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  • EVAL

    I am building an application that is to be used for registering students and course management of 1 to 5 courses.
    I have a booking table with 2 series of relating fields:
    Kx_booked, where x can be 1 to 5
    Cx_granted, that relates to the Kx_booked field
    There is another field that holds the course indicator K1 through K5.
    In a first stage a reservation is made for a certain course and the Kx_booked field is set to true.
    At the end of a particular course, when it is confirmed that a student showed up and followed that course, the Cx_granted field is to be set to true. A script will be launched by a button push and will update the Cx_granted fields.
    The script works but after having another look I lost some confidence as to the use of the EVAL statement. Using the debugger didn't help me boosting my confidence again.


    dim invh as p
    dim tbl as p
    dim qry as p
    dim numbr as c
    dim recs as n
    dim kind as c
    dim kind2 as c
    invh=table.get("courses") 'Parent table in the set
    on error goto errors
    numbr=invh.Id 'Populate variable with course number fields from the courses table"booking") 'One of the child tables in the set
    query.decription="Number Item Lines"
    'ui_msg_box("",str(recs)+"") 'Can be commented out. Shows # child records relating to Invh table
    while .not. tbl.fetch_eof()
    kind = "C" + right(invh.K_connector,1) + "_granted"
    kind2 = alltrim(invh.K_connector)
    tbl.change_begin() 'Put child table into change mode
    eval("tbl." + var->kind) = var->kind2
    tbl.Course_Fin = .T.
    tbl.change_end(.t.) 'end the change mode
    tbl.fetch_next() 'fetch until last matching child record has been fetched
    end while
    tbl.close() 'close child table
    'set course to finished
    if invh.Id = var->numbr
    invh.Course_Fin = .T.
    invh.change_end(.t.) 'end change mode
    end if

    The result of the eval statement is .T. but looking at it I would have expected another value stored in kind2 = alltrim(invh.K_connector).

    Am I correct in my assuption?
    Jo Hulsen
    Dommel Valley Solutions
    The Netherlands

  • #2
    Re: EVAL

    The statement

    eval("tbl." + var->kind) = var->kind2

    assigns the value in var->kind2 to the designated table field. I suppose it evaluates to true if it succeeds.

    Run the script again and hit F12 until you reach

    eval("tbl." + var->kind) = var->kind2

    Fill in the example fields at the bottom left to see what values are present.
    There can be only one.


    • #3
      Re: EVAL


      Thanks for your explanation, including the private one.
      I did another run with the debugger and result is attached.
      I couldn't get the expression in as you suggested in line3 of your attachment. Nevertheless I believe it must be that the eval statement is resulting to .T.
      Equality is already there by means of equality in the digit portion(C1 versus K1), by this I mean that the correct fields are paired; Field C1_granted is paired by the value of var->kind2 (K1) with field K1_booked.

      So, looking back at the statement leads to the conclusion that the current result is sheer luck as I meant to set the field C1_granted to true.
      Forgot to mention that both fields involved are logical fields. Records handled by this script always have field K1_booked set to .T.
      The eval statement could look like this:
      eval("tbl." + var->kind) = .T.
      and lead to the same result I guess?

      Jo Hulsen
      Dommel Valley Solutions
      The Netherlands


      • #4
        Re: EVAL

        Something went wrong with the attachment.
        Jo Hulsen
        Dommel Valley Solutions
        The Netherlands


        • #5
          Re: EVAL

          The eval statement could look like this:
          eval("tbl." + var->kind) = .T.
          and lead to the same result I guess?
          There can be only one.