How to connect oracle and c# using namespace System.Data.OracleClient

Hi!
I am using Microsoft Visual Studio 2005 and Orange for oracle version 4.
I've been given a task, show the table of the database using datagrid.
but first I have to connect to the database using namespace System.Data.OracleClient.
What should I do? I am totally new in c# and oracle.
Thanks in advance. :)

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// #define ENABLE_TRANSACTION // failure is 'rollback not working'
#define ENABLE_TRANSACTION_SCOPE // failure is 'no output parameter value'
using System;
using System.Collections.Generic;
using System.Data;
using System.Text;
using System.Data.OracleClient;
#if ENABLE_TRANSACTION_SCOPE
using System.Transactions;
#endif
namespace TestOracleTransaction
class Program
static void Main(string[] args)
#if ENABLE_TRANSACTION_SCOPE
using (TransactionScope scope = new TransactionScope())
#endif
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using (OracleConnection connection = new OracleConnection(connectionString))
try
connection.Open();
#if ENABLE_TRANSACTION
using (OracleTransaction transaction = connection.BeginTransaction())
#endif
try
#if ENABLE_TRANSACTION_SCOPE
if (Transaction.Current == null)
throw new ArgumentException("no ambient transaction found for OracleClient");
#endif
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#if ENABLE_TRANSACTION
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#endif
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param.Direction = ParameterDirection.Input;
param.DbType = DbType.Int64;
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command.Parameters.Add(param);
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param.Direction = ParameterDirection.Input;
param.DbType = DbType.Int64;
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param.Direction = ParameterDirection.Input;
param.DbType = DbType.String;
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command.Parameters.Add(param);
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command.Parameters.Add(param);
int count = command.ExecuteNonQuery();
object value = command.Parameters["p_gateway_info_id"].Value;
long id = (value == DBNull.Value) ? -1 : Convert.ToInt64(value);
if (id < 0)
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throw new ArgumentException("no return value");
#if ENABLE_TRANSACTION
// FAILURE - rollback doesn't work when Transaction enabled
transaction.Rollback();
#endif
#if ENABLE_TRANSACTION_SCOPE
scope.Complete();
#endif
catch (Exception ex)
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}

Hi,
First, this is not the place for questions with System.Data.OracleClient, this is the Oracle Data Provider for .NET forum. Having said that I went ahead and tested your code with some slight modifications because you did not provide the stored procedure information. I am assuming your stored procedure is doing some sort of DML since you are using transactions and attempting to commit and rollback.
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Observations
========
When using transaction scope, a distributed transactions was executed and the data was inserted and returned in the output variable.
From console
p1 value is Hello World
From SQL Plus
SQL> select * from foo;
C1
Hello World
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The code I posted at this point is using local transaction and calling transaction.commit(), rollback is commented out. But I tested all scenarios and they worked as expected.
HTH
Jenny
#define ENABLE_TRANSACTION // failure is 'rollback not working'
//#define ENABLE_TRANSACTION_SCOPE // failure is 'no output parameter value'
using System;
using System.Collections.Generic;
using System.Data;
using System.Text;
using System.Data.OracleClient;
#if ENABLE_TRANSACTION_SCOPE
using System.Transactions;
#endif
create table foo (c1 varchar2(50));
create or replace procedure getstr (p1 out varchar2) as
begin
insert into foo(c1) values ('Hello World') returning c1 into p1;
end;
namespace TestOracleTransaction
class Program
static void Main(string[] args)
#if ENABLE_TRANSACTION_SCOPE
using (TransactionScope scope = new TransactionScope())
#endif
string connectionString = "Data Source=orcl;User ID=scott;Password=tiger";
using (OracleConnection connection = new OracleConnection(connectionString))
try
connection.Open();
#if ENABLE_TRANSACTION
using (OracleTransaction transaction = connection.BeginTransaction())
#endif
try
#if ENABLE_TRANSACTION_SCOPE
if (Transaction.Current == null)
throw new ArgumentException("no ambient transaction found for OracleClient");
#endif
OracleCommand command = connection.CreateCommand();
#if ENABLE_TRANSACTION
command.Transaction = transaction;
#endif
command.CommandType = CommandType.StoredProcedure;
command.CommandText = "SCOTT.GETSTR";
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param.ParameterName = "p1";
param.Direction = ParameterDirection.Output;
param.DbType = DbType.AnsiString;
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command.Parameters.Add(param);
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object value = command.Parameters["p1"].Value;
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// FAILURE - rollback doesn't work when Transaction enabled
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//transaction.Rollback();
#endif
#if ENABLE_TRANSACTION_SCOPE
scope.Complete();
#endif
catch (Exception ex)
System.Console.WriteLine("ERROR: " + ex.Message);
#if ENABLE_TRANSACTION
transaction.Rollback();
#endif
finally
if (connection.State == ConnectionState.Open)
connection.Close();
}

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How to connect oracle and c# using namespace System.Data.OracleClient

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