OLDVAL()

Purpose

Function to to return original values for fields that may have been modified but not updated

Syntax

OLDVAL(<expC> [, <workarea | alias>])

See Also

CURSORGETPROP(), CURSORSETPROP(), CURVAL(), GETFLDSTATE(), TABLEREVERT(), TABLEUPDATE(), SETFLDSTATE()

Description

The OLDVAL() function can be used during buffered processing to return one or more field values from a record as they were prior to any uncommitted changes. The field or fields to be checked are specified in <expC>.

If the optional <workarea | alias> is specified, then the function will operate in the required location.

Example

close databases
clear
set exclusive off
open database southwind
use customers
// Set to known value before start
replace customerid with "ALFKI"
 
cursorsetprop("Buffering", 5, "customers")
messagebox("Buffering set to " +etos(cursorgetprop("Buffering")))
 
? "Original customerid value: " + customerid
? "Curval(): " + curval("customerid")
? "Oldval(): " + oldval("customerid")
? "Fieldstate at start: " + getfldstate("customerid")
 
replace customerid WITH "RECIT"
 
// Alter in another session
! recital -c "update southwind\!customers set customerid = 'MULTI' where recno() = 1"
? "Someone else just updated the record!"
? "New customerid value: " +  customerid 
? "Curval(): " + curval("customerid")
? "Oldval(): " + oldval("customerid")
? "Fieldstate after replace: " + getfldstate("customerid")
tablerevert(.T.)
 
? "Reverted customerid value: " +  customerid
? "Curval(): " + curval("customerid")
? "Oldval(): " + oldval("customerid")
? "Fieldstate after revert: " + getfldstate("customerid")
 
replace customerid WITH "RECIT"
? "New customerid value: " +  customerid 
tableupdate(.T.)
? "Updated customerid value: " +  customerid
? "Curval(): " + curval("customerid")
? "Oldval(): " + oldval("customerid")
? "Fieldstate after replace and update: " + getfldstate("customerid")
?

Products

Recital, Recital Server