Spring Hibernate一對一關系在子表上創建新記錄，而不是更新

Question

我是Spring的新手，仍然在學習Hibernate一對一關系。 我有一個問題，每當更新特定記錄時，它都會為子表創建一個新記錄，並且所有者表中的外鍵也會更新。 我期望的是兩個聯接表的記錄只會更新。

以下是一些代碼：

Employee.java

public class Employee implements Serializable {

private static final long serialVersionUID = -3465813074586302847L;

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int empId;

@Column
private String name;

@Column
private String email;

@Column
private String address;

@Column
private String telephone;

@OneToOne(cascade = CascadeType.ALL)
@JoinColumn(name="empUserId")
private EmployeeUserAccount employeeUserAccount;

//getters and setters

EmployeeUserAccount.java

public class EmployeeUserAccount implements Serializable {

private static final long serialVersionUID = -3465813074586302847L;

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int empUserId;

@Column
private String userName;

@Column
private String password;

@Column
private String userLevel;

@OneToOne(mappedBy="employeeUserAccount")
private Employee employee;

//getters and setters

EmployeeDAOImpl.java

public class EmployeeDAOImpl implements EmployeeDAO {

@Override
public Employee updateEmployee(Employee employee) {
    sessionFactory.getCurrentSession().update(employee);
    return employee;
}

EmployeeController.java

public class EmployeeController {

@RequestMapping(value = "/saveEmployee", method = RequestMethod.POST)
public ModelAndView saveEmployee(@ModelAttribute("command") Employee employee) {
    if (employee.getEmpId() == 0) {
        employeeService.addEmployee(employee);
    } else {
        employeeService.updateEmployee(employee);
    }
    return new ModelAndView("redirect:/");
}

EmployeeForm.jsp

<body>
<div align="center">
    <h1>New/Edit Employee</h1>
    <form:form action="saveEmployee" method="post" >
    <table>
        <form:hidden path="empId"/>
        <tr>
            <td>Name:</td>
            <td><form:input path="name" value="${employee.name}"/></td>
        </tr>
        <tr>
            <td>Email:</td>
            <td><form:input path="email" value="${employee.email}"/></td>
        </tr>
        <tr>
            <td>Address:</td>
            <td><form:input path="address" value="${employee.address}"/></td>
        </tr>
        <tr>
            <td>Telephone:</td>
            <td><form:input path="telephone" value="${employee.telephone}"/></td>
        </tr>
        <tr>
            <td>Username:</td>
            <td><form:input path="employeeUserAccount.userName" value="${employee.employeeUserAccount.userName}"/></td>
        </tr>
        <tr>
            <td>Password:</td>
            <td><form:input path="employeeUserAccount.password"  value="${employee.employeeUserAccount.password}"/></td>
        </tr>
        <tr>
            <td>Role:</td>
            <td>
                <form:select path="employeeUserAccount.userLevel">
                <c:forEach items="${role}" var="r">
                    <c:choose>
                        <c:when test="${r==employee.employeeUserAccount.userLevel}">
                            <option value="${r}" selected="true">${r}</option>
                        </c:when>
                        <c:otherwise>
                            <option value="${r}">${r}</option>
                        </c:otherwise>
                    </c:choose>
                </c:forEach>
                </form:select>
            </td>
        </tr>
        <tr>
            <td colspan="2" align="center"><input type="submit" value="Save"></td>
        </tr>
    </table>
    </form:form>
</div>

場景：

最初，tbl_employee中的empUserId列為1，該列鏈接到tbl_employee_user_account的第一條記錄。 更新名稱（從name1到new-name1）后，tbl_employee_user_account創建ID為2的新記錄，並且tbl_employee中的empUserId更改為2。

mysql> select * from tbl_employee;
 +-------+----------+--------+-----------+-----------+----------+
| empId | address  | email  | name      | telephone | empUserId |
+-------+----------+--------+-----------+-----------+-----------+
|     1 | address1 | email1 | new-name1 | tele1     |         2 |
+-------+----------+--------+-----------+-----------+-----------+

mysql> select * from tbl_employee_user_account;
+-----------+----------+-----------+-----------+----------+
| empUserId | employee | password  | userLevel | userName |
+-----------+----------+-----------+-----------+----------+
|         1 | NULL     | password1 | Admin     | user1    |
|         2 | NULL     | password1 | Admin     | user1    |
+-----------+----------+-----------+-----------+----------+

Answer 1

讓自己陷入休眠狀態。 系統要求您更新員工。 該員工由一個ID標識，並具有一個新的名稱，新的地址等，並且還有一個新的用戶帳戶，而不是原來的舊用戶帳戶，該帳戶已經由ID標識。 新的沒有任何ID。 因此，它不可能與舊帳戶相同。 因此，Hibernate只是按照其指示去做：用一個新的雇員帳戶代替該雇員的帳戶。

Spring Hibernate一對一關系在子表上創建新記錄，而不是更新

問題描述

1 個解決方案

解決方案1
-1 2017-06-29 07:05:47

Spring Hibernate一對一關系在子表上創建新記錄，而不是更新

問題描述

1 個解決方案

解決方案1 -1 2017-06-29 07:05:47

解決方案1
-1 2017-06-29 07:05:47