请问该如何解决这个问题啊?有人能回答不?
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客户端调用代码:UserClient.java
.......
com.test.dataBase.User user=new com.test.database.User();
//注意这里没有对User的其他字段进行set
user.setUserId(userId);
user.setLoginName(userName);
user.setLoginPass(loginPass);
UserFacadeRemote userRemote=null;
try
{
//这里是接口的调用,都是一样的,就不详细些了,浪费时间
........} catch (LeasingErrorException e)
{
throw new ServletException(e);
}
userRemote.update(user);//后面是其他无关紧要的代码也省略了。
.......服务器端代码:package com.test.database;import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;/**
* User generated by MyEclipse Persistence Tools
*/
@Entity
@Table(name = "User", catalog = "leasing", uniqueConstraints = {})
public class User implements java.io.Serializable {// Fieldsprivate String userId;
private String employeeNo;
private String departId;
private String userName;
private String loginName;
private String loginPass;
private String email;
private String phoneNum;
private int status;
private String module;
private String visitMode;
private String levelid;
private String posts;// Constructors/** default constructor */
public User() {
}/** minimal constructor */
public User(String userId, String employeeNo, String departId,
String loginName, int status) {
this.userId = userId;
this.employeeNo = employeeNo;
this.departId = departId;
this.loginName = loginName;
this.status = status;
}/** full constructor */
public User(String userId, String employeeNo, String departId,
String userName, String loginName, String loginPass, String email,
String phoneNum, int status, String module, String visitMode,
String levelid, String posts) {
this.userId = userId;
this.employeeNo = employeeNo;
this.departId = departId;
this.userName = userName;
this.loginName = loginName;
this.loginPass = loginPass;
this.email = email;
this.phoneNum = phoneNum;
this.status = status;
this.module = module;
this.visitMode = visitMode;
this.levelid = levelid;
this.posts = posts;
}// Property accessors
@Id
@Column(name = "UserID", unique = true, nullable = false, insertable = true, updatable = true, length = 10)
public String getUserId() {
return this.userId;
}public void setUserId(String userId) {
this.userId = userId;
}@Column(name = "employeeNo", unique = false, nullable = false, insertable = true, updatable = true, length = 10)
public String getEmployeeNo() {
return this.employeeNo;
}public void setEmployeeNo(String employeeNo) {
this.employeeNo = employeeNo;
}@Column(name = "DepartID", unique = false, nullable = false, insertable = true, updatable = true, length = 10)
public String getDepartId() {
return this.departId;
}public void setDepartId(String departId) {
this.departId = departId;
}@Column(name = "UserName", unique = false, nullable = true, insertable = true, updatable = true, length = 20)
public String getUserName() {
return this.userName;
}public void setUserName(String userName) {
this.userName = userName;
}@Column(name = "LoginName", unique = false, nullable = false, insertable = true, updatable = true, length = 10)
public String getLoginName() {
return this.loginName;
}public void setLoginName(String loginName) {
this.loginName = loginName;
}@Column(name = "LoginPass", unique = false, nullable = true, insertable = true, updatable = true, length = 10)
public String getLoginPass() {
return this.loginPass;
}public void setLoginPass(String loginPass) {
this.loginPass = loginPass;
}@Column(name = "EMail", unique = false, nullable = true, insertable = true, updatable = true, length = 50)
public String getEmail() {
return this.email;
}public void setEmail(String email) {
this.email = email;
}@Column(name = "PhoneNum", unique = false, nullable = true, insertable = true, updatable = true, length = 20)
public String getPhoneNum() {
return this.phoneNum;
}public void setPhoneNum(String phoneNum) {
this.phoneNum = phoneNum;
}@Column(name = "Status", unique = false, nullable = false, insertable = true, updatable = true)
public int getStatus() {
return this.status;
}public void setStatus(int status) {
this.status = status;
}@Column(name = "Module", unique = false, nullable = true, insertable = true, updatable = true, length = 100)
public String getModule() {
return this.module;
}public void setModule(String module) {
this.module = module;
}@Column(name = "VisitMode", unique = false, nullable = true, insertable = true, updatable = true, length = 10)
public String getVisitMode() {
return this.visitMode;
}public void setVisitMode(String visitMode) {
this.visitMode = visitMode;
}@Column(name = "levelid", unique = false, nullable = true, insertable = true, updatable = true, length = 10)
public String getLevelid() {
return this.levelid;
}public void setLevelid(String levelid) {
this.levelid = levelid;
}@Column(name = "posts", unique = false, nullable = true, insertable = true, updatable = true, length = 10)
public String getPosts() {
return this.posts;
}public void setPosts(String posts) {
this.posts = posts;
}}package com.test.database;import java.util.List;
import java.util.logging.Level;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
session bean 类的代码:UserFacadeRemote.java@Stateless
public class UserFacade implements UserFacadeRemote
{@PersistenceContext
private EntityManager entityManager;
public User update(User entity)
{try
{
User result = entityManager.merge(entity);return result;
} catch (RuntimeException re)
{throw re;
}
}
}接口类太简单,也就不写了, 在UserClient.java中。我只对User的userName和loginPass进行了赋值(userId是主键),而此时数据库中User表的其他字段均是由值的,在update完成以后数据库中除了userName和loginPass有值(就是我刚刚set的值),其他字段的值都成了null(空)(我原本是想保持这些之字段短的值不变,只更新userName和loginPass),很麻烦,大家帮我看下是什么问题