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Problems with 1->many relations and the grid using VFP 5.0
Message
Information générale
Forum:
Visual FoxPro
Catégorie:
Autre
Titre:
Problems with 1->many relations and the grid using VFP 5.0
Divers
Thread ID:
00009690
Message ID:
00009690
Vues:
111
In my test setup, I have one table that is related to a second table in a 1-> many relationship and the second table is related to the third in a 1->many relationship. The first table has one record, the second table has one record related to it and the third table has several records related to this record. When I run my test program, the grid shows the two rows. Some of the time, there are ** that correctly indicate the skipped records. Other times, there are **, but they do not reflect the data relationships. When I tried setting up the relationships using the data environment, I was never able to see more than one row in the grid (i.e., it showed the one record for each of the first two tables, but only the first record for the third table). Am I correct to assume that the properties in the grid are used to indicate a relationship where the records displayed in the grid are children of a table that is not part of the grid? In my situation, the lead table in the grid is the one that drives the other n tables that are part of the grid. I have spent some time checking out views and I don't think they will work for my situation. 1 - I need to be able to build the relationships at run time. The user configures which tables to display and where to display them. 2 - I need to be able to set skip to show how the various records are related. I have spent the last few days trying different alternatives. Here is the test prg that I have been using. I am beating my head against a wall and would really appreciate any more ideas. I would love to send the test setup to anyone that would be willing to try it. I am afraid that describing this situation is difficult on 'paper'. If anyone would be willing to discuss this with me, I would be happy to either call you at your convenience or have you call me. My number is (313) 761-4940 x 206. TIA Regards, Karen Lahey (313) 761-4940 x 206 *-------------------------------------------------------------------- * This program illustrates a problem in the VFP 5.0 Grid control. * The control seems to get its 1-many relationships confused some * of the time. * If you run this program, it will fail on the 2nd, 5th, 8th, ... * repetition. If you remove the indicated instruction, it fails * every 5th time instead of every 3rd time. * The correct behavior is for the grid to show two rows of three * cells: * 10 01 Surface... *** *** Rust * When the program fails, the grid displays: * 10 01 Surface... *** 01 *** * In the real program, from which this example was extracted with * much anguish, the results seem much more random. Failures always * consist of either asterisks in a cell that should show data, and/or * data repeated in a cell that should show asterisks. CLOSE DATA ALL SET EXACT OFF OPEN DATABASE AQuAdata SET DATABASE TO AQuAdata use dd_table select 0 && if this instruction removed, cycle goes from 3 to 5. use aqid select 0 use pfmodein set order to tag pfmodei1 select 0 use oppcrel set order to tag oppcrel1 set relation to partid+opid+prfuncid+oppcrelid into pfmodein additive select 0 use prfunc set order to tag prfun1 set relation to partid+opid+prfuncid into oppcrel additive set skip to oppcrel,pfmodein do form gridbug name oform linked wait window "done" release oform RETURN *--------------------------------------------------------------------
Karen E. Lahey
Huron Valley Software Consulting LLC
klahey@hvsc.com
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