Java JDBC PreparedStatement我如何检查空行

Question

I am implementing a forgot_password type feature on my application and I can not find how to check if I have any rows returned. The user first enters his/her email and then I search the database if the email is found proceed otherwise stop and tell them their email has not been found; This is my code

           Connection dbConnection=null;


                    dbConnection= DB.getConnection();
            PreparedStatement preparedStatement= dbConnection.prepareStatement("Select email,password from profiles where email=?");
                preparedStatement.setString(1, User_Email);
           preparedStatement.executeQuery();
// This code is not working below empty null rows still say email found
 if(preparedStatement==null)           
{
    return ok("Email not found");
}
else
{
 return ok("Email Found");
 }

The User_Email string works correctly and I have verified but it seems that

preparedStatement==null does nothing

Answer 1

Nah, you're going about it the wrong way. executeQuery() returns a ResultSet . You just need to check if ResultSet has rows.

    ResultSet rs = preparedStatement.executeQuery();
    if (rs.next()) {
         //example
        String email = rs.getString(1);
        String pw = rs.getString(2);
    }
    else{
         //no results!!
    }