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Steven Hawkins updated TEIID-1819:
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Fix Version/s: 8.0
Putting into 8.0 as there was not sufficient time to get into 7.6. Any more feedback on
the expected format of header lines when using a selector? I am only asking for
clarification because through just cursory searches I cannot find any examples using a
;selector= prefix.
I'll also assume that the having no parent value would populate null values for any
parent fields referenced.
Reading multi entity data from a single data file
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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
Fix For: 8.0
Attachments: selector.patch
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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