value="SEVERE" />
        </properties>
    </persistence-unit>
</persistence>
于 2017-02-22T14:37:02.897 回答