Hibernate one-to-one 共享主键
在项目中由于业务原因要对数据库中一个表做扩展，由于扩展的内容比较多，于是新建了一张表，表旧表做一对一关联，共享其旧表的主键。
贴出个小例子供自己备忘使用
我们这里用的是表名称：basic表和extend表
Basic.java 和Basic.hbm.xm如下
package com.sszd.hibernate;
publicclassBasic{
privateintid;
privateStringfeilda;
privateExtendextend;
publicExtendgetExtend(){
returnextend;
}
publicvoidsetExtend(Extendextend){
this.extend=extend;
}
publicintgetId(){
returnid;
}
publicvoidsetId(intid){
this.id=id;
}
publicStringgetFeilda(){
returnfeilda;
}
publicvoidsetFeilda(Stringfeilda){
this.feilda=feilda;
}
}<?xml version="1.0"?>
<!DOCTYPEhibernate-mappingPUBLIC
"-//Hibernate/HibernateMappingDTD3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<classname="com.sszd.hibernate.Basic"table="basic">
<idname="id"column="id">
<generatorclass="native"/>
</id>
<propertyname="feilda"column="feilda"type="string"/>
<!--cascade表示级联关系,extend伴随着basic的操作面操作-->
<one-to-onename="extend"class="com.sszd.hibernate.Extend"cascade="all"></one-to-one>
</class>
</hibernate-mapping>Extend.java和Extend.hbm.xml
package com.sszd.hibernate;
publicclassExtend{
privateintid;
privateStringfeilda;
privateBasicbasic;
publicBasicgetBasic(){
returnbasic;
}
publicvoidsetBasic(Basicbasic){
this.basic=basic;
}
publicintgetId(){
returnid;
}
publicvoidsetId(intid){
this.id=id;
}
publicStringgetFeilda(){
returnfeilda;
}
publicvoidsetFeilda(Stringfeilda){
this.feilda=feilda;
}
}<?xml version="1.0"?>
<!DOCTYPEhibernate-mappingPUBLIC
"-//Hibernate/HibernateMappingDTD3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mappingpackage="com.sszd.hibernate">
<classname="com.sszd.hibernate.Extend"table="extend">
<idname="id"column="id">
<generatorclass="foreign">
<paramname="property">basic</param>
</generator>
</id>
<propertyname="feilda"column="feilda"/>
<one-to-onename="basic"class="com.sszd.hibernate.Basic"constrained="true"></one-to-one>
</class>
</hibernate-mapping>