我正在使用Hibernate和Spring MVC。我有以下表格
当我提交表单时,我希望我的数据库表格如下所示:
表名:学生
student_id studentName
1. Jason Stathum
表名:studentdetails
studentDetailsid FatherName MotherName city_id student_id
1 Mr.X Mrs. Y 1 1
但是当我实际运行我的应用程序并插入表单数据时,除了city_id
列没有填满之外,一切都很完美。该表如下所示:
表名:studentdetails
studentDetailsid FatherName MotherName city_id student_id
1 Mr.X Mrs. Y NULL 1
仅供参考,我还有一个名为city的表,如下所示
表名:studentdetails
city_ID city_name
1 NewYork
我在下面提供了我的代码,您能告诉我如何解决这个问题吗?
非常感谢
实体:学生
@Entity
@Table(name = "student")
public class Student {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name="student_id", nullable= false)
private Integer studentId;
private String studentName;
@OneToMany(cascade = CascadeType.ALL)
@JoinColumn(name="student_id", referencedColumnName="student_id")
private List<StudentDetails> studentDetails = new ArrayList<StudentDetails>();
// Getters and Setters
实体:学生详细信息
@Entity
@Table(name = "studentDetails")
public class StudentDetails {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Integer studentDetailsId;
private String FatherName;
private String MotherName;
@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name="city_id")
private City city;
// Getters and Setters
实体:城市
@Entity
@Table(name = "CITY")
public class City {
@Id
@Column(name="city_ID")
@GeneratedValue
private int cityId;
@Column(name="city_name")
private String cityName;
// Getters and Setters
控制器
@RequestMapping(value="addstudent", method = RequestMethod.GET)
public String addStudent(@ModelAttribute("secret") Student student, BindingResult result, Model map)
{
map.addAttribute("student", new Student());
List<City> myCities = subService.getCity();
map.addAttribute("city", myCities);
return "addStudent";
}
@RequestMapping(value="addstudent", method = RequestMethod.POST)
public String saveStudent(@ModelAttribute("secret") Student student, BindingResult result, Model map)
{
studentService.addStudent(student);
map.addAttribute("success", "Submitted");
return "msg";
}
StudentDaoImpl
Session session = getSessionFactory().openSession();
Transaction tx;
tx = session.beginTransaction();
session.save(student);
tx.commit();
我的表单:addStudent.jsp
<c:url var="saveUrl" value="/addstudent" />
<form:form modelAttribute="secret" method="POST" action="${saveUrl}">
<table>
<tr>
<td><form:label path="studentName">Student Name:</form:label></td>
<td><form:input path="studentName"/></td>
</tr>
<tr>
<td><form:label path="studentDetails[0].fatherName">Father Name:</form:label></td>
<td><form:input path="studentDetails[0].fatherName"/></td>
</tr>
<tr>
<td><form:label path="studentDetails[0].motherName">Mother Name:</form:label></td>
<td><form:input path="studentDetails[0].motherName"/></td>
</tr>
<tr>
<td><label>City</label></td>
<td><form:select path="studentDetails[0].city">
<c:forEach var="row" items="${city}">
<option value="${row.cityId}">${row.city}</option>
</c:forEach>
</form:select>
</td>
</tr>
</table>
<input type="submit" value="Save" />
</form:form>
答案 0 :(得分:0)
我在这里推测,但可能是你在输入唱片时没有真正选择一个城市,而只是输入了学生姓名,父亲姓名和母亲姓名,然后离开了城市显示在您列表中的第一个城市,恰好是#34;纽约&#34;。也许你可以添加额外的&#34;请选择&#34;选项,带有强制您选择城市的验证器。
另外,我注意到你在某些地方使用city_id而在其他地方使用city_ID。您的数据库是否对列名称不区分大小写?
答案 1 :(得分:0)
我设法解决了这个问题:)我在HTML表单中进行了一些更改,现在它正在运行。
<tr>
<td><label>City</label></td>
<td><form:select path="studentDetails[0].city.cityId">
<c:forEach var="row" items="${city}">
<option value="${row.cityId}">${row.cityName}</option>
</c:forEach>
</form:select>
</td>
</tr>