Your delta query i.e. 
deltaQuery ="select distinct clai_idn as clai_idn from claim_history where      
                                                 
clai_idn=29">

always gets only one row with a fixed "clai_idn". So here you fetch the same
row. What you would want is to get all rows after a particular time, for
that you may want to include timestamp in your deltaQuery as in the eg.
here:
http://wiki.apache.org/solr/DataImportHandler#Delta-Import_Example
<http://wiki.apache.org/solr/DataImportHandler#Delta-Import_Example>  




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