Fix for bugs #5892/6182/8751/8758/10994 (based on Antony's patch)

"Triggers have the wrong namespace"
  "Triggers: duplicate names allowed"
  "Triggers: CREATE TRIGGER does not accept fully qualified names"
  "SHOW TRIGGERS"

mysql-test/r/information_schema.result

@@ -48,6 +48,7 @@ TABLE_PRIVILEGES
 COLUMN_PRIVILEGES
 TABLE_CONSTRAINTS
 KEY_COLUMN_USAGE
+TRIGGERS
 columns_priv
 db
 func
@@ -77,6 +78,7 @@ c	table_name
 TABLES	TABLES
 TABLE_PRIVILEGES	TABLE_PRIVILEGES
 TABLE_CONSTRAINTS	TABLE_CONSTRAINTS
+TRIGGERS	TRIGGERS
 tables_priv	tables_priv
 time_zone	time_zone
 time_zone_leap_second	time_zone_leap_second
@@ -94,6 +96,7 @@ c	table_name
 TABLES	TABLES
 TABLE_PRIVILEGES	TABLE_PRIVILEGES
 TABLE_CONSTRAINTS	TABLE_CONSTRAINTS
+TRIGGERS	TRIGGERS
 tables_priv	tables_priv
 time_zone	time_zone
 time_zone_leap_second	time_zone_leap_second
@@ -111,6 +114,7 @@ c	table_name
 TABLES	TABLES
 TABLE_PRIVILEGES	TABLE_PRIVILEGES
 TABLE_CONSTRAINTS	TABLE_CONSTRAINTS
+TRIGGERS	TRIGGERS
 tables_priv	tables_priv
 time_zone	time_zone
 time_zone_leap_second	time_zone_leap_second
@@ -577,6 +581,7 @@ Tables_in_information_schema (T%)
 TABLES
 TABLE_PRIVILEGES
 TABLE_CONSTRAINTS
+TRIGGERS
 create database information_schema;
 ERROR HY000: Can't create database 'information_schema'; database exists
 use information_schema;
@@ -585,6 +590,7 @@ Tables_in_information_schema (T%)	Table_type
 TABLES	TEMPORARY
 TABLE_PRIVILEGES	TEMPORARY
 TABLE_CONSTRAINTS	TEMPORARY
+TRIGGERS	TEMPORARY
 create table t1(a int);
 ERROR 42S02: Unknown table 't1' in information_schema
 use test;
@@ -596,6 +602,7 @@ Tables_in_information_schema (T%)
 TABLES
 TABLE_PRIVILEGES
 TABLE_CONSTRAINTS
+TRIGGERS
 select table_name from tables where table_name='user';
 table_name
 user
@@ -690,7 +697,7 @@ CREATE TABLE t_crashme ( f1 BIGINT);
 CREATE VIEW a1 (t_CRASHME) AS SELECT f1 FROM t_crashme GROUP BY f1;
 CREATE VIEW a2 AS SELECT t_CRASHME FROM a1;
 count(*)
-100
+101
 drop view a2, a1;
 drop table t_crashme;
 select table_schema,table_name, column_name from
@@ -701,6 +708,8 @@ information_schema	COLUMNS	COLUMN_TYPE
 information_schema	ROUTINES	ROUTINE_DEFINITION
 information_schema	ROUTINES	SQL_MODE
 information_schema	VIEWS	VIEW_DEFINITION
+information_schema	TRIGGERS	ACTION_CONDITION
+information_schema	TRIGGERS	ACTION_STATEMENT
 select table_name, column_name, data_type from information_schema.columns
 where data_type = 'datetime';
 table_name	column_name	data_type
@@ -709,6 +718,7 @@ TABLES	UPDATE_TIME	datetime
 TABLES	CHECK_TIME	datetime
 ROUTINES	CREATED	datetime
 ROUTINES	LAST_ALTERED	datetime
+TRIGGERS	CREATED	datetime
 SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES A
 WHERE NOT EXISTS 
 (SELECT * FROM INFORMATION_SCHEMA.COLUMNS B
@@ -755,8 +765,71 @@ delete from mysql.db where user='mysqltest_4';
 flush privileges;
 SELECT table_schema, count(*) FROM information_schema.TABLES GROUP BY TABLE_SCHEMA;
 table_schema	count(*)
-information_schema	15
+information_schema	16
 mysql	17
+create table t1 (i int, j int);
+create trigger trg1 before insert on t1 for each row
+begin
+if new.j > 10 then
+set new.j := 10;
+end if;
+end|
+create trigger trg2 before update on t1 for each row
+begin
+if old.i % 2 = 0 then
+set new.j := -1;
+end if;
+end|
+create trigger trg3 after update on t1 for each row
+begin
+if new.j = -1 then
+set @fired:= "Yes";
+end if;
+end|
+show triggers;
+Trigger	Event	Table	Statement	Timing	Created
+trg1	INSERT	t1	
+begin
+if new.j > 10 then
+set new.j := 10;
+end if;
+end	BEFORE	NULL
+trg2	UPDATE	t1	
+begin
+if old.i % 2 = 0 then
+set new.j := -1;
+end if;
+end	BEFORE	NULL
+trg3	UPDATE	t1	
+begin
+if new.j = -1 then
+set @fired:= "Yes";
+end if;
+end	AFTER	NULL
+select * from information_schema.triggers;
+TRIGGER_CATALOG	TRIGGER_SCHEMA	TRIGGER_NAME	EVENT_MANIPULATION	EVENT_OBJECT_CATALOG	EVENT_OBJECT_SCHEMA	EVENT_OBJECT_TABLE	ACTION_ORDER	ACTION_CONDITION	ACTION_STATEMENT	ACTION_ORIENTATION	ACTION_TIMING	ACTION_REFERENCE_OLD_TABLE	ACTION_REFERENCE_NEW_TABLE	ACTION_REFERENCE_OLD_ROW	ACTION_REFERENCE_NEW_ROW	CREATED
+NULL	test	trg1	INSERT	NULL	test	t1	0	NULL	
+begin
+if new.j > 10 then
+set new.j := 10;
+end if;
+end	ROW	BEFORE	NULL	NULL	OLD	NEW	NULL
+NULL	test	trg2	UPDATE	NULL	test	t1	0	NULL	
+begin
+if old.i % 2 = 0 then
+set new.j := -1;
+end if;
+end	ROW	BEFORE	NULL	NULL	OLD	NEW	NULL
+NULL	test	trg3	UPDATE	NULL	test	t1	0	NULL	
+begin
+if new.j = -1 then
+set @fired:= "Yes";
+end if;
+end	ROW	AFTER	NULL	NULL	OLD	NEW	NULL
+drop trigger trg1;
+drop trigger trg2;
+drop trigger trg3;
+drop table t1;
 create database mysqltest;
 create table mysqltest.t1 (f1 int, f2 int);
 create table mysqltest.t2 (f1 int);

mysql-test/r/information_schema_db.result

@@ -16,11 +16,13 @@ TABLE_PRIVILEGES
 COLUMN_PRIVILEGES
 TABLE_CONSTRAINTS
 KEY_COLUMN_USAGE
+TRIGGERS
 show tables from INFORMATION_SCHEMA like 'T%';
 Tables_in_information_schema (T%)
 TABLES
 TABLE_PRIVILEGES
 TABLE_CONSTRAINTS
+TRIGGERS
 create database `inf%`;
 use `inf%`;
 show tables;

mysql-test/r/rpl_sp.result

@@ -237,7 +237,7 @@ select * from t1;
 a
 10
 delete from t1;
-drop trigger t1.trg;
+drop trigger trg;
 insert into t1 values (1);
 select * from t1;
 a
@@ -248,7 +248,7 @@ master-bin.000002	#	Query	1	#	use `mysqltest1`; delete from t1
 master-bin.000002	#	Query	1	#	use `mysqltest1`; create trigger trg before insert on t1 for each row set new.a= 10
 master-bin.000002	#	Query	1	#	use `mysqltest1`; insert into t1 values (1)
 master-bin.000002	#	Query	1	#	use `mysqltest1`; delete from t1
-master-bin.000002	#	Query	1	#	use `mysqltest1`; drop trigger t1.trg
+master-bin.000002	#	Query	1	#	use `mysqltest1`; drop trigger trg
 master-bin.000002	#	Query	1	#	use `mysqltest1`; insert into t1 values (1)
 select * from t1;
 a

mysql-test/r/trigger.result

@@ -12,13 +12,13 @@ insert into t1 values (1);
 select @a;
 @a
 1
-drop trigger t1.trg;
+drop trigger trg;
 create trigger trg before insert on t1 for each row set @a:=new.i;
 insert into t1 values (123);
 select @a;
 @a
 123
-drop trigger t1.trg;
+drop trigger trg;
 drop table t1;
 create table t1 (i int not null, j int);
 create trigger trg before insert on t1 for each row 
@@ -33,7 +33,7 @@ select * from t1|
 i	j
 1	10
 2	3
-drop trigger t1.trg|
+drop trigger trg|
 drop table t1|
 create table t1 (i int not null primary key);
 create trigger trg after insert on t1 for each row 
@@ -43,7 +43,7 @@ insert into t1 values (2),(3),(4),(5);
 select @a;
 @a
 2:3:4:5
-drop trigger t1.trg;
+drop trigger trg;
 drop table t1;
 create table t1 (aid int not null primary key, balance int not null default 0);
 insert into t1 values (1, 1000), (2,3000);
@@ -65,7 +65,7 @@ Too big change for aid = 2
 aid	balance
 1	1500
 2	3000
-drop trigger t1.trg|
+drop trigger trg|
 drop table t1|
 create table t1 (i int);
 insert into t1 values (1),(2),(3),(4);
@@ -76,7 +76,7 @@ update t1 set i=3;
 select @total_change;
 @total_change
 2
-drop trigger t1.trg;
+drop trigger trg;
 drop table t1;
 create table t1 (i int);
 insert into t1 values (1),(2),(3),(4);
@@ -87,7 +87,7 @@ delete from t1 where i <= 3;
 select @del_sum;
 @del_sum
 6
-drop trigger t1.trg;
+drop trigger trg;
 drop table t1;
 create table t1 (i int);
 insert into t1 values (1),(2),(3),(4);
@@ -97,7 +97,7 @@ delete from t1 where i <> 0;
 select @del;
 @del
 1
-drop trigger t1.trg;
+drop trigger trg;
 drop table t1;
 create table t1 (i int, j int);
 create trigger trg1 before insert on t1 for each row 
@@ -137,9 +137,9 @@ i	j
 1	20
 2	-1
 3	20
-drop trigger t1.trg1;
+drop trigger trg1;
-drop trigger t1.trg2;
+drop trigger trg2;
-drop trigger t1.trg3;
+drop trigger trg3;
 drop table t1;
 create table t1 (id int not null primary key, data int);
 create trigger t1_bi before insert on t1 for each row
@@ -197,7 +197,7 @@ select * from t2;
 event
 INSERT INTO t1 id=1 data='one'
 INSERT INTO t1 id=2 data='two'
-drop trigger t1.t1_ai;
+drop trigger t1_ai;
 create trigger t1_bi before insert on t1 for each row
 begin
 if exists (select id from t3 where id=new.fk) then
@@ -271,6 +271,7 @@ id	copy
 3	NULL
 drop table t1, t2;
 create table t1 (i int);
+create table t3 (i int);
 create trigger trg before insert on t1 for each row set @a:= old.i;
 ERROR HY000: There is no OLD row in on INSERT trigger
 create trigger trg before delete on t1 for each row set @a:= new.i;
@@ -292,14 +293,19 @@ create trigger trg after insert on t1 for each row set @a:=1;
 ERROR HY000: Trigger already exists
 create trigger trg2 before insert on t1 for each row set @a:=1;
 ERROR HY000: Trigger already exists
-drop trigger t1.trg;
+create trigger trg before insert on t3 for each row set @a:=1;
-drop trigger t1.trg;
+ERROR HY000: Trigger already exists
+create trigger trg2 before insert on t3 for each row set @a:=1;
+drop trigger trg2;
+drop trigger trg;
+drop trigger trg;
 ERROR HY000: Trigger does not exist
 create view v1 as select * from t1;
 create trigger trg before insert on v1 for each row set @a:=1;
 ERROR HY000: 'test.v1' is not BASE TABLE
 drop view v1;
 drop table t1;
+drop table t3;
 create temporary table t1 (i int);
 create trigger trg before insert on t1 for each row set @a:=1;
 ERROR HY000: Trigger's 't1' is view or temporary table
@@ -307,7 +313,7 @@ drop table t1;
 create table t1 (x1col char);
 create trigger tx1 before insert on t1 for each row set new.x1col = 'x';
 insert into t1 values ('y');
-drop trigger t1.tx1;
+drop trigger tx1;
 drop table t1;
 create table t1 (i int) engine=myisam;
 insert into t1 values (1), (2);
@@ -318,8 +324,8 @@ delete from t1;
 select @del_before, @del_after;
 @del_before	@del_after
 3	3
-drop trigger t1.trg1;
+drop trigger trg1;
-drop trigger t1.trg2;
+drop trigger trg2;
 drop table t1;
 create table t1 (a int);
 create trigger trg1 before insert on t1 for each row set new.a= 10;
@@ -336,6 +342,15 @@ create table t1 (i int);
 create trigger trg1 before insert on t1 for each row set @a:= 1;
 drop database mysqltest;
 use test;
+create database mysqltest;
+create table mysqltest.t1 (i int);
+create trigger trg1 before insert on mysqltest.t1 for each row set @a:= 1;
+ERROR HY000: Trigger in wrong schema
+use mysqltest;
+create trigger test.trg1 before insert on t1 for each row set @a:= 1;
+ERROR HY000: Trigger in wrong schema
+drop database mysqltest;
+use test;
 create table t1 (i int, j int default 10, k int not null, key (k));
 create table t2 (i int);
 insert into t1 (i, k) values (1, 1);
@@ -549,7 +564,7 @@ i	k
 1	1
 2	2
 alter table t1 add primary key (i);
-drop trigger t1.bi;
+drop trigger bi;
 insert into t1 values (2, 4) on duplicate key update k= k + 10;
 ERROR 42S22: Unknown column 'bt' in 'NEW'
 select * from t1;
@@ -578,5 +593,5 @@ create trigger t1_bu before update on t1 for each row set new.col1= bug5893();
 drop function bug5893;
 update t1 set col2 = 4;
 ERROR 42000: FUNCTION test.bug5893 does not exist
-drop trigger t1.t1_bu;
+drop trigger t1_bu;
 drop table t1;

mysql-test/r/view.result

@@ -1245,7 +1245,7 @@ select * from v1;
 s1
 select * from t1;
 s1
-drop trigger t1.t1_bi;
+drop trigger t1_bi;
 drop view v1;
 drop table t1;
 create table t1 (s1 tinyint);

mysql-test/t/information_schema.test

@@ -505,6 +505,41 @@ flush privileges;
 #
 SELECT table_schema, count(*) FROM information_schema.TABLES GROUP BY TABLE_SCHEMA;
 
+
+#
+# TRIGGERS table test
+#
+create table t1 (i int, j int);
+
+delimiter |;
+create trigger trg1 before insert on t1 for each row
+begin
+  if new.j > 10 then
+    set new.j := 10;
+  end if;
+end|
+create trigger trg2 before update on t1 for each row
+begin
+  if old.i % 2 = 0 then
+    set new.j := -1;
+  end if;
+end|
+create trigger trg3 after update on t1 for each row
+begin
+  if new.j = -1 then
+    set @fired:= "Yes";
+  end if;
+end|
+delimiter ;|
+show triggers;
+select * from information_schema.triggers;
+
+drop trigger trg1;
+drop trigger trg2;
+drop trigger trg3;
+drop table t1;
+
+
 #
 # Bug #10964  Information Schema:Authorization check on privilege tables is improper
 #

mysql-test/t/rpl_sp.test

@@ -249,7 +249,7 @@ select * from t1;
 
 connection master;
 delete from t1;
-drop trigger t1.trg;
+drop trigger trg;
 insert into t1 values (1);
 select * from t1;
 --replace_column 2 # 5 #

mysql-test/t/trigger.test

@@ -17,13 +17,13 @@ set @a:=0;
 select @a;
 insert into t1 values (1);
 select @a;
-drop trigger t1.trg;
+drop trigger trg;
 
 # let us test simple trigger reading some values 
 create trigger trg before insert on t1 for each row set @a:=new.i;
 insert into t1 values (123);
 select @a;
-drop trigger t1.trg;
+drop trigger trg;
 
 drop table t1;
 
@@ -40,7 +40,7 @@ end|
 insert into t1 (i) values (1)|
 insert into t1 (i,j) values (2, 3)|
 select * from t1|
-drop trigger t1.trg|
+drop trigger trg|
 drop table t1|
 delimiter ;|
 
@@ -52,7 +52,7 @@ create trigger trg after insert on t1 for each row
 set @a:="";
 insert into t1 values (2),(3),(4),(5);
 select @a;
-drop trigger t1.trg;
+drop trigger trg;
 drop table t1;
 
 # PS doesn't work with multi-row statements
@@ -75,7 +75,7 @@ set @update_failed:=""|
 update t1 set balance=1500|
 select @update_failed;
 select * from t1|
-drop trigger t1.trg|
+drop trigger trg|
 drop table t1|
 delimiter ;|
 --enable_ps_protocol
@@ -88,7 +88,7 @@ create trigger trg after update on t1 for each row
 set @total_change:=0;
 update t1 set i=3;
 select @total_change;
-drop trigger t1.trg;
+drop trigger trg;
 drop table t1;
 
 # Before delete trigger
@@ -100,7 +100,7 @@ create trigger trg before delete on t1 for each row
 set @del_sum:= 0;
 delete from t1 where i <= 3;
 select @del_sum;
-drop trigger t1.trg;
+drop trigger trg;
 drop table t1;
 
 # After delete trigger. 
@@ -111,7 +111,7 @@ create trigger trg after delete on t1 for each row set @del:= 1;
 set @del:= 0;
 delete from t1 where i <> 0;
 select @del;
-drop trigger t1.trg;
+drop trigger trg;
 drop table t1;
 
 # Several triggers on one table
@@ -145,9 +145,9 @@ update t1 set j= 20;
 select @fired;
 select * from t1;
 
-drop trigger t1.trg1;
+drop trigger trg1;
-drop trigger t1.trg2;
+drop trigger trg2;
-drop trigger t1.trg3;
+drop trigger trg3;
 drop table t1;
 
 
@@ -212,7 +212,7 @@ create trigger t1_ai after insert on t1 for each row
 insert into t1 (id, data) values (1, "one"), (2, "two");
 select * from t1;
 select * from t2;
-drop trigger t1.t1_ai;
+drop trigger t1_ai;
 # Trigger which uses couple of tables (and partially emulates FK constraint)
 delimiter |;
 create trigger t1_bi before insert on t1 for each row
@@ -282,6 +282,7 @@ drop table t1, t2;
 # Test of wrong column specifiers in triggers
 #
 create table t1 (i int);
+create table t3 (i int);
 
 --error 1363
 create trigger trg before insert on t1 for each row set @a:= old.i;
@@ -301,7 +302,7 @@ create trigger trg before update on t1 for each row set @a:=old.j;
 
 #
 # Let us test various trigger creation errors
-#
+# Also quickly test table namespace (bug#5892/6182)
 #
 --error 1146
 create trigger trg before insert on t2 for each row set @a:=1;
@@ -311,10 +312,14 @@ create trigger trg before insert on t1 for each row set @a:=1;
 create trigger trg after insert on t1 for each row set @a:=1;
 --error 1359
 create trigger trg2 before insert on t1 for each row set @a:=1;
-drop trigger t1.trg;
+--error 1359
+create trigger trg before insert on t3 for each row set @a:=1;
+create trigger trg2 before insert on t3 for each row set @a:=1;
+drop trigger trg2;
+drop trigger trg;
 
 --error 1360
-drop trigger t1.trg;
+drop trigger trg;
 
 create view v1 as select * from t1;
 --error 1347
@@ -322,6 +327,7 @@ create trigger trg before insert on v1 for each row set @a:=1;
 drop view v1;
 
 drop table t1;
+drop table t3;
 
 create temporary table t1 (i int);
 --error 1361
@@ -339,7 +345,7 @@ drop table t1;
 create table t1 (x1col char);  
 create trigger tx1 before insert on t1 for each row set new.x1col = 'x';
 insert into t1 values ('y');
-drop trigger t1.tx1;
+drop trigger tx1;
 drop table t1;
 
 #
@@ -355,8 +361,8 @@ create trigger trg2 after delete on t1 for each row set @del_after:= @del_after
 set @del_before:=0, @del_after:= 0;
 delete from t1;
 select @del_before, @del_after;
-drop trigger t1.trg1;
+drop trigger trg1;
-drop trigger t1.trg2;
+drop trigger trg2;
 drop table t1;
 
 # Test for bug #5859 "DROP TABLE does not drop triggers". Trigger should not
@@ -378,6 +384,19 @@ create trigger trg1 before insert on t1 for each row set @a:= 1;
 drop database mysqltest;
 use test;
 
+# Test for bug #8791
+# "Triggers: Allowed to create triggers on a subject table in a different DB". 
+create database mysqltest;
+create table mysqltest.t1 (i int);
+--error 1429
+create trigger trg1 before insert on mysqltest.t1 for each row set @a:= 1;
+use mysqltest;
+--error 1429
+create trigger test.trg1 before insert on t1 for each row set @a:= 1;
+drop database mysqltest;
+use test;
+
+
 # Test for bug #5860 "Multi-table UPDATE does not activate update triggers"
 # We will also test how delete triggers wor for multi-table DELETE.
 create table t1 (i int, j int default 10, k int not null, key (k));
@@ -559,7 +578,7 @@ select * from t1;
 # To test properly code-paths different from those that are used
 # in ordinary INSERT we need to drop "before insert" trigger.
 alter table t1 add primary key (i);
-drop trigger t1.bi;
+drop trigger bi;
 --error 1054
 insert into t1 values (2, 4) on duplicate key update k= k + 10;
 select * from t1;
@@ -589,5 +608,5 @@ drop function bug5893;
 --error 1305
 update t1 set col2 = 4;
 # This should not crash server too.
-drop trigger t1.t1_bu;
+drop trigger t1_bu;
 drop table t1;

mysql-test/t/view.test

@@ -1182,7 +1182,7 @@ create view v1 as select * from t1 where s1 <> 127 with check option;
 insert into v1 values (0);
 select * from v1;
 select * from t1;
-drop trigger t1.t1_bi;
+drop trigger t1_bi;
 drop view v1;
 drop table t1;
 

sql/handler.cc

@@ -2434,6 +2434,7 @@ TYPELIB *ha_known_exts(void)
 
     known_extensions_id= mysys_usage_id;
     found_exts.push_back((char*) triggers_file_ext);
+    found_exts.push_back((char*) trigname_file_ext);
     for (types= sys_table_types; types->type; types++)
     {
       if (*types->value == SHOW_OPTION_YES)

sql/item.h

@@ -1781,7 +1781,7 @@ public:
 */
 enum trg_action_time_type
 {
-  TRG_ACTION_BEFORE= 0, TRG_ACTION_AFTER= 1
+  TRG_ACTION_BEFORE= 0, TRG_ACTION_AFTER= 1, TRG_ACTION_MAX
 };
 
 /*
@@ -1789,7 +1789,7 @@ enum trg_action_time_type
 */
 enum trg_event_type
 {
-  TRG_EVENT_INSERT= 0 , TRG_EVENT_UPDATE= 1, TRG_EVENT_DELETE= 2
+  TRG_EVENT_INSERT= 0 , TRG_EVENT_UPDATE= 1, TRG_EVENT_DELETE= 2, TRG_EVENT_MAX
 };
 
 class Table_triggers_list;

sql/lex.h

@@ -497,6 +497,7 @@ static SYMBOL symbols[] = {
   { "TRAILING",		SYM(TRAILING)},
   { "TRANSACTION",	SYM(TRANSACTION_SYM)},
   { "TRIGGER",          SYM(TRIGGER_SYM)},
+  { "TRIGGERS",         SYM(TRIGGERS_SYM)},
   { "TRUE",		SYM(TRUE_SYM)},
   { "TRUNCATE",		SYM(TRUNCATE_SYM)},
   { "TYPE",		SYM(TYPE_SYM)},

sql/mysql_priv.h

@@ -1082,6 +1082,7 @@ extern const char **errmesg;			/* Error messages */
 extern const char *myisam_recover_options_str;
 extern const char *in_left_expr_name, *in_additional_cond;
 extern const char * const triggers_file_ext;
+extern const char * const trigname_file_ext;
 extern Eq_creator eq_creator;
 extern Ne_creator ne_creator;
 extern Gt_creator gt_creator;

sql/mysqld.cc

@@ -5722,6 +5722,7 @@ struct show_var_st status_vars[]= {
   {"Com_show_status",	       (char*) offsetof(STATUS_VAR, com_stat[(uint) SQLCOM_SHOW_STATUS]), SHOW_LONG_STATUS},
   {"Com_show_storage_engines", (char*) offsetof(STATUS_VAR, com_stat[(uint) SQLCOM_SHOW_STORAGE_ENGINES]), SHOW_LONG_STATUS},
   {"Com_show_tables",	       (char*) offsetof(STATUS_VAR, com_stat[(uint) SQLCOM_SHOW_TABLES]), SHOW_LONG_STATUS},
+  {"Com_show_triggers",	       (char*) offsetof(STATUS_VAR, com_stat[(uint) SQLCOM_SHOW_TRIGGERS]), SHOW_LONG_STATUS},
   {"Com_show_variables",       (char*) offsetof(STATUS_VAR, com_stat[(uint) SQLCOM_SHOW_VARIABLES]), SHOW_LONG_STATUS},
   {"Com_show_warnings",        (char*) offsetof(STATUS_VAR, com_stat[(uint) SQLCOM_SHOW_WARNS]), SHOW_LONG_STATUS},
   {"Com_slave_start",	       (char*) offsetof(STATUS_VAR, com_stat[(uint) SQLCOM_SLAVE_START]), SHOW_LONG_STATUS},

sql/share/errmsg.txt

@@ -5370,3 +5370,5 @@ ER_SCALE_BIGGER_THAN_PRECISION 42000 S1009
         eng "Scale may not be larger than the precision (column '%-.64s')."
 ER_WRONG_LOCK_OF_SYSTEM_TABLE
         eng "You can't combine write-locking of system '%-.64s.%-.64s' table with other tables"
+ER_TRG_IN_WRONG_SCHEMA  
+	eng "Trigger in wrong schema"

sql/sp.cc

@@ -1442,8 +1442,8 @@ sp_cache_routines_and_add_tables_for_triggers(THD *thd, LEX *lex,
   {
     Sroutine_hash_entry **last_cached_routine_ptr=
                             (Sroutine_hash_entry **)lex->sroutines_list.next;
-    for (int i= 0; i < 3; i++)
+    for (int i= 0; i < (int)TRG_EVENT_MAX; i++)
-      for (int j= 0; j < 2; j++)
+      for (int j= 0; j < (int)TRG_ACTION_MAX; j++)
         if (triggers->bodies[i][j])
         {
           (void)triggers->bodies[i][j]->add_used_tables_to_table_list(thd,

sql/sql_base.cc

@@ -1740,7 +1740,7 @@ static int open_unireg_entry(THD *thd, TABLE *entry, const char *db,
       !my_strcasecmp(system_charset_info, name, "proc"))
     entry->s->system_table= 1;
 
-  if (Table_triggers_list::check_n_load(thd, db, name, entry))
+  if (Table_triggers_list::check_n_load(thd, db, name, entry, 0))
     goto err;
 
   /*

sql/sql_lex.h

@@ -57,6 +57,7 @@ enum enum_sql_command {
   SQLCOM_SHOW_PROCESSLIST, SQLCOM_SHOW_MASTER_STAT, SQLCOM_SHOW_SLAVE_STAT,
   SQLCOM_SHOW_GRANTS, SQLCOM_SHOW_CREATE, SQLCOM_SHOW_CHARSETS,
   SQLCOM_SHOW_COLLATIONS, SQLCOM_SHOW_CREATE_DB, SQLCOM_SHOW_TABLE_STATUS,
+  SQLCOM_SHOW_TRIGGERS,
 
   SQLCOM_LOAD,SQLCOM_SET_OPTION,SQLCOM_LOCK_TABLES,SQLCOM_UNLOCK_TABLES,
   SQLCOM_GRANT,

sql/sql_parse.cc

@@ -2104,6 +2104,7 @@ int prepare_schema_table(THD *thd, LEX *lex, Table_ident *table_ident,
   case SCH_TABLE_NAMES:
   case SCH_TABLES:
   case SCH_VIEWS:
+  case SCH_TRIGGERS:
 #ifdef DONT_ALLOW_SHOW_COMMANDS
     my_message(ER_NOT_ALLOWED_COMMAND,
                ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */

sql/sql_show.cc

@@ -21,6 +21,7 @@
 #include "sql_select.h"                         // For select_describe
 #include "repl_failsafe.h"
 #include "sp_head.h"
+#include "sql_trigger.h"
 #include <my_dir.h>
 
 #ifdef HAVE_BERKELEY_DB
@@ -1696,6 +1697,7 @@ void get_index_field_values(LEX *lex, INDEX_FIELD_VALUES *index_field_values)
     break;
   case SQLCOM_SHOW_TABLES:
   case SQLCOM_SHOW_TABLE_STATUS:
+  case SQLCOM_SHOW_TRIGGERS:
     index_field_values->db_value= lex->current_select->db;
     index_field_values->table_value= wild;
     break;
@@ -2963,6 +2965,73 @@ static int get_schema_constraints_record(THD *thd, struct st_table_list *tables,
 }
 
 
+static bool store_trigger(THD *thd, TABLE *table, const char *db,
+                          const char *tname, LEX_STRING *trigger_name,
+                          enum trg_event_type event,
+                          enum trg_action_time_type timing,
+                          LEX_STRING *trigger_stmt)
+{
+  CHARSET_INFO *cs= system_charset_info;
+  restore_record(table, s->default_values);
+  table->field[1]->store(db, strlen(db), cs);
+  table->field[2]->store(trigger_name->str, trigger_name->length, cs);
+  table->field[3]->store(trg_event_type_names[event].str,
+                         trg_event_type_names[event].length, cs);
+  table->field[5]->store(db, strlen(db), cs);
+  table->field[6]->store(tname, strlen(tname), cs);
+  table->field[9]->store(trigger_stmt->str, trigger_stmt->length, cs);
+  table->field[10]->store("ROW", 3, cs);
+  table->field[11]->store(trg_action_time_type_names[timing].str,
+                          trg_action_time_type_names[timing].length, cs);
+  table->field[14]->store("OLD", 3, cs);
+  table->field[15]->store("NEW", 3, cs);
+  return schema_table_store_record(thd, table);
+}
+
+
+static int get_schema_triggers_record(THD *thd, struct st_table_list *tables,
+				      TABLE *table, bool res,
+				      const char *base_name,
+				      const char *file_name)
+{
+  DBUG_ENTER("get_schema_triggers_record");
+  /*
+    res can be non zero value when processed table is a view or
+    error happened during opening of processed table.
+  */
+  if (res)
+  {
+    if (!tables->view)
+      push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
+                   thd->net.last_errno, thd->net.last_error);
+    thd->clear_error();
+    DBUG_RETURN(0);
+  }
+  if (!tables->view && tables->table->triggers)
+  {
+    Table_triggers_list *triggers= tables->table->triggers;
+    int event, timing;
+    for (event= 0; event < (int)TRG_EVENT_MAX; event++)
+    {
+      for (timing= 0; timing < (int)TRG_ACTION_MAX; timing++)
+      {
+        LEX_STRING trigger_name;
+        LEX_STRING trigger_stmt;
+        if (triggers->get_trigger_info(thd, (enum trg_event_type) event,
+                                       (enum trg_action_time_type)timing,
+                                       &trigger_name, &trigger_stmt))
+          continue;
+        if (store_trigger(thd, table, base_name, file_name, &trigger_name,
+                         (enum trg_event_type) event,
+                         (enum trg_action_time_type) timing, &trigger_stmt))
+          DBUG_RETURN(1);
+      }
+    }
+  }
+  DBUG_RETURN(0);
+}
+
+
 void store_key_column_usage(TABLE *table, const char*db, const char *tname,
                             const char *key_name, uint key_len, 
                             const char *con_type, uint con_len, longlong idx)
@@ -3847,6 +3916,29 @@ ST_FIELD_INFO open_tables_fields_info[]=
 };
 
 
+ST_FIELD_INFO triggers_fields_info[]=
+{
+  {"TRIGGER_CATALOG", FN_REFLEN, MYSQL_TYPE_STRING, 0, 1, 0},
+  {"TRIGGER_SCHEMA",NAME_LEN, MYSQL_TYPE_STRING, 0, 0, 0},
+  {"TRIGGER_NAME", NAME_LEN, MYSQL_TYPE_STRING, 0, 0, "Trigger"},
+  {"EVENT_MANIPULATION", 6, MYSQL_TYPE_STRING, 0, 0, "Event"},
+  {"EVENT_OBJECT_CATALOG", FN_REFLEN, MYSQL_TYPE_STRING, 0, 1, 0},
+  {"EVENT_OBJECT_SCHEMA",NAME_LEN, MYSQL_TYPE_STRING, 0, 0, 0},
+  {"EVENT_OBJECT_TABLE", NAME_LEN, MYSQL_TYPE_STRING, 0, 0, "Table"},
+  {"ACTION_ORDER", 4, MYSQL_TYPE_LONG, 0, 0, 0},
+  {"ACTION_CONDITION", 65535, MYSQL_TYPE_STRING, 0, 1, 0},
+  {"ACTION_STATEMENT", 65535, MYSQL_TYPE_STRING, 0, 0, "Statement"},
+  {"ACTION_ORIENTATION", 9, MYSQL_TYPE_STRING, 0, 0, 0},
+  {"ACTION_TIMING", 6, MYSQL_TYPE_STRING, 0, 0, "Timing"},
+  {"ACTION_REFERENCE_OLD_TABLE", NAME_LEN, MYSQL_TYPE_STRING, 0, 1, 0},
+  {"ACTION_REFERENCE_NEW_TABLE", NAME_LEN, MYSQL_TYPE_STRING, 0, 1, 0},
+  {"ACTION_REFERENCE_OLD_ROW", 3, MYSQL_TYPE_STRING, 0, 0, 0},
+  {"ACTION_REFERENCE_NEW_ROW", 3, MYSQL_TYPE_STRING, 0, 0, 0},
+  {"CREATED", 0, MYSQL_TYPE_TIMESTAMP, 0, 1, "Created"},
+  {0, 0, MYSQL_TYPE_STRING, 0, 0, 0}
+};
+
+
 ST_FIELD_INFO variables_fields_info[]=
 {
   {"Variable_name", 80, MYSQL_TYPE_STRING, 0, 0, "Variable_name"},
@@ -3897,6 +3989,8 @@ ST_SCHEMA_TABLE schema_tables[]=
    fill_open_tables, make_old_format, 0, -1, -1, 1},
   {"STATUS", variables_fields_info, create_schema_table, fill_status, 
    make_old_format, 0, -1, -1, 1},
+  {"TRIGGERS", triggers_fields_info, create_schema_table, 
+   get_all_tables, make_old_format, get_schema_triggers_record, 5, 6, 0},
   {"VARIABLES", variables_fields_info, create_schema_table, fill_variables,
    make_old_format, 0, -1, -1, 1},
   {0, 0, 0, 0, 0, 0, 0, 0, 0}

sql/sql_table.cc

@@ -23,6 +23,8 @@
 #include <hash.h>
 #include <myisam.h>
 #include <my_dir.h>
+#include "sp_head.h"
+#include "sql_trigger.h"
 
 #ifdef __WIN__
 #include <io.h>
@@ -290,16 +292,8 @@ int mysql_rm_table_part2(THD *thd, TABLE_LIST *tables, bool if_exists,
 	if (!(new_error=my_delete(path,MYF(MY_WME))))
         {
 	  some_tables_deleted=1;
-          /*
+          new_error= Table_triggers_list::drop_all_triggers(thd, db,
-            Destroy triggers for this table if there are any.
+                                                            table->table_name);
-
-            We won't need this as soon as we will have new .FRM format,
-            in which we will store trigger definitions in the same .FRM
-            files as table descriptions.
-          */
-          strmov(end, triggers_file_ext);
-          if (!access(path, F_OK))
-            new_error= my_delete(path, MYF(MY_WME));
         }
         error|= new_error;
       }

sql/sql_trigger.cc

@@ -38,6 +38,45 @@ static File_option triggers_file_parameters[]=
 };
 
 
+/*
+  Structure representing contents of .TRN file which are used to support
+  database wide trigger namespace.
+*/
+
+struct st_trigname
+{
+  LEX_STRING trigger_table;
+};
+
+static const LEX_STRING trigname_file_type= {(char *)"TRIGGERNAME", 11};
+
+const char * const trigname_file_ext= ".TRN";
+
+static File_option trigname_file_parameters[]=
+{
+  {{(char*)"trigger_table", 15}, offsetof(struct st_trigname, trigger_table),
+   FILE_OPTIONS_ESTRING},
+  {{0, 0}, 0, FILE_OPTIONS_STRING}
+};
+
+
+const LEX_STRING trg_action_time_type_names[]=
+{
+  { (char *) STRING_WITH_LEN("BEFORE") },
+  { (char *) STRING_WITH_LEN("AFTER") }
+};
+
+const LEX_STRING trg_event_type_names[]=
+{
+  { (char *) STRING_WITH_LEN("INSERT") },
+  { (char *) STRING_WITH_LEN("UPDATE") },
+  { (char *) STRING_WITH_LEN("DELETE") }
+};
+
+
+static TABLE_LIST *add_table_for_trigger(THD *thd, sp_name *trig);
+
+
 /*
   Create or drop trigger for table.
 
@@ -69,6 +108,10 @@ bool mysql_create_or_drop_trigger(THD *thd, TABLE_LIST *tables, bool create)
     But do we want this ?
   */
 
+  if (!create &&
+      !(tables= add_table_for_trigger(thd, thd->lex->spname)))
+    DBUG_RETURN(TRUE);
+
   /* We should have only one table in table list. */
   DBUG_ASSERT(tables->next_global == 0);
 
@@ -174,11 +217,22 @@ bool Table_triggers_list::create_trigger(THD *thd, TABLE_LIST *tables)
 {
   LEX *lex= thd->lex;
   TABLE *table= tables->table;
-  char dir_buff[FN_REFLEN], file_buff[FN_REFLEN];
+  char dir_buff[FN_REFLEN], file_buff[FN_REFLEN], trigname_buff[FN_REFLEN],
-  LEX_STRING dir, file;
+       trigname_path[FN_REFLEN];
+  LEX_STRING dir, file, trigname_file;
   LEX_STRING *trg_def, *name;
   Item_trigger_field *trg_field;
-  List_iterator_fast<LEX_STRING> it(names_list);
+  struct st_trigname trigname;
+
+
+  /* Trigger must be in the same schema as target table. */
+  if (my_strcasecmp(system_charset_info, table->s->db,
+                    lex->spname->m_db.str ? lex->spname->m_db.str :
+                                            thd->db))
+  {
+    my_error(ER_TRG_IN_WRONG_SCHEMA, MYF(0));
+    return 1;
+  }
 
   /* We don't allow creation of several triggers of the same type yet */
   if (bodies[lex->trg_chistics.event][lex->trg_chistics.action_time])
@@ -187,17 +241,6 @@ bool Table_triggers_list::create_trigger(THD *thd, TABLE_LIST *tables)
     return 1;
   }
 
-  /* Let us check if trigger with the same name exists */
-  while ((name= it++))
-  {
-    if (my_strcasecmp(system_charset_info, lex->ident.str,
-                      name->str) == 0)
-    {
-      my_message(ER_TRG_ALREADY_EXISTS, ER(ER_TRG_ALREADY_EXISTS), MYF(0));
-      return 1;
-    }
-  }
-
   /*
     Let us check if all references to fields in old/new versions of row in
     this trigger are ok.
@@ -234,6 +277,25 @@ bool Table_triggers_list::create_trigger(THD *thd, TABLE_LIST *tables)
   file.length=  strxnmov(file_buff, FN_REFLEN, tables->table_name,
                          triggers_file_ext, NullS) - file_buff;
   file.str= file_buff;
+  trigname_file.length= strxnmov(trigname_buff, FN_REFLEN,
+                                 lex->spname->m_name.str,
+                                 trigname_file_ext, NullS) - trigname_buff;
+  trigname_file.str= trigname_buff;
+  strxnmov(trigname_path, FN_REFLEN, dir_buff, trigname_buff, NullS);
+
+  /* Use the filesystem to enforce trigger namespace constraints. */
+  if (!access(trigname_path, F_OK))
+  {
+    my_error(ER_TRG_ALREADY_EXISTS, MYF(0));
+    return 1;
+  }
+
+  trigname.trigger_table.str= tables->table_name;
+  trigname.trigger_table.length= tables->table_name_length;
+
+  if (sql_create_definition_file(&dir, &trigname_file, &trigname_file_type,
+                                 (gptr)&trigname, trigname_file_parameters, 0))
+    return 1;
 
   /*
     Soon we will invalidate table object and thus Table_triggers_list object
@@ -246,13 +308,66 @@ bool Table_triggers_list::create_trigger(THD *thd, TABLE_LIST *tables)
   if (!(trg_def= (LEX_STRING *)alloc_root(&table->mem_root,
                                           sizeof(LEX_STRING))) ||
       definitions_list.push_back(trg_def, &table->mem_root))
-    return 1;
+    goto err_with_cleanup;
 
   trg_def->str= thd->query;
   trg_def->length= thd->query_length;
 
-  return sql_create_definition_file(&dir, &file, &triggers_file_type,
+  if (!sql_create_definition_file(&dir, &file, &triggers_file_type,
-                                    (gptr)this, triggers_file_parameters, 3);
+                                  (gptr)this, triggers_file_parameters, 3))
+    return 0;
+
+err_with_cleanup:
+  my_delete(trigname_path, MYF(MY_WME));
+  return 1;
+}
+
+
+/*
+  Deletes the .TRG file for a table
+
+  SYNOPSIS
+    rm_trigger_file()
+      path       - char buffer of size FN_REFLEN to be used
+                   for constructing path to .TRG file.
+      db         - table's database name
+      table_name - table's name
+
+  RETURN VALUE
+    False - success
+    True  - error
+*/
+
+static bool rm_trigger_file(char *path, char *db, char *table_name)
+{
+  strxnmov(path, FN_REFLEN, mysql_data_home, "/", db, "/", table_name,
+           triggers_file_ext, NullS);
+  unpack_filename(path, path);
+  return my_delete(path, MYF(MY_WME));
+}
+
+
+/*
+  Deletes the .TRN file for a trigger
+
+  SYNOPSIS
+    rm_trigname_file()
+      path       - char buffer of size FN_REFLEN to be used
+                   for constructing path to .TRN file.
+      db         - trigger's database name
+      table_name - trigger's name
+
+  RETURN VALUE
+    False - success
+    True  - error
+*/
+
+static bool rm_trigname_file(char *path, char *db, char *trigger_name)
+{
+  strxnmov(path, FN_REFLEN, mysql_data_home, "/", db, "/", trigger_name,
+           trigname_file_ext, NullS);
+  unpack_filename(path, path);
+  return my_delete(path, MYF(MY_WME));
 }
 
 
@@ -275,12 +390,13 @@ bool Table_triggers_list::drop_trigger(THD *thd, TABLE_LIST *tables)
   LEX_STRING *name;
   List_iterator_fast<LEX_STRING> it_name(names_list);
   List_iterator<LEX_STRING>      it_def(definitions_list);
+  char path[FN_REFLEN];
 
   while ((name= it_name++))
   {
     it_def++;
 
-    if (my_strcasecmp(system_charset_info, lex->ident.str,
+    if (my_strcasecmp(system_charset_info, lex->spname->m_name.str,
                       name->str) == 0)
     {
       /*
@@ -291,18 +407,14 @@ bool Table_triggers_list::drop_trigger(THD *thd, TABLE_LIST *tables)
 
       if (definitions_list.is_empty())
       {
-        char path[FN_REFLEN];
-
         /*
           TODO: Probably instead of removing .TRG file we should move
           to archive directory but this should be done as part of
           parse_file.cc functionality (because we will need it
           elsewhere).
         */
-        strxnmov(path, FN_REFLEN, mysql_data_home, "/", tables->db, "/",
+        if (rm_trigger_file(path, tables->db, tables->table_name))
-                 tables->table_name, triggers_file_ext, NullS);
+          return 1;
-        unpack_filename(path, path);
-        return my_delete(path, MYF(MY_WME));
       }
       else
       {
@@ -317,10 +429,15 @@ bool Table_triggers_list::drop_trigger(THD *thd, TABLE_LIST *tables)
                                triggers_file_ext, NullS) - file_buff;
         file.str= file_buff;
 
-        return sql_create_definition_file(&dir, &file, &triggers_file_type,
+        if (sql_create_definition_file(&dir, &file, &triggers_file_type,
-                                          (gptr)this,
+                                       (gptr)this, triggers_file_parameters,
-                                          triggers_file_parameters, 3);
+                                       3))
+          return 1;
       }
+
+      if (rm_trigname_file(path, tables->db, lex->spname->m_name.str))
+        return 1;
+      return 0;
     }
   }
 
@@ -331,8 +448,8 @@ bool Table_triggers_list::drop_trigger(THD *thd, TABLE_LIST *tables)
 
 Table_triggers_list::~Table_triggers_list()
 {
-  for (int i= 0; i < 3; i++)
+  for (int i= 0; i < (int)TRG_EVENT_MAX; i++)
-    for (int j= 0; j < 2; j++)
+    for (int j= 0; j < (int)TRG_ACTION_MAX; j++)
       delete bodies[i][j];
 
   if (record1_field)
@@ -389,13 +506,16 @@ bool Table_triggers_list::prepare_record1_accessors(TABLE *table)
       db         - table's database name
       table_name - table's name
       table      - pointer to table object
+      names_only - stop after loading trigger names
 
   RETURN VALUE
     False - success
     True  - error
 */
+
 bool Table_triggers_list::check_n_load(THD *thd, const char *db,
-                                       const char *table_name, TABLE *table)
+                                       const char *table_name, TABLE *table,
+                                       bool names_only)
 {
   char path_buff[FN_REFLEN];
   LEX_STRING path;
@@ -451,7 +571,7 @@ bool Table_triggers_list::check_n_load(THD *thd, const char *db,
         TODO: This could be avoided if there is no triggers
               for UPDATE and DELETE.
       */
-      if (triggers->prepare_record1_accessors(table))
+      if (!names_only && triggers->prepare_record1_accessors(table))
         DBUG_RETURN(1);
 
       List_iterator_fast<LEX_STRING> it(triggers->definitions_list);
@@ -471,32 +591,20 @@ bool Table_triggers_list::check_n_load(THD *thd, const char *db,
             Free lex associated resources
             QQ: Do we really need all this stuff here ?
           */
-          if (lex.sphead)
+          delete lex.sphead;
-          {
-            delete lex.sphead;
-            lex.sphead= 0;
-          }
           goto err_with_lex_cleanup;
         }
 
         triggers->bodies[lex.trg_chistics.event]
                              [lex.trg_chistics.action_time]= lex.sphead;
-        lex.sphead= 0;
+        if (triggers->names_list.push_back(&lex.sphead->m_name, &table->mem_root))
+            goto err_with_lex_cleanup;
 
-        if (!(trg_name_buff= alloc_root(&table->mem_root,
+        if (names_only)
-                                        sizeof(LEX_STRING) +
+        {
-                                        lex.ident.length + 1)))
+          lex_end(&lex);
-          goto err_with_lex_cleanup;
+          continue;
-
+        }
-        trg_name_str= (LEX_STRING *)trg_name_buff;
-        trg_name_buff+= sizeof(LEX_STRING);
-        memcpy(trg_name_buff, lex.ident.str,
-               lex.ident.length + 1);
-        trg_name_str->str= trg_name_buff;
-        trg_name_str->length= lex.ident.length;
-
-        if (triggers->names_list.push_back(trg_name_str, &table->mem_root))
-          goto err_with_lex_cleanup;
 
         /*
           Let us bind Item_trigger_field objects representing access to fields
@@ -537,3 +645,160 @@ err_with_lex_cleanup:
 
   DBUG_RETURN(1);
 }
+
+
+/*
+  Obtains and returns trigger metadata
+
+  SYNOPSIS
+    get_trigger_info()
+      thd       - current thread context
+      event     - trigger event type
+      time_type - trigger action time
+      name      - returns name of trigger
+      stmt      - returns statement of trigger
+
+  RETURN VALUE
+    False - success
+    True  - error
+*/
+
+bool Table_triggers_list::get_trigger_info(THD *thd, trg_event_type event,
+                                           trg_action_time_type time_type,
+                                           LEX_STRING *trigger_name,
+                                           LEX_STRING *trigger_stmt)
+{
+  sp_head *body;
+  DBUG_ENTER("get_trigger_info");
+  if ((body= bodies[event][time_type]))
+  {
+    *trigger_name= body->m_name;
+    *trigger_stmt= body->m_body;
+    DBUG_RETURN(0);
+  }
+  DBUG_RETURN(1);
+}
+
+
+/*
+  Find trigger's table from trigger identifier and add it to
+  the statement table list.
+
+  SYNOPSIS
+    mysql_table_for_trigger()
+      thd    - current thread context
+      trig   - identifier for trigger
+
+  RETURN VALUE
+    0 - error
+    # - pointer to TABLE_LIST object for the table
+*/
+
+static TABLE_LIST *add_table_for_trigger(THD *thd, sp_name *trig)
+{
+  const char *db= !trig->m_db.str ? thd->db : trig->m_db.str;
+  LEX *lex= thd->lex;
+  char path_buff[FN_REFLEN];
+  LEX_STRING path;
+  File_parser *parser;
+  struct st_trigname trigname;
+  DBUG_ENTER("add_table_for_trigger");
+
+  strxnmov(path_buff, FN_REFLEN, mysql_data_home, "/", db, "/",
+           trig->m_name.str, trigname_file_ext, NullS);
+  path.length= unpack_filename(path_buff, path_buff);
+  path.str= path_buff;
+
+  if (access(path_buff, F_OK))
+  {
+    my_error(ER_TRG_DOES_NOT_EXIST, MYF(0));
+    DBUG_RETURN(0);
+  }
+
+  if (!(parser= sql_parse_prepare(&path, thd->mem_root, 1)))
+    DBUG_RETURN(0);
+
+  if (strncmp(trigname_file_type.str, parser->type()->str,
+              parser->type()->length))
+  {
+    my_error(ER_WRONG_OBJECT, MYF(0), trig->m_name.str, trigname_file_ext,
+             "TRIGGERNAME");
+    DBUG_RETURN(0);
+  }
+
+  if (parser->parse((gptr)&trigname, thd->mem_root,
+                    trigname_file_parameters, 1))
+    DBUG_RETURN(0);
+
+  /* We need to reset statement table list to be PS/SP friendly. */
+  lex->query_tables= 0;
+  lex->query_tables_last= &lex->query_tables;
+  DBUG_RETURN(sp_add_to_query_tables(thd, lex, db,
+                                     trigname.trigger_table.str, TL_WRITE));
+}
+
+
+/*
+  Drop all triggers for table.
+
+  SYNOPSIS
+    drop_all_triggers()
+      thd    - current thread context
+      db     - schema for table
+      name   - name for table
+
+  NOTE
+    The calling thread should hold the LOCK_open mutex;
+
+  RETURN VALUE
+    False - success
+    True  - error
+*/
+
+bool Table_triggers_list::drop_all_triggers(THD *thd, char *db, char *name)
+{
+  TABLE table;
+  char path[FN_REFLEN];
+  bool result= 0;
+  DBUG_ENTER("drop_all_triggers");
+
+  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, name, &table, 1))
+  {
+    result= 1;
+    goto end;
+  }
+  if (table.triggers)
+  {
+    LEX_STRING *trigger;
+    List_iterator_fast<LEX_STRING> it_name(table.triggers->names_list);
+
+    while ((trigger= it_name++))
+    {
+      if (rm_trigname_file(path, db, trigger->str))
+      {
+        /*
+          Instead of immediately bailing out with error if we were unable
+          to remove .TRN file we will try to drop other files.
+        */
+        result= 1;
+        continue;
+      }
+    }
+
+    if (rm_trigger_file(path, db, name))
+    {
+      result= 1;
+      goto end;
+    }
+  }
+end:
+  if (table.triggers)
+    delete table.triggers;
+  free_root(&table.mem_root, MYF(0));
+  DBUG_RETURN(result);
+}

sql/sql_trigger.h

@@ -23,7 +23,7 @@
 class Table_triggers_list: public Sql_alloc
 {
   /* Triggers as SPs grouped by event, action_time */
-  sp_head           *bodies[3][2];
+  sp_head           *bodies[TRG_EVENT_MAX][TRG_ACTION_MAX];
   /*
     Copy of TABLE::Field array with field pointers set to TABLE::record[1]
     buffer instead of TABLE::record[0] (used for OLD values in on UPDATE
@@ -121,9 +121,13 @@ public:
 
     return res;
   }
+  bool get_trigger_info(THD *thd, trg_event_type event,
+                        trg_action_time_type time_type,
+                        LEX_STRING *trigger_name, LEX_STRING *trigger_stmt);
 
   static bool check_n_load(THD *thd, const char *db, const char *table_name,
-                           TABLE *table);
+                           TABLE *table, bool names_only);
+  static bool drop_all_triggers(THD *thd, char *db, char *table_name);
 
   bool has_delete_triggers()
   {
@@ -143,3 +147,6 @@ public:
 private:
   bool prepare_record1_accessors(TABLE *table);
 };
+
+extern const LEX_STRING trg_action_time_type_names[];
+extern const LEX_STRING trg_event_type_names[];

sql/sql_yacc.yy

@@ -599,6 +599,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, ulong *yystacksize);
 %token  TRAILING
 %token  TRANSACTION_SYM
 %token  TRIGGER_SYM
+%token  TRIGGERS_SYM
 %token  TRIM
 %token  TRUE_SYM
 %token  TRUNCATE_SYM
@@ -1266,7 +1267,7 @@ create:
 	  }
 	  opt_view_list AS select_init check_option
 	  {}
-        | CREATE TRIGGER_SYM ident trg_action_time trg_event 
+        | CREATE TRIGGER_SYM sp_name trg_action_time trg_event 
           ON table_ident FOR_SYM EACH_SYM ROW_SYM
           {
             LEX *lex= Lex;
@@ -1285,6 +1286,7 @@ create:
             
             sp->m_type= TYPE_ENUM_TRIGGER;
             lex->sphead= sp;
+            lex->spname= $3;
             /*
               We have to turn of CLIENT_MULTI_QUERIES while parsing a
               stored procedure, otherwise yylex will chop it into pieces
@@ -1295,7 +1297,7 @@ create:
             
             bzero((char *)&lex->sp_chistics, sizeof(st_sp_chistics));
             lex->sphead->m_chistics= &lex->sp_chistics;
-            lex->sphead->m_body_begin= lex->tok_start;
+            lex->sphead->m_body_begin= lex->ptr;
           }
           sp_proc_stmt
           {
@@ -1303,14 +1305,12 @@ create:
             sp_head *sp= lex->sphead;
             
             lex->sql_command= SQLCOM_CREATE_TRIGGER;
-            sp->init_strings(YYTHD, lex, NULL);
+            sp->init_strings(YYTHD, lex, $3);
             /* Restore flag if it was cleared above */
             if (sp->m_old_cmq)
               YYTHD->client_capabilities |= CLIENT_MULTI_QUERIES;
             sp->restore_thd_mem_root(YYTHD);
 
-            lex->ident= $3;
-
             /*
               We have to do it after parsing trigger body, because some of
               sp_proc_stmt alternatives are not saving/restoring LEX, so
@@ -5919,19 +5919,11 @@ drop:
 	    lex->sql_command= SQLCOM_DROP_VIEW;
 	    lex->drop_if_exists= $3;
 	  }
-        | DROP TRIGGER_SYM ident '.' ident
+        | DROP TRIGGER_SYM sp_name
           {
             LEX *lex= Lex;
-
             lex->sql_command= SQLCOM_DROP_TRIGGER;
-            /* QQ: Could we loosen lock type in certain cases ? */
+            lex->spname= $3;
-            if (!lex->select_lex.add_table_to_list(YYTHD,
-                                                   new Table_ident($3),
-                                                   (LEX_STRING*) 0,
-                                                   TL_OPTION_UPDATING,
-                                                   TL_WRITE))
-              YYABORT;
-            lex->ident= $5;
           }
 	;
 
@@ -6296,6 +6288,15 @@ show_param:
              if (prepare_schema_table(YYTHD, lex, 0, SCH_TABLE_NAMES))
                YYABORT;
            }
+         | opt_full TRIGGERS_SYM opt_db wild_and_where
+           {
+             LEX *lex= Lex;
+             lex->sql_command= SQLCOM_SELECT;
+             lex->orig_sql_command= SQLCOM_SHOW_TRIGGERS;
+             lex->select_lex.db= $3;
+             if (prepare_schema_table(YYTHD, lex, 0, SCH_TRIGGERS))
+               YYABORT;
+           }
          | TABLE_SYM STATUS_SYM opt_db wild_and_where
            {
              LEX *lex= Lex;
@@ -7590,6 +7591,7 @@ keyword_sp:
 	| TEMPTABLE_SYM		{}
 	| TEXT_SYM		{}
 	| TRANSACTION_SYM	{}
+	| TRIGGERS_SYM		{}
 	| TIMESTAMP		{}
 	| TIMESTAMP_ADD		{}
 	| TIMESTAMP_DIFF	{}

sql/table.h

@@ -282,7 +282,7 @@ enum enum_schema_tables
   SCH_COLLATION_CHARACTER_SET_APPLICABILITY, SCH_PROCEDURES, SCH_STATISTICS,
   SCH_VIEWS, SCH_USER_PRIVILEGES, SCH_SCHEMA_PRIVILEGES, SCH_TABLE_PRIVILEGES,
   SCH_COLUMN_PRIVILEGES, SCH_TABLE_CONSTRAINTS, SCH_KEY_COLUMN_USAGE,
-  SCH_TABLE_NAMES, SCH_OPEN_TABLES, SCH_STATUS, SCH_VARIABLES
+  SCH_TABLE_NAMES, SCH_OPEN_TABLES, SCH_STATUS, SCH_TRIGGERS, SCH_VARIABLES
 };