Difference between revisions of "SET ROLLBACK"

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=SET ROLLBACK=
 
 
 
==Class==
 
Multi-User
 
 
 
 
==Purpose==
 
==Purpose==
 
Enable or disable automatic rollback
 
Enable or disable automatic rollback
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==See Also==
 
==See Also==
BEGIN/END TRANSACTION, ISMARKED(), RESET IN, ROLLBACK, COMPLETED(), ROLLBACK()
+
[[BEGIN TRANSACTION]], [[COMPLETED()]], [[END TRANSACTION]], [[ISMARKED()]], [[RESET IN]], [[ROLLBACK]], [[ROLLBACK()]]
  
  
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==Example==
 
==Example==
<pre>
+
<code lang="recital">
 
use setcomm
 
use setcomm
 
set rollback on
 
set rollback on
 +
 
begin transaction
 
begin transaction
delete first 15
+
    delete first 15
replace all t1 with (t2*t3)/100
+
    replace all t1 with (t2*t3)/100
list
+
    list
 
end transaction
 
end transaction
if completed()
+
 
dialog box "Transaction completed"
+
if completed()   && determine if the transaction was successful
 +
    dialog box "Transaction completed"
 
else
 
else
dialog box "Errors occurred during transaction"
+
    dialog box "Errors occurred during transaction"
endif</pre>
+
endif
 +
</code>
  
  
 
==Products==
 
==Products==
Recital Database Server, Recital Mirage Server, Recital Terminal Developer
+
Recital Server, Recital
 
[[Category:Documentation]]
 
[[Category:Documentation]]
 
[[Category:Commands]]
 
[[Category:Commands]]
[[Category:Set_Commands]]
+
[[Category:Set_Commands|ROLLBACK]]
 +
[[Category:Transaction Processing]]
 +
[[Category:Transaction Processing Set Commands]]

Latest revision as of 15:30, 25 November 2009

Purpose

Enable or disable automatic rollback


Syntax

SET ROLLBACK ON | OFF | (<expL>)


See Also

BEGIN TRANSACTION, COMPLETED(), END TRANSACTION, ISMARKED(), RESET IN, ROLLBACK, ROLLBACK()


Description

The SET ROLLBACK ON command invokes automatic rollback and recovery in all tables affected by transactions performed within a BEGIN TRANSACTION....END TRANSACTION block. A ’rollback’ causes record contents to be restored to their value before modification (e.g. at the time BEGIN TRANSACTION was issued). This is particularly useful if an error occurs during the execution of a program or if an Applications Data Dictionary validation constraint is not satisfied.

When BEGIN TRANSACTION is issued all currently open files and all files opened between BEGIN and END TRANSACTION will have Before Image Journaling invoked automatically. To disable rollback for a particular workarea, see the RESET IN command. Recital Corporation recommends the use of the SET ROLLBACK ON command to obtain automatic rollback and recovery on multi-statement transactions. By default, ROLLBACK is OFF.


Example

use setcomm
set rollback on
 
begin transaction
    delete first 15
    replace all t1 with (t2*t3)/100
    list
end transaction
 
if completed()    && determine if the transaction was successful
    dialog box "Transaction completed"
else
    dialog box "Errors occurred during transaction"
endif


Products

Recital Server, Recital