ResultSet: Exception: set type is TYPE_FORWARD_ONLY — why?

Question

I have very simple code:

pstat=con.prepareStatement(\"select typeid from users where username=? and password=?\");             
pstat.setString(1, username);         


        

Answer 1

The type TYPE_FORWARD_ONLY means you can only move forward on the result set, not backward, so you get an exception when you try to go back with beforeFirst(). Instead you can either use the following prepareStatement(), which receives the resultset type as a parameter, or to do:

        pstat=con.prepareStatement("select typeid from users where username=? and password=?");             
        pstat.setString(1, username);
        pstat.setString(2, password);
        rs=pstat.executeQuery();
        int rowCount=0;

        while(rs.next())
        {
            rowCount++;
            typeID=rs.getInt(1);
        }