/* 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; 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., 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" #include "sp_rcontext.h" /* Store a new message in an error object This is used to in group_concat() to register how many warnings we actually got after the query has been executed. */ void MYSQL_ERROR::set_msg(THD *thd, const char *msg_arg) { msg= strdup_root(&thd->warn_root, msg_arg); } /* Reset all warnings for the thread SYNOPSIS mysql_reset_errors() thd Thread handle force Reset warnings even if it has been done before 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, bool force) { DBUG_ENTER("mysql_reset_errors"); if (thd->query_id != thd->warn_id || force) { thd->warn_id= thd->query_id; free_root(&thd->warn_root,MYF(0)); bzero((char*) thd->warn_count, sizeof(thd->warn_count)); if (force) thd->total_warn_count= 0; thd->warn_list.empty(); thd->row_count= 1; // by default point to row 1 } DBUG_VOID_RETURN; } /* 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 RETURN pointer on MYSQL_ERROR object */ MYSQL_ERROR *push_warning(THD *thd, MYSQL_ERROR::enum_warning_level level, uint code, const char *msg) { MYSQL_ERROR *err= 0; DBUG_ENTER("push_warning"); DBUG_PRINT("enter", ("code: %d, msg: %s", code, msg)); if (level == MYSQL_ERROR::WARN_LEVEL_NOTE && !(thd->options & OPTION_SQL_NOTES)) DBUG_RETURN(0); if (thd->query_id != thd->warn_id && !thd->spcont) mysql_reset_errors(thd, 0); thd->got_warning= 1; /* Abort if we are using strict mode and we are not using IGNORE */ if ((int) level >= (int) MYSQL_ERROR::WARN_LEVEL_WARN && thd->really_abort_on_warning()) { /* Avoid my_message() calling push_warning */ bool no_warnings_for_error= thd->no_warnings_for_error; sp_rcontext *spcont= thd->spcont; thd->no_warnings_for_error= 1; thd->spcont= 0; thd->killed= THD::KILL_BAD_DATA; my_message(code, msg, MYF(0)); thd->spcont= spcont; thd->no_warnings_for_error= no_warnings_for_error; /* Store error in error list (as my_message() didn't do it) */ level= MYSQL_ERROR::WARN_LEVEL_ERROR; } if (thd->spcont && thd->spcont->handle_error(code, level, thd)) { DBUG_RETURN(NULL); } query_cache_abort(&thd->net); if (thd->warn_list.elements < thd->variables.max_error_count) { /* We have to use warn_root, as mem_root is freed after each query */ if ((err= new (&thd->warn_root) MYSQL_ERROR(thd, code, level, msg))) thd->warn_list.push_back(err, &thd->warn_root); } thd->warn_count[(uint) level]++; thd->total_warn_count++; DBUG_RETURN(err); } /* Push the warning/error to error list if there is still room in the list SYNOPSIS push_warning_printf() thd Thread handle level Severity of warning (note, warning, error ...) code Error number msg Clear error message */ void push_warning_printf(THD *thd, MYSQL_ERROR::enum_warning_level level, uint code, const char *format, ...) { va_list args; char warning[ERRMSGSIZE+20]; DBUG_ENTER("push_warning_printf"); DBUG_PRINT("enter",("warning: %u", code)); va_start(args,format); my_vsnprintf(warning, sizeof(warning), format, args); va_end(args); push_warning(thd, level, code, warning); DBUG_VOID_RETURN; } /* 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 FALSE ok TRUE Error sending data to client */ const LEX_STRING warning_level_names[]= { { C_STRING_WITH_LEN("Note") }, { C_STRING_WITH_LEN("Warning") }, { C_STRING_WITH_LEN("Error") }, { C_STRING_WITH_LEN("?") } }; bool mysqld_show_warnings(THD *thd, ulong levels_to_show) { List<Item> field_list; DBUG_ENTER("mysqld_show_warnings"); field_list.push_back(new Item_empty_string("Level", 7)); field_list.push_back(new Item_return_int("Code",4, MYSQL_TYPE_LONG)); field_list.push_back(new Item_empty_string("Message",MYSQL_ERRMSG_SIZE)); if (thd->protocol->send_fields(&field_list, Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF)) DBUG_RETURN(TRUE); MYSQL_ERROR *err; SELECT_LEX *sel= &thd->lex->select_lex; SELECT_LEX_UNIT *unit= &thd->lex->unit; ha_rows idx= 0; Protocol *protocol=thd->protocol; unit->set_limit(sel); 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 (++idx <= unit->offset_limit_cnt) continue; if (idx > unit->select_limit_cnt) break; protocol->prepare_for_resend(); protocol->store(warning_level_names[err->level].str, warning_level_names[err->level].length, system_charset_info); protocol->store((uint32) err->code); protocol->store(err->msg, strlen(err->msg), system_charset_info); if (protocol->write()) DBUG_RETURN(TRUE); } send_eof(thd); DBUG_RETURN(FALSE); }