Difference between revisions of "OLDVAL()"
From Lianjapedia
m (Text replace - "Recital" to "Lianja") |
Yvonne.milne (Talk | contribs) |
||
| (2 intermediate revisions by 2 users not shown) | |||
| Line 1: | Line 1: | ||
==Purpose== | ==Purpose== | ||
Function to to return original values for fields that may have been modified but not updated | Function to to return original values for fields that may have been modified but not updated | ||
| − | |||
==Syntax== | ==Syntax== | ||
OLDVAL(<expC> [, <workarea | alias>]) | OLDVAL(<expC> [, <workarea | alias>]) | ||
| − | |||
==See Also== | ==See Also== | ||
[[CURSORGETPROP()]], [[CURSORSETPROP()]], [[CURVAL()]], [[GETFLDSTATE()]], [[TABLEREVERT()]], [[TABLEUPDATE()]], [[SETFLDSTATE()]] | [[CURSORGETPROP()]], [[CURSORSETPROP()]], [[CURVAL()]], [[GETFLDSTATE()]], [[TABLEREVERT()]], [[TABLEUPDATE()]], [[SETFLDSTATE()]] | ||
| − | |||
==Description== | ==Description== | ||
| Line 15: | Line 12: | ||
If the optional <workarea | alias> is specified, then the function will operate in the required location. | If the optional <workarea | alias> is specified, then the function will operate in the required location. | ||
| − | |||
==Example== | ==Example== | ||
| Line 35: | Line 31: | ||
? "Fieldstate at start: " + getfldstate("customerid") | ? "Fieldstate at start: " + getfldstate("customerid") | ||
| − | replace customerid WITH " | + | replace customerid WITH "LIANJ" |
// Alter in another session | // Alter in another session | ||
| − | + | // update southwind!customers set customerid = 'MULTI' where recno() = 1 | |
? "Someone else just updated the record!" | ? "Someone else just updated the record!" | ||
? "New customerid value: " + customerid | ? "New customerid value: " + customerid | ||
| Line 51: | Line 47: | ||
? "Fieldstate after revert: " + getfldstate("customerid") | ? "Fieldstate after revert: " + getfldstate("customerid") | ||
| − | replace customerid WITH " | + | replace customerid WITH "LIANJ" |
? "New customerid value: " + customerid | ? "New customerid value: " + customerid | ||
tableupdate(.T.) | tableupdate(.T.) | ||
| Line 61: | Line 57: | ||
</code> | </code> | ||
| − | |||
| − | |||
| − | |||
[[Category:Documentation]] | [[Category:Documentation]] | ||
[[Category:Functions]] | [[Category:Functions]] | ||
| − | [[Category: | + | [[Category:Cursor Functions]] |
| − | + | ||
Latest revision as of 13:38, 19 May 2014
Contents
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 "LIANJ" // Alter in another session // 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 "LIANJ" ? "New customerid value: " + customerid tableupdate(.T.) ? "Updated customerid value: " + customerid ? "Curval(): " + curval("customerid") ? "Oldval(): " + oldval("customerid") ? "Fieldstate after replace and update: " + getfldstate("customerid") ?
