Alpha Software Mobile Development Tools:   Alpha Anywhere    |   Alpha TransForm subscribe to our YouTube Channel  Follow Us on LinkedIn  Follow Us on Twitter  Follow Us on Facebook

Announcement

Collapse

The Alpha Software Forum Participation Guidelines

The Alpha Software Forum is a free forum created for Alpha Software Developer Community to ask for help, exchange ideas, and share solutions. Alpha Software strives to create an environment where all members of the community can feel safe to participate. In order to ensure the Alpha Software Forum is a place where all feel welcome, forum participants are expected to behave as follows:
  • Be professional in your conduct
  • Be kind to others
  • Be constructive when giving feedback
  • Be open to new ideas and suggestions
  • Stay on topic


Be sure all comments and threads you post are respectful. Posts that contain any of the following content will be considered a violation of your agreement as a member of the Alpha Software Forum Community and will be moderated:
  • Spam.
  • Vulgar language.
  • Quotes from private conversations without permission, including pricing and other sales related discussions.
  • Personal attacks, insults, or subtle put-downs.
  • Harassment, bullying, threatening, mocking, shaming, or deriding anyone.
  • Sexist, racist, homophobic, transphobic, ableist, or otherwise discriminatory jokes and language.
  • Sexually explicit or violent material, links, or language.
  • Pirated, hacked, or copyright-infringing material.
  • Encouraging of others to engage in the above behaviors.


If a thread or post is found to contain any of the content outlined above, a moderator may choose to take one of the following actions:
  • Remove the Post or Thread - the content is removed from the forum.
  • Place the User in Moderation - all posts and new threads must be approved by a moderator before they are posted.
  • Temporarily Ban the User - user is banned from forum for a period of time.
  • Permanently Ban the User - user is permanently banned from the forum.


Moderators may also rename posts and threads if they are too generic or do not property reflect the content.

Moderators may move threads if they have been posted in the incorrect forum.

Threads/Posts questioning specific moderator decisions or actions (such as "why was a user banned?") are not allowed and will be removed.

The owners of Alpha Software Corporation (Forum Owner) reserve the right to remove, edit, move, or close any thread for any reason; or ban any forum member without notice, reason, or explanation.

Community members are encouraged to click the "Report Post" icon in the lower left of a given post if they feel the post is in violation of the rules. This will alert the Moderators to take a look.

Alpha Software Corporation may amend the guidelines from time to time and may also vary the procedures it sets out where appropriate in a particular case. Your agreement to comply with the guidelines will be deemed agreement to any changes to it.



Bonus TIPS for Successful Posting

Try a Search First
It is highly recommended that a Search be done on your topic before posting, as many questions have been answered in prior posts. As with any search engine, the shorter the search term, the more "hits" will be returned, but the more specific the search term is, the greater the relevance of those "hits". Searching for "table" might well return every message on the board while "tablesum" would greatly restrict the number of messages returned.

When you do post
First, make sure you are posting your question in the correct forum. For example, if you post an issue regarding Desktop applications on the Mobile & Browser Applications board , not only will your question not be seen by the appropriate audience, it may also be removed or relocated.

The more detail you provide about your problem or question, the more likely someone is to understand your request and be able to help. A sample database with a minimum of records (and its support files, zipped together) will make it much easier to diagnose issues with your application. Screen shots of error messages are especially helpful.

When explaining how to reproduce your problem, please be as detailed as possible. Describe every step, click-by-click and keypress-by-keypress. Otherwise when others try to duplicate your problem, they may do something slightly different and end up with different results.

A note about attachments
You may only attach one file to each message. Attachment file size is limited to 2MB. If you need to include several files, you may do so by zipping them into a single archive.

If you forgot to attach your files to your post, please do NOT create a new thread. Instead, reply to your original message and attach the file there.

When attaching screen shots, it is best to attach an image file (.BMP, .JPG, .GIF, .PNG, etc.) or a zip file of several images, as opposed to a Word document containing the screen shots. Because Word documents are prone to viruses, many message board users will not open your Word file, therefore limiting their ability to help you.

Similarly, if you are uploading a zipped archive, you should simply create a .ZIP file and not a self-extracting .EXE as many users will not run your EXE file.
See more
See less

Calculated fields on forms - Dr. Wayne's Books

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    Calculated fields on forms - Dr. Wayne's Books

    Hi everybody - I am trying to do something I thought would be simple, but after 5 hours of trying and reading the bundled manuals and Dr. Wayne's two books, I'm baffled.

    I have a form based on a set with 3 tables. "Accounts" with a one-to-many relationship to "Positions" with a one-to-many relationship to "Transactions". The form works fine with each browse (Positions, Transactions)displaying only the linked rows from its parent table.

    I want to display the number of rows currently retrieved in each browse. Simple?

    Gary

    #2
    RE: Calculated fields on forms - Dr. Wayne's Books

    GarY:

    Rephrase the question and how to proceed becomes clearer.

    "How many linked records are there in each child table?"

    Use either the table.current or table get method to return a pointer to the table(s) and get the number of records. Since the set creates a query on linked child tables which is the current index for these tables you can obtain the number of child records linked to the current parent record.

    tbl = table.current(2) 'the first child
    indx = tbl.index_primary_get()
    records = indx.records_get()

    There probably is more elegant code but I found this first in the documentation. At least it illustrates the approach.

    Bill
    Bill Hanigsberg

    Comment


      #3
      RE: Calculated fields on forms - Dr. Wayne's Books

      Gary,
      Another way might be to create a calculated field with a formula like:

      count(Position->Position_id,GRP->Position)

      While in the form design, use the Drag-Drop list to create a new calculated field, It will be very easy to create. Use the advanced option to signify the group that you are counting.

      John

      Comment


        #4
        RE: Calculated fields on forms - Dr. Wayne's Books

        Bill, that syntax will give you a count of all the records in the file - not the number of records belonging to the parent.

        When I create a formal query, though, it gives me a correct count. I noticed that a long time ago - you have to use different syntax to get the number of child records belonging to a parent.

        Gary:
        I think you are saying that you have
        Parent
        --Child1 (1 to many to parent)
        ----Child2 (1 to many to child1)

        On your form, the first browse will display child records belonging to that parent. The second browse will display records belonging to the first browse record that has focus, and as you scroll the first browse, the second browse will refresh to display records belonging to the first. That is the way it is supposed to work.
        Cole Custom Programming - Terrell, Texas
        972 524 8714
        [email protected]

        ____________________
        "A young man who is not liberal has no heart, but an old man who is not conservative has no mind." GB Shaw

        Comment


          #5
          RE: Calculated fields on forms - Dr. Wayne's Books

          Have you tried the dbcount expressions. If link1 is the link from parent to child 1 and you have indexed child1 on the linking field, something like

          dbcount("child1.dbf","child1index","link1")

          should give the count of records in child 1 linked by link1.

          Similarly:

          dbcount("child2.dbf",child2index","link2")

          should give the count of records in child2 linked to child 1 by link2.

          If you want these in the parent and link2 isn't in the parent table, you may have to use a lookup expression in another calculated field to lookup the value of link2 from child 2 to use in manipulating a value in the parent.

          Comment


            #6
            RE: Calculated fields on forms - Dr. Wayne's Books

            Look at the "Invoice" form in the Invoice.adb that comes
            with the Samples for v4. There is a calculated field
            called "total" that totals the amount of the current invoice.
            The expression for the calculated field is
            total(Invoice_items->Extension,Grp->Invoice_Header)

            The way to interpret this calculation is "Total the
            'Extension' field for all records in 'Invoice_Items'
            that fall under the displayed 'Invoice_Header'".

            You can add a new calculated field,
            count(Invoice_items->Extension,Grp->Invoice_Header)
            that would show the count of the records in the child table.

            Bill Hanigsberg's method will work and, as John Zaleski
            pointed out, if you select "New Calculated/Summary field"
            from the dropdown list of fields in form design, A5 will
            try to help you create this calculation as well.

            Comment

            Working...
            X