diff options
Diffstat (limited to 'sql/sql_trigger.cc')
| -rw-r--r-- | sql/sql_trigger.cc | 155 |
1 files changed, 141 insertions, 14 deletions
diff --git a/sql/sql_trigger.cc b/sql/sql_trigger.cc index 1c4add27e57..fb9abc06f6b 100644 --- a/sql/sql_trigger.cc +++ b/sql/sql_trigger.cc @@ -1,4 +1,5 @@ -/* Copyright (C) 2004-2005 MySQL AB +/* + Copyright (c) 2004, 2011, Oracle and/or its affiliates. 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 @@ -11,7 +12,8 @@ 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 */ + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA +*/ #define MYSQL_LEX 1 @@ -19,6 +21,7 @@ #include "sp_head.h" #include "sql_trigger.h" #include "parse_file.h" +#include <mysys_err.h> /*************************************************************************/ @@ -293,6 +296,52 @@ private: /** + An error handler that catches all non-OOM errors which can occur during + parsing of trigger body. Such errors are ignored and corresponding error + message is used to construct a more verbose error message which contains + name of problematic trigger. This error message is later emitted when + one tries to perform DML or some of DDL on this table. + Also, if possible, grabs name of the trigger being parsed so it can be + used to correctly drop problematic trigger. +*/ +class Deprecated_trigger_syntax_handler : public Internal_error_handler +{ +private: + + char m_message[MYSQL_ERRMSG_SIZE]; + LEX_STRING *m_trigger_name; + +public: + + Deprecated_trigger_syntax_handler() : m_trigger_name(NULL) {} + + virtual bool handle_error(uint sql_errno, const char *message, + MYSQL_ERROR::enum_warning_level level, THD *thd) + { + if (sql_errno != EE_OUTOFMEMORY && + sql_errno != ER_OUT_OF_RESOURCES) + { + if(thd->lex->spname) + m_trigger_name= &thd->lex->spname->m_name; + if (m_trigger_name) + my_snprintf(m_message, sizeof(m_message), + "Trigger '%s' has an error in its body: '%s'", + m_trigger_name->str, message); + else + my_snprintf(m_message, sizeof(m_message), + "Unknown trigger has an error in its body: '%s'", + message); + return true; + } + return false; + } + + LEX_STRING *get_trigger_name() { return m_trigger_name; } + char *get_error_message() { return m_message; } +}; + + +/** Create or drop trigger for table. @param thd current thread context (including trigger definition in LEX) @@ -572,6 +621,8 @@ bool Table_triggers_list::create_trigger(THD *thd, TABLE_LIST *tables, LEX_STRING *trg_connection_cl_name; LEX_STRING *trg_db_cl_name; + if (check_for_broken_triggers()) + return true; /* Trigger must be in the same schema as target table. */ if (my_strcasecmp(table_alias_charset, table->s->db.str, @@ -845,7 +896,7 @@ static bool rm_trigger_file(char *path, const char *db, @param path char buffer of size FN_REFLEN to be used for constructing path to .TRN file. @param db trigger's database name - @param table_name trigger's name + @param trigger_name trigger's name @retval False success @@ -1306,12 +1357,11 @@ bool Table_triggers_list::check_n_load(THD *thd, const char *db, lex_start(thd); thd->spcont= NULL; - if (parse_sql(thd, & parser_state, creation_ctx)) - { - /* Currently sphead is always deleted in case of a parse error */ - DBUG_ASSERT(lex.sphead == 0); - goto err_with_lex_cleanup; - } + Deprecated_trigger_syntax_handler error_handler; + thd->push_internal_handler(&error_handler); + bool parse_error= parse_sql(thd, & parser_state, creation_ctx); + thd->pop_internal_handler(); + /* Not strictly necessary to invoke this method here, since we know that we've parsed CREATE TRIGGER and not an @@ -1322,6 +1372,52 @@ bool Table_triggers_list::check_n_load(THD *thd, const char *db, */ lex.set_trg_event_type_for_tables(); + if (parse_error) + { + if (!triggers->m_has_unparseable_trigger) + triggers->set_parse_error_message(error_handler.get_error_message()); + /* Currently sphead is always set to NULL in case of a parse error */ + DBUG_ASSERT(lex.sphead == 0); + if (error_handler.get_trigger_name()) + { + LEX_STRING *trigger_name; + const LEX_STRING *orig_trigger_name= error_handler.get_trigger_name(); + + if (!(trigger_name= alloc_lex_string(&table->mem_root)) || + !(trigger_name->str= strmake_root(&table->mem_root, + orig_trigger_name->str, + orig_trigger_name->length))) + goto err_with_lex_cleanup; + + trigger_name->length= orig_trigger_name->length; + + if (triggers->names_list.push_back(trigger_name, + &table->mem_root)) + goto err_with_lex_cleanup; + } + else + { + /* + The Table_triggers_list is not constructed as a list of + trigger objects as one would expect, but rather of lists of + properties of equal length. Thus, even if we don't get the + trigger name, we still fill all in all the lists with + placeholders as we might otherwise create a skew in the + lists. Obviously, this has to be refactored. + */ + LEX_STRING *empty= alloc_lex_string(&table->mem_root); + if (!empty) + goto err_with_lex_cleanup; + + empty->str= const_cast<char*>(""); + empty->length= 0; + if (triggers->names_list.push_back(empty, &table->mem_root)) + goto err_with_lex_cleanup; + } + lex_end(&lex); + continue; + } + lex.sphead->set_info(0, 0, &lex.sp_chistics, (ulong) *trg_sql_mode); int event= lex.trg_chistics.event; @@ -1362,8 +1458,8 @@ bool Table_triggers_list::check_n_load(THD *thd, const char *db, if (triggers->names_list.push_back(&lex.sphead->m_name, &table->mem_root)) - goto err_with_lex_cleanup; - + goto err_with_lex_cleanup; + if (!(on_table_name= alloc_lex_string(&table->mem_root))) goto err_with_lex_cleanup; @@ -1388,9 +1484,8 @@ bool Table_triggers_list::check_n_load(THD *thd, const char *db, char fname[SAFE_NAME_LEN + 1]; DBUG_ASSERT((!my_strcasecmp(table_alias_charset, lex.query_tables->db, db) || (check_n_cut_mysql50_prefix(db, fname, sizeof(fname)) && - !my_strcasecmp(table_alias_charset, lex.query_tables->db, fname))) && - (!my_strcasecmp(table_alias_charset, lex.query_tables->table_name, - table_name) || + !my_strcasecmp(table_alias_charset, lex.query_tables->db, fname)))); + DBUG_ASSERT((!my_strcasecmp(table_alias_charset, lex.query_tables->table_name, table_name) || (check_n_cut_mysql50_prefix(table_name, fname, sizeof(fname)) && !my_strcasecmp(table_alias_charset, lex.query_tables->table_name, fname)))); #endif @@ -1674,6 +1769,13 @@ bool Table_triggers_list::drop_all_triggers(THD *thd, char *db, char *name) while ((trigger= it_name++)) { + /* + Trigger, which body we failed to parse during call + Table_triggers_list::check_n_load(), might be missing name. + Such triggers have zero-length name and are skipped here. + */ + if (trigger->length == 0) + continue; if (rm_trigname_file(path, db, trigger->str)) { /* @@ -1897,6 +1999,11 @@ bool Table_triggers_list::change_table_name(THD *thd, const char *db, } if (table.triggers) { + if (table.triggers->check_for_broken_triggers()) + { + result= 1; + goto end; + } LEX_STRING old_table_name= { (char *) old_table, strlen(old_table) }; LEX_STRING new_table_name= { (char *) new_table, strlen(new_table) }; /* @@ -1985,6 +2092,9 @@ bool Table_triggers_list::process_triggers(THD *thd, sp_head *sp_trigger= bodies[event][time_type]; SELECT_LEX *save_current_select; + if (check_for_broken_triggers()) + return true; + if (sp_trigger == NULL) return FALSE; @@ -2064,6 +2174,23 @@ void Table_triggers_list::mark_fields_used(trg_event_type event) /** + Signals to the Table_triggers_list that a parse error has occured when + reading a trigger from file. This makes the Table_triggers_list enter an + error state flagged by m_has_unparseable_trigger == true. The error message + will be used whenever a statement invoking or manipulating triggers is + issued against the Table_triggers_list's table. + + @param error_message The error message thrown by the parser. + */ +void Table_triggers_list::set_parse_error_message(char *error_message) +{ + m_has_unparseable_trigger= true; + strnmov(m_parse_error_message, error_message, + sizeof(m_parse_error_message)-1); +} + + +/** Trigger BUG#14090 compatibility hook. @param[in,out] unknown_key reference on the line with unknown |