Re: Is there any get column method?
Re: Is there any get column method?
- Subject: Re: Is there any get column method?
- From: Kevin Xiaowen Ren <email@hidden>
- Date: Wed, 14 Jul 2004 12:23:42 +1200
rawRowSpec.setRawRowKeyPaths(attributesToFetch);
it's returning an array of dictionaries not only the values.
kevin
At 19:34 13/07/2004 -0400, you wrote:
Hi Kevin,
When you use a regular fetch specification, EOF fetches the whole row
because it will instantiate a new enterprise object for that row.
Obviously, when you're working with objects, it doesn't make sense to only
have a subset of its values available, so that's why it all columns are
returned from the fetch. When you're dealing with EOF, it's best to think
in terms of objects and attributes, not tables and columns.
However, for those cases where you really just need a subset of the data
and want to fetch a single column rather than the whole row, you'll need
to fetch raw rows. Try something like this:
EOFetchSpecification rawRowSpec = new EOFetchSpecification(myQual, null,
null);
rawRowSpec.setFetchesRawRows(true);
NSArray attributesToFetch = new NSArray("myAttributeKeyName");
rawRowSpec.setRawRowKeyPaths(attributesToFetch);
This fetch specification will return you an array of NSDictionaries
containing only the column(s) you specified in setRawRowKeyPaths().
I hope that helps,
Colin
On Tuesday, July 13, 2004, at 06:53 PM, Kevin Xiaowen Ren wrote:
Hi,
When I use EOQualifier, it's always return the whole raw from table.
Is there any API to get column from table?
Thanks,
kevin
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---
Colin Clark
Dynamic Web and Database Development Lead,
Resource Centre for Academic Technology,
University of Toronto
Kevin Xiaowen Ren
Programmer
Black Albatross
64-3- 479 5468
www.blackalbatross.com
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