[teiid-issues] [JBoss JIRA] (TEIID-1819) Reading multi entity data from a single data file

[Peter Larsen (Commented) (JIRA)]

    [ https://issues.jboss.org/browse/TEIID-1819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12642005#comment-12642005 ] 

Peter Larsen commented on TEIID-1819:
-------------------------------------

There needs to be a way to set the values of A.id and B order_id. We cannot assume that the data file will contain information for relational referential integrity. It may simply be the sequence of things that indicates a relationship, so the B.order_id needs to be derived from A.id. 

Or did I misunderstand your statement here?  I'm simply talking about assigning the value to the B.order_id column. The join/relationship is of course done later on query.
                
> Reading multi entity data from a single data file
> -------------------------------------------------
>
>                 Key: TEIID-1819
>                 URL: https://issues.jboss.org/browse/TEIID-1819
>             Project: Teiid
>          Issue Type: Feature Request
>          Components: Query Engine
>    Affects Versions: 7.6
>         Environment: Any
>            Reporter: Peter Larsen
>            Assignee: Steven Hawkins
>
> A common problem for data files is the concept of multiple data sets inclosed in the same file. An example is a data file of accounts receivable orders. You'll export at least two logical entities: Orders and OrderLines. Each of the two entities have very different data sets; the relate (OrderLines belong to a particular Order) and there are a dynamic number of OrderLines per Order.
> A common way to differentiate is to put a special "record type" selector as the first field in each record. Ie. A and B. The load program will based on this selector apply different templates to map the columns, and it will also know that the OrderLines are associated with the Order above it and create that relation column ID in the out put.
> Example:
> ;selector=A,orderdate,ordernumber,customernumber,ordertotal,ordertax
> ;selector=B,lineno,itemno,description,quantity,priceach,pricetotal
> A,10-dec-2011,12345,3322,3000,222
> B,1,123,Sprockets Black,30,50,1500
> B,2,333,Sprockets Blue,300,5,1500
> A,11-dec-2011,12346,3311,.....
> etc. 

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