java - hibernate - spring/bean 映射集

Question

我几乎是 spring-hibernate 的新手，我一直在努力让它发挥作用。

我有一个这样的数据模型:

patient                prescription
----------             --------------
patient_id*            prescription_id*
first_name             patient_id*
last_name              date
...

我正在使用带有 hibernate 模板的 spring bean 来定义我的 session /hibernatetemplate 和 dao，如下所示:

    <bean id="mySessionFactory"
    class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
    <property name="dataSource" ref="myDataSource" />
    <property name="mappingResources">
        <list>
            <value>./org/example/smartgwt/shared/model/prescription.hbm.xml</value>
            <value>./org/example/smartgwt/shared/model/patient.hbm.xml</value>
        </list>
    </property>
    <property name="hibernateProperties">
        <value>hibernate.dialect=org.hibernate.dialect.HSQLDialect</value>
    </property>
</bean>

<!-- Wrapper for low-level data accessing and manipulation -->
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
    <property name="sessionFactory">
        <ref bean="mySessionFactory" />
    </property>
</bean>

<!--  -->

<bean id="patientDao" class="org.example.smartgwt.server.data.PatientDao">
    <property name="hibernateTemplate">
        <ref bean="hibernateTemplate" />
    </property>
</bean>

<bean id="prescriptionDao" class="org.example.smartgwt.server.data.PrescriptionDao">
    <property name="hibernateTemplate">
        <ref bean="hibernateTemplate" />
    </property>
</bean>

有一段时间我只有patient表，一切正常。但后来我决定添加一个处方，它使用类型为patient_id 的外键。基本上我有 2 个这样的 POJO 模型对象:

public class Patient implements Serializable {

///////////////////////////////////////////////////////////////////////////
// Data members
///////////////////////////////////////////////////////////////////////////
private static final long serialVersionUID = 1L;
private int    patientId;
private String firstName;
private String lastName;
private Date   birthDate;
private String address;
private String phone;

private Set patientPrescriptions;

public Patient() {}

public void setPatientId(int patientId) {
    this.patientId = patientId;
}

public int getPatientId() {
    return patientId;
}

public void setFirstName(String firstName) {
    this.firstName = firstName;
}

public String getFirstName() {
    return firstName;
}

public void setLastName(String lastName) {
    this.lastName = lastName;
}

public String getLastName() {
    return lastName;
}

public void setBirthDate(Date birthDate) {
    this.birthDate = birthDate;
}

public Date getBirthDate() {
    return birthDate;
}

public void setAddress(String address) {
    this.address = address;
}

public String getAddress() {
    return address;
}

public void setPhone(String phone) {
    this.phone = phone;
}

public String getPhone() {
    return phone;
}

public void setPatientPrescriptions(Set patientPrescriptions) {
    this.patientPrescriptions = patientPrescriptions;
}

public Set getPatientPrescriptions() {
    return patientPrescriptions;
}
}

(类似更简单的处方)。

困扰我的是 private Set patientPrescriptions 成员。这是我的患者类别的 hbm.xml 映射。

<hibernate-mapping>
<class name="org.example.smartgwt.shared.model.Patient" table="patient" lazy="true">
    <id name="patientId" column="patient_id">
        <generator class="increment"/>
    </id>

    <property name="firstName">
        <column name="first_name"/>
    </property>
    <property name="lastName">
        <column name="last_name"/>
    </property>
    <property name="birthDate">
        <column name="birth_date"/>
    </property>
    <property name="address">
        <column name="address"/>
    </property>
    <property name="phone">
        <column name="phone"/>
    </property>

    <set name="patientPrescriptions" cascade="all">
        <key column="patient_id"/>
        <one-to-many class="Prescription"/>
    </set>

</class>

只要我在我的 patient.hbm.xml 映射文件中引用它，我就会收到错误。

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'prescriptionDao' defined in file [C:\eclipse\workspace\smart-gwt\WebContent\WEB-INF\resources\hibernate-beans.xml]: Cannot resolve reference to bean 'hibernateTemplate' while setting bean property 'hibernateTemplate'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hibernateTemplate' defined in file [C:\eclipse\workspace\smart-gwt\WebContent\WEB-INF\resources\hibernate-beans.xml]: Cannot resolve reference to bean 'mySessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mySessionFactory' defined in file [C:\eclipse\workspace\smart-gwt\WebContent\WEB-INF\resources\hibernate-beans.xml]: Invocation of init method failed; nested exception is org.hibernate.MappingException: Association references unmapped class: Prescription

为什么我会收到此 Set 的unmapped 错误？如果我从我的 hbm.xml 中删除它，我就可以在我的 session 中完成我的所有工作。请求 dao 对象时有什么特别要做的吗？这是我用来获取 dao 的代码。

        Resource resource = new FileSystemResource("./hibernate-beans.xml");
        BeanFactory factory = new XmlBeanFactory(resource);
        PrescriptionDao prescriptionDao = (PrescriptionDao)factory.getBean("prescriptionDao");
        PatientDao clientDao = (PatientDao) factory.getBean("patientDao");

谢谢

Answer 1

显而易见的答案是您的 Hibernate 映射没有提及 Prescription 类，因此 Hibernate 不知道如何处理它。

假设情况并非如此，而您只是没有向我们展示映射，那么下一个最明显的答案是:

<one-to-many class="Prescription"/>

class 属性应该是一个完全限定的类名，而 Prescription 不是。也许它应该是这样的:

<one-to-many class="org.example.smartgwt.shared.model.Prescription"/>