# File lib/dbi/handles/statement.rb, line 72
        def bind_coltype(pos, type)
            sanity_check({:prepared => true, :executed => true})
            
            coltypes = column_types

            if (pos - 1) < 0
                raise InterfaceError, "bind positions index starting at 1"
            end

            coltypes[pos-1] = type
            @row = DBI::Row.new(column_names, coltypes, nil, @convert_types)
        end