Question

我正在使用与共享主键的一对一映射。

我的映射类似于 -

<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>

在Employee.hbm.xml中我有

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

我刚设置employee.setEmployeeDetails(new EmployeeDetails(score)); 并试图挽救员工。触发的查询是更新查询，但EMPLOYEE_DETAILS表中没有记录。我想要插入它。我怎样才能做到这一点？如果我使用cascade cascade =“save-update”我没有收到任何错误。如果我使用cascade =“save-update”我收到错误No row with the given identifier exists 但两次都只会触发更新查询。

Answer 1

我能够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);

关键是当employeeDetails存在于db（以及Employee对象中）时，只需更新属性，当它不仅设置employee对象时，hibernate将负责插入从employee对象中获取的正确id。

Hibernate一对一映射错误

1 个答案: