[英]Composite id in Hibernate
Good evening folks. 大家晚上好。
I'm developing an application which uses Hibernate 4.x. 我正在开发一个使用Hibernate 4.x的应用程序。 I'm currently having problems while using a composite id in a class and, mapping a relation of another class to this one.
我目前在类中使用复合ID并将另一个类的关系映射到该类时遇到问题。
I've got a ParadaBus object, which represent a Bus Stop (in Spanish) and each one is identified by a integer and a String: 我有一个ParadaBus对象,它代表一个公共汽车站(西班牙语),并且每个对象都由一个整数和一个String标识:
public class ParadaBus implements Serializable {
private Integer id;
private String concesionRecogida;
......
@Override
public int hashCode() {
return this.id.hashCode() + this.concesionRecogida.hashCode();
}
@Override
public String toString() {
return "ParadaBus [" + id + " " + concesionRecogida + "]";
}
}
On the other hand, I've got another class which holds a single instance of a ParadaBus object: 另一方面,我还有另一个类,它包含一个ParadaBus对象的单个实例:
public class TrabajadorNombramiento implements Serializable {
...
private ParadaBus suParada;
...
}
I wanna map this relation with an XML HBM file, and I guess I'm doing incorrectly 我想将此关系与XML HBM文件映射,我想我做错了
This is the .hbm.xml file for ParadaBus: 这是ParadaBus的.hbm.xml文件:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"Hibernate Mapping 3.0"
"http://hibernate.org/dtd/hibernate-mapping-3.0.dtd" >
<hibernate-mapping>
<class name="com.ingartek.cavwebapp.model.ParadaBus" table="ParadasBus">
<composite-id >
<key-property name="id" type="integer">
<column name="id" />
</key-property>
<key-property name="concesionRecogida" type="string">
<column name="concesion_recogida" />
</key-property>
</composite-id>
...
</class>
</hibernate-mapping>
Up here, everything seems right. 在这里,一切似乎都正确。 The following snippet code represents the hbm.xml for the other class, where the relation to ParadaBus should be mapped:
以下代码段代表另一个类的hbm.xml,其中应映射与ParadaBus的关系:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"Hibernate Mapping 3.0"
"http://hibernate.org/dtd/hibernate-mapping-3.0.dtd" >
<hibernate-mapping>
<class name="com.ingartek.cavwebapp.model.TrabajadorNombramiento" table="nombramientos">
...
<many-to-one name="suParada" class="com.ingartek.cavwebapp.model.ParadaBus" cascade="none">
<column name="id_parada" />
<column name="concesion_recogida" />
</many-to-one>
...
</class>
</hibernate-mapping>
Am I doing something wrong? 难道我做错了什么?
Thanks for your help. 谢谢你的帮助。
EDIT: 编辑:
Eventually, I decided to use a UUID to identify each ParadaBus object/row. 最终,我决定使用UUID来标识每个ParadaBus对象/行。
the column name in the relationship isn't the same as the column name in the class mapping. 关系中的列名与类映射中的列名不同。
try: .hbm.xml file : 尝试:.hbm.xml文件:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"Hibernate Mapping 3.0"
"http://hibernate.org/dtd/hibernate-mapping-3.0.dtd" >
<hibernate-mapping>
<class name="com.ingartek.cavwebapp.model.ParadaBus" table="ParadasBus">
<composite-id >
<key-property name="id" type="integer">
<column name="id_parada" />
</key-property>
<key-property name="concesionRecogida" type="string">
<column name="concesion_recogida" />
</key-property>
</composite-id>
...
</class>
</hibernate-mapping>
hbm.xml for the other class: hbm.xml用于另一个类:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"Hibernate Mapping 3.0"
"http://hibernate.org/dtd/hibernate-mapping-3.0.dtd" >
<hibernate-mapping>
<class name="com.ingartek.cavwebapp.model.TrabajadorNombramiento" table="nombramientos">
...
<many-to-one name="suParada" class="com.ingartek.cavwebapp.model.ParadaBus" cascade="none">
<column name="id_parada" />
<column name="concesion_recogida" />
</many-to-one>
...
</class>
</hibernate-mapping>
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