Difference between revisions of "CURVAL()"
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==Products== | ==Products== | ||
| − | + | Lianja, Lianja Server | |
[[Category:Documentation]] | [[Category:Documentation]] | ||
[[Category:Functions]] | [[Category:Functions]] | ||
[[Category:Buffered Processing]] | [[Category:Buffered Processing]] | ||
[[Category:Buffered Processing Functions]] | [[Category:Buffered Processing Functions]] | ||
Revision as of 12:38, 7 December 2012
Purpose
Function to return field values directly from disk
Syntax
CURVAL(<expC> [, <workarea | alias>])
See Also
CURSORGETPROP(), CURSORSETPROP(), GETFLDSTATE(), OLDVAL(), TABLEREVERT(), TABLEUPDATE(), SETFLDSTATE()
Description
The CURVAL() function can be used to return one or more field values directly from disk. During buffered processing, this allows checks to be made for changes to the data, since the record was accessed. 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
Lianja, Lianja Server
