|Oracle® Objects for OLE Developer's Guide
11g Release 2 (11.2) for Microsoft Windows
|PDF · Mobi · ePub|
Unconditionally rolls back all transactions and clears the transaction mode initiated by
This method does not generate events or produce errors. Because the
ResetTrans method does not generate events, you cannot cancel the
ResetTrans method in a
Validate event, as you can with a rollback or commit operation.
Note: If an
OraDatabase object has been enlisted with Microsoft Transaction Server (MTS) and is part of a global MTS transaction, this method has no effect.
This example demonstrates the use of the
ResetTrans methods to group a set of dynaset edits into a single transaction. Copy and paste this code into the definition section of a form. Then, press F5.
Sub Form_Load () 'Declare variables Dim OraSession As OraSession Dim OraDatabase As OraDatabase Dim OraDynaset As OraDynaset 'Create the OraSession Object. Set OraSession = CreateObject("OracleInProcServer.XOraSession") 'Create the OraDatabase Object by opening a connection to Oracle. Set OraDatabase = OraSession.OpenDatabase("ExampleDb", "scott/tiger", 0&) 'Create the OraDynaset Object. Set OraDynaset = OraDatabase.CreateDynaset("select * from emp", 0&) 'Start Transaction processing. OraDynaset.Session.BeginTrans 'Traverse until EOF is reached, setting each employee's salary to zero. Do Until OraDynaset.EOF OraDynaset.Edit OraDynaset.Fields("sal").value = 0 OraDynaset.Update OraDynaset.MoveNext Loop MsgBox "All salaries set to ZERO." 'Currently, the changes have NOT been committed to the database. 'End Transaction processing. 'Using ResetTrans means the rollback cannot be canceled in the Validate event. OraDynaset.Session.ResetTrans MsgBox "Salary changes rolled back." End Sub