How to include the variable as a part of the sqlStatement in doGet Servlet

How can I get the variable empnum as a part of the sqlStatement. I am getting an error.
String empnum = req.getParameter("empnum"); --Works
out.println("THE empnum IS : " + empnum); -- Works
String dsJndi = "jdbc/OracleCoreDST"; -- Works
String sqlStatement = "select from HR_TABLE where HR_EMP_NUM=empnum";* - Works if empnum is hardcoded.
Thanks so much for the help in advance
KA

Thanks John..! Opened my eyes ;)
Was a bit reluctant with the users repeated basic questions - my bad and apologies.
It should have been
String sqlStatement = "select * from HR_TABLE where HR_EMP_NUM=?";
PreparedStatement pt = c.prepareStatement(sqlStatement);
pt.setInt(1, Integer.parseInt(empnum));
ResultSet rs = pt.executeQuery();though the 1st solution works..!
regards,
~K

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