Difference between revisions of "TABLEREVERT()"
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==Purpose== | ==Purpose== | ||
Function to discard changes and restore OLDVAL() or currect disk data during buffered processing | Function to discard changes and restore OLDVAL() or currect disk data during buffered processing | ||
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==Syntax== | ==Syntax== | ||
TABLEREVERT(<expL> | <expN> [, <workarea | alias>]) | TABLEREVERT(<expL> | <expN> [, <workarea | alias>]) | ||
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==See Also== | ==See Also== | ||
[[CURSORGETPROP()]], [[CURSORSETPROP()]], [[CURVAL()]], [[GETFLDSTATE()]], [[OLDVAL()]], [[TABLEUPDATE()]], [[SETFLDSTATE()]] | [[CURSORGETPROP()]], [[CURSORSETPROP()]], [[CURVAL()]], [[GETFLDSTATE()]], [[OLDVAL()]], [[TABLEUPDATE()]], [[SETFLDSTATE()]] | ||
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==Description== | ==Description== | ||
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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. | ||
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==Example== | ==Example== | ||
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? | ? | ||
</code> | </code> | ||
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==Products== | ==Products== | ||
Revision as of 11:16, 12 December 2012
Purpose
Function to discard changes and restore OLDVAL() or currect disk data during buffered processing
Syntax
TABLEREVERT(<expL> | <expN> [, <workarea | alias>])
See Also
CURSORGETPROP(), CURSORSETPROP(), CURVAL(), GETFLDSTATE(), OLDVAL(), TABLEUPDATE(), SETFLDSTATE()
Description
The TABLEREVERT() function is used to discard changes and restore OLDVAL() or currect disk data during buffered processing. If <expL> is .T. or <expN> 1 (True), TABLEREVERT() applies to all rows. If <expL> is .F. or <expN> 0 (False), TABLEREVERT() only applies to the current row.
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
