[hibernate-issues] [Hibernate-JIRA] Created: (HHH-3403) new ResultSetTransformer which converts a two columns of a result set into one big HashMap.

[Antony Stubbs (JIRA)]

new ResultSetTransformer which converts a two columns of a result set into one big HashMap.
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                 Key: HHH-3403
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3403
             Project: Hibernate3
          Issue Type: Patch
          Components: query-criteria
    Affects Versions: 3.3.0.CR1
            Reporter: Antony Stubbs
            Priority: Minor
         Attachments: PassThroughTransformer.java, ResultElementTransformer.java, resultrow-to-mapentry.rar

This patch introduces a new ResultSetTransformer which converts a two column result set into a HashMap.

I realised when trying to integrate it into the Hibernate package that I would have to remove the Generics which is a shame. 

Wasn't sure where to house the test case as there seem to be no direct tests of ResultTransformer type code, so I added a new test package and put it there.

The first result column should contain unique values. Any non-unique values will cause the hash map to overwrite the previous value stored in the hash map.

A usage example might be to easily convert a country code lookup table into a hashmap.

The closest existing transformer AliasToEntityMapResultTransformer converts a result map into a list of hash maps contain key/value pairs for the column name / value, as opposed to this patch which creates one large map, vertically instead of horizontally you could say.

"A Result Transformer which generates a map of the results. Useful for use
with lookup tables or simple key value pair tables. For example, with a
country codes to names table you could use the result like this:
result.get("nz") would return "New Zealand"."

I've attached the project I made it in, from which you should just be able to take the class files.

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