Line Number in sequence for Order No

Question

HI,
I am using AIA Approach to Insert data from Legacy System to Target Sysytem(Database Adapter).
I need to insert line number in the database for eache OrderNo and for same repeated Order No, it shoud count plus 1 and if differnt Order number will come need to count from 1.
can we achieve this using XSLT by Grouping??
or
we need to do query in the databse?
I want to insert line no inthe field, if orderNo is already exist in the database it shoud count +1.
i.e. order no is 123 count as 1
if order no will repeate again as 123 count as 2
if there is diffferent order no come as "xyz" count again as 1
PLease Help me on this.
Thanks For Advance.
Edited by: 895089 on May 14, 2012 4:48 AM

Answer 1

This can be done in XSL OR in procedure on the DB side. Performance wise better to do in procedure as mentioned by other use. You can choose to go with DB or XSL approach depending on number of orders you are expecting in a single message. If it is going to be 100s or few thousand messages then keeping it in XSL is not a problem. But if you are planning tens or hundreds of thousands of orders in the same request then better do it in stored procedure.
How do you do in XSL?
1. Put a for each on every unique order no. You can use xsl:Key or xslt:distinct-values() for this.
2. Within for each unique value of order no, use position() function to pass line/order no as 1,2,3... etc. As soon as the loop moves to second iteration for the next unique order no, count will automatically start again from 1,2,3... and so on.
Apart from slightly slower processing time, another drawback from this approach is that the data in the XML you send to DB procedure will be sorted by order numbers. All orders with same number will appear together.
Another problem with this approach is that this will work only within one request, i.e. if the next request contains an order with same no which was already sent in a previous request, for this order the count will again start from 1. So if you want to keep the sequencing maintained across multiple requests, the easiest way to do is in the DB procedure where you can lookup in the table before inserting a new row and insert with next sequence of that order no.