Hibernate maps one-to-one affinity relationships

Foreign key-based approach:

Attached code:

　　

 Public classManager {PrivateInteger Mgrid; PrivateString Mgrname; PrivateDepartment Department;  PublicInteger Getmgrid () {returnMgrid; }     Public voidSetmgrid (Integer mgrid) { This. Mgrid =Mgrid; }     PublicString Getmgrname () {returnMgrname; }     Public voidsetmgrname (String mgrname) { This. Mgrname =Mgrname; }     PublicDepartment getdepartment () {returnDepartment; }     Public voidsetdepartment (Department Department) { This. Department =Department; }}

Manager class

 Public classDepartment {PrivateInteger DeptID; PrivateString Deptname; PrivateManager manager;  PublicInteger Getdeptid () {returnDeptID; }     Public voidSetdeptid (Integer deptid) { This. DeptID =DeptID; }     PublicString Getdeptname () {returnDeptname; }     Public voidsetdeptname (String deptname) { This. Deptname =Deptname; }     PublicManager GetManager () {returnManager; }     Public voidSetmanager (Manager manager) { This. Manager =Manager; }}

Department class

<hibernate-mapping>    <classname= "Hibernate.one2one.foreign.Department"Table= "Departments">        <IDname= "DeptID"type= "Java.lang.Integer">            <columnname= "dept_id" />            <Generatorclass= "Native" />        </ID>        < Propertyname= "Deptname"type= "Java.lang.String">            <columnname= "Dept_name" />        </ Property>        <Many-to-onename= "Manager"class= "Hibernate.one2one.foreign.Manager"Unique= "true"Fetch= "Join">            <columnname= "mgr_id"></column>        </Many-to-one>    </class></hibernate-mapping>

Department.hbm.xml

<hibernate-mapping>    <classname= "Hibernate.one2one.foreign.Manager"Table= "MANAGER">        <IDname= "Mgrid"type= "Java.lang.Integer">            <columnname= "mgr_id" />            <Generatorclass= "Native" />        </ID>        < Propertyname= "Mgrname"type= "Java.lang.String">            <columnname= "Mgr_name" />        </ Property>        <one-to-onename= "department"class= "Hibernate.one2one.foreign.Department"Fetch= "Select"Property-ref= "Manager">                </one-to-one>    </class></hibernate-mapping>

Manager.hbm.xml

where Department maps the Manager using Many-to-one, but needs to set a unique property set to true so that it can only point to one manager

The Manager uses one-to-one to map the Department, noting that a Property-ref property needs to be set because it is associated by default with the primary key in the Department table and needs to set which property it points to Department, note that The value set here is the value in the domain object, not the column name in the data table.

Hibernate maps one-to-one affinity relationships