This method rolls back a database transaction.

Declaration

// C#
public override void Rollback();

Implements

IDbTransaction

Exceptions

InvalidOperationException - The transaction has already been completed successfully, has been rolled back, or the associated connection is closed.

Remarks

After a Rollback(), the OracleTransaction object can no longer be used because the Rollback ends the transaction.

Example

// Database Setup, if you have not done so yet.
/*
connect scott/tiger@oracle
DROP TABLE MyTable;
CREATE TABLE MyTable (MyColumn NUMBER);
 
*/
 
// C#
 
using System;
using System.Data;
using Oracle.DataAccess.Client; 
 
class RollbackSample
{
  static void Main()
  {
    // Drop & Create MyTable as indicated previously in Database Setup
    
    // This sample starts a transaction and inserts one record into MyTable.
    // It then rollsback the transaction, the number of rows remains the same
 
    string constr = "User Id=scott;Password=tiger;Data Source=oracle";
    OracleConnection con = new OracleConnection(constr);
    con.Open();
 
    OracleCommand cmd = con.CreateCommand();
 
    // Check the number of rows in MyTable before transaction
    cmd.CommandText = "SELECT COUNT(*) FROM MyTable";    
    int myTableCount = int.Parse(cmd.ExecuteScalar().ToString());
 
    // Print the number of rows in MyTable
    Console.WriteLine("myTableCount = " + myTableCount);
 
    // Start a transaction
    OracleTransaction txn = con.BeginTransaction(
      IsolationLevel.ReadCommitted);
 
    // Insert a row into MyTable
    cmd.CommandText = "INSERT INTO MyTable VALUES (1)";
    cmd.ExecuteNonQuery();
 
    // Rollback the transaction
    txn.Rollback();
 
    // Check the number of rows in MyTable after transaction
    cmd.CommandText = "SELECT COUNT(*) FROM MyTable";
    myTableCount = int.Parse(cmd.ExecuteScalar().ToString());
 
    // Prints the number of rows, should remain the same
    Console.WriteLine("myTableCount = " + myTableCount);
 
    txn.Dispose();
    cmd.Dispose();
 
    con.Close();
    con.Dispose();
  }
}