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/* Copyright (C) 1995-2002 MySQL AB
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; either version 2 of the License, or
(at your option) any later version.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/**********************************************************************
This file contains the implementation of error and warnings related
- Whenever an error or warning occurred, it pushes it to a warning list
that the user can retrieve with SHOW WARNINGS or SHOW ERRORS.
- For each statement, we return the number of warnings generated from this
command. Note that this can be different from @@warning_count as
we reset the warning list only for questions that uses a table.
This is done to allow on to do:
INSERT ...;
SELECT @@warning_count;
SHOW WARNINGS;
(If we would reset after each command, we could not retrieve the number
of warnings)
- When client requests the information using SHOW command, then
server processes from this list and returns back in the form of
resultset.
Supported syntaxes:
SHOW [COUNT(*)] ERRORS [LIMIT [offset,] rows]
SHOW [COUNT(*)] WARNINGS [LIMIT [offset,] rows]
SELECT @@warning_count, @@error_count;
***********************************************************************/
#include "mysql_priv.h"
/*
Reset all warnings for the thread
SYNOPSIS
mysql_reset_errors()
thd Thread handle
IMPLEMENTATION
Don't reset warnings if this has already been called for this query.
This may happen if one gets a warning during the parsing stage,
in which case push_warnings() has already called this function.
*/
void mysql_reset_errors(THD *thd)
{
if (thd->query_id != thd->warn_id)
{
thd->warn_id= thd->query_id;
free_root(&thd->warn_root,MYF(0));
bzero((char*) thd->warn_count, sizeof(thd->warn_count));
thd->warn_list.empty();
}
}
/*
Push the warning/error to error list if there is still room in the list
SYNOPSIS
push_warning()
thd Thread handle
level Severity of warning (note, warning, error ...)
code Error number
msg Clear error message
*/
void push_warning(THD *thd, MYSQL_ERROR::enum_warning_level level, uint code,
const char *msg)
{
if (thd->query_id != thd->warn_id)
mysql_reset_errors(thd);
if (thd->warn_list.elements < thd->variables.max_error_count)
{
/*
The following code is here to change the allocation to not
use the thd->mem_root, which is freed after each query
*/
MEM_ROOT *old_root=my_pthread_getspecific_ptr(MEM_ROOT*,THR_MALLOC);
my_pthread_setspecific_ptr(THR_MALLOC, &thd->warn_root);
MYSQL_ERROR *err= new MYSQL_ERROR(code, level, msg);
if (err)
thd->warn_list.push_back(err);
my_pthread_setspecific_ptr(THR_MALLOC, old_root);
}
thd->warn_count[(uint) level]++;
thd->total_warn_count++;
}
/*
Send all notes, errors or warnings to the client in a result set
SYNOPSIS
mysqld_show_warnings()
thd Thread handler
levels_to_show Bitmap for which levels to show
DESCRIPTION
Takes into account the current LIMIT
RETURN VALUES
0 ok
1 Error sending data to client
*/
static const char *warning_level_names[]= {"Note", "Warning", "Error", "?"};
my_bool mysqld_show_warnings(THD *thd, ulong levels_to_show)
{
List<Item> field_list;
DBUG_ENTER("mysqld_show_errors");
field_list.push_back(new Item_empty_string("Level", 7));
field_list.push_back(new Item_int("Code",0,4));
field_list.push_back(new Item_empty_string("Message",MYSQL_ERRMSG_SIZE));
if (send_fields(thd,field_list,1))
DBUG_RETURN(1);
MYSQL_ERROR *err;
SELECT_LEX *sel= &thd->lex.select_lex;
ha_rows offset= sel->offset_limit, limit= sel->select_limit;
List_iterator_fast<MYSQL_ERROR> it(thd->warn_list);
while ((err= it++))
{
/* Skip levels that the user is not interested in */
if (!(levels_to_show & ((ulong) 1 << err->level)))
continue;
if (offset)
{
offset--;
continue;
}
thd->packet.length(0);
net_store_data(&thd->packet,warning_level_names[err->level]);
net_store_data(&thd->packet,(uint32) err->code);
net_store_data(&thd->packet,err->msg);
if (my_net_write(&thd->net,(char*)thd->packet.ptr(),thd->packet.length()))
DBUG_RETURN(1);
if (!--limit)
break;
}
send_eof(thd);
DBUG_RETURN(0);
}
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