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Rolling back input done via insert into and replace cmds
Message
From
14/04/2003 11:35:05
 
 
To
14/04/2003 11:20:41
General information
Forum:
Visual FoxPro
Category:
Coding, syntax & commands
Miscellaneous
Thread ID:
00777224
Message ID:
00777243
Views:
12
>According to the help file, you cannot issue an INSERT command to a table involved in a BEGIN/END transaction. So I think if you have to stay with the insert, you're out of luck.

Where is that documented (I looked and I must have missed it).

What are the alternatives? Would a combination of Append blank and Replace be better?

>
>Alan
>
>>This is an existing application worked on by many people, now it's my turn. Basically it is an input form for issuing stock items.
>>VFP 7, Save data via a save button on a form, Dataseesion set to 2 (private), Buffering set to none, 3 shared tables are used, and ordered items are save in a temporary table on the user's PC. To save an issue slip the current approach is to
>>
>>1. get next slip number for requisitions header table
>>2. use instert into command to append a new record into the header table
>>3. a. scan temp items ordered table for stock number of ordered items
>> b. lock record in inventory table
>> c. use replace command to update inventory table (i.e. decrease amount on hand)
>> d. use insert into command append a record into detailed requitions table
>> e. unlock record in inventory table
>>
>>This contains no error checking and works 95% of the time, but occationally it fails. I would like to add checks to be sure all updates and appends work, but I am not sure of the best approach to do this. In particular how do I check if insert into commands worked and if it failed how to I rollback the entire process. For example
>>
>>1. Do I have to lock both the requisition header and detail tables, or since next issue slip number comes from the header table do lock just the requisions table?
>>2. Do I use tableupdate command after the insert into commands?
>>3. Does the rollback command also undo insert into commands?
>>4. Where do I need to use the tablerevert command?
>>
>>Any suggestions/help appreciated.
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