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:
  Added tests for new INFORMATION_SCHEMA.TRIGGERS view and SHOW TRIGGERS command.
mysql-test/r/information_schema_db.result:
  INFORMATION_SCHEMA.TRIGGERS view was added.
mysql-test/r/rpl_sp.result:
  Now DROP TRIGGER interprets first part of trigger identifier as database
  name and not as table name. Adjusted tests properly.
mysql-test/r/trigger.result:
  Now DROP TRIGGER interprets first part of trigger identifier as database
  name and not as table name. Adjusted tests properly.
  Added test checking that triggers have database wide namespace.
  Added test for bug #8791 "Triggers: Allowed to create triggers on a subject
  table in a different DB".
mysql-test/r/view.result:
  Now DROP TRIGGER interprets first part of trigger identifier as database
  name and not as table name. Adjusted tests properly.
mysql-test/t/information_schema.test:
  Added tests for new INFORMATION_SCHEMA.TRIGGERS view and SHOW TRIGGERS command.
mysql-test/t/rpl_sp.test:
  Now DROP TRIGGER interprets first part of trigger identifier as database
  name and not as table name. Adjusted tests properly.
mysql-test/t/trigger.test:
  Now DROP TRIGGER interprets first part of trigger identifier as database
  name and not as table name. Adjusted tests properly.
  Added test checking that triggers have database wide namespace.
  Added test for bug #8791 "Triggers: Allowed to create triggers on a subject
  table in a different DB".
mysql-test/t/view.test:
  Now DROP TRIGGER interprets first part of trigger identifier as database
  name and not as table name. Adjusted tests properly.
sql/handler.cc:
  Added .TRN tho the list of known file extensions assoicated with tables.
sql/item.h:
  trg_action_time_type/trg_event_type enums:
    Added TRG_ACTION_MAX/TRG_EVENT_MAX elements which should be used instead of
    magical values in various loops where we iterate through all types of trigger
    action times or/and trigger event types.
sql/lex.h:
  Added new symbol "TRIGGERS".
sql/mysql_priv.h:
  Added declaration of constant holding extension for trigger name (.TRN) files.
sql/mysqld.cc:
  Added statistical variable for SHOW TRIGGERS command.
sql/share/errmsg.txt:
  Added error message saying that one attempts to create trigger in wrong schema.
sql/sp.cc:
  Replaced magical values with TRG_EVENT_MAX/TRG_ACTION_MAX constants.
sql/sql_base.cc:
  open_unireg_entry():
    Now Table_triggers_list::check_n_load() has one more argument which
    controls whether we should prepare Table_triggers_list with fully functional
    triggers or load only their names.
sql/sql_lex.h:
  Added element for new SHOW TRIGGERS command to enum_sql_command enum.
sql/sql_parse.cc:
  prepare_schema_table():
    Added support for SHOW TRIGGERS statement.
sql/sql_show.cc:
  Added new INFORMATION_SCHEMA.TRIGGERS view and SHOW TRIGGERS command.
sql/sql_table.cc:
  mysql_rm_table_part2():
    Replaced simple deletion of .TRG file with call to
    Table_triggers_list::drop_all_triggers which will also delete .TRN files
    for all triggers associated with table.
sql/sql_trigger.cc:
  Now triggers have database wide namespace. To support it we create special .TRN
  file with same name as trigger for each trigger. This file contains name of
  trigger's table so one does not need to specify it explicitly in DROP TRIGGER.
  Moreover DROP TRIGGER treats first part of trigger identifier as database name
  now. Updated mysql_create_or_drop_trigger() routine and
  Table_triggers_list::create_trigger()/drop_trigger()/check_n_load() methods
  accordingly. Added add_table_for_trigger() routine and
  Table_triggers_list::drop_all_triggers() method.
  
  Added Table_triggers_list::get_trigger_info() for obtaining trigger metadata.
sql/sql_trigger.h:
  Table_triggers_list:
    Use TRG_EVENT_MAX, TRG_ACTION_MAX instead of magic values.
    Added get_trigger_info() method for obtaining trigger's meta-data.
    Added drop_all_triggers() method which drops all triggers for table.
    Added declarations of trg_action_time_type_names/trg_event_type_names
    arrays which hold names of triggers action time types  and event types.
sql/sql_yacc.yy:
  Changed grammar for CREATE/DROP TRIGGER to support database wide trigger
  namespace. Added new SHOW TRIGGERS statement.
sql/table.h:
  enum enum_schema_tables:
    Added constant for new INFORMATION_SCHEMA.TRIGGERS view.

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 t1.trg2;
-drop trigger t1.trg3;
+drop trigger trg1;
+drop trigger trg2;
+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;
-drop trigger t1.trg;
+create trigger trg before insert on t3 for each row set @a:=1;
+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 t1.trg2;
+drop trigger trg1;
+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 t1.trg2;
-drop trigger t1.trg3;
+drop trigger trg1;
+drop trigger trg2;
+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 t1.trg2;
+drop trigger trg1;
+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 @@ class Item_insert_value : public Item_field
 */
 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 j= 0; j < 2; j++)
+    for (int i= 0; i < (int)TRG_EVENT_MAX; i++)
+      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;
-          /*
-            Destroy triggers for this table if there are any.
-
-            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));
+          new_error= Table_triggers_list::drop_all_triggers(thd, db,
+                                                            table->table_name);
         }
         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);
 
@@ -174,28 +217,28 @@ 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];
-  LEX_STRING dir, file;
+  char dir_buff[FN_REFLEN], file_buff[FN_REFLEN], trigname_buff[FN_REFLEN],
+       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;
 
-  /* We don't allow creation of several triggers of the same type yet */
-  if (bodies[lex->trg_chistics.event][lex->trg_chistics.action_time])
+
+  /* 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_message(ER_TRG_ALREADY_EXISTS, ER(ER_TRG_ALREADY_EXISTS), MYF(0));
+    my_error(ER_TRG_IN_WRONG_SCHEMA, MYF(0));
     return 1;
   }
 
-  /* Let us check if trigger with the same name exists */
-  while ((name= it++))
+  /* We don't allow creation of several triggers of the same type yet */
+  if (bodies[lex->trg_chistics.event][lex->trg_chistics.action_time])
   {
-    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;
-    }
+    my_message(ER_TRG_ALREADY_EXISTS, ER(ER_TRG_ALREADY_EXISTS), MYF(0));
+    return 1;
   }
 
   /*
@@ -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,
-                                    (gptr)this, triggers_file_parameters, 3);
+  if (!sql_create_definition_file(&dir, &file, &triggers_file_type,
+                                  (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, "/",
-                 tables->table_name, triggers_file_ext, NullS);
-        unpack_filename(path, path);
-        return my_delete(path, MYF(MY_WME));
+        if (rm_trigger_file(path, tables->db, tables->table_name))
+          return 1;
       }
       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,
-                                          (gptr)this,
-                                          triggers_file_parameters, 3);
+        if (sql_create_definition_file(&dir, &file, &triggers_file_type,
+                                       (gptr)this, triggers_file_parameters,
+                                       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 j= 0; j < 2; j++)
+  for (int i= 0; i < (int)TRG_EVENT_MAX; i++)
+    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;
-            lex.sphead= 0;
-          }
+          delete lex.sphead;
           goto err_with_lex_cleanup;
         }
 
         triggers->bodies[lex.trg_chistics.event]
                              [lex.trg_chistics.action_time]= lex.sphead;
-        lex.sphead= 0;
-
-        if (!(trg_name_buff= alloc_root(&table->mem_root,
-                                        sizeof(LEX_STRING) +
-                                        lex.ident.length + 1)))
-          goto err_with_lex_cleanup;
-
-        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(&lex.sphead->m_name, &table->mem_root))
+            goto err_with_lex_cleanup;
 
-        if (triggers->names_list.push_back(trg_name_str, &table->mem_root))
-          goto err_with_lex_cleanup;
+        if (names_only)
+        {
+          lex_end(&lex);
+          continue;
+        }
 
         /*
           Let us bind Item_trigger_field objects representing access to fields
@@ -537,3 +645,160 @@ bool Table_triggers_list::check_n_load(THD *thd, const char *db,
 
   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 @@ class Table_triggers_list: public Sql_alloc
 
     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 @@ class Table_triggers_list: public Sql_alloc
 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 ? */
-            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;
+            lex->spname= $3;
           }
 	;
 
@@ -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
 };