可编辑的p：dataTable没有在bean中设置更新的值

Question

我试图编辑用户数据，但我无法将更新后的值设置为管理bean。

我尝试在我的SQL更新中手动编写值并且它可以正常工作，但我现在没有选择，任何帮助将不胜感激：

XHTML：

<p:dataTable id="DT" value="#{Jadmin.messages}" var="o"
             selection="#{Jadmin.selectedUser}" rowKey="#{o.id}"
             style="margin-bottom:20px" editable="true">

    <f:facet name="header">
        Users List
    </f:facet>

    <p:column selectionMode="single" />

    <p:column>
        <f:facet name="header">
            <h:outputText value="id" />
        </f:facet>

        <h:outputText value="#{o.id}" />
    </p:column>

    <p:column>
        <f:facet name="header">
            <h:outputText value="username" />
        </f:facet>

        <p:inputText value="#{o.username}"  />
    </p:column>

    <p:column>
        <f:facet name="header">
            <h:outputText value="password" />
        </f:facet>

        <h:outputText value="#{o.password}" />
    </p:column>

    <p:column>
        <f:facet name="header">
            <h:outputText value="permission" />
        </f:facet>

        <h:outputText value="#{o.permission}" />
    </p:column>

    <f:facet name="footer">
        <p:commandButton  value="Update" action="#{Jadmin.update}" />

        <p:commandButton value="Delete"
                         action="#{Jadmin.delete}"
                         ajax="false"
                         update=":form:msgs"/>
    </f:facet>
</p:dataTable>

更新我认为导致问题的数据库的方法 爪哇：

public static void updateUser(JadminController user) {
    try {
        PreparedStatement preparedStatement = connection.prepareStatement("UPDATE users SET username = ?,password =?, permission =? WHERE username = ? ");

        preparedStatement.setString(1, user.getUsername()); //updated value should be here
        preparedStatement.setString(2, user.getPassword());//updated value should be here
        preparedStatement.setString(3, user.getPermission());//updated value should be here
        preparedStatement.setString(4, user.getUsername());//searching by user for now I will change it to id later
        preparedStatement.executeUpdate();

    } catch (SQLException e) {
        e.printStackTrace();
    }
}

JadminController.java

package admin_page;

import java.io.Serializable;

public class JadminController implements Serializable {

    private static final long serialVersionUID = 1L;
    private String username, password, permission;
    private long id;
    boolean editable;

    public JadminController() {}

    public JadminController(String username, String password, String permission) {
        this.username = username;
        this.password = password;
        this.permission = permission;
    }

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getPermission() {
        return permission;
    }

    public void setPermission(String permission) {
        this.permission = permission;
    }
}

Managed Bean：

public class JadminBeans implements Serializable{


private static final long serialVersionUID = 1L;

private String username, password, permission;

private JadminController selectedUser;


List<JadminController> userslist = new ArrayList<JadminController>();


public List<JadminController> getMessages() {
    System.out.println("List<JadminController> getMessages()");
    userslist=  JadminDAO.getAllUsers();
    return userslist;
}

public String getUsername() {
    return username;
}

public void setUsername(String username) {
    this.username = username;
}

public String getPassword() {
    return password;
}

public void setPassword(String password) {
    this.password = password;
}

public String getPermission() {
    return permission;
}

public void setPermission(String permission) {
    this.permission = permission;
}


public JadminController getSelectedUser() {
    return selectedUser;
}

public void setSelectedUser(JadminController selectedUser) {
    this.selectedUser = selectedUser;
}


public void add(){

    JadminController ADDUSER = new JadminController (this.username, this.password ,this.permission);
    userslist.add(ADDUSER);
    JadminDAO.addUser(ADDUSER);
}



public void update(){


    JadminDAO.updateUser(selectedUser);
}


 }