为什么实体 bean 字段 (java.util.Date) 在更新后更改值
Why Entity bean field (java.util.Date) changes value after an update
我有一个实体 bean“用户”，它有一个 java.util.Date 字段。当我出于某种奇怪的原因更新 JSF 页面上的任何用户字段（即 phone 号码、公司名称等）时，数据库中日期字段的值发生变化。我的开发环境是 Windows10.
上的 Netbeans 12.0、EclipseLink JPA、Apache Derby DB 和 GlassFish 5.1
例如，当我添加一个出生日期为“1980-08-20”的用户 (Bob) 时，JSF 为 Bob 的用户实体设置值“1/20/80 3:38 AM”，此外，没有无论一天中的什么时间，我都会向用户添加“3:38 AM”是始终附加到日期的固定时间。稍后，当我从数据库中检索 Bob 并在 JSF 页面上显示其信息时，他的出生日期如预期的那样是“1980-08-20”。如果我更新 Bob 的任何字段（即 phone 数字），出生日期值“1/20/80 3:38 AM”将发送到处理更新的会话 Bean LoginRequestSessionBean（我验证了它通过调试器）。更新成功完成后，我从数据库中检索 Bob 并显示在 JSF 页面上，然后 Bob 的出生日期是“1/20/80 12:00 AM”而不是“1/20/80 3:38 AM”，因此我看到“1980-30-19”而不是“1980-08-20”？任何的想法？
这是将 Bob 添加到系统时的 SQL 日志：
INSERT INTO PERSISTENCE_USER (ID, CELLPHONE, COMPANY, DATEOFBIRTH, FIRSTNAME, LASTNAME, OFFICEPHONE, PASSWORD, USERID, USERROLE) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
bind => [5, (910)-509-3924, IBM, 1980-01-20, Bob, Nittelo, (818)-456-9012, password, Bobnitello, consumer]]]
这是更新 Bob 时的 SQL 日志
UPDATE PERSISTENCE_USER SET USERROLE = ?, CELLPHONE = ?, DATEOFBIRTH = ?, LASTNAME = ?, USERID = ?, FIRSTNAME = ?, OFFICEPHONE = ?, COMPANY = ? WHERE (ID = ?)
bind => [consumer, (910)-509-3924, 1980-01-20, Nittelo, Bobnitello, Bob, (818)-456-9011, IBM, 5]]]
我有一个显示所有用户并允许更新用户信息的 JSF 页面。还有另一个 JSF 页面允许将用户添加到系统。这是源代码：
@NamedQuery(
name = "updateUser",
query = "UPDATE User u SET u.userId=?1, u.userRole=?2, u.cellPhone=?3, u.company=?4, "
+ "u.dateOfBirth=?5, u.firstName=?6, u.lastName=?7, u.officePhone=?8 "
+ "WHERE u.id = ?9"
)
public class User implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
@NotNull
private String userId;
@NotNull
private String password;
@NotNull
private String userRole;
@NotNull
private String firstName;
@NotNull
private String lastName;
@Temporal(TemporalType.DATE)
private Date dateOfBirth;
@NotNull
private String officePhone;
private String cellPhone;
@NotNull
private String company;
............
}
这是class与数据库交互
Stateless
public class LoginRequestSessionBean {
public void addUser(User u) throws ListServiceException {
try {
em.persist(u);
} catch (Exception e) {
throw (ExceptionHandler.wrapException(
e, logger,
"Error occured when adding a user "+u.getUserId()));
}
}
public void removeUser(User u) throws ListServiceException{
try{
if(!em.contains(u)){
u = em.merge(u);
}
em.remove(u);
} catch (Exception e) {
throw (ExceptionHandler.wrapException(e, logger,"Error occured while removing a user");
}
}
public void updateUser(User u) throws ListServiceException{
try {
updatedRow = em.createNamedQuery("updateUser")
.setParameter(1, u.getUserId())
.setParameter(2, u.getUserRole())
.setParameter(3, u.getCellPhone())
.setParameter(4, u.getCompany())
.setParameter(5, u.getDateOfBirth())
.setParameter(6, u.getFirstName())
.setParameter(7, u.getLastName())
.setParameter(8, u.getOfficePhone())
.setParameter(9, u.getId())
.executeUpdate();
} catch (Exception e) {
throw ExceptionHandler.wrapException(e, logger, "Error occured while updating user");
}
}
public User getUser(Long id) throws ListServiceException{
User user;
try {
user = em.find(User.class, id);
} catch (Exception e) {
throw ExceptionHandler.wrapException(e,logger,"Error occured in"+className+".getuser()");
}
return user;
}
}
这是处理日期列的更新 JSF 页面的相关部分
<h:column>
<f:facet name="header">#{bundle.loginmanagementdob}</f:facet>
<h:inputText
p:type="date"
value = "#{l.dateOfBirth}"
size ="15" rendered = "#{l.canUpdate}" >
<f:convertDateTime type="date"
pattern = "yyyy-mm-dd" />
</h:inputText>
<h:outputText value = "#{l.dateOfBirth}"
rendered = "#{not l.canUpdate}" >
<f:convertDateTime
type="date"
pattern = "yyyy-mm-dd" />
</h:outputText>
</h:column>
<h:column>
<f:facet name = "header">Update</f:facet>
<h:commandLink value = "Update"
disabled="#{login.currentUser.userRole == 'delete' or login.currentUser.userRole == 'consumer'}"
action = "#{loginManagment.updateLinkAction(l)}"
rendered = "#{not l.canUpdate}">
</h:commandLink>
</h:column>
<f:facet name="footer">
<h:panelGroup style="display: block; border-color: aquamarine;text-align: center;">
<h:commandButton id="update"
tabindex="1"
value="Save updates"
action="#{loginManagment.saveUpdate}" />
</h:panelGroup>
</f:facet>
这是 JSF 页面的托管 bean：
@Named
@SessionScoped
public class LoginManagment implements Serializable {
private static final long serialVersionUID = 1009L;
private LoginRequestSessionBean request;
private final ResourceBundle bundle; //application resource bundle
public LoginManagment() {
//Get the application's resource bundle
bundle = ResourceBundle.getBundle("webmessages");
}
public List<User> getUsers() {
if ((users == null) || refresh) {
try {
users = request.getUsers();
} catch (EJBException e) {
FacesMessage errMsg = new FacesMessage(e.getMessage());
FacesContext.getCurrentInstance().addMessage(null, errMsg);
}
refresh = false;
}
return users;
}
public void resetUpdateLink() {
users
.stream()
.filter(e -> e.getCanUpdate() == true)
.forEach(e -> e.setCanUpdate(false));
}
public String updateLinkAction(User u) {
u.setCanUpdate(true);
return null;
}
public String saveUpdate() {
Function<User, User> update = n -> {
request.updateUser(n);
return n;
};
try {
users
.stream()
.filter(e -> e.getCanUpdate() == true)
.forEach(update);
resetUpdateLink();
FacesMessage msg = new FacesMessage(bundle.getString("loginmanagementupdatesuccess"));
FacesContext.getCurrentInstance().addMessage(null, msg);
} catch (ListServiceException e) {
FacesMessage errMsg = new FacesMessage(e.getMessage());
FacesContext.getCurrentInstance().addMessage(null, errMsg);
}
logger.exiting(className, "saveUpdate()");
return null;
}
}
这是处理日期字段的添加用户 JSF 页面的相关部分：
<h:outputLabel id="adddoblabel"
for="adduserdob"
style="color: green; font: caption; font-size: large;
font-family: cursive; border-color: aquamarine"
value="#{bundle.adduserdob}" />
<h:inputText id="adduserdob"
p:type="date"
label="Date Of Birth "
title="Date Of Birth"
style="border-color: aquamarine"
value="#{addUser.dateOfBirth}"
required="true"
requiredMessage="#{bundle.adduserdoberror}"
maxlength="30" >
<f:convertDateTime type="date"
pattern = "yyyy-mm-dd" />
</h:inputText>
<f:facet name="footer">
<h:panelGroup style="display: block; border-color: aquamarine;text-align: center;">
<h:commandButton id="addusercommandbutton"
value="Add"
immediate="false"
style="font-size: large; font-family: cursive"
action="#{addUser.addAction}">
</h:commandButton>
</h:panelGroup>
</f:facet>
</h:panelGrid>
这是 JSF 添加用户页面的托管 bean：
@Named
@SessionScoped
public class AddUser implements Serializable {
private static final long serialVersionUID = 1100L;
private String firstName;
private String lastName;
private Date dateOfBirth;
@EJB
private LoginRequestSessionBean request;
private ResourceBundle bundle; //application resource bundle
public AddUser() {
bundle = ResourceBundle.getBundle("webmessages");
}
public Date getDateOfBirth() {
return dateOfBirth;
}
public void setDateOfBirth(Date date){
dateOfBirth=date;
}
private void clearDataField() {
this.password = null;
this.userId = null;
this.role = null;
this.cellPhone = null;
this.officePhone = null;
this.company = null;
this.dateOfBirth = null;
this.firstName = null;
this.lastName = null;
}
public void addAction() {
try {
User u = new User(getUserId(), getPassword(), getRole(), getFirstName(), getLastName()
,getDateOfBirth(), getOfficePhone(),getCellPhone(),getCompany());
request.addUser(u);
clearDataField();
FacesMessage successMsg = new FacesMessage(bundle.getString("addusersuccess"));
FacesContext.getCurrentInstance().addMessage(null, successMsg);
} catch (EJBException e) {
FacesMessage successMsg = new FacesMessage(e.getMessage());
FacesContext.getCurrentInstance().addMessage(null, successMsg);
}
}
}
这是因为您已将日期转换器配置为将连字符之间的部分解释为分钟。
<f:convertDateTime type="date" pattern="yyyy-mm-dd" />
根据 its documentation the pattern symbols are specified in the documentation of java.text.SimpleDateFormat. This documentation says，您应该使用 M 几个月。
Letter
Date or time component
Presentation
Examples
M
Month in year (context sensitive)
Month
July; Jul; 07
m
Minute in hour
Number
30
因此，相应地调整模式：
<f:convertDateTime type="date" pattern="yyyy-MM-dd" />
与具体问题无关：指定pattern 属性时忽略type 属性。下面的声明同样可以。
<f:convertDateTime pattern="yyyy-MM-dd" />
这在its documentation中也有规定。
If a pattern has been specified, its syntax must conform the rules specified by java.text.SimpleDateFormat. Such a pattern will be used to parse, and the type, dateStyle, and timeStyle properties will be ignored.
我有一个实体 bean“用户”，它有一个 java.util.Date 字段。当我出于某种奇怪的原因更新 JSF 页面上的任何用户字段（即 phone 号码、公司名称等）时，数据库中日期字段的值发生变化。我的开发环境是 Windows10.
上的 Netbeans 12.0、EclipseLink JPA、Apache Derby DB 和 GlassFish 5.1例如，当我添加一个出生日期为“1980-08-20”的用户 (Bob) 时，JSF 为 Bob 的用户实体设置值“1/20/80 3:38 AM”，此外，没有无论一天中的什么时间，我都会向用户添加“3:38 AM”是始终附加到日期的固定时间。稍后，当我从数据库中检索 Bob 并在 JSF 页面上显示其信息时，他的出生日期如预期的那样是“1980-08-20”。如果我更新 Bob 的任何字段（即 phone 数字），出生日期值“1/20/80 3:38 AM”将发送到处理更新的会话 Bean LoginRequestSessionBean（我验证了它通过调试器）。更新成功完成后，我从数据库中检索 Bob 并显示在 JSF 页面上，然后 Bob 的出生日期是“1/20/80 12:00 AM”而不是“1/20/80 3:38 AM”，因此我看到“1980-30-19”而不是“1980-08-20”？任何的想法？
这是将 Bob 添加到系统时的 SQL 日志：
INSERT INTO PERSISTENCE_USER (ID, CELLPHONE, COMPANY, DATEOFBIRTH, FIRSTNAME, LASTNAME, OFFICEPHONE, PASSWORD, USERID, USERROLE) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
bind => [5, (910)-509-3924, IBM, 1980-01-20, Bob, Nittelo, (818)-456-9012, password, Bobnitello, consumer]]]
这是更新 Bob 时的 SQL 日志
UPDATE PERSISTENCE_USER SET USERROLE = ?, CELLPHONE = ?, DATEOFBIRTH = ?, LASTNAME = ?, USERID = ?, FIRSTNAME = ?, OFFICEPHONE = ?, COMPANY = ? WHERE (ID = ?)
bind => [consumer, (910)-509-3924, 1980-01-20, Nittelo, Bobnitello, Bob, (818)-456-9011, IBM, 5]]]
我有一个显示所有用户并允许更新用户信息的 JSF 页面。还有另一个 JSF 页面允许将用户添加到系统。这是源代码：
@NamedQuery(
name = "updateUser",
query = "UPDATE User u SET u.userId=?1, u.userRole=?2, u.cellPhone=?3, u.company=?4, "
+ "u.dateOfBirth=?5, u.firstName=?6, u.lastName=?7, u.officePhone=?8 "
+ "WHERE u.id = ?9"
)
public class User implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
@NotNull
private String userId;
@NotNull
private String password;
@NotNull
private String userRole;
@NotNull
private String firstName;
@NotNull
private String lastName;
@Temporal(TemporalType.DATE)
private Date dateOfBirth;
@NotNull
private String officePhone;
private String cellPhone;
@NotNull
private String company;
............
}
这是class与数据库交互
Stateless
public class LoginRequestSessionBean {
public void addUser(User u) throws ListServiceException {
try {
em.persist(u);
} catch (Exception e) {
throw (ExceptionHandler.wrapException(
e, logger,
"Error occured when adding a user "+u.getUserId()));
}
}
public void removeUser(User u) throws ListServiceException{
try{
if(!em.contains(u)){
u = em.merge(u);
}
em.remove(u);
} catch (Exception e) {
throw (ExceptionHandler.wrapException(e, logger,"Error occured while removing a user");
}
}
public void updateUser(User u) throws ListServiceException{
try {
updatedRow = em.createNamedQuery("updateUser")
.setParameter(1, u.getUserId())
.setParameter(2, u.getUserRole())
.setParameter(3, u.getCellPhone())
.setParameter(4, u.getCompany())
.setParameter(5, u.getDateOfBirth())
.setParameter(6, u.getFirstName())
.setParameter(7, u.getLastName())
.setParameter(8, u.getOfficePhone())
.setParameter(9, u.getId())
.executeUpdate();
} catch (Exception e) {
throw ExceptionHandler.wrapException(e, logger, "Error occured while updating user");
}
}
public User getUser(Long id) throws ListServiceException{
User user;
try {
user = em.find(User.class, id);
} catch (Exception e) {
throw ExceptionHandler.wrapException(e,logger,"Error occured in"+className+".getuser()");
}
return user;
}
}
这是处理日期列的更新 JSF 页面的相关部分
<h:column>
<f:facet name="header">#{bundle.loginmanagementdob}</f:facet>
<h:inputText
p:type="date"
value = "#{l.dateOfBirth}"
size ="15" rendered = "#{l.canUpdate}" >
<f:convertDateTime type="date"
pattern = "yyyy-mm-dd" />
</h:inputText>
<h:outputText value = "#{l.dateOfBirth}"
rendered = "#{not l.canUpdate}" >
<f:convertDateTime
type="date"
pattern = "yyyy-mm-dd" />
</h:outputText>
</h:column>
<h:column>
<f:facet name = "header">Update</f:facet>
<h:commandLink value = "Update"
disabled="#{login.currentUser.userRole == 'delete' or login.currentUser.userRole == 'consumer'}"
action = "#{loginManagment.updateLinkAction(l)}"
rendered = "#{not l.canUpdate}">
</h:commandLink>
</h:column>
<f:facet name="footer">
<h:panelGroup style="display: block; border-color: aquamarine;text-align: center;">
<h:commandButton id="update"
tabindex="1"
value="Save updates"
action="#{loginManagment.saveUpdate}" />
</h:panelGroup>
</f:facet>
这是 JSF 页面的托管 bean：
@Named
@SessionScoped
public class LoginManagment implements Serializable {
private static final long serialVersionUID = 1009L;
private LoginRequestSessionBean request;
private final ResourceBundle bundle; //application resource bundle
public LoginManagment() {
//Get the application's resource bundle
bundle = ResourceBundle.getBundle("webmessages");
}
public List<User> getUsers() {
if ((users == null) || refresh) {
try {
users = request.getUsers();
} catch (EJBException e) {
FacesMessage errMsg = new FacesMessage(e.getMessage());
FacesContext.getCurrentInstance().addMessage(null, errMsg);
}
refresh = false;
}
return users;
}
public void resetUpdateLink() {
users
.stream()
.filter(e -> e.getCanUpdate() == true)
.forEach(e -> e.setCanUpdate(false));
}
public String updateLinkAction(User u) {
u.setCanUpdate(true);
return null;
}
public String saveUpdate() {
Function<User, User> update = n -> {
request.updateUser(n);
return n;
};
try {
users
.stream()
.filter(e -> e.getCanUpdate() == true)
.forEach(update);
resetUpdateLink();
FacesMessage msg = new FacesMessage(bundle.getString("loginmanagementupdatesuccess"));
FacesContext.getCurrentInstance().addMessage(null, msg);
} catch (ListServiceException e) {
FacesMessage errMsg = new FacesMessage(e.getMessage());
FacesContext.getCurrentInstance().addMessage(null, errMsg);
}
logger.exiting(className, "saveUpdate()");
return null;
}
}
这是处理日期字段的添加用户 JSF 页面的相关部分：
<h:outputLabel id="adddoblabel"
for="adduserdob"
style="color: green; font: caption; font-size: large;
font-family: cursive; border-color: aquamarine"
value="#{bundle.adduserdob}" />
<h:inputText id="adduserdob"
p:type="date"
label="Date Of Birth "
title="Date Of Birth"
style="border-color: aquamarine"
value="#{addUser.dateOfBirth}"
required="true"
requiredMessage="#{bundle.adduserdoberror}"
maxlength="30" >
<f:convertDateTime type="date"
pattern = "yyyy-mm-dd" />
</h:inputText>
<f:facet name="footer">
<h:panelGroup style="display: block; border-color: aquamarine;text-align: center;">
<h:commandButton id="addusercommandbutton"
value="Add"
immediate="false"
style="font-size: large; font-family: cursive"
action="#{addUser.addAction}">
</h:commandButton>
</h:panelGroup>
</f:facet>
</h:panelGrid>
这是 JSF 添加用户页面的托管 bean：
@Named
@SessionScoped
public class AddUser implements Serializable {
private static final long serialVersionUID = 1100L;
private String firstName;
private String lastName;
private Date dateOfBirth;
@EJB
private LoginRequestSessionBean request;
private ResourceBundle bundle; //application resource bundle
public AddUser() {
bundle = ResourceBundle.getBundle("webmessages");
}
public Date getDateOfBirth() {
return dateOfBirth;
}
public void setDateOfBirth(Date date){
dateOfBirth=date;
}
private void clearDataField() {
this.password = null;
this.userId = null;
this.role = null;
this.cellPhone = null;
this.officePhone = null;
this.company = null;
this.dateOfBirth = null;
this.firstName = null;
this.lastName = null;
}
public void addAction() {
try {
User u = new User(getUserId(), getPassword(), getRole(), getFirstName(), getLastName()
,getDateOfBirth(), getOfficePhone(),getCellPhone(),getCompany());
request.addUser(u);
clearDataField();
FacesMessage successMsg = new FacesMessage(bundle.getString("addusersuccess"));
FacesContext.getCurrentInstance().addMessage(null, successMsg);
} catch (EJBException e) {
FacesMessage successMsg = new FacesMessage(e.getMessage());
FacesContext.getCurrentInstance().addMessage(null, successMsg);
}
}
}
这是因为您已将日期转换器配置为将连字符之间的部分解释为分钟。
<f:convertDateTime type="date" pattern="yyyy-mm-dd" />
根据 its documentation the pattern symbols are specified in the documentation of java.text.SimpleDateFormat. This documentation says，您应该使用 M 几个月。
Letter Date or time component Presentation Examples M Month in year (context sensitive) Month July; Jul; 07 m Minute in hour Number 30
因此，相应地调整模式：
<f:convertDateTime type="date" pattern="yyyy-MM-dd" />
与具体问题无关：指定pattern 属性时忽略type 属性。下面的声明同样可以。
<f:convertDateTime pattern="yyyy-MM-dd" />
这在its documentation中也有规定。
If a
patternhas been specified, its syntax must conform the rules specified byjava.text.SimpleDateFormat. Such a pattern will be used to parse, and thetype,dateStyle, andtimeStyleproperties will be ignored.