How to get userLogin by using email?

Public String getUserLoginByEmail(String email){

Connection connection = null;

PreparedStatement pstatement = null;

ResultSet resultSet = null; 

String sql = "select * from usr where usr_mail = ? AND usr_status = 'Active' ";

try {

connection = Platform.getOperationalDS.getConnection();

pstatement = connection.prepareStatement(sql);

prepareStatement.setString(1,email);

resultSet = prepareStatement.executeQuery();

if (resultSet.next()){

String userLogin = resultSet.getString("user_Login");

}

catch(Exception ex){

ex.printStackTrace();

}

finally{

try{

if(connection != null) {

connection.close();

}

if(pStatement != null) {

pStatement.close();

}

if(resultSet != null) {

resultSet.close();

}

}

catch(Exception ex2) {

System.out.println("Exception is : "+ex2.getMessage());

}

return userLogin;

}