(对不起,如果这是一个新问题)
我有两个 JPAContainer,一个用于 Employee 类/表,一个用于 Language 类/表。员工可以使用选定的语言。
我正在尝试创建一个员工编辑表单,其中包含一个用于语言选择和 FieldGroup 的组合框来处理绑定和创建。
我可以通过 JPAContainer 获取下拉菜单以包含 Languages 表中的条目,但它不会显示 Employee 记录中已经存在的值。我究竟做错了什么?
//Key parts of code....
private JPAContainer<Employee> employees;
private JPAContainer<Language> languages;
FormLayout formLayout = new FormLayout();
formFieldGroup = new FieldGroup(employeeItem);
Field<?> firstName = formFieldGroup.buildAndBind("First name", "firstName");
Field<?> lastName = formFieldGroup.buildAndBind("Last name", "lastName");
Field<?> userName = formFieldGroup.buildAndBind("Username", "userName");
Field<?> fullName = formFieldGroup.buildAndBind("Full name", "fullName");
Field<?> initials = formFieldGroup.buildAndBind("Initials", "initials");
ComboBox language = new ComboBox("Language",languages);
language.setContainerDataSource(languages);
language.setItemCaptionPropertyId("languageName");
language.setFilteringMode(FilteringMode.CONTAINS);
language.setImmediate(true);
formFieldGroup.bind(language, "language");
firstName.addValidator(new BeanValidator(Employee.class, "firstName"));
lastName.addValidator(new BeanValidator(Employee.class, "lastName"));
firstName.addValidator(new BeanValidator(Employee.class, "userName"));
lastName.addValidator(new BeanValidator(Employee.class, "fullName"));
lastName.addValidator(new BeanValidator(Employee.class, "initials"));
formLayout.addComponent(userName);
formLayout.addComponent(fullName);
formLayout.addComponent(firstName);
formLayout.addComponent(lastName);
formLayout.addComponent(initials);
formLayout.addComponent(language);
// A few details of the domain classes
@Entity
@Table(name="Employees")
public class Employee extends BaseEntity
{
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name="EmployeeID")
private Integer employeeID;
...
@ManyToOne
@JoinColumn(name="LanguageID",updatable=false)
private Language language;
...}
@Entity
@Table(name="Languages")
public class Language extends BaseEntity
{
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name="LanguageID")
private Integer languageID;
@Column(name="LangaugeName")
private String languageName;
... }