Use the attribute as a set of data and analysis of these data

Hello world
I present below a challenge (a little) with the use of attributes in XQuery. Consider the following XML document:

< showroom >
< car id = "1" >
< name > Clio < / name >
< family > Renault < / family >
< / car >
...
< id car = "n" >
< name > Q5 < / name >
Audi > family < < / family >
< / car >
< / showroom >

Each customer of the showroom is identified by a unique Id (for example, 1,2,3,...). Then, I want to add some data to my XML document that must represent, for each car, all of the IDs of all the customers who have rented this car.
The desired XML document might look like this:

< showroom >
< car id = "1" >
< name > Clio < / name >
< family > Renault < / family >
+ * < history > * +.
+ * < client id = "2" / > * +.
+ * < client id = "23" / > * +.
+ * < / history > * +.
< / car >
...
< id car = "n" >
< name > Q5 < / name >
Audi > family < < / family >
+ * < history > * +.
+ * < client id = "56" / > * +.
+ * < / history > * +.
< / car >
< / showroom >

However, using elements to represent the historic location, size of the document will increase considerably.
As I only use IDs of the IEN, y at - it a way to represent historical data using only the attributes? +.
In the following document, id of the IEN are represented, as a whole, through the +@history+attribute:
< showroom >
< car id = '1' history = '2.23' >
< name > Clio < / name >
< family > Renault < / family >
< / car >
...
< id car = history of "n" = "56" >
< name > Q5 < / name >
Audi > family < < / family >
< / car >
< / showroom >

However, y at - there no way to check if a given id = 'x' car was rented by a customer Id = 'y'? +.
Does anyone know how to represent historical data (sequence of identity of customers), using only the attributes and how to search for a given id of customer as explained above?
Please suggest. I appreciate your help.

OK, I thought that you already have a document that stores the relationship between customers and cars.

Here is an example that will insert or update the attribute of history:

let $carId := 3
let $clientId := 56
return
 copy $doc := fn:doc("c:\dev\xml\showroom.xml")
 modify (
  for $i in $doc/showroom/car
  where $i/@id = $carId
  return if (exists($i/@history))
          then replace value of node $i/@history with concat($i/@history,",",$clientId)
          else insert node attribute history {$clientId} into $i
 )
 return $doc

However, if we are reasoning in terms of standardization, it is better to have these relationships stored as separate elements, be it in the showroom or another XML document. Then you could simply perform a join or use a nested FLWOR expression to retrieve historical data.

To check if the attribute contains a given customer id:

let $carId := "3"
let $clientId := "56"
let $doc := fn:doc("c:\dev\xml\showroom.xml")
return fn:exists(fn:tokenize($doc/showroom/car[@id=$carId]/@history, ",")[.=$clientId])

She will return a Boolean value.

Published by: odie_63 on March 8, 2012 20:19

Tags: Oracle Development

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