Hibernate一对一映射错误

Question

我正在使用与共享主键一对一映射。

<class name="EmployeeDetails" table="EMPLOYEE_DETAILS" >
    <cache usage="nonstrict-read-write"/> 
    <id name="employeeId" type="java.lang.Long">
        <column name="EMPLOYEE_ID" precision="12" scale="0" />
        <generator class="foreign">
            <param name="property">employee</param>
        </generator>
    </id>
    <property name="score" type="java.math.BigDecimal" update="true">
        <column name="SCORE" />
    </property>
    <one-to-one name="employee" class="Employee" constrained="true"/>
</class>

    <one-to-one name="employeeDetails" class="EmployeeDetails" cascade="all,delete-orphan"></one-to-one>

Answer 1

我可以像下面这样解决这个问题-

        EmployeeDetails employeeDetails= employee.getEmployeeDetails();

        if(employeeDetails!= null){
            employeeDetails.setScore(statusVO.getScore());
        }
        else {
            employeeDetails = new EmployeeDetails(statusVO.getScore());
            employeeDetails.setEmployee(employee);
        }
        employeeDetailsService.saveOrUpdate(employeeDetails);

关键在于，当employeeDetails存在于db（以及Employee object）中时，只需更新属性，当它不设置Employee object时，hibernate将使用从Employee object中提取的正确id进行插入。