This method begins a local transaction with the specified isolation level.

Declaration

// C#
public OracleTransaction BeginTransaction(IsolationLevel isolationLevel);

Parameters

• isolationLevel

  The isolation level for the new transaction.

Return Value

An OracleTransaction object representing the new transaction.

Implements

IDbConnection

Exceptions

InvalidOperationException - A transaction has already been started.

ArgumentException - The isolationLevel specified is invalid.

Remarks

The following isolation levels are supported: IsolationLevel.ReadCommitted and IsolationLevel.Serializable.

Although the BeginTransaction method supports the IsolationLevel.Serializable isolation level, serializable transactions are not supported when using System.Transactions and TransactionScope.

Requesting other isolation levels causes an exception.

Remarks (.NET Stored Procedure)

Using this method in a .NET stored procedure for context connection causes a Not Supported exception.

Example

// C#
 
using System;
using System.Data;
using Oracle.DataAccess.Client; 
 
class BeginTransactionSample
{
  static void Main()
  {
    string constr = "User Id=scott;Password=tiger;Data Source=oracle";
    OracleConnection con = new OracleConnection(constr);
    con.Open();
 
    // Create an OracleCommand object using the connection object
    OracleCommand cmd = con.CreateCommand();
 
    // Start a transaction
    OracleTransaction txn = con.BeginTransaction(IsolationLevel.ReadCommitted);
 
    // Update EMP table
    cmd.CommandText = "update emp set sal = sal + 100";
    cmd.ExecuteNonQuery();
 
    // Rollback transaction
    txn.Rollback();
    Console.WriteLine("Transaction rolledback");
 
    // Clean up
    txn.Dispose();
    cmd.Dispose();
    con.Dispose();
  }
}