Xbase++

Find and Update an XML Attribute Value

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Demonstrates how to find an element in XML with a specified attribute name and then update the attribute value. Xbase++

LOCAL oXml1
LOCAL oXml2
LOCAL cPhrase_id
LOCAL cPhrase_value
LOCAL oSbPath
LOCAL i
LOCAL nCount_i

//  Let's say you have 2 XML files with identical structures as shown directly below,
//  and you wish to update the values in the 1st XML file with those in the 2nd XML file.

//  <global>
//      <phrase id="2FADisabled" value="2factor authentication disabled"/>
//      <phrase id="2FAEnabled" value="2factor authentication enabled"/>
//      <phrase id="2FAResetFailed" value="Failed to disable two factor authentication"/>
//  </global>

//  <global>
//      <phrase id="2FAResetFailed" value="Failed to reset two factor authentication"/>
//      <phrase id="2FADisabled" value="2FA authentication disabled"/>
//      <phrase id="2FAEnabled" value="2FA authentication enabled"/>
//  </global>

//  First, initialize each of the Chilkat XML objects.
//  These could be loaded from files, but we'll just create them manually for this example..

oXml1 := CreateObject("Chilkat.Xml")
oXml1:Tag := "global"
oXml1:UpdateAttrAt("phrase", 1, "id", "2FADisabled")
oXml1:UpdateAttrAt("phrase", 1, "value", "2factor authentication disabled")
oXml1:UpdateAttrAt("phrase[1]", 1, "id", "2FAEnabled")
oXml1:UpdateAttrAt("phrase[1]", 1, "value", "2factor authentication enabled")
oXml1:UpdateAttrAt("phrase[2]", 1, "id", "2FAResetFailed")
oXml1:UpdateAttrAt("phrase[2]", 1, "value", "Failed to disable two factor authentication")

oXml2 := CreateObject("Chilkat.Xml")
oXml2:Tag := "global"
oXml2:UpdateAttrAt("phrase", 1, "id", "2FAResetFailed")
oXml2:UpdateAttrAt("phrase", 1, "value", "Failed to reset two factor authentication")
oXml2:UpdateAttrAt("phrase[1]", 1, "id", "2FADisabled")
oXml2:UpdateAttrAt("phrase[1]", 1, "value", "2FA authentication disabled")
oXml2:UpdateAttrAt("phrase[2]", 1, "id", "2FAEnabled")
oXml2:UpdateAttrAt("phrase[2]", 1, "value", "2FA authentication enabled")

//  Iterate over attribute values in xml2 and update the same in xml1.

oSbPath := CreateObject("Chilkat.StringBuilder")

i := 0
nCount_i := oXml2:NumChildrenHavingTag("phrase")
DO WHILE i < nCount_i
    oXml2:I := i
    cPhrase_id := oXml2:ChilkatPath("phrase[i]|(id)")
    cPhrase_value := oXml2:ChilkatPath("phrase[i]|(value)")

    //  Notice how the UpdateAttrAt method's 1st argument is a Chilkat path -- which is an expression
    //  to find the location of the XML element to be updated.
    //  Here we create a path of the form "/A/tagName,attributeName,attributeValuePattern", which means
    //  find the direct descendent of xml2 having tag=tagName, with an attribute=attributeName where the attribute value
    //  matches the attributeValuePattern.  If attributeValuePattern does not contain a "*", then it must match directly.
    //  We'll build a Chilkat path such as "/A/phrase,id,2FADisabled"
    oSbPath:SetString("/A/phrase,id,")
    oSbPath:Append(cPhrase_id)

    //  This assumes the corresponding element exists in xml1.
    oXml1:UpdateAttrAt(oSbPath:GetAsString(), 1, "value", cPhrase_value)

    i := i + 1
ENDDO

//  Now see how xml1 has been updated..
? oXml1:GetXml()

//  <global>
//      <phrase id="2FADisabled" value="2FA authentication disabled"/>
//      <phrase id="2FAEnabled" value="2FA authentication enabled"/>
//      <phrase id="2FAResetFailed" value="Failed to reset two factor authentication"/>
//  </global>

oXml1:destroy()
oXml2:destroy()
oSbPath:destroy()