Question

我正在尝试将我的（xadmin.xhtml）中的值传递给我的（JadminBeans.java）四天，但到目前为止还没有运气。我想要做的是当我使用datatable推送行内的删除按钮时，该行内的所有数据应该从我的datatable和mysql数据库中删除。所以这是我的代码的一部分： P.s：我是java EE和jsf的新手

xadmin.xhtml

<h:dataTable value="#{Jadmin.messages}" var="o"
            styleClass="order-table"
            headerClass="order-table-header"
            rowClasses="order-table-odd-row,order-table-even-row"
        >

        <h:column>

            <f:facet name="header">username</f:facet>
            #{o.username}

        </h:column>

        <h:column>

            <f:facet name="header">password</f:facet>
            #{o.password}

        </h:column>

        <h:column>

            <f:facet name="header">permission</f:facet>
            #{o.permission}

        </h:column>


        <h:column>

            <f:facet name="header">delete</f:facet>

            <h:commandLink value="Delete" action="#{Jadmin.delete(o.username)}" />

        </h:column>

        </h:dataTable>

JadminBeans.java

@ManagedBean(name = "Jadmin")
@SessionScoped
public class JadminBeans {

    private String username, password, permission;
    private JadminController JaC;

    // insert getter setter here
    public List<JadminBeans> getMessages() {
        return JadminDAO.getAllUsers();
    }
    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 void  delete(String usr) {

     System.out.println("JadminBeans >> delete() ---------- username= "+usr);
      JadminDAO.deleteUser(usr);

    }

}

JadminDAO.java

 public static List<JadminBeans> getAllUsers() {
        List<JadminBeans> users = new ArrayList<JadminBeans>();
        try {
            Connection con = DBconnection.getConnection();
            Statement statement = connection.createStatement();
            ResultSet rs = statement.executeQuery("select * from users");
            while (rs.next()) {
                JadminBeans user = new JadminBeans();
                 user.setUsername(rs.getString("username"));
                 user.setPassword(rs.getString("password"));
                 user.setPermission(rs.getString("permission"));

                 System.out.println("JadminDAO > getAllUsers(): "+rs.getString("username"));

                users.add(user);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }

        return users;
    }
public static void deleteUser(String id) {
        try {
            PreparedStatement preparedStatement = connection.prepareStatement("delete from users where username=?");
            // Parameters start with 1
            preparedStatement.setString(1, id);
            preparedStatement.executeUpdate();
            System.out.println("JadminDAO >> deleteUser ----------"+ id);

        } catch (SQLException e) {
            System.out.println("JadminDAO >> deleteUser----------- SQLException :(");
            e.printStackTrace();
        }
    }

Answer 1

的UserBean：

public void deleteUser(String  user){
   UserDAO.DeleteUser(user);
}

xhtml文件：

<p:commandButton id="confirm" value="Yes Sure"
                oncomplete="confirmation.hide()"
                actionListener="#{userBean.deleteUser(userBean.selectedUser.user)}"
                update=":form1:overviewTableUser">
</p:commandButton>

UserDAO：

public static void DeleteUser(String user) {
    Connection con = null;
    PreparedStatement ps = null;

    try {
        con = Database.getConnection();
         String sql="delete  from userinfo where user=?";
       ps= con.prepareStatement(sql); 
        // Parameters start with 1
        ps.setString(1,"user");

        ps.executeUpdate();

        System.out.println("user deleted successfully");


    } catch (SQLException e) {
        System.out.println(" SQLException :(");
        e.printStackTrace();
    }
}

这是解决这个问题的方法;）

使用jsf和mysql删除特定行TO DATATABLE

1 个答案: