~drizzle-trunk/drizzle/development

/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-

 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:

 *

 *  Copyright (C) 2008-2009 Sun Microsystems

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; version 2 of the License.

 *

 *  This program is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *  GNU General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program; if not, write to the Free Software

 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

#include "drizzled/global.h"

#include "drizzled/session.h"

#include "drizzled/diagnostics_area.h"

/**

  Clear this diagnostics area.

  Normally called at the end of a statement.

*/

void Diagnostics_area::reset_diagnostics_area()

{

  can_overwrite_status= false;

  /** Don't take chances in production */

  m_message[0]= '\0';

  m_sql_errno= 0;

  m_server_status= 0;

  m_affected_rows= 0;

  m_last_insert_id= 0;

  m_total_warn_count= 0;

  is_sent= false;

  /** Tiny reset in debug mode to see garbage right away */

  m_status= DA_EMPTY;

}

/**

  Set OK status -- ends commands that do not return a

  result set, e.g. INSERT/UPDATE/DELETE.

*/

void Diagnostics_area::set_ok_status(Session *session, ha_rows affected_rows_arg,

                                uint64_t last_insert_id_arg,

                                const char *message_arg)

{

  assert(! is_set());

  /*

    In production, refuse to overwrite an error or a custom response

    with an OK packet.

  */

  if (is_error() || is_disabled())

    return;

  /** Only allowed to report success if has not yet reported an error */

  m_server_status= session->server_status;

  m_total_warn_count= session->total_warn_count;

  m_affected_rows= affected_rows_arg;

  m_last_insert_id= last_insert_id_arg;

  if (message_arg)

    strncpy(m_message, message_arg, sizeof(m_message) - 1);

  else

    m_message[0]= '\0';

  m_status= DA_OK;

}

/**

  Set EOF status.

*/

void Diagnostics_area::set_eof_status(Session *session)

{

  /** Only allowed to report eof if has not yet reported an error */

  assert(! is_set());

  /*

    In production, refuse to overwrite an error or a custom response

    with an EOF packet.

  */

  if (is_error() || is_disabled())

    return;

  m_server_status= session->server_status;

  /*

    If inside a stored procedure, do not return the total

    number of warnings, since they are not available to the client

    anyway.

  */

  m_total_warn_count= session->total_warn_count;

  m_status= DA_EOF;

}

/**

  Set ERROR status.

*/

void Diagnostics_area::set_error_status(Session *,

                                   uint32_t sql_errno_arg,

                                   const char *message_arg)

{

  /*

    Only allowed to report error if has not yet reported a success

    The only exception is when we flush the message to the client,

    an error can happen during the flush.

  */

  assert(! is_set() || can_overwrite_status);

  /*

    In production, refuse to overwrite a custom response with an

    ERROR packet.

  */

  if (is_disabled())

    return;

  m_sql_errno= sql_errno_arg;

  strncpy(m_message, message_arg, sizeof(m_message) - 1);

  m_status= DA_ERROR;

}

/**

  Mark the diagnostics area as 'DISABLED'.

  This is used in rare cases when the COM_ command at hand sends a response

  in a custom format. One example is the query cache, another is

  COM_STMT_PREPARE.

*/

void Diagnostics_area::disable_status()

{

  assert(! is_set());

  m_status= DA_DISABLED;

}