ObjectScript Tutorial
Exercise 7: Lookup Routine, final version
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  1. The final version of the lookup routine is shown below, broken into sections to help you understand it. This is also available in the SAMPLES namespace as lookup.mac.
  2. Add this code to the main section, after the following line: do getsubmit ; let user submit a string for lookup
        quit:(submit = "")
        do:(id '= 0) edit( id ) ; edit the chosen person
  3. The new edit procedure.
    edit(id) ; allow user to choose, and edit their choice
        {
        for {
            read !, "Edit? (y/n): " ,yn
            if yn '= "y" {
                write "...no changes."
                quit
                }
            ; try to lock the record
            lock +^PersonD( id ):5
            if $test { ; the lock was successful
                quit  }
            else {
                write "...someone else is editing this person" }
            }
        quit:(yn '= "y")
        do load( id )
        do reprompt()
        read !, "Store? (y/n): ", yn
        if yn '= "y" {
            write "...no changes."
            lock -^PersonD( id ) ; unlock the record
            quit
            }
        do update( id )
        lock -^PersonD( id ) ; unlock the record
        }
  4. The new load procedure.
    load(id) [rec, name, phone, intdob] ; load a person into local variables
        {
        set rec = ^PersonD(id)
        set name = $piece(rec, "^", 1)
        set phone = $piece(rec, "^", 2)
        set intdob = $piece(rec, "^", 3)
        }
  5. The updated display procedure, that now calls load.
    display(id, style) [name, phone, intdob] ; given an ID, get data and write it
        {
        do load( id )
        if style = "line" {
            write name, ?20, phone, ?35, $zdate(intdob, 2) }
        else {
            write # ; clear screen
            do display^datent()
            }
        }
  6. The new reprompt procedure.
    reprompt() [name, phone, intdob, newname, newphone, newintdob]
        ; show current data and allow user to update it
        {
        do {
            write !, "Name: ", name, "=> " read newname
            set:(newname = "") newname = name ; default
            set newname = $$validName^datent( newname )
            }
        while newname = 0
    
        do {
            write !, "Phone (617): ", phone, "=> " read newphone
            set:(newphone = "") newphone = phone ; default
            set newphone = $$validPhone^datent( newphone )
            }
        while newphone = 0
    
        do {
            write !, "DOB: ", $zdate(intdob, 2), "=> " read newdob
            set:(newdob = "") newdob = $zdate(intdob, 2) ; default
            set newintdob = $$validDOB^datent( newdob )
            }
        while newintdob = 0
    
        write !!
        }
  7. The new update procedure.
    update(id) [rec, name, phone, intdob, newname, newphone, newintdob]
        ; update ^PersonD and ^PersonI
        {
        ; concatenate the data into a record
        set newrec = newname _ "^" _ newphone _ "^" _ newintdob 
        
        if rec = newrec {
            write "...no changes made."
            quit
            }
        tstart  ; start a transaction
        set ^PersonD( id ) = newrec ; store the record
        if newname '= name { ; kill old name and add new name to index
            set ln = $piece(name, ",", 1), fn = $piece(name, ",", 2)
            set nln = $piece(newname, ",", 1), nfn = $piece(newname, ",", 2)
            kill ^PersonI("Name", ln, fn, id)
            set ^PersonI("Name", nln, nfn, id) = ""
            }
        if newphone '= phone { ; kill old phone and add new phone to index
            kill ^PersonI("Phone", phone)
            set ^PersonI("Phone", newphone) = id
            }
        if newintdob '= intdob { ; kill old dob and add new dob to index
            kill ^PersonI("DOB", intdob, id)
            set ^PersonI("DOB", newintdob, id) = ""
            }
        tcommit  ; commit the transaction
        write "...updated."
        }