尝试从数据库检索密码值时出错

Question

First off, I understand there is probably a better way to access stored passwords. This is a basic project trying to prove a basic concept.

I am having problems trying to validate a users login with a database.

while(inputValue == null) {
            System.out.println(PASSWORD_MESSAGE);
            inputValue = in.nextLine();

            try {
                rs = statement.executeQuery(PASSWORD_QUERY);
                while(rs.next()) {
                    System.out.println("TEST");
                    if(inputValue.equals(rs.getString("password"))) {
                        passwordValue = inputValue;
                        password= true;
                        break;
                    } 
                    if(!inputValue.equals(rs.getString("password"))){
                        System.out.println(ERROR_MESSAGE);
                        inputValue = null;
                        break;
                    }
                }
            } catch(SQLException e) {
                e.printStackTrace();
            }
        }

the value PASSWORD_QUERY is ( SELECT password FROM project.account WHERE username='" + usernameValue + "' )

I have double checked this query in the database and it does work fine. my error happens at the while loop. In debug mode it never enters the while loop and the system.out message "TEST" never goes to the console.

Answer 1

The error was actually in the query to the db. The variable the query was using was a static variable. I did not realize that the variables value for a constant would never change.