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Delete Problem Revisited

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    #1

    Delete Problem Revisited

    I have marked certain records to be deleted, But when I issue:

    tbl.delete_range()

    all the records are deleted. Any ideas or suggestions?
    Tags: None
    #2
    RE: Delete Problem Revisited

    The delete_range() method takes a filter.
    t.delete_range("marked()=.t.")

    will delete the marked records from table t.

    Comment

      #3
      RE: Delete Problem Revisited

      Peter:

      I'm still not getting what I want. My code is:

      usershort = "100"
      a_tbl = table.open( "c:labdbasenamebase.dbf" , FILE_RW_EXCLUSIVE )
      a_tbl.fetch_first()

      WHILE .NOT. a_tbl.fetch_EOF()
      IF LEFT(a_tbl.Cnumber,3) usershort THEN
      a_tbl.change_begin()
      a_tbl.mark()
      a_tbl.change_end(.T.)
      END IF
      a_tbl.fetch_next()
      END WHILE


      a_tbl.delete_range("marked()=.t.")
      a_tbl.pack()
      a_tbl.close()

      When I run this code, I don't get 100% accuracy in the delete. I put a browse after the END WHILE, looked at the file, and I had marked correctly, but some records marked were not deleted, and some not marked are deleted.

      Any ideas or suggestions?

      You know, I put this loop together as a workaround because I couldn't get a variable in a range. All the example code for ranges show hard coded filters (no variables). For example:

      append.t_filter = "LEFT(XEUNUMBER,3)="100""

      I have a case where I need to create a table with all the transactions from a client. Each time through this code, it could be a different client. So, I can't hardcode the client code in the filter, I need to have a variable in the filter. Is that possible? I tried things like:

      usershort = "100"
      append.t_filter = "LEFT(XEUNUMBER,3)="+usershort

      Any ideas or suggestions about this?

      Comment

        #4
        RE: Delete Problem Revisited

        There have been several posts on this recently. You have to alternate single and double quotes to open and close them properly. I'll try as I remember it.

        append.t_filter = "LEFT(XEUNUMBER,3)=' "+usershort+" ' "
        There can be only one.

        Comment

          #5
          RE: Delete Problem Revisited

          Concerning the inaccurate deletes, I'd consider closing the table after you've marked the delete candidates.

          then have your script open the table again and delete the range.

          Are you doing this in a multi-user environment? If so, you might consider opening the table in exclusive mode both for the marking and for the deleting.

          -- tom

          Comment

            #6
            RE: Delete Problem Revisited

            If I understand your problem, you have a table from which you want
            to extract only those records pertaining to a specified customer.
            I had a similar problem in another context where I couldn't use a
            variable as a filter. With the help of Selwyn and Peter I created the
            following script, altered, I believe, to meet your situation.

            First declare cust as a global variable. Here is the code.

            Put this code on a button.

            cust=ui_get_text("Enter customer name") 'here you are prompted for the customer

            dim shared tbl as p
            dim query.options as c
            dim query.description as c
            dim query.order as c
            tbl=table.open("yourtable name")
            query.description = "Summary by Customer"
            query.order = "Customer" 'or whatever the fieldname where the cusomer name resides
            query.filter = "Customer='"+ cust +"'" ' note this construction is important
            query.options = ""
            ix = tbl.query_create()

            copy.db = "temp.dbf" 'this create atable called temp
            copy.set = ""
            copy.dd = .F. 'don't bother to copy the data dictionary
            copy.records = .T. 'yes, copy records
            copy.delete_o_dd = .T. 'including deleted records. you can make this false
            copy.fields = 3 'This specifies the number of fields to copy
            copy.field1 = "name" ' name of 1st field, etc
            copy.field2 = "month" ' if you have a lot of fields this can be onerous
            copy.field3 = "trips" ' however, you need to this once -also you only need
            tbl.copy() ' to copy the fields you need, not all of them
            file_add_to_db(copy.db) ' this actually adds the temp table to the database

            ix.drop() ' this drops the query
            'parent.show_all() I am not sure whether is necessay once the query
            ' is dropped.

            At this stage you should have a table (temp) containing the necessary records
            to do what you wish - reports etc. If not, let me know. There was another
            gimmick I used to do some further stuff.

            I hope this helps you in the right direction.

            Suggestion: when you download do any mods in your wp or notepad, before
            pasting it into Alpha. I find this easier at time than editing a script in
            Alpha.

            Comment

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