Add "records" to the XML document"

The example in this article is similar to saving HTML format data to XML. In the past, when a table is submitted, we usually create a new document. now, as long as the document already exists, simply add it. The use of this technology is similar to the creation of basic data. The example in this article is similar to saving HTML format data to XML. In the past, when a table is submitted, we usually create a new document. now, as long as the document already exists, simply add it. The use of this technology is similar to the creation of basic data.

In the previous article, I have demonstrated how to use XMLDOM. Therefore, we can directly enter the example in this article.

The first thing we need to consider is to add an HTML form for the new "record. In the "save HTML form data to XML" example, we have used this form, but changed the file name, but the code is the same.

AddContact.html:

 　　 　　　 Contact Information  　　 　　 　　　 　　 　　

We set this HTML form to process ADD. ASP. The ASP page is used to check whether the XML. file and ROLODEX. XML exist. If they do exist, ASP will append a new entry to the file. if the file does not exist, you need to create it.

Process Add. asp:

<% 　　　'-------------------------------------------------------------------- 　　　'The "addNewContacttoXML" Function accepts two parameters. 　　　'strXMLFilePath - The physical path where the XML file will be saved. 　　　'strFileName - The name of the XML file that will be saved. 　　　'-------------------------------------------------------------------- 　　　Function addNewContacttoXML(strXMLFilePath, strFileName)  　　　　'Declare local variables.  　　　　Dim objDom  　　　　Dim objRoot  　　　　Dim objRecord  　　　　Dim objField 　　　　Dim objFieldValue  　　　　Dim objattID  　　　　Dim objattTabOrder  　　　　Dim objPI  　　　　Dim blnFileExists  　　　　Dim x  　　　　'Instantiate the Microsoft XMLDOM.  　　　　Set objDom = server.CreateObject("Microsoft.XMLDOM")  　　　　objDom.preserveWhiteSpace = True 　　　　'Call the Load Method of the XMLDOM Object. The Load ethod has a  　　　　'boolean return value indicating whether or not the file could be  　　　　'loaded. If the file exists and loads it will return true, otherwise, 　　　　'it will return false. 　　　　blnFileExists = objDom.Load(strXMLFilePath & "\" & strFileName)  　　　　'Test to see if the file loaded successfully.  　　　　If blnFileExists = True Then  　　　　　'If the file loaded set the objRoot Object equal to the root element  　　　　　'of the XML document.  　　　　　Set objRoot = objDom.documentElement Else  　　　　　'Create your root element and append it to the XML document.  　　　　　Set objRoot = objDom.createElement("rolodex")  　　　　　objDom.appendChild objRoot 　　　　End If  　　　　　'Create the new container element for the new record.  　　　　　Set objRecord = objDom.createElement("contact")  　　　　　objRoot.appendChild objRecord  　　　　　'Iterate through the Form Collection of the Request Object. 　　　　　For x = 1 To Request.Form.Count  　　　　　　'Check to see if "btn" is in the name of the form element. If it is,  　　　　　　'then it is a button and we do not want to add it to the XML  　　　　　　'document".  　　　　　　If instr(1,Request.Form.Key(x),"btn") = 0 Then  　　　　　　　'Create an element, "field".  　　　　　　　Set objField = objDom.createElement("field")  　　　　　　　'Create an attribute, "id".  　　　　　　　Set objattID = objDom.createAttribute("id")  　　　　　　　'Set the value of the id attribute equal the the name of the current  　　　　　　　'form field.  　　　　　　　objattID.Text = Request.Form.Key(x)  　　　　　　　'The setAttributeNode method will append the id attribute to the  　　　　　　　'field element. objField.setAttributeNode objattID  　　　　　　　'Create another attribute, "taborder". This just orders the  　　　　　　　'elements.  　　　　　　　Set objattTabOrder = objDom.createAttribute("taborder")  　　　　　　　 　　　　　　　'Set the value of the taborder attribute.  　　　　　　　objattTabOrder.Text = x  　　　　　　　'Append the taborder attribute to the field element.  　　　　　　　'objField.setAttributeNode objattTabOrder  　　　　　　　'Create a new element, "field_value". 　　　　　　　Set objFieldValue = objDom.createElement("field_value")  　　　　　　　'Set the value of the field_value element equal to the value of the  　　　　　　　'current field in the Form Collection.  　　　　　　　objFieldValue.Text = Request.Form(x)  　　　　　　　'Append the field element as a child of the new record container  　　　　　　　'element, contact. objRecord.appendChild objField  　　　　　　　'Append the field_value element as a child of the field element. 　　　　　　　objField.appendChild objFieldValue  　　　　　　End If  　　　　　Next  　　　　　'Check once again to see if the file loaded successfully. If it did  　　　　　'not, that means we are creating a new document and need to be sure to  　　　　　'insert the XML processing instruction.  　　　　　If blnFileExists = False then  　　　　　　'Create the xml processing instruction.  　　　　　　Set objPI = objDom.createProcessingInstruction("xml", "version='1.0'")  　　　　　　'Append the processing instruction to the XML document.  　　　　　　objDom.insertBefore objPI, objDom.childNodes(0)  　　　　　End If  　　　　　'Save the XML document. 　　　　　objDom.save strXMLFilePath & "\" & strFileName  　　　　　'Release all of your object references.  　　　　　Set objDom = Nothing  　　　　　Set objRoot = Nothing  　　　　　Set objRecord = Nothing  　　　　　Set objField = Nothing  　　　　　Set objFieldValue = Nothing  　　　　　Set objattID = Nothing  　　　　　Set objattTabOrder = Nothing  　　　　　Set objPI = NothingEnd  　　　　Function 　　　　'Do not break on an error. 　　　　On Error Resume Next 　　　　'Call the addNewContacttoXML function, passing in the physical path to 　　　　'save the file to and the name that you wish to use for the file. 　　　　addNewContacttoXML "c:","rolodex.xml" 　　　　'Test to see if an error occurred, if so, let the user know. 　　　　'Otherwise, tell the user that the operation was successful. 　　　　If err.number <> 0 then  　　　　　Response.write("Errors occurred while saving your form submission.") 　　　　Else  　　　　　Response.write("Your form submission has been saved.") 　　　　End If 　　　%>

If you have read an article about "saving HTML form data to XML format, you will notice that the code appended to the HTML data extended to the XML file is basically the same as the code extended to the new document. However, there are two main differences:

　'Call the Load Method of the XMLDOM Object. The Load Method has a  　　　'boolean return value indicating whether or not the file could be  　　　'loaded. If the file exists and loads it will return true, otherwise,  　　　'it will return false.  　　　blnFileExists = objDom.Load(strXMLFilePath & "\" & strFileName)  　　　 　　　'Test to see if the file loaded successfully.  　　　If blnFileExists = True Then  　　　　'If the file loaded set the objRoot Object equal to the root element  　　　　'of the XML document.  　　　　Set objRoot = objDom.documentElement 　　　Else  　　　　'Create your root element and append it to the XML document.  　　　　Set objRoot = objDom.createElement("contact")  　　　　objDom.appendChild objRoot  　　　End If

The code in this section comes from the addNewContacttoXML function. Because it is impossible for us to create a new file every time, we save the CONTACT. If you can LOAD this file, we get the root element of this XML file. if not, assume that it does not exist and creates a new element and attaches it to the XML document.

Another major difference is: when we perform a secondary check on the file and check whether the LOAD is successful, we can decide whether to add a processing command. If the file exists, we do not need to add this command. However, if a new file is created, you must add this processing instruction.

'Check once again to see if the file loaded successfully. If it did  　　'not, that means we are creating a new document and need to be sure to  　　'insert the XML processing instruction.  　　If blnFileExists = False then  　　　'Create the xml processing instruction.  　　　Set objPI = objDom.createProcessingInstruction("xml", "version='1.0'")  　　　'Append the processing instruction to the XML document.  　　　objDom.insertBefore objPI, objDom.childNodes(0)  　　End If

Apart from the two differences above, you can find that the code for saving data to a new file is actually the same as the code for appending a new record to an existing file. We create a new element and contact INER to accommodate each newly added RECORD. The code will repeatedly create appropriate XML nodes in Form Collection of the Request Objec and set these node values to the same as the current Form Field.

The above is the content of adding a new "records" to the XML document. For more information, see PHP Chinese website (www.php1.cn )!