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Fix for bug #13525 "Rename table does not keep info of triggers".

Browse Source 
Let us transfer triggers associated with table when we rename it (but only if
we are not changing database to which table belongs, in the latter case we will
emit error).
This commit is contained in:
dlenev@mysql.com 2006-02-24 23:50:36 +03:00
parent 2f1614a9c1
commit 0c15039e74
7 changed files with 513 additions and 36 deletions
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103
mysql-test/r/trigger.result
View File

@ -1,4 +1,4 @@
drop table if exists t1, t2, t3;
drop table if exists t1, t2, t3, t4;
drop view if exists v1;
drop database if exists mysqltest;
drop function if exists f1;
@ -786,3 +786,104 @@ create trigger test.t1_bi before insert on t1 for each row set @a:=0;
ERROR 3D000: No database selected
drop trigger t1_bi;
ERROR 3D000: No database selected
create table t1 (id int);
create trigger t1_bi before insert on t1 for each row set @a:=new.id;
insert into t1 values (101);
select @a;
@a
101
select trigger_schema, trigger_name, event_object_schema,
event_object_table, action_statement from information_schema.triggers
where event_object_schema = 'test';
trigger_schema trigger_name event_object_schema event_object_table action_statement
test t1_bi test t1 set @a:=new.id
rename table t1 to t2;
insert into t2 values (102);
select @a;
@a
102
select trigger_schema, trigger_name, event_object_schema,
event_object_table, action_statement from information_schema.triggers
where event_object_schema = 'test';
trigger_schema trigger_name event_object_schema event_object_table action_statement
test t1_bi test t2 set @a:=new.id
alter table t2 rename to t3;
insert into t3 values (103);
select @a;
@a
103
select trigger_schema, trigger_name, event_object_schema,
event_object_table, action_statement from information_schema.triggers
where event_object_schema = 'test';
trigger_schema trigger_name event_object_schema event_object_table action_statement
test t1_bi test t3 set @a:=new.id
alter table t3 rename to t4, add column val int default 0;
insert into t4 values (104, 1);
select @a;
@a
104
select trigger_schema, trigger_name, event_object_schema,
event_object_table, action_statement from information_schema.triggers
where event_object_schema = 'test';
trigger_schema trigger_name event_object_schema event_object_table action_statement
test t1_bi test t4 set @a:=new.id
drop trigger t1_bi;
drop table t4;
create database mysqltest;
use mysqltest;
create table t1 (id int);
create trigger t1_bi before insert on t1 for each row set @a:=new.id;
insert into t1 values (101);
select @a;
@a
101
select trigger_schema, trigger_name, event_object_schema,
event_object_table, action_statement from information_schema.triggers
where event_object_schema = 'test' or event_object_schema = 'mysqltest';
trigger_schema trigger_name event_object_schema event_object_table action_statement
mysqltest t1_bi mysqltest t1 set @a:=new.id
rename table t1 to test.t2;
ERROR HY000: Trigger in wrong schema
insert into t1 values (102);
select @a;
@a
102
select trigger_schema, trigger_name, event_object_schema,
event_object_table, action_statement from information_schema.triggers
where event_object_schema = 'test' or event_object_schema = 'mysqltest';
trigger_schema trigger_name event_object_schema event_object_table action_statement
mysqltest t1_bi mysqltest t1 set @a:=new.id
drop trigger test.t1_bi;
ERROR HY000: Trigger does not exist
drop trigger t1_bi;
drop table t1;
drop database mysqltest;
use test;
create table t1 (id int);
create trigger t1_bi before insert on t1 for each row set @a:=new.id;
create trigger t1_ai after insert on t1 for each row set @b:=new.id;
insert into t1 values (101);
select @a, @b;
@a @b
101 101
select trigger_schema, trigger_name, event_object_schema,
event_object_table, action_statement from information_schema.triggers
where event_object_schema = 'test';
trigger_schema trigger_name event_object_schema event_object_table action_statement
test t1_bi test t1 set @a:=new.id
test t1_ai test t1 set @b:=new.id
rename table t1 to t2;
ERROR HY000: Can't create/write to file './test/t1_ai.TRN~' (Errcode: 13)
insert into t1 values (102);
select @a, @b;
@a @b
102 102
select trigger_schema, trigger_name, event_object_schema,
event_object_table, action_statement from information_schema.triggers
where event_object_schema = 'test';
trigger_schema trigger_name event_object_schema event_object_table action_statement
test t1_bi test t1 set @a:=new.id
test t1_ai test t1 set @b:=new.id
drop trigger t1_bi;
drop trigger t1_ai;
drop table t1;

87
mysql-test/t/trigger.test
View File

@ -3,7 +3,7 @@
#
--disable_warnings
drop table if exists t1, t2, t3;
drop table if exists t1, t2, t3, t4;
drop view if exists v1;
drop database if exists mysqltest;
drop function if exists f1;
@ -961,3 +961,88 @@ create trigger test.t1_bi before insert on t1 for each row set @a:=0;
--error ER_NO_DB_ERROR
drop trigger t1_bi;
connection default;
#
# Test for bug #13525 "Rename table does not keep info of triggers"
#
create table t1 (id int);
create trigger t1_bi before insert on t1 for each row set @a:=new.id;
insert into t1 values (101);
select @a;
select trigger_schema, trigger_name, event_object_schema,
event_object_table, action_statement from information_schema.triggers
where event_object_schema = 'test';
rename table t1 to t2;
# Trigger should work after rename
insert into t2 values (102);
select @a;
select trigger_schema, trigger_name, event_object_schema,
event_object_table, action_statement from information_schema.triggers
where event_object_schema = 'test';
# Let us check that the same works for simple ALTER TABLE ... RENAME
alter table t2 rename to t3;
insert into t3 values (103);
select @a;
select trigger_schema, trigger_name, event_object_schema,
event_object_table, action_statement from information_schema.triggers
where event_object_schema = 'test';
# And for more complex ALTER TABLE
alter table t3 rename to t4, add column val int default 0;
insert into t4 values (104, 1);
select @a;
select trigger_schema, trigger_name, event_object_schema,
event_object_table, action_statement from information_schema.triggers
where event_object_schema = 'test';
# .TRN file should be updated with new table name
drop trigger t1_bi;
drop table t4;
# Rename between different databases if triggers exist should fail
create database mysqltest;
use mysqltest;
create table t1 (id int);
create trigger t1_bi before insert on t1 for each row set @a:=new.id;
insert into t1 values (101);
select @a;
select trigger_schema, trigger_name, event_object_schema,
event_object_table, action_statement from information_schema.triggers
where event_object_schema = 'test' or event_object_schema = 'mysqltest';
--error ER_TRG_IN_WRONG_SCHEMA
rename table t1 to test.t2;
insert into t1 values (102);
select @a;
select trigger_schema, trigger_name, event_object_schema,
event_object_table, action_statement from information_schema.triggers
where event_object_schema = 'test' or event_object_schema = 'mysqltest';
# There should be no fantom .TRN files
--error ER_TRG_DOES_NOT_EXIST
drop trigger test.t1_bi;
drop trigger t1_bi;
drop table t1;
drop database mysqltest;
use test;
# And now let us check that the properly handle rename if there is some
# error during it (that we rollback such renames completely).
create table t1 (id int);
create trigger t1_bi before insert on t1 for each row set @a:=new.id;
create trigger t1_ai after insert on t1 for each row set @b:=new.id;
insert into t1 values (101);
select @a, @b;
select trigger_schema, trigger_name, event_object_schema,
event_object_table, action_statement from information_schema.triggers
where event_object_schema = 'test';
# Trick which makes update of second .TRN file impossible
system echo dummy >var/master-data/test/t1_ai.TRN~;
system chmod 000 var/master-data/test/t1_ai.TRN~;
--error 1
rename table t1 to t2;
# 't1' should be still there and triggers should work correctly
insert into t1 values (102);
select @a, @b;
select trigger_schema, trigger_name, event_object_schema,
event_object_table, action_statement from information_schema.triggers
where event_object_schema = 'test';
system chmod 600 var/master-data/test/t1_ai.TRN;
# Let us check that updates to .TRN files were rolled back too
drop trigger t1_bi;
drop trigger t1_ai;
drop table t1;

23
sql/sql_rename.cc
View File

@ -19,6 +19,7 @@
*/
#include "mysql_priv.h"
#include "sql_trigger.h"
static TABLE_LIST *rename_tables(THD *thd, TABLE_LIST *table_list,
@ -176,8 +177,26 @@ rename_tables(THD *thd, TABLE_LIST *table_list, bool skip_error)
if (table_type == DB_TYPE_UNKNOWN)
my_error(ER_FILE_NOT_FOUND, MYF(0), name, my_errno);
else
rc= mysql_rename_table(table_type, ren_table->db, old_alias,
new_table->db, new_alias);
{
if (!(rc= mysql_rename_table(table_type, ren_table->db, old_alias,
new_table->db, new_alias)))
{
if ((rc= Table_triggers_list::change_table_name(thd, ren_table->db,
old_alias,
new_table->db,
new_alias)))
{
/*
We've succeeded in renaming table's .frm and in updating
corresponding handler data, but have failed to update table's
triggers appropriately. So let us revert operations on .frm
and handler's data and report about failure to rename table.
*/
(void) mysql_rename_table(table_type, new_table->db, new_alias,
ren_table->db, old_alias);
}
}
}
break;
}
case FRMTYPE_VIEW:

13
sql/sql_table.cc
View File

@ -3258,6 +3258,13 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
close_cached_table(thd, table);
if (mysql_rename_table(old_db_type,db,table_name,new_db,new_alias))
error= -1;
else if (Table_triggers_list::change_table_name(thd, db, table_name,
new_db, new_alias))
{
VOID(mysql_rename_table(old_db_type, new_db, new_alias, db,
table_name));
error= -1;
}
}
VOID(pthread_mutex_unlock(&LOCK_open));
}
@ -3806,7 +3813,11 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
VOID(quick_rm_table(new_db_type,new_db,tmp_name));
}
else if (mysql_rename_table(new_db_type,new_db,tmp_name,new_db,
new_alias))
new_alias) ||
(new_name != table_name || new_db != db) && // we also do rename
Table_triggers_list::change_table_name(thd, db, table_name,
new_db, new_alias))
{ // Try to get everything back
error=1;
VOID(quick_rm_table(new_db_type,new_db,new_alias));

290
sql/sql_trigger.cc
View File

@ -58,7 +58,6 @@ static File_option triggers_file_parameters[]=
*/
static const int TRG_NUM_REQUIRED_PARAMETERS= 4;
static const int TRG_MAX_VERSIONS= 3;
/*
Structure representing contents of .TRN file which are used to support
@ -455,8 +454,7 @@ bool Table_triggers_list::create_trigger(THD *thd, TABLE_LIST *tables,
definer_host->str, NullS) - trg_definer->str;
if (!sql_create_definition_file(&dir, &file, &triggers_file_type,
(gptr)this, triggers_file_parameters,
TRG_MAX_VERSIONS))
(gptr)this, triggers_file_parameters, 0))
return 0;
err_with_cleanup:
@ -480,7 +478,8 @@ err_with_cleanup:
True - error
*/
static bool rm_trigger_file(char *path, char *db, char *table_name)
static bool rm_trigger_file(char *path, const char *db,
const char *table_name)
{
strxnmov(path, FN_REFLEN, mysql_data_home, "/", db, "/", table_name,
triggers_file_ext, NullS);
@ -504,7 +503,8 @@ static bool rm_trigger_file(char *path, char *db, char *table_name)
True - error
*/
static bool rm_trigname_file(char *path, char *db, char *trigger_name)
static bool rm_trigname_file(char *path, const char *db,
const char *trigger_name)
{
strxnmov(path, FN_REFLEN, mysql_data_home, "/", db, "/", trigger_name,
trigname_file_ext, NullS);
@ -513,6 +513,38 @@ static bool rm_trigname_file(char *path, char *db, char *trigger_name)
}
/*
Helper function that saves .TRG file for Table_triggers_list object.
SYNOPSIS
save_trigger_file()
triggers Table_triggers_list object for which file should be saved
db Name of database for subject table
table_name Name of subject table
RETURN VALUE
FALSE Success
TRUE Error
*/
static bool save_trigger_file(Table_triggers_list *triggers, const char *db,
const char *table_name)
{
char dir_buff[FN_REFLEN], file_buff[FN_REFLEN];
LEX_STRING dir, file;
strxnmov(dir_buff, FN_REFLEN, mysql_data_home, "/", db, "/", NullS);
dir.length= unpack_filename(dir_buff, dir_buff);
dir.str= dir_buff;
file.length= strxnmov(file_buff, FN_REFLEN, table_name, triggers_file_ext,
NullS) - file_buff;
file.str= file_buff;
return sql_create_definition_file(&dir, &file, &triggers_file_type,
(gptr)triggers, triggers_file_parameters, 0);
}
/*
Drop trigger for table.
@ -566,20 +598,7 @@ bool Table_triggers_list::drop_trigger(THD *thd, TABLE_LIST *tables)
}
else
{
char dir_buff[FN_REFLEN], file_buff[FN_REFLEN];
LEX_STRING dir, file;
strxnmov(dir_buff, FN_REFLEN, mysql_data_home, "/", tables->db,
"/", NullS);
dir.length= unpack_filename(dir_buff, dir_buff);
dir.str= dir_buff;
file.length= strxnmov(file_buff, FN_REFLEN, tables->table_name,
triggers_file_ext, NullS) - file_buff;
file.str= file_buff;
if (sql_create_definition_file(&dir, &file, &triggers_file_type,
(gptr)this, triggers_file_parameters,
TRG_MAX_VERSIONS))
if (save_trigger_file(this, tables->db, tables->table_name))
return 1;
}
@ -819,13 +838,13 @@ bool Table_triggers_list::check_n_load(THD *thd, const char *db,
if (!names_only && triggers->prepare_record1_accessors(table))
DBUG_RETURN(1);
char *trg_name_buff;
List_iterator_fast<ulonglong> itm(triggers->definition_modes_list);
List_iterator_fast<LEX_STRING> it_definer(triggers->
definers_list);
LEX *old_lex= thd->lex, lex;
sp_rcontext *save_spcont= thd->spcont;
ulong save_sql_mode= thd->variables.sql_mode;
LEX_STRING *on_table_name;
thd->lex= &lex;
@ -890,6 +909,21 @@ bool Table_triggers_list::check_n_load(THD *thd, const char *db,
&table->mem_root))
goto err_with_lex_cleanup;
if (!(on_table_name= (LEX_STRING*) alloc_root(&table->mem_root,
sizeof(LEX_STRING))))
goto err_with_lex_cleanup;
*on_table_name= lex.ident;
if (triggers->on_table_names_list.push_back(on_table_name, &table->mem_root))
goto err_with_lex_cleanup;
/*
Let us check that we correctly update trigger definitions when we
rename tables with triggers.
*/
DBUG_ASSERT(!my_strcasecmp(table_alias_charset, lex.query_tables->db, db) &&
!my_strcasecmp(table_alias_charset, lex.query_tables->table_name,
table_name));
if (names_only)
{
lex_end(&lex);
@ -1055,7 +1089,7 @@ static TABLE_LIST *add_table_for_trigger(THD *thd, sp_name *trig)
lex->query_tables= 0;
lex->query_tables_last= &lex->query_tables;
DBUG_RETURN(sp_add_to_query_tables(thd, lex, trig->m_db.str,
trigname.trigger_table.str, TL_WRITE));
trigname.trigger_table.str, TL_IGNORE));
}
@ -1125,6 +1159,220 @@ end:
}
/*
Update .TRG file after renaming triggers' subject table
(change name of table in triggers' definitions).
SYNOPSIS
change_table_name_in_triggers()
thd Thread context
db_name Database of subject table
old_table_name Old subject table's name
new_table_name New subject table's name
RETURN VALUE
FALSE Success
TRUE Failure
*/
bool
Table_triggers_list::change_table_name_in_triggers(THD *thd,
const char *db_name,
LEX_STRING *old_table_name,
LEX_STRING *new_table_name)
{
char path_buff[FN_REFLEN];
LEX_STRING *def, *on_table_name, new_def;
ulonglong *sql_mode;
ulong save_sql_mode= thd->variables.sql_mode;
List_iterator_fast<LEX_STRING> it_def(definitions_list);
List_iterator_fast<LEX_STRING> it_on_table_name(on_table_names_list);
List_iterator_fast<ulonglong> it_mode(definition_modes_list);
uint on_q_table_name_len, before_on_len;
String buff;
DBUG_ASSERT(definitions_list.elements == on_table_names_list.elements &&
definitions_list.elements == definition_modes_list.elements);
while ((def= it_def++))
{
on_table_name= it_on_table_name++;
thd->variables.sql_mode= *(it_mode++);
/* Construct CREATE TRIGGER statement with new table name. */
buff.length(0);
before_on_len= on_table_name->str - def->str;
buff.append(def->str, before_on_len);
buff.append(STRING_WITH_LEN("ON "));
append_identifier(thd, &buff, new_table_name->str, new_table_name->length);
on_q_table_name_len= buff.length() - before_on_len;
buff.append(on_table_name->str + on_table_name->length,
def->length - (before_on_len + on_table_name->length));
/*
It is OK to allocate some memory on table's MEM_ROOT since this
table instance will be thrown out at the end of rename anyway.
*/
new_def.str= memdup_root(&table->mem_root, buff.ptr(), buff.length());
new_def.length= buff.length();
on_table_name->str= new_def.str + before_on_len;
on_table_name->length= on_q_table_name_len;
*def= new_def;
}
thd->variables.sql_mode= save_sql_mode;
if (thd->is_fatal_error)
return TRUE; /* OOM */
if (save_trigger_file(this, db_name, new_table_name->str))
return TRUE;
if (rm_trigger_file(path_buff, db_name, old_table_name->str))
{
(void) rm_trigger_file(path_buff, db_name, new_table_name->str);
return TRUE;
}
return FALSE;
}
/*
Iterate though Table_triggers_list::names_list list and update .TRN files
after renaming triggers' subject table.
SYNOPSIS
change_table_name_in_trignames()
db_name Database of subject table
new_table_name New subject table's name
stopper Pointer to Table_triggers_list::names_list at
which we should stop updating.
RETURN VALUE
0 Success
non-0 Failure, pointer to Table_triggers_list::names_list element
for which update failed.
*/
LEX_STRING*
Table_triggers_list::change_table_name_in_trignames(const char *db_name,
LEX_STRING *new_table_name,
LEX_STRING *stopper)
{
char dir_buff[FN_REFLEN], trigname_buff[FN_REFLEN];
struct st_trigname trigname;
LEX_STRING dir, trigname_file;
LEX_STRING *trigger;
List_iterator_fast<LEX_STRING> it_name(names_list);
strxnmov(dir_buff, FN_REFLEN, mysql_data_home, "/", db_name, "/", NullS);
dir.length= unpack_filename(dir_buff, dir_buff);
dir.str= dir_buff;
while ((trigger= it_name++) != stopper)
{
trigname_file.length= strxnmov(trigname_buff, FN_REFLEN, trigger->str,
trigname_file_ext, NullS) - trigname_buff;
trigname_file.str= trigname_buff;
trigname.trigger_table= *new_table_name;
if (sql_create_definition_file(&dir, &trigname_file, &trigname_file_type,
(gptr)&trigname, trigname_file_parameters, 0))
return trigger;
}
return 0;
}
/*
Update .TRG and .TRN files after renaming triggers' subject table.
SYNOPSIS
change_table_name()
thd Thread context
db Old database of subject table
old_table Old name of subject table
new_db New database for subject table
new_table New name of subject table
NOTE
This method tries to leave trigger related files in consistent state,
i.e. it either will complete successfully, or will fail leaving files
in their initial state.
RETURN VALUE
FALSE Success
TRUE Error
*/
bool Table_triggers_list::change_table_name(THD *thd, const char *db,
const char *old_table,
const char *new_db,
const char *new_table)
{
TABLE table;
bool result= 0;
LEX_STRING *err_trigname;
DBUG_ENTER("change_table_name");
bzero(&table, sizeof(table));
init_alloc_root(&table.mem_root, 8192, 0);
safe_mutex_assert_owner(&LOCK_open);
if (Table_triggers_list::check_n_load(thd, db, old_table, &table, TRUE))
{
result= 1;
goto end;
}
if (table.triggers)
{
LEX_STRING_WITH_INIT old_table_name(old_table, strlen(old_table));
LEX_STRING_WITH_INIT new_table_name(new_table, strlen(new_table));
/*
Since triggers should be in the same schema as their subject tables
moving table with them between two schemas raises too many questions.
(E.g. what should happen if in new schema we already have trigger
with same name ?).
*/
if (my_strcasecmp(table_alias_charset, db, new_db))
{
my_error(ER_TRG_IN_WRONG_SCHEMA, MYF(0));
result= 1;
goto end;
}
if (table.triggers->change_table_name_in_triggers(thd, db,
&old_table_name,
&new_table_name))
{
result= 1;
goto end;
}
if ((err_trigname= table.triggers->change_table_name_in_trignames(
db, &new_table_name, 0)))
{
/*
If we were unable to update one of .TRN files properly we will
revert all changes that we have done and report about error.
We assume that we will be able to undo our changes without errors
(we can't do much if there will be an error anyway).
*/
(void) table.triggers->change_table_name_in_trignames(db,
&old_table_name,
err_trigname);
(void) table.triggers->change_table_name_in_triggers(thd, db,
&new_table_name,
&old_table_name);
result= 1;
goto end;
}
}
end:
delete table.triggers;
free_root(&table.mem_root, MYF(0));
DBUG_RETURN(result);
}
bool Table_triggers_list::process_triggers(THD *thd, trg_event_type event,
trg_action_time_type time_type,

17
sql/sql_trigger.h
View File

@ -46,6 +46,11 @@ class Table_triggers_list: public Sql_alloc
used in CREATE/DROP TRIGGER for looking up trigger by name.
*/
List<LEX_STRING> names_list;
/*
List of "ON table_name" parts in trigger definitions, used for
updating trigger definitions during RENAME TABLE.
*/
List<LEX_STRING> on_table_names_list;
/*
Key representing triggers for this table in set of all stored
routines used by statement.
@ -97,7 +102,10 @@ public:
static bool check_n_load(THD *thd, const char *db, const char *table_name,
TABLE *table, bool names_only);
static bool drop_all_triggers(THD *thd, char *db, char *table_name);
static bool change_table_name(THD *thd, const char *db,
const char *old_table,
const char *new_db,
const char *new_table);
bool has_delete_triggers()
{
return (bodies[TRG_EVENT_DELETE][TRG_ACTION_BEFORE] ||
@ -122,6 +130,13 @@ public:
private:
bool prepare_record1_accessors(TABLE *table);
LEX_STRING* change_table_name_in_trignames(const char *db_name,
LEX_STRING *new_table_name,
LEX_STRING *stopper);
bool change_table_name_in_triggers(THD *thd,
const char *db_name,
LEX_STRING *old_table_name,
LEX_STRING *new_table_name);
};
extern const LEX_STRING trg_action_time_type_names[];

16
sql/sql_yacc.yy
View File

@ -9070,8 +9070,8 @@ view_check_option:
**************************************************************************/
trigger_tail:
TRIGGER_SYM remember_name sp_name trg_action_time trg_event
ON table_ident FOR_SYM EACH_SYM ROW_SYM
TRIGGER_SYM remember_name sp_name trg_action_time trg_event
ON remember_name table_ident remember_end FOR_SYM EACH_SYM ROW_SYM
{
LEX *lex= Lex;
sp_head *sp;
@ -9088,7 +9088,9 @@ trigger_tail:
sp->init(lex);
lex->trigger_definition_begin= $2;
lex->ident.str= $7;
lex->ident.length= $9 - $7;
sp->m_type= TYPE_ENUM_TRIGGER;
lex->sphead= sp;
lex->spname= $3;
@ -9123,15 +9125,11 @@ trigger_tail:
We have to do it after parsing trigger body, because some of
sp_proc_stmt alternatives are not saving/restoring LEX, so
lex->query_tables can be wiped out.
QQ: What are other consequences of this?
QQ: Could we loosen lock type in certain cases ?
*/
if (!lex->select_lex.add_table_to_list(YYTHD, $7,
if (!lex->select_lex.add_table_to_list(YYTHD, $8,
(LEX_STRING*) 0,
TL_OPTION_UPDATING,
TL_WRITE))
TL_IGNORE))
YYABORT;
}
;