EmployeeInfo 實(shí)體類@Entity@Table(name = "employeeinfo")public class EmployeeInfo{@Id@GeneratedValue(strategy = GenerationType.IDENTITY)@Column(name = "id")private Long id;@Column(name = "employeeId")private String employeeId;@Column(name = "firstName")private String firstName;@Column(name = "middleName")private String middleName;@Column(name = "lastName")private String lastName;......}另一個實(shí)體類 ProjectTaskComments@Entity@Table(name = "projecttaskcomments")public class ProjectTaskComments{ @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @Basic(optional = false) @Column(name = "id") private Long id; @Basic(optional = false) @Column(name = "comments") private String comments; @Basic(optional = false) @Column(name = "commentTime") @Temporal(TemporalType.TIMESTAMP) private Date commentTime; @Column(name = "fkCommentedBy") private Long fkCommentedBy; @Transient @JsonIgnoreProperties private EmployeeInfo commentedEmployee; @Transient @Autowired EmployeeInfoService employeeInfoService; public EmployeeInfo getCommentedEmployee() { EmployeeInfo employeeInfo; employeeInfo = employeeInfoService.getSingleEmployeeInfoByFkUserId(this.fkCommentedBy); if(employeeInfo != null) { this.commentedEmployee.setEmployeeId(employeeInfo.getEmployeeId()); this.commentedEmployee.setFirstName(employeeInfo.getFirstName()); this.commentedEmployee.setMiddleName(employeeInfo.getMiddleName()); this.commentedEmployee.setLastName(employeeInfo.getLastName()); this.commentedEmployee.setPhoto(employeeInfo.getPhoto()); return commentedEmployee; } else { return null; } }}我試圖通過 fkCommentedBy 屬性在 getCommentedEmployee() 方法中找到一個 EmployeeInfo 對象，并將其設(shè)置為 @Transient 屬性 commentedEmployee。我該如何解決？
3 回答
翻翻過去那場雪
TA貢獻(xiàn)2065條經(jīng)驗(yàn) 獲得超14個贊
目的是為一個非持久屬性建模，所以我不清楚為什么當(dāng)你通過“fkCommentedBy”屬性持久化它時，你為什么要在 commentedByEmployee 屬性上使用 @Transient。IMO，@ManyToOne 在這種情況下更合適。
@Entity
@Table(name = "projecttaskcomments")
public class ProjectTaskComments {
// .... other declarations
@ManyToOne
@JoinColumn(name="fkCommentedBy")
private EmployeeInfo commentedEmployee;
// ..... other code
}
現(xiàn)在，如果您仍然想使用@Transient，那么在 getter 方法中，您需要確保您擁有對 EmployeeInfoService 對象的有效引用。@Autowired 在這里不起作用，因?yàn)?ProjectTaskComments 不是 spring 管理的 bean。
HUH函數(shù)
TA貢獻(xiàn)1836條經(jīng)驗(yàn) 獲得超4個贊
需要檢查 null 并進(jìn)行一些初始化：
public EmployeeInfo getCommentedEmployee() {
// check here
if (employeeInfoService == null) return null;
EmployeeInfo employeeInfo = employeeInfoService.getSingle...;
if (employeeInfo != null) {
// init here
commentedEmployee = new EmployeeInfo();
commentedEmployee.set...;
return commentedEmployee;
} else {
return null;
}
}
private void setCommentedEmployee(EmployeeInfo employeeInfo) {
// do nothing
}
弒天下
TA貢獻(xiàn)1818條經(jīng)驗(yàn) 獲得超8個贊
是的，我終于可以解決它了。我只是做了以下工作：
將 @Component 添加到 ProjectTaskComments 類：
@Entity
@Component
@Table(name = "projecttaskcomments")
public class ProjectTaskComments{
........
將 EmployeeInfoService 聲明為靜態(tài)并為該服務(wù)添加了一個 seter 方法并@Autowired 它。
@Transient
private static EmployeeInfoService employeeInfoService;
@Autowired
public void setEmployeeInfoService(EmployeeInfoService employeeInfoService) {
this.employeeInfoService = employeeInfoService;
}
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