Question

似乎当我使用jpa merge更新现有实体时，它会插入具有相同id的实体，而不是更新预期的现有实体。因为插入后，数据库行顺序丢失了。但我仍然有相同的ID具有相同的实体，Jpa是否使用插入来更新？我的意思是它删除现有实体并再次插入更新值以执行其更新作业。主要混乱是数据库顺序丢失。

这是我的监听器方法：userService是我使用JPA中的EJB类。

public void onEditUserOrganization(RowEditEvent event){
    UserOrganization uorg =(UserOrganization) event.getObject();
    try {

    userService.updateUserOrganization(uorg);

    } catch (UserException ex) {
        ex.printStackTrace();
        FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("error)"));
    }finally{
        parentlist = getUserOrganizationParents();
        branchlist = getUserOrganizationBranches();
    }
}

这是我的主要更新方法

    @Override
public void updateUserOrganization(UserOrganization org) throws UserException{
    if(org != null && !em.contains(org)){
    try{

        UserOrganization existing = em.find(UserOrganization.class, org.getUorgId());
        existing.setOrgcode(org.getOrgcode());
        existing.setOrgname(org.getOrgname());
        existing.setParent(org.getParent());


    }catch(Exception e){
    throw new UserException("Couldn't update user org with id " + org.getUorgId());
    }
    }
}

这是我的实体类：

public class UserOrganization implements Serializable {

private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@NotNull
@Column(name = "uorg_id", nullable = false)
private Integer uorgId;
@Basic(optional = false)
@NotNull
@Column(name = "parent", nullable = false)
private short parent;
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 10)
@Column(name = "orgcode", nullable = false, length = 10)
private String orgcode;
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 150)
@Column(name = "orgname", nullable = false, length = 150)
private String orgname;
@OneToMany(cascade = CascadeType.ALL, mappedBy = "uorgId")
private List<refMain> refList;
@OneToMany(cascade = CascadeType.ALL, mappedBy = "uorgId")
private List<User1> user1List;
@OneToMany(cascade = CascadeType.ALL, mappedBy = "userOrganization")
private List<Bankrelation> relationList;


public UserOrganization() {
}

//getter setters..
    @Override
public boolean equals(Object object) {
    // TODO: Warning - this method won't work in the case the id fields are not set
    if (!(object instanceof UserOrganization)) {
        return false;
    }
    UserOrganization other = (UserOrganization) object;
    if ((this.uorgId == null && other.uorgId != null) || (this.uorgId != null && !this.uorgId.equals(other.uorgId))) {
        return false;
    }
    return true;
}

@Override
public String toString() {
    return "mn.bs.crasmon.model.UserOrganization[ uorgId=" + uorgId + " ]";
}

在JPA中进行更新的最佳方法是什么

JPA合并确实插入新实体而不是更新现有实体

0 个答案: