Query a column of data through IFS?

Question

We need to know how to query a column of data through iFS (if this is even possible). For instance, in our database, there is a table ODM_TEST with a column RELEVANT_LOCATION. To get the unique values, we'd just query in SQL:
SELECT DISTINCT(relevant_location) FROM odm_test
WHERE relevant_location is not null
ORDER BY relevant_location
Is there a way of doing that through the iFS API?
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Answer 1

You can use Selector or Search API of iFS to do the query. Selector is used for simple queries and Search is used for complex queries.
For example, page 8-9 of Developer Reference of iFS release 9.0.1 has an example of how to use a selector to do the following query -
SELECT * FROM ATTRIBUTE WHERE DATATYPE = BOOLEAN ORDER BY NAME DESC, REQUIRED
You can also fine examples of how to use Search classes in the same chapter.
I hope it helps.
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