小编给大家分享一下如何运用DOM解析VB.NET XML文件,相信大部分人都还不怎么了解,因此分享这篇文章给大家参考一下,希望大家阅读完这篇文章后大有收获,下面让我们一起去了解一下吧!
XML文件是安全的,在程序中我们大多数的文件都是XML文件,但是对于用DOM解析XML文件熟练运用的还是很少,如何使用DOM解析VB.NET XML文件呢?
建立字符串写文件,XML是由<></>组成,实际上把所有字符形成后再写进文件中即可。但此类方法不适合大数据的操作。
2、XLST,相当与CSS,VB不适合。
3、DOM。
所以介绍的是使用DOM来写VB.NET XML文件。以下范例以SQLSERVER的Northwind中Employee表进行示范。VB.NET XML文件代码如下:
Option Explicit Public RsAs New ADODB.Recordset Public Conn As New ADODB.Connection Public tempDocAs MSXML2.DOMDocument 'xml文件 Public tempNode As MSXML2.IXMLDOMNode Public Root As MSXML2.IXMLDOMElement Public tempelement As MSXML2.IXMLDOMElement Public tempattribute As MSXML2.IXMLDOMElement Public emp As MSXML2.IXMLDOMElement Private Sub Command1_Click() '生成一个XML DOMDocument对象 Set tempDoc = New MSXML2.DOMDocument '生成根节点并把它设置为文件的根 Set Root = tempDoc.createElement("employees") Set tempDoc.documentElement = Root '在节点上添加多个属性 Call Root.setAttribute("xmlns:xsd", "http://www.w3.org/2001/XMLSchema") Call Root.setAttribute("xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance") Call Root.setAttribute("xmlns", "http://www.kingdee.com/ReK3Inventory") Do While Not Rs.EOF Set emp = tempDoc.createNode(MSXML2.NODE_ELEMENT, "employee", "") Root.appendChild emp '生成孩子节点添加到根节点上去,并且为这个节点设置一个属性 Set tempNode = tempDoc.createNode(MSXML2.NODE_ELEMENT, "Employeeid", "") tempNode.Text = Rs(0) emp.appendChild tempNode Set tempNode = tempDoc.createNode(MSXML2.NODE_ELEMENT, "Firstname", "") tempNode.Text = Rs(1) emp.appendChild tempNode Set tempNode = tempDoc.createNode(MSXML2.NODE_ELEMENT, "Title", "") tempNode.Text = Rs(2) emp.appendChild tempNode Rs.MoveNext Loop Dim pi As IXMLDOMProcessingInstruction Set pi = tempDoc.createProcessingInstruction("xml", "version='1.0' encoding='gb2312'") Call tempDoc.insertBefore(pi, tempDoc.childNodes(0)) '直接保存成文件即可 tempDoc.Save "c:\myTest.xml" Unload Me End Sub Private Sub Form_Load() '连接SQLSERVER Dim strConn As String strConn = "Provider=SQLOLEDB.1;Persist Security Info=False;User ID=sa;Initial Catalog=Northwind;Data Source=LocalHost" Conn.CursorLocation = adUseClient Conn.Open strConn If Rs.State <> adStateClosed Then Rs.Close Rs.Open "Select employeeid,Firstname,Title from employees ", Conn, adOpenStatic, adLockOptimistic End Sub Private Sub Form_Unload(Cancel As Integer)Rs.Close Set Rs = Nothing Conn.Close Set Conn = Nothing End Sub
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