[Solr Wiki] Update of "DataImportHandler" by MichaelWalker

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The "DataImportHandler" page has been changed by MichaelWalker.
The comment on this change is: Delta-import example used an invalid SQL query syntax of "==", which did not work in my testing. Changing to "=", which did work in Solr 1.4..
http://wiki.apache.org/solr/DataImportHandler?action=diff&rev1=237&rev2=238

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      <document name="products">
  	    <entity name="item" pk="ID"
                  query="select * from item"
-                 deltaImportQuery="select * from item where ID=='${dataimporter.delta.id}'"
+                 deltaImportQuery="select * from item where ID='${dataimporter.delta.id}'"
  		deltaQuery="select id from item where last_modified > '${dataimporter.last_index_time}'">
              <entity name="feature" pk="ITEM_ID"
                      query="select description as features from feature where item_id='${item.ID}'">