Home  >  Article  >  Backend Development  >  XML add, delete, modify and query examples

XML add, delete, modify and query examples

黄舟
黄舟Original
2017-02-27 16:47:301796browse

1.已知有一个XML文件(bookstore.xml)如下:

<?xml version="1.0" encoding="gb2312"?>
<bookstore>
  <book genre="fantasy" ISBN="2-3631-4">
    <title>Oberon&#39;s Legacy</title>
    <author>Corets, Eva</author>
    <price>5.95</price>
  </book>
</bookstore>

  1、往70520fc1addb88c1722487f5b44e82c9节点中插入一个463aef0d2da08708f472268a99530dbe节点:

   XmlDocument xmlDoc=new XmlDocument();
   xmlDoc.Load("bookstore.xml");
   XmlNode root=xmlDoc.SelectSingleNode("bookstore");//查找<bookstore>
   XmlElement xe1=xmlDoc.CreateElement("book");//创建一个<book>节点
   xe1.SetAttribute("genre","李赞红");//设置该节点genre属性
   xe1.SetAttribute("ISBN","2-3631-4");//设置该节点ISBN属性

   XmlElement xesub1=xmlDoc.CreateElement("title");
   xesub1.InnerText="CS从入门到精通";//设置文本节点
   xe1.AppendChild(xesub1);//添加到<book>节点中
   XmlElement xesub2=xmlDoc.CreateElement("author");
   xesub2.InnerText="候捷";
   xe1.AppendChild(xesub2);
   XmlElement xesub3=xmlDoc.CreateElement("price");
   xesub3.InnerText="58.3";
   xe1.AppendChild(xesub3);

   root.AppendChild(xe1);//添加到<bookstore>节点中
   xmlDoc.Save("bookstore.xml");

  //================
  结果为:

<?xml version="1.0" encoding="gb2312"?>
<bookstore>
  <book genre="fantasy" ISBN="2-3631-4">
    <title>Oberon&#39;s Legacy</title>
    <author>Corets, Eva</author>
    <price>5.95</price>
  </book>
  <book genre="李赞红" ISBN="2-3631-4">
    <title>CS从入门到精通</title>
    <author>候捷</author>
    <price>58.3</price>
  </book>
</bookstore>

2、修改节点:将genre属性值为“李赞红“的节点的genre值改为“update李赞红”,将该节点的子节点48fe722b397613e801e59f453d6c9330的文本修改为“亚胜”。

  XmlNodeList nodeList=xmlDoc.SelectSingleNode("bookstore").ChildNodes;//获取bookstore节点的所有子节点
   foreach(XmlNode xn in nodeList)//遍历所有子节点
   {
    XmlElement xe=(XmlElement)xn;//将子节点类型转换为XmlElement类型
    if(xe.GetAttribute("genre")=="李赞红")//如果genre属性值为“李赞红”
    {
     xe.SetAttribute("genre","update李赞红");//则修改该属性为“update李赞红”

     XmlNodeList nls=xe.ChildNodes;//继续获取xe子节点的所有子节点
     foreach(XmlNode xn1 in nls)//遍历
     {
      XmlElement xe2=(XmlElement)xn1;//转换类型
      if(xe2.Name=="author")//如果找到
      {
       xe2.InnerText="亚胜";//则修改
       break;//找到退出来就可以了
      }
     }
     break;
    }
   }

   xmlDoc.Save("bookstore.xml");//保存。

  //=================

  最后结果为:

<?xml version="1.0" encoding="gb2312"?>
<bookstore>
  <book genre="fantasy" ISBN="2-3631-4">
    <title>Oberon&#39;s Legacy</title>
    <author>Corets, Eva</author>
    <price>5.95</price>
  </book>
  <book genre="update李赞红" ISBN="2-3631-4">
    <title>CS从入门到精通</title>
    <author>亚胜</author>
    <price>58.3</price>
  </book>
</bookstore>

  3、删除 a43d2e45188b5491332a0b39981a5448节点的genre属性,删除 d4a88622e96e62b9214db14f87fab57b节点。

XmlNodeList xnl=xmlDoc.SelectSingleNode("bookstore").ChildNodes;

   foreach(XmlNode xn in xnl)
   {
    XmlElement xe=(XmlElement)xn;
    if(xe.GetAttribute("genre")=="fantasy")
    {
     xe.RemoveAttribute("genre");//删除genre属性
    }
    else if(xe.GetAttribute("genre")=="update李赞红")
    {
     xe.RemoveAll();//删除该节点的全部内容
    }
   }
   xmlDoc.Save("bookstore.xml");

  //====================

  最后结果为:

<?xml version="1.0" encoding="gb2312"?>
<bookstore>
  <book ISBN="2-3631-4">
    <title>Oberon&#39;s Legacy</title>
    <author>Corets, Eva</author>
    <price>5.95</price>
  </book>
  <book>
  </book>
</bookstore>

 4、显示所有数据。

 XmlNode xn=xmlDoc.SelectSingleNode("bookstore");

   XmlNodeList xnl=xn.ChildNodes;

   foreach(XmlNode xnf in xnl)
   {
    XmlElement xe=(XmlElement)xnf;
    Console.WriteLine(xe.GetAttribute("genre"));//显示属性值
    Console.WriteLine(xe.GetAttribute("ISBN"));

    XmlNodeList xnf1=xe.ChildNodes;
    foreach(XmlNode xn2 in xnf1)
    {
     Console.WriteLine(xn2.InnerText);//显示子节点点文本
    }
   }

2前台代码:html

<%@ Page language="c#" Codebehind="Main.aspx.cs" AutoEventWireup="false" Inherits="DsAndXML.OpXMLFile.Main" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
    <HEAD>
        <title>Main</title>
        <meta name="GENERATOR" Content="Microsoft Visual Studio 7.0">
        <meta name="CODE_LANGUAGE" Content="C#">
        <meta name="vs_defaultClientScript" content="JavaScript">
        <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
    </HEAD>
    <body MS_POSITIONING="GridLayout">
        <form id="Main" method="post" runat="server">
            <FONT face="宋体">
    <asp:DataGrid id="dgShow" style="Z-INDEX: 100; LEFT: 113px; POSITION: absolute; TOP: 32px" runat="server" Width="480px" Height="178px"></asp:DataGrid>
    <asp:Label id="Label3" style="Z-INDEX: 111; LEFT: 187px; POSITION: absolute; TOP: 383px" runat="server" Width="120px" Height="21px">新邮件地址:</asp:Label>
      <asp:Label id="Label2" style="Z-INDEX: 107; LEFT: 333px; POSITION: absolute; TOP: 274px" runat="server" Width="83px" Height="21px">邮件地址:</asp:Label>
          <asp:Button id="btnAdd" style="Z-INDEX: 104; LEFT: 298px; POSITION: absolute; TOP: 324px" runat="server" Text="添加"></asp:Button>
                <asp:Button id="btnDelete" style="Z-INDEX: 103; LEFT: 199px; POSITION: absolute; TOP: 324px" runat="server" Text="删除"></asp:Button>
                <asp:Button id="btnChange" style="Z-INDEX: 102; LEFT: 102px; POSITION: absolute; TOP: 382px" runat="server" Text="修改"></asp:Button>
                <asp:Button id="btnQuery" style="Z-INDEX: 101; LEFT: 101px; POSITION: absolute; TOP: 324px" runat="server" Text="查询"></asp:Button>
 <asp:DropDownList id="ddlName" style="Z-INDEX: 105; LEFT: 210px; POSITION: absolute; TOP: 274px" runat="server" Width="95px" Height="78px"></asp:DropDownList>
 <asp:Label id="Label1" style="Z-INDEX: 106; LEFT: 100px; POSITION: absolute; TOP: 274px" runat="server" Width="83px" Height="21px">姓名:</asp:Label>
                <asp:Label id="lbEmail" style="Z-INDEX: 109; LEFT: 459px; POSITION: absolute; TOP: 274px" runat="server" Width="231px"></asp:Label>
 <asp:TextBox id="tbNewMail" style="Z-INDEX: 110; LEFT: 330px; POSITION: absolute; TOP: 381px" runat="server" Width="208px" Height="26px"></asp:TextBox></FONT>
        </form>
    </body>
</HTML>

XML文件dbGuest.xml

<?xml version="1.0" standalone="yes"?>
<dbGuest>
  <User>
    <Name>aaa</Name>
    <City>shanghai</City>
    <Email>aaa@263.net</Email>
    <Message>ok</Message>
    <STime>2004-07-12T00:00:00.0000000+08:00</STime>
  </User>
  <User>
    <Name>shaoazhd</Name>
    <City>beijing</City>
    <Email>sss@22.net</Email>
    <Message>afsa</Message>
    <STime>2004-7-12 15:07:39</STime>
  </User>
  <User>
    <Name>Guset</Name>
    <City>上海</City>
    <Email>sfaf@22.net</Email>
  </User>
  <User>
    <Name>Guset</Name>
    <City>上海</City>
    <Email>ss@22.net</Email>
  </User>
</dbGuest>
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Xml;
using System.Xml.XPath;
namespace DsAndXML.OpXMLFile
{
    /// <summary>
    /// Main 的摘要说明。
    /// </summary>
    public class Main : System.Web.UI.Page
    {
        protected System.Web.UI.WebControls.Button btnQuery;
        protected System.Web.UI.WebControls.Button btnChange;
        protected System.Web.UI.WebControls.Button btnDelete;
        protected System.Web.UI.WebControls.Button btnAdd;
        protected System.Web.UI.WebControls.DropDownList ddlName;
        protected System.Web.UI.WebControls.Label Label1;
        protected System.Web.UI.WebControls.Label Label2;
        protected System.Web.UI.WebControls.Label lbEmail;
        protected System.Web.UI.WebControls.TextBox tbNewMail;
        protected System.Web.UI.WebControls.Label Label3;
        protected System.Web.UI.WebControls.DataGrid dgShow;
    
        private void Page_Load(object sender, System.EventArgs e)
        {
            // 在此处放置用户代码以初始化页面
            if(!IsPostBack)
            Bind();

        }
        private void Bind()
        {
            DataSet ds = new DataSet();
            ds.ReadXml(Server.MapPath(".\\db\\dbGuest.xml"));
            dgShow.DataSource = ds.Tables[0].DefaultView;
            dgShow.DataBind();
            XmlDocument doc = new XmlDocument();
            doc.Load(Server.MapPath(".\\db\\dbGuest.xml"));
            XmlNodeList elemList = doc.GetElementsByTagName("Name");
            ddlName.Items.Clear();
            for(int i=0;i<elemList.Count;i++)
             ddlName.Items.Add(elemList[i].InnerXml);
            
        }

        Web Form Designer generated code

        private void btnQuery_Click(object sender, System.EventArgs e)
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(Server.MapPath(".\\db\\dbGuest.xml"));
            lbEmail.Text = doc.SelectSingleNode("//User[Name=&#39;"+ddlName.SelectedItem.Text+"&#39;]").ChildNodes.Item(2).InnerText;
         
        }

        private void btnChange_Click(object sender, System.EventArgs e)
        {
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load(Server.MapPath(".\\db\\dbGuest.xml"));
            XmlNodeList nodeList=xmlDoc.SelectSingleNode("dbGuest").ChildNodes;//获取dbGuest节点的所有子节点
            foreach(XmlNode xn in nodeList)//遍历所有子节点
            {
                XmlElement xe=(XmlElement)xn;//将子节点类型转换为XmlElement类型
            
                XmlNodeList node = xe.GetElementsByTagName("Name");
                if(node.Count>0)
                {

                    if(node[0].InnerText==ddlName.SelectedItem.Text)
                    {
                        XmlNodeList nls=xe.ChildNodes;//继续获取xe子节点的所有子节点
                        foreach(XmlNode xn1 in nls)//遍历
                        {
                            XmlElement xe2=(XmlElement)xn1;//转换类型
                            if(xe2.Name=="Email")//如果找到
                            {
                                xe2.InnerText=tbNewMail.Text;//则修改
                                break;//找到退出来就可以了
                            }
                        }
                        break;
                    }
                }
                
            }
            xmlDoc.Save(Server.MapPath(".\\db\\dbGuest.xml"));
            Bind();
        }

        private void btnDelete_Click(object sender, System.EventArgs e)
        {
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load(Server.MapPath(".\\db\\dbGuest.xml"));
            XmlNodeList xnl=xmlDoc.SelectSingleNode("dbGuest").ChildNodes;
 
            foreach(XmlNode xn in xnl)
            {
                XmlElement xe=(XmlElement)xn;
                XmlNodeList node = xe.GetElementsByTagName("Name");
                if(node.Count>0)
                {

                    if(node[0].InnerText==ddlName.SelectedItem.Text)
                        xe.RemoveAll();//删除该节点的全部内容
                    break;
                }
            }
            
            xmlDoc.Save(Server.MapPath(".\\db\\dbGuest.xml"));
            Bind();
        }

        private void btnAdd_Click(object sender, System.EventArgs e)
        {
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load(Server.MapPath(".\\db\\dbGuest.xml"));
            XmlNode root=xmlDoc.SelectSingleNode("dbGuest");//查找<dbGuest>
            XmlElement xe1=xmlDoc.CreateElement("User");//创建一个<User>节点
            XmlElement xesub1=xmlDoc.CreateElement("Name");
            xesub1.InnerText="Guset";//设置文本节点
            xe1.AppendChild(xesub1);//添加到<User>节点中
            XmlElement xesub2=xmlDoc.CreateElement("City");
            xesub2.InnerText="上海";
            xe1.AppendChild(xesub2);
            XmlElement xesub3=xmlDoc.CreateElement("Email");
            xesub3.InnerText="ss@22.net";
            xe1.AppendChild(xesub3);
 
            root.AppendChild(xe1);//添加到<dbGuest>节点中
            xmlDoc.Save(Server.MapPath(".\\db\\dbGuest.xml"));
            Bind();
        }
    }
}

 以上就是XML 增、删、改和查示例的内容,更多相关内容请关注PHP中文网(www.php.cn)!

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn