Question

I have a ClientsTable like that :

firstName lastName address idNumber userName password
         |        |       |        |        |
david      bowie    here    123     mick      jagger 
chuck      norris   there   456     steven    seagal

I want to get both the userName and the password of each row and verify it with the given parameters of my method :

public Person verifyClientExists(String username,String password) throws SQLException
{

    ResultSet results = this.m_statement.executeQuery("SELECT `userName` FROM `ClientsTable`");  
    while (results.next() == true)
    {
        // here I want to compare the retrieved data from 
                    // mysql with the "username" and "password" given in the prototype
    }



    return null;

} 

But with my current query I can only get one field .

How can I retrieve two fields?

Answer 1

Why not use

select username, password from clientstable

? And then your ResultSet interrogation is:

String username = results.getString("username");
String password = results.getString("password");

See the JDBC tutorial page on ResultSets. Note that I ask for the results by column name. It’s fractionally more robust than by asking for them by index (number). If I change the SQL statement (reorder query parameters) then the correct columns are still returned.

I hope you’re not storing cleartext passwords in those tables, btw! See here for more info on hashing and salts.