///

/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection
/// using the provided parameter values. This method will query the database to discover the parameters for the
/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
///

///
/// This method provides no access to output parameters or the stored procedure's return value parameter.
///
/// e.g.:
/// XmlReader r = ExecuteXmlReader(conn, "GetOrders", 24, 36);
///
/// A valid SqlConnection
/// The name of the stored procedure using "FOR XML AUTO"
/// An array of objects to be assigned as the input values of the stored procedure
/// An XmlReader containing the resultset generated by the command
public static XmlReader ExecuteXmlReader(SqlConnection connection, string spName, params object[] parameterValues)
{
if( connection == null ) throw new ArgumentNullException( "connection" );
if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

// If we receive parameter values, we need to figure out where they go
if ((parameterValues != null) && (parameterValues.Length > 0))
{
// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

// Assign the provided values to these parameters based on parameter order
AssignParameterValues(commandParameters, parameterValues);

// Call the overload that takes an array of SqlParameters
return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
// Otherwise we can just call the SP without params
return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);
}
}

///

/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction.
///

///
/// e.g.:
/// XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders");
///
/// A valid SqlTransaction
/// The CommandType (stored procedure, text, etc.)
/// The stored procedure name or T-SQL command using "FOR XML AUTO"
/// An XmlReader containing the resultset generated by the command
public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText)
{
// Pass through the call providing null for the set of SqlParameters
return ExecuteXmlReader(transaction, commandType, commandText, (SqlParameter[])null);
}

///

/// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
/// using the provided parameters.
///

///
/// e.g.:
/// XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
///
/// A valid SqlTransaction
/// The CommandType (stored procedure, text, etc.)
/// The stored procedure name or T-SQL command using "FOR XML AUTO"
/// An array of SqlParamters used to execute the command
/// An XmlReader containing the resultset generated by the command
public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if( transaction == null ) throw new ArgumentNullException( "transaction" );
if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );

// Create a command and prepare it for execution
SqlCommand cmd = new SqlCommand();
bool mustCloseConnection = false;
PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );

// Create the DataAdapter & DataSet
XmlReader retval = cmd.ExecuteXmlReader();

// Detach the SqlParameters from the command object, so they can be used again
cmd.Parameters.Clear();
return retval;
}

[@more@]