java program to read excel/text and checks oracle database and emails missing records

I am looking for a java sample example which reads excel or text file and
 iterate through the records by forming hash map or other object. Forms a query and queries againest oracle database
and generates excel report of any missing records compared to excel/ text file records.Emails the missingrecords report.

I saw this example

http://www.roseindia.net/tutorial/java/poi/insertExcelFileData.html

But it is not complete on what I was looking. It is inserting instead of 'select' to check missing records.

It mentioned like

int k=stat.executeUpdate("insert into login(username,password) value('"+username+"','"+password+"')");

>>login(username,password)
 is login is the name of the table with columns names username,password in the paranthesis?

 Any ideas, suggestions, sample code, links, source code highly appreciated. Thanks in advance