Java 如何在Hibernate中映射多个复合键?
我有一个有3个主键的表。它们是自定义id、患者id、服务提供商类型、服务提供商类型。我当前的映射如下所示Java 如何在Hibernate中映射多个复合键?,java,mysql,hibernate,hibernate-mapping,composite-primary-key,Java,Mysql,Hibernate,Hibernate Mapping,Composite Primary Key,我有一个有3个主键的表。它们是自定义id、患者id、服务提供商类型、服务提供商类型。我当前的映射如下所示 <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="beans.ServiceProvider" table="service_provider" catalog="myglukose" optimistic-lock="version">
<id name="customId" type="string">
<column name="custom_id" not-null="true"/>
</id>
<many-to-one name="patient" class="beans.Patient" fetch="select">
<column name="patient_idpatient" not-null="true"/>
</many-to-one>
<many-to-one name="serviceProviderType" class="beans.ServiceProviderType" fetch="select">
<column name="service_provider_type_idservice_provider_type" not-null="true"/>
</many-to-one>
<property name="dateCreated" type="timestamp">
<column name="date_created" length="19" />
</property>
<property name="lastUpdated" type="timestamp">
<column name="last_updated" length="19" not-null="true" />
</property>
</class>
</hibernate-mapping>
如何映射这3个组合键?您要查找的是一个组合键,而不是多个pkey 在Hibernate中,通过hbm.xml可以看到这样的情况:
<composite-id name="compId">
<key-property name="customId” column="custom_id" />
<key-property name="patientIdpatient" column="patient_idpatient" />
<key-property name="serviceProviderTypeIdserviceProviderType" column="service_provider_type_idservice_provider_type" />
</composite-id>
这可能是Id类:未测试!:
您正在寻找一个复合密钥,而不是多个pkey 在Hibernate中,通过hbm.xml可以看到这样的情况:
<composite-id name="compId">
<key-property name="customId” column="custom_id" />
<key-property name="patientIdpatient" column="patient_idpatient" />
<key-property name="serviceProviderTypeIdserviceProviderType" column="service_provider_type_idservice_provider_type" />
</composite-id>
这可能是Id类:未测试!:
你真的是指多个主键吗?还是说复合主键?我认为不可能有多个pkey…patient\u idpatient和service\u provider\u type\u idservice\u provider\u type不是service\u provider的主键,它们是该表中的外键,因为它们是其他数据库的主键tables@Ben:好的,我是通过mysql工作台创建的。是的,我认为你是正确的,请检查更新。你真的是指多个主键吗?还是说复合主键?我认为不可能有多个pkey…patient\u idpatient和service\u provider\u type\u idservice\u provider\u type不是service\u provider的主键,它们是该表中的外键,因为它们是其他数据库的主键tables@Ben:好的,我是通过mysql工作台创建的。是的,我想你是对的,请检查更新。谢谢。你能把代码添加到我给定的映射代码中来编辑它吗?在添加代码之前,我找不到是否应该删除已完成的关系映射,是否应该删除已完成的主键映射等等。@PeakGen请参阅我的编辑。你只要试一下看一下文档,这很简单…谢谢。你能把代码添加到我给定的映射代码中来编辑它吗?在添加代码之前,我找不到是否应该删除已完成的关系映射,是否应该删除已完成的主键映射等等。@PeakGen请参阅我的编辑。你只要试着读一下文档,这很容易。。。
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="beans.ServiceProvider" table="service_provider" catalog="myglukose" optimistic-lock="version">
<composite-id name="myId">
<key-property name="customId” column="custom_id" />
<key-property name="patientIdpatient" column="patient_idpatient" />
<key-property name="serviceProviderTypeIdserviceProviderType" column="service_provider_type_idservice_provider_type" />
</composite-id>
<!-- not sure with this part...maybe not needed -->
<many-to-one name="patient" class="beans.Patient" fetch="select">
<column name="patient_idpatient" not-null="true"/>
</many-to-one>
<!-- not sure with this part...maybe not needed -->
<many-to-one name="serviceProviderType" class="beans.ServiceProviderType" fetch="select">
<column name="service_provider_type_idservice_provider_type" not-null="true"/>
</many-to-one>
<property name="dateCreated" type="timestamp">
<column name="date_created" length="19" />
</property>
<property name="lastUpdated" type="timestamp">
<column name="last_updated" length="19" not-null="true" />
</property>
</class>
</hibernate-mapping>
import java.io.Serializable;
public class MyId implements Serializable {
private beans.ServiceProviderType spt;
private int customId;
private beans.Patient pat;
// an easy initializing constructor
public MyId(int customId, beans.Patient pat, beans.ServiceProviderType spt) {
this.pat = pat;
this.customId = customId;
this.spt = spt;
}
public beans.Patient getPatient() {
return pat;
}
public void setPatient(beans.Patient pat) {
this.pat = pat;
}
public beans.ServiceProviderType getServiceProviderType() {
return spt;
}
public void setServiceProviderType(beans.ServiceProviderType pat) {
this.spt = spt;
}
public int getCustomId() {
return customerId;
}
public void setCustomId(int customId) {
this.customId = customId;
}
@Override
public boolean equals(Object arg0) {
//needs implementation
}
@Override
public int hashCode() {
//needs implementation
}
}