This is a large push. Included are :

* multi-table updates
* new paid feature for limiting number of queries per hour for users
* optional syntax for multi-table deletes
* optimization for SQL_CALC_FOUND_ROWS
* a small addition for CREATE .. SELECT that will be of future use

I know that all this will require many additions to documentation, 
which I have not done, but I am at Arjen's disposal to help him document
all this.



libmysqld/lib_sql.cc:
  This is a small change required due to new paid feature of limiting 
  number of queries per hour for each user.
mysql-test/r/multi_update.result:
  Change of the result to accomodate multi-table updates
mysql-test/t/multi_update.test:
  Change in multi-table tests to accomodate multi-table updates
BitKeeper/etc/ignore:
  Added 50 sql/new.cc to the ignore list
scripts/mysql_install_db.sh:
  This is a small change required due to new paid feature of limiting 
  number of queries per hour for each user.
sql/item_timefunc.h:
  This is a small feature that will be of use later in the proper 
  creation of the tables out of CREATE ... SELECT...
  
  Further changes will come after this resolve/push/test passes ..
sql/lex.h:
  This is a small change required due to new paid feature of limiting 
  number of queries per hour for each user.
sql/mysql_priv.h:
  This is a small change required due to new paid feature of limiting 
  number of queries per hour for each user.
sql/mysqld.cc:
  This is a small change required due to new paid feature of limiting 
  number of queries per hour for each user.
sql/sql_acl.cc:
  This is a small change required due to new paid feature of limiting 
  number of queries per hour for each user.
sql/sql_acl.h:
  This is a small change required due to new paid feature of limiting 
  number of queries per hour for each user.
sql/sql_class.h:
  These are changes required for multi-table updates.
sql/sql_lex.h:
  Changes required for both multi-table updates and limiting number of 
  queries per hour (paid feature).
sql/sql_parse.cc:
  Ha ! So many changes. 
  
  * multi-table updates
  * limiting number of queries per hour for users
sql/sql_select.cc:
  Optimisation for SQL_CALC_FOUND_ROWS, when a query involves a single
  table, without WHERE or GROUP clause
sql/sql_update.cc:
  multi-table updates
sql/sql_yacc.yy:
  Many things :
  * multi-table updates
  * limiting number of queries per hour for users
  * new optional syntax for multi-table deletes. This one is different 
    from the one demanded by user. USING clause MUST include ALL tables, 
    not just the ones that are used and not deleted from.

.bzrignore

@@ -425,3 +425,5 @@ vio/test-sslclient
 vio/test-sslserver
 vio/viotest-ssl
 libmysqld/mf_iocache.cc
+50
+sql/new.cc

libmysqld/lib_sql.cc

@@ -228,11 +228,11 @@ check_connections2(THD * thd)
   return 0;
 }
 
-
 static bool check_user(THD *thd,enum_server_command command, const char *user,
 		       const char *passwd, const char *db, bool check_count)
 {
   NET *net= &thd->net;
+  uint max=0;
   thd->db=0;
 
   if (!(thd->user = my_strdup(user, MYF(0))))
@@ -244,7 +244,7 @@ static bool check_user(THD *thd,enum_server_command command, const char *user,
 				 passwd, thd->scramble, &thd->priv_user,
 				 protocol_version == 9 ||
 				 !(thd->client_capabilities &
-				   CLIENT_LONG_PASSWORD));
+				   CLIENT_LONG_PASSWORD),&max);
   DBUG_PRINT("general",
 	     ("Capabilities: %d  packet_length: %d  Host: '%s'  User: '%s'  Using password: %s  Access: %u  db: '%s'",
 	      thd->client_capabilities, thd->max_packet_length,

mysql-test/r/multi_update.result

@@ -2,32 +2,33 @@ drop table if exists t1,t2,t3;
 create table t1(id1 int not null auto_increment primary key, t char(12));
 create table t2(id2 int not null, t char(12));
 create table t3(id3 int not null, t char(12), index(id3));
-delete t1.*, t2.*, t3.*  from t1,t2,t3 where t1.id1 = t2.id2 and t2.id2 = t3.id3  and t1.id1 > 9500;
+update t1,t2,t3 set t1.t="aaa", t2.t="bbb", t3.t="cc" where  t1.id1 = t2.id2 and t2.id2 = t3.id3  and t1.id1 > 90;
+delete t1.*, t2.*, t3.*  from t1,t2,t3 where t1.id1 = t2.id2 and t2.id2 = t3.id3  and t1.id1 > 95;
 check table t1, t2, t3;
 Table	Op	Msg_type	Msg_text
 test.t1	check	status	OK
 test.t2	check	status	OK
 test.t3	check	status	OK
-select count(*) from t1 where id1 > 9500;
+select count(*) from t1 where id1 > 95;
 count(*)
 0
-select count(*) from t2 where id2 > 9500;
+select count(*) from t2 where id2 > 95;
 count(*)
 0
-select count(*) from t3 where id3 > 9500;
+select count(*) from t3 where id3 > 95;
 count(*)
 0
-delete t1, t2, t3  from t1,t2,t3 where t1.id1 = t2.id2 and t2.id2 = t3.id3  and t1.id1 > 500;
-select count(*) from t1 where id1 > 500;
+delete t1, t2, t3  from t1,t2,t3 where t1.id1 = t2.id2 and t2.id2 = t3.id3  and t1.id1 > 5;
+select count(*) from t1 where id1 > 5;
 count(*)
 0
-select count(*) from t2 where id2 > 500;
+select count(*) from t2 where id2 > 5;
 count(*)
 0
-select count(*) from t3 where id3 > 500;
+select count(*) from t3 where id3 > 5;
 count(*)
 0
-delete t1, t2, t3  from t1,t2,t3 where t1.id1 = t2.id2 and t2.id2 = t3.id3  and t1.id1 > 0;
+delete from t1, t2, t3  using t1,t2,t3 where t1.id1 = t2.id2 and t2.id2 = t3.id3  and t1.id1 > 0;
 select count(*) from t1 where id1;
 count(*)
 0

mysql-test/t/multi_update.test

@@ -2,15 +2,15 @@
 # Only run the test if we are using --big-test, because this test takes a
 # long time
 #
--- require r/big_test.require
-eval select $BIG_TEST as using_big_test;
+#-- require r/big_test.require
+#eval select $BIG_TEST as using_big_test;
 
 drop table if exists t1,t2,t3;
 create table t1(id1 int not null auto_increment primary key, t char(12));
 create table t2(id2 int not null, t char(12));
 create table t3(id3 int not null, t char(12), index(id3));
 disable_query_log;
-let $1 = 10000;
+let $1 = 100;
 while ($1)
  {
   let $2 = 5;
@@ -29,20 +29,21 @@ while ($1)
   dec $1;
  }
 enable_query_log;
-delete t1.*, t2.*, t3.*  from t1,t2,t3 where t1.id1 = t2.id2 and t2.id2 = t3.id3  and t1.id1 > 9500;
+update t1,t2,t3 set t1.t="aaa", t2.t="bbb", t3.t="cc" where  t1.id1 = t2.id2 and t2.id2 = t3.id3  and t1.id1 > 90;
+delete t1.*, t2.*, t3.*  from t1,t2,t3 where t1.id1 = t2.id2 and t2.id2 = t3.id3  and t1.id1 > 95;
 
 check table t1, t2, t3;
 
-select count(*) from t1 where id1 > 9500;
-select count(*) from t2 where id2 > 9500;
-select count(*) from t3 where id3 > 9500;
+select count(*) from t1 where id1 > 95;
+select count(*) from t2 where id2 > 95;
+select count(*) from t3 where id3 > 95;
 
-delete t1, t2, t3  from t1,t2,t3 where t1.id1 = t2.id2 and t2.id2 = t3.id3  and t1.id1 > 500;
-select count(*) from t1 where id1 > 500;
-select count(*) from t2 where id2 > 500;
-select count(*) from t3 where id3 > 500;
+delete t1, t2, t3  from t1,t2,t3 where t1.id1 = t2.id2 and t2.id2 = t3.id3  and t1.id1 > 5;
+select count(*) from t1 where id1 > 5;
+select count(*) from t2 where id2 > 5;
+select count(*) from t3 where id3 > 5;
 
-delete t1, t2, t3  from t1,t2,t3 where t1.id1 = t2.id2 and t2.id2 = t3.id3  and t1.id1 > 0;
+delete from t1, t2, t3  using t1,t2,t3 where t1.id1 = t2.id2 and t2.id2 = t3.id3  and t1.id1 > 0;
 
 # These queries will force a scan of the table
 select count(*) from t1 where id1;

scripts/mysql_install_db.sh

@@ -228,18 +228,21 @@ then
   c_u="$c_u   ssl_cipher BLOB NOT NULL,"
   c_u="$c_u   x509_issuer BLOB NOT NULL,"
   c_u="$c_u   x509_subject BLOB NOT NULL,"
+  c_u="$c_u   max_questions int(11) unsigned DEFAULT 0  NOT NULL,"
+  c_u="$c_u   max_updates int(11) unsigned DEFAULT 0  NOT NULL,"
+  c_u="$c_u   max_connections int(11) unsigned DEFAULT 0  NOT NULL,"
   c_u="$c_u   PRIMARY KEY Host (Host,User)"
   c_u="$c_u )"
   c_u="$c_u comment='Users and global privileges';"
 
-  i_u="INSERT INTO user VALUES ('localhost','root','','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','NONE','','','');
-  INSERT INTO user VALUES ('$hostname','root','','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','NONE','','','');
+  i_u="INSERT INTO user VALUES ('localhost','root','','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','NONE','','','',0,0,0);
+  INSERT INTO user VALUES ('$hostname','root','','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','NONE','','','',0,0,0);
   
-  REPLACE INTO user VALUES ('localhost','root','','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','NONE','','','');
-  REPLACE INTO user VALUES ('$hostname','root','','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','NONE','','','');
+  REPLACE INTO user VALUES ('localhost','root','','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','NONE','','','',0,0,0);
+  REPLACE INTO user VALUES ('$hostname','root','','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','NONE','','','',0,0,0);
   
-  INSERT INTO user VALUES ('localhost','','','N','N','N','N','N','N','N','N','N','N','N','N','N','N','NONE','','','');
-  INSERT INTO user VALUES ('$hostname','','','N','N','N','N','N','N','N','N','N','N','N','N','N','N','NONE','','','');"
+  INSERT INTO user VALUES ('localhost','','','N','N','N','N','N','N','N','N','N','N','N','N','N','N','NONE','','','',0,0,0);
+  INSERT INTO user VALUES ('$hostname','','','N','N','N','N','N','N','N','N','N','N','N','N','N','N','NONE','','','',0,0,0);"
 fi
 
 if test ! -f $mdata/func.frm

scripts/mysql_new_fix_privilege_tables.sh

+#!/bin/sh
+
+echo "This scripts updates the mysql.user, mysql.db, mysql.host and the"
+echo "mysql.func table to MySQL 3.22.14 and above."
+echo ""
+echo "This is needed if you want to use the new GRANT functions,"
+echo "CREATE AGGREAGATE FUNCTION or want to use the more secure passwords in 3.23"
+echo ""
+echo "If you get Access denied errors, you should run this script again"
+echo "and give the MySQL root user password as a argument!"
+
+root_password="$1"
+host="localhost"
+
+# Fix old password format, add File_priv and func table
+echo ""
+echo "If your tables are already up to date or partially up to date you will"
+echo "get some warnings about 'Duplicated column name'. You can safely ignore these!"
+
+@bindir@/mysql -f --user=root --password="$root_password" --host="$host" mysql <<END_OF_DATA
+alter table user add max_questions int(11) unsigned DEFAULT 0  NOT NULL;
+alter table user add max_updates int(11) unsigned DEFAULT 0  NOT NULL;
+alter table user add max_connections int(11) unsigned DEFAULT 0  NOT NULL;
+END_OF_DATA

sql/item_timefunc.h

@@ -229,6 +229,23 @@ public:
   const char *func_name() const { return "date"; }
   void fix_length_and_dec() { decimals=0; max_length=10; }
   bool save_in_field(Field *to);
+  void make_field(Send_field *tmp_field)
+  {
+    init_make_field(tmp_field,FIELD_TYPE_DATE);
+  }
+};
+
+
+class Item_date_func :public Item_str_func
+{
+public:
+  Item_date_func() :Item_str_func() {}
+  Item_date_func(Item *a) :Item_str_func(a) {}
+  Item_date_func(Item *a,Item *b) :Item_str_func(a,b) {}
+  void make_field(Send_field *tmp_field)
+  {
+    init_make_field(tmp_field,FIELD_TYPE_DATETIME);
+  }
 };
 
 
@@ -247,6 +264,10 @@ public:
   { str_value.set(buff,buff_length); return &str_value; }
   const char *func_name() const { return "curtime"; }
   void fix_length_and_dec();
+  void make_field(Send_field *tmp_field)
+  {
+    init_make_field(tmp_field,FIELD_TYPE_TIME);
+  }
 };
 
 
@@ -263,15 +284,15 @@ public:
 };
 
 
-class Item_func_now :public Item_func
+class Item_func_now :public Item_date_func
 {
   longlong value;
   char buff[20];
   uint buff_length;
   TIME ltime;
 public:
-  Item_func_now() :Item_func() {}
-  Item_func_now(Item *a) :Item_func(a) {}
+  Item_func_now() :Item_date_func() {}
+  Item_func_now(Item *a) :Item_date_func(a) {}
   enum Item_result result_type () const { return STRING_RESULT; }
   double val()	     { return (double) value; }
   longlong val_int() { return value; }
@@ -307,16 +328,16 @@ public:
 };
 
 
-class Item_func_from_unixtime :public Item_func
+class Item_func_from_unixtime :public Item_date_func
 {
  public:
-  Item_func_from_unixtime(Item *a) :Item_func(a) {}
+  Item_func_from_unixtime(Item *a) :Item_date_func(a) {}
   double val() { return (double) Item_func_from_unixtime::val_int(); }
   longlong val_int();
   String *val_str(String *str);
   const char *func_name() const { return "from_unixtime"; }
   void fix_length_and_dec() { decimals=0; max_length=19; }
-  enum Item_result result_type () const { return STRING_RESULT; }
+//  enum Item_result result_type () const { return STRING_RESULT; }
   bool get_date(TIME *res,bool fuzzy_date);
 };
 
@@ -330,6 +351,10 @@ public:
   String *val_str(String *);
   void fix_length_and_dec() { maybe_null=1; max_length=13; }
   const char *func_name() const { return "sec_to_time"; }
+  void make_field(Send_field *tmp_field)
+  {
+    init_make_field(tmp_field,FIELD_TYPE_TIME);
+  }
 };
 
 enum interval_type { INTERVAL_YEAR, INTERVAL_MONTH, INTERVAL_DAY,
@@ -339,7 +364,7 @@ enum interval_type { INTERVAL_YEAR, INTERVAL_MONTH, INTERVAL_DAY,
 		     INTERVAL_HOUR_MINUTE, INTERVAL_HOUR_SECOND,
 		     INTERVAL_MINUTE_SECOND};
 
-class Item_date_add_interval :public Item_str_func
+class Item_date_add_interval :public Item_date_func
 {
   const interval_type int_type;
   String value;
@@ -347,7 +372,7 @@ class Item_date_add_interval :public Item_str_func
 
 public:
   Item_date_add_interval(Item *a,Item *b,interval_type type_arg,bool neg_arg)
-    :Item_str_func(a,b),int_type(type_arg), date_sub_interval(neg_arg) {}
+    :Item_date_func(a,b),int_type(type_arg), date_sub_interval(neg_arg) {}
   String *val_str(String *);
   const char *func_name() const { return "date_add_interval"; }
   void fix_length_and_dec() { maybe_null=1; max_length=19; value.alloc(32);}

sql/lex.h

@@ -224,6 +224,7 @@ static SYMBOL symbols[] = {
   { "MASTER_SERVER_ID",           SYM(MASTER_SERVER_ID_SYM),0,0},
   { "MASTER_USER",           SYM(MASTER_USER_SYM),0,0},
   { "MAX_ROWS",		SYM(MAX_ROWS),0,0},
+  { "MAXIMUM",		SYM(MAXIMUM),0,0},
   { "MATCH",		SYM(MATCH),0,0},
   { "MEDIUMBLOB",	SYM(MEDIUMBLOB),0,0},
   { "MEDIUMTEXT",	SYM(MEDIUMTEXT),0,0},
@@ -237,6 +238,7 @@ static SYMBOL symbols[] = {
   { "MODE",		SYM(MODE_SYM),0,0},
   { "MODIFY",		SYM(MODIFY_SYM),0,0},
   { "MONTH",		SYM(MONTH_SYM),0,0},
+  { "MQH",		SYM(MQH_SYM),0,0},
   { "MRG_MYISAM",	SYM(MERGE_SYM),0,0},
   { "MYISAM",		SYM(MYISAM_SYM),0,0},
   { "NATURAL",		SYM(NATURAL),0,0},
@@ -260,6 +262,7 @@ static SYMBOL symbols[] = {
   { "PACK_KEYS",	SYM(PACK_KEYS_SYM),0,0},
   { "PARTIAL",		SYM(PARTIAL),0,0},
   { "PASSWORD",		SYM(PASSWORD),0,0},
+  { "PER",		SYM(PER_SYM),0,0},
   { "PURGE",		SYM(PURGE),0,0},
   { "PRECISION",	SYM(PRECISION),0,0},
   { "PREV",		SYM(PREV_SYM),0,0},
@@ -268,6 +271,7 @@ static SYMBOL symbols[] = {
   { "PROCESS"	,	SYM(PROCESS),0,0},
   { "PROCESSLIST",	SYM(PROCESSLIST_SYM),0,0},
   { "PRIVILEGES",	SYM(PRIVILEGES),0,0},
+  { "QUERIES",	        SYM(QUERIES),0,0},
   { "QUICK",	        SYM(QUICK),0,0},
   { "RAID0",		SYM(RAID_0_SYM),0,0},
   { "READ",		SYM(READ_SYM),0,0},

sql/mysql_priv.h

@@ -492,7 +492,7 @@ int write_record(TABLE *table,COPY_INFO *info);
 /* bits set in manager_status */
 #define MANAGER_BERKELEY_LOG_CLEANUP    (1L << 0)
 extern ulong volatile manager_status;
-extern bool volatile manager_thread_in_use;
+extern bool volatile manager_thread_in_use, mqh_used;
 extern pthread_t manager_thread;
 extern pthread_mutex_t LOCK_manager;
 extern pthread_cond_t COND_manager;

sql/mysqld.cc

@@ -219,6 +219,7 @@ static bool opt_log,opt_update_log,opt_bin_log,opt_slow_log,opt_noacl,
 bool opt_sql_bin_update = 0, opt_log_slave_updates = 0, opt_safe_show_db=0,
   opt_show_slave_auth_info = 0, opt_old_rpl_compat = 0,
   opt_safe_user_create = 0, opt_no_mix_types = 0;
+volatile bool  mqh_used = 0;
 FILE *bootstrap_file=0;
 int segfaulted = 0; // ensure we do not enter SIGSEGV handler twice
 extern MASTER_INFO glob_mi;
@@ -1900,7 +1901,7 @@ The server will not act as a slave.");
   }
   if (!opt_noacl)
     (void) grant_init();
-  if (max_user_connections)
+  if (max_user_connections || mqh_used)
     init_max_user_conn();
 
 #ifdef HAVE_DLOPEN

sql/sql_acl.cc

@@ -58,7 +58,7 @@ class ACL_USER :public ACL_ACCESS
 {
 public:
   acl_host_and_ip host;
-  uint hostname_length;
+  uint hostname_length, questions, updates;
   char *user,*password;
   ulong salt[2];
 #ifdef HAVE_OPENSSL  
@@ -240,6 +240,15 @@ int  acl_init(bool dont_read_acl_tables)
     user.access=get_access(table,3);
     user.sort=get_sort(2,user.host.hostname,user.user);
     user.hostname_length=user.host.hostname ? (uint) strlen(user.host.hostname) : 0;
+    if (table->fields >=23)
+    {
+      char *ptr = get_field(&mem, table, 21);
+      user.questions=atoi(ptr);
+      ptr = get_field(&mem, table, 22);
+      user.updates=atoi(ptr);
+      if (user.questions)
+	mqh_used=true;
+    }
 #ifndef TO_BE_REMOVED
     if (table->fields <= 13)
     {						// Without grant
@@ -423,7 +432,7 @@ static int acl_compare(ACL_ACCESS *a,ACL_ACCESS *b)
 /* Get master privilges for user (priviliges for all tables). Required to connect */
 uint acl_getroot(THD *thd, const char *host, const char *ip, const char *user,
 		 const char *password,const char *message,char **priv_user,
-		 bool old_ver)
+		 bool old_ver, uint *max)
 {
   uint user_access=NO_ACCESS;
   *priv_user=(char*) user;
@@ -536,6 +545,7 @@ uint acl_getroot(THD *thd, const char *host, const char *ip, const char *user,
 #else  /* HAVE_OPENSSL */
 	  user_access=acl_user->access;
 #endif /* HAVE_OPENSSL */
+	  *max=acl_user->questions;
 	  if (!acl_user->user)
 	    *priv_user=(char*) "";	// Change to anonymous user /* purecov: inspected */
 	  break;
@@ -569,6 +579,7 @@ static void acl_update_user(const char *user, const char *host,
 			    const char *ssl_cipher,
 			    const char *x509_issuer,
 			    const char *x509_subject,
+			    unsigned int mqh,
 			    uint privileges)
 {
   for (uint i=0 ; i < acl_users.elements ; i++)
@@ -582,6 +593,7 @@ static void acl_update_user(const char *user, const char *host,
 	  acl_user->host.hostname && !strcmp(host,acl_user->host.hostname))
       {
 	acl_user->access=privileges;
+	acl_user->questions=mqh;
 #ifdef HAVE_OPENSSL
 	acl_user->ssl_type=ssl_type;
         acl_user->ssl_cipher=ssl_cipher;
@@ -611,6 +623,7 @@ static void acl_insert_user(const char *user, const char *host,
 			    const char *ssl_cipher,
 			    const char *x509_issuer,
 			    const char *x509_subject,
+			    unsigned int mqh,
 			    uint privileges)
 {
   ACL_USER acl_user;
@@ -618,6 +631,7 @@ static void acl_insert_user(const char *user, const char *host,
   update_hostname(&acl_user.host,strdup_root(&mem,host));
   acl_user.password=0;
   acl_user.access=privileges;
+  acl_user.questions=mqh;
   acl_user.sort=get_sort(2,acl_user.host.hostname,acl_user.user);
   acl_user.hostname_length=(uint) strlen(acl_user.host.hostname);
 #ifdef HAVE_OPENSSL
@@ -1192,6 +1206,13 @@ static int replace_user_table(THD *thd, TABLE *table, const LEX_USER &combo,
     }
   }
 #endif /* HAVE_OPENSSL */
+  if (table->fields>=23 && thd->lex.mqh)
+  {
+    char buff[33];
+    int len =int2str((long)thd->lex.mqh,buff,10) - buff;
+    table->field[21]->store(buff,len);
+    mqh_used=true;
+  }
   if (old_row_exists)
   {
     /*
@@ -1230,6 +1251,7 @@ end:
 		      thd->lex.ssl_cipher,
 		      thd->lex.x509_issuer,
 		      thd->lex.x509_subject,
+		      thd->lex.mqh,
 		      rights);
     else
       acl_insert_user(combo.user.str,combo.host.str,password,
@@ -1237,6 +1259,7 @@ end:
 		      thd->lex.ssl_cipher,
 		      thd->lex.x509_issuer,
 		      thd->lex.x509_subject,
+		      thd->lex.mqh,
 		      rights);
   }
   table->file->index_end();

sql/sql_acl.h

@@ -61,7 +61,7 @@ uint acl_get(const char *host, const char *ip, const char *bin_ip,
 	     const char *user, const char *db);
 uint acl_getroot(THD *thd, const char *host, const char *ip, const char *user,
 		 const char *password,const char *scramble,char **priv_user,
-		 bool old_ver);
+		 bool old_ver, uint *max);
 bool acl_check_host(const char *host, const char *ip);
 bool change_password(THD *thd, const char *host, const char *user,
 		     char *password);

sql/sql_class.h

@@ -652,4 +652,33 @@ public:
    bool send_eof();
  };
 
+ class multi_update : public select_result {
+   TABLE_LIST *update_tables, *table_being_updated;
+//   Unique  **tempfiles;
+   COPY_INFO *infos;
+   TABLE **tmp_tables;
+   THD *thd;
+   ha_rows updated, found;
+   List<Item> fields;
+   List <Item> **fields_by_tables;
+   thr_lock_type lock_option;
+   enum enum_duplicates dupl;
+   uint num_of_tables, num_fields, num_updated, *save_time_stamps, *field_sequence;
+   int error;
+   bool do_update;
+ public:
+   multi_update(THD *thd_arg, TABLE_LIST *ut, List<Item> &fs, 		 
+		enum enum_duplicates handle_duplicates,  
+		thr_lock_type lock_option_arg, uint num);
+   ~multi_update();
+   int prepare(List<Item> &list);
+   bool send_fields(List<Item> &list,
+ 		   uint flag) { return 0; }
+   bool send_data(List<Item> &items);
+   void initialize_tables (JOIN *join);
+   void send_error(uint errcode,const char *err);
+   int  do_updates (bool from_send_error);
+   bool send_eof();
+ };
+
 

sql/sql_lex.h

@@ -55,7 +55,7 @@ enum enum_sql_command {
   SQLCOM_RESET, SQLCOM_PURGE, SQLCOM_SHOW_BINLOGS,
   SQLCOM_SHOW_OPEN_TABLES, SQLCOM_LOAD_MASTER_DATA,
   SQLCOM_HA_OPEN, SQLCOM_HA_CLOSE, SQLCOM_HA_READ,
-  SQLCOM_SHOW_SLAVE_HOSTS, SQLCOM_MULTI_DELETE,
+  SQLCOM_SHOW_SLAVE_HOSTS, SQLCOM_MULTI_DELETE, SQLCOM_MULTI_UPDATE,
   SQLCOM_SHOW_BINLOG_EVENTS, SQLCOM_SHOW_NEW_MASTER
 };
 
@@ -181,7 +181,7 @@ typedef struct st_lex {
   enum enum_ha_read_modes ha_read_mode;
   enum ha_rkey_function ha_rkey_mode;
   enum enum_enable_or_disable alter_keys_onoff;
-  uint grant,grant_tot_col,which_columns, union_option;
+  uint grant,grant_tot_col,which_columns, union_option, mqh;
   thr_lock_type lock_option;
   bool	drop_primary,drop_if_exists,local_file;
   bool  in_comment,ignore_space,verbose,simple_alter, option_type;

sql/sql_parse.cc

@@ -37,7 +37,7 @@ extern "C" int gethostname(char *name, int namelen);
 #endif
 
 static int check_for_max_user_connections(const char *user, int u_length,
-					  const char *host);
+					  const char *host, uint max);
 static void decrease_user_connections(const char *user, const char *host);
 static bool check_db_used(THD *thd,TABLE_LIST *tables);
 static bool check_merge_table_access(THD *thd, char *db, TABLE_LIST *tables);
@@ -98,6 +98,95 @@ inline bool end_active_trans(THD *thd)
 }
 
 
+static HASH hash_user_connections;
+extern  pthread_mutex_t LOCK_user_conn;
+
+struct  user_conn {
+  char *user;
+  uint len, connections, questions, max;
+  time_t intime;
+};
+
+static byte* get_key_conn(user_conn *buff, uint *length,
+			  my_bool not_used __attribute__((unused)))
+{
+  *length=buff->len;
+  return (byte*) buff->user;
+}
+
+#define DEF_USER_COUNT 50
+
+static void free_user(struct user_conn *uc)
+{
+  my_free((char*) uc,MYF(0));
+}
+
+/*
+** Check if maximum queries per hour limit has been reached
+** returns 0 if OK.
+*/
+
+static bool check_mqh(THD *thd, const char *user, const char *host,uint max)
+{
+  uint temp_len;
+  char temp_user[USERNAME_LENGTH+HOSTNAME_LENGTH+2];
+  struct  user_conn *uc;
+  if (!user)
+    user="";
+  if (!host)
+    host="";
+  temp_len= (uint) (strxnmov(temp_user, sizeof(temp_user), user, "@", host,
+			     NullS) - temp_user);
+//This would be MUCH faster if there was already temp_user made in THD !!! May I ??
+  (void) pthread_mutex_lock(&LOCK_user_conn);
+  uc = (struct  user_conn *) hash_search(&hash_user_connections,
+					 (byte*) temp_user, temp_len);
+  if (uc) /* user found ; check for no. of queries */
+  {
+    bool my_start = thd->start_time != 0;
+    time_t check_time = (my_start) ?  thd->start_time : time(NULL);
+    if (check_time  - uc->intime >= 3600)
+    {
+      uc->questions=(uint)my_start;
+      uc->intime=check_time;
+    }
+    else if (uc->max && ++(uc->questions) > uc->max)
+    {
+      (void) pthread_mutex_unlock(&LOCK_user_conn);
+      send_error(&thd->net,ER_NOT_ALLOWED_COMMAND);	// change this to appropriate message
+      return 1;
+    }
+  }
+  else
+  {
+    struct user_conn *uc= ((struct user_conn*)
+			   my_malloc(sizeof(struct user_conn) + temp_len+1,
+				     MYF(MY_WME)));
+    if (!uc)
+    {
+      send_error(&current_thd->net, 0, NullS);	// Out of memory
+      (void) pthread_mutex_unlock(&LOCK_user_conn);
+      return 1;
+    }      
+    uc->user=(char*) (uc+1);
+    memcpy(uc->user,temp_user,temp_len+1);
+    uc->len = temp_len;
+    uc->connections = 1; 
+    uc->questions=0;
+    uc->max=max;
+    uc->intime=current_thd->thr_create_time;
+    if (hash_insert(&hash_user_connections, (byte*) uc))
+    {
+      my_free((char*) uc,0);
+      send_error(&current_thd->net, 0, NullS);	// Out of memory
+      (void) pthread_mutex_unlock(&LOCK_user_conn);
+      return 1;
+    }
+  }
+  (void) pthread_mutex_unlock(&LOCK_user_conn);
+  return 0;
+}
+
 /*
 ** Check if user is ok
 ** Updates:
@@ -108,6 +197,7 @@ static bool check_user(THD *thd,enum_server_command command, const char *user,
 		       const char *passwd, const char *db, bool check_count)
 {
   NET *net= &thd->net;
+  uint max=0;
   thd->db=0;
 
   if (!(thd->user = my_strdup(user, MYF(0))))
@@ -119,7 +209,7 @@ static bool check_user(THD *thd,enum_server_command command, const char *user,
 				 passwd, thd->scramble, &thd->priv_user,
 				 protocol_version == 9 ||
 				 !(thd->client_capabilities &
-				   CLIENT_LONG_PASSWORD));
+				   CLIENT_LONG_PASSWORD),&max);
   DBUG_PRINT("info",
 	     ("Capabilities: %d  packet_length: %d  Host: '%s'  User: '%s'  Using password: %s  Access: %u  db: '%s'",
 	      thd->client_capabilities, thd->max_packet_length,
@@ -150,6 +240,8 @@ static bool check_user(THD *thd,enum_server_command command, const char *user,
       return(1);
     }
   }
+  if (mqh_used && max && check_mqh(thd,user,thd->host,max))
+    return -1;
   mysql_log.write(thd,command,
 		  (thd->priv_user == thd->user ?
 		   (char*) "%s@%s on %s" :
@@ -159,7 +251,7 @@ static bool check_user(THD *thd,enum_server_command command, const char *user,
 		  db ? db : (char*) "");
   thd->db_access=0;
   if (max_user_connections &&
-      check_for_max_user_connections(user, strlen(user), thd->host))
+      check_for_max_user_connections(user, strlen(user), thd->host, max))
     return -1;
   if (db && db[0])
   {
@@ -179,28 +271,6 @@ static bool check_user(THD *thd,enum_server_command command, const char *user,
 ** variable that is greater then 0
 */
 
-static HASH hash_user_connections;
-extern  pthread_mutex_t LOCK_user_conn;
-
-struct  user_conn {
-  char *user;
-  uint len, connections;
-};
-
-static byte* get_key_conn(user_conn *buff, uint *length,
-			  my_bool not_used __attribute__((unused)))
-{
-  *length=buff->len;
-  return (byte*) buff->user;
-}
-
-#define DEF_USER_COUNT 50
-
-static void free_user(struct user_conn *uc)
-{
-  my_free((char*) uc,MYF(0));
-}
-
 void init_max_user_conn(void) 
 {
   (void) hash_init(&hash_user_connections,DEF_USER_COUNT,0,0,
@@ -210,7 +280,7 @@ void init_max_user_conn(void)
 
 
 static int check_for_max_user_connections(const char *user, int u_length,
-					  const char *host) 
+					  const char *host, uint max) 
 {
   int error=1;
   uint temp_len;
@@ -252,6 +322,9 @@ static int check_for_max_user_connections(const char *user, int u_length,
     memcpy(uc->user,temp_user,temp_len+1);
     uc->len = temp_len;
     uc->connections = 1; 
+    uc->questions=0;
+    uc->max=max;
+    uc->intime=current_thd->thr_create_time;
     if (hash_insert(&hash_user_connections, (byte*) uc))
     {
       my_free((char*) uc,0);
@@ -290,7 +363,7 @@ static void decrease_user_connections(const char *user, const char *host)
   dbug_assert(uc != 0);			// We should always find the user
   if (!uc)
     goto end;				// Safety; Something went wrong
-  if (! --uc->connections)
+  if (! --uc->connections && !mqh_used)
   {
     /* Last connection for user; Delete it */
     (void) hash_delete(&hash_user_connections,(byte*) uc);
@@ -306,7 +379,6 @@ void free_max_user_conn(void)
   hash_free(&hash_user_connections);
 }
 
-
 /*
 ** check connnetion and get priviliges
 ** returns 0 on ok, -1 < if error is given > 0 on error.
@@ -849,6 +921,12 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
       my_pthread_setprio(pthread_self(),QUERY_PRIOR);
     mysql_log.write(thd,command,"%s",thd->query);
     DBUG_PRINT("query",("%s",thd->query));
+    if (mqh_used && check_mqh(thd,thd->user,thd->host,0))
+    {
+      error = TRUE;
+      net->error = 0;
+      break;
+    }
     mysql_parse(thd,thd->query,packet_length-1);
     if (!(specialflag & SPECIAL_NO_PRIOR))
       my_pthread_setprio(pthread_self(),WAIT_PRIOR);
@@ -959,6 +1037,8 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
 	send_error(net,0);
       else
 	send_eof(net);
+      if (mqh_used && hash_user_connections.array.buffer == 0)
+	init_max_user_conn();
       break;
     }
   case COM_SHUTDOWN:
@@ -1092,6 +1172,8 @@ mysql_execute_command(void)
       (table_rules_on && tables && thd->slave_thread &&
        !tables_ok(thd,tables)))
     DBUG_VOID_RETURN;
+  if (lex->sql_command==SQLCOM_UPDATE &&  select_lex->table_list.elements > 1)
+    lex->sql_command=SQLCOM_MULTI_UPDATE; 
 
   switch (lex->sql_command) {
   case SQLCOM_SELECT:
@@ -1727,6 +1809,59 @@ mysql_execute_command(void)
     close_thread_tables(thd);
     break;
   }
+  case SQLCOM_MULTI_UPDATE:
+    multi_update  *result;
+    uint table_count;
+    TABLE_LIST *auxi;
+    if (check_access(thd,UPDATE_ACL,tables->db,&tables->grant.privilege))
+      goto error;
+    if (grant_option && check_grant(thd,UPDATE_ACL,tables))
+      goto error;
+    if (select_lex->item_list.elements != lex->value_list.elements)
+    {
+      send_error(&thd->net,ER_WRONG_VALUE_COUNT);
+      DBUG_VOID_RETURN;
+    }
+    for (auxi=(TABLE_LIST*) tables, table_count=0 ; auxi ; auxi=auxi->next)
+    {
+      table_count++;
+      auxi->lock_type=TL_WRITE;
+    }
+    if (select_lex->order_list.elements || (select_lex->select_limit && select_lex->select_limit < INT_MAX))
+    {
+      send_error(&thd->net,ER_NOT_ALLOWED_COMMAND); /// will have to come up with something better eventually
+      DBUG_VOID_RETURN;
+    }
+    tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
+    if ((res=open_and_lock_tables(thd,tables)))
+      break;
+    if (!setup_fields(thd,tables,select_lex->item_list,1,0,0) && 
+	!setup_fields(thd,tables,lex->value_list,0,0,0) &&  ! thd->fatal_error &&
+	(result=new multi_update(thd,tables,select_lex->item_list,lex->duplicates,
+				 lex->lock_option, table_count)))
+    {
+      List <Item> total_list;
+      List_iterator <Item> field_list(select_lex->item_list);
+      List_iterator <Item> value_list(lex->value_list);
+      Item *item;
+      while ((item=field_list++))
+	total_list.push_back(item);
+      while ((item=value_list++))
+	total_list.push_back(item);
+
+      res=mysql_select(thd,tables,total_list,
+		       select_lex->where,select_lex->ftfunc_list,
+		       (ORDER *)NULL,(ORDER *)NULL,(Item *)NULL,
+		       (ORDER *)NULL,
+		       select_lex->options | thd->options |
+		       SELECT_NO_JOIN_CACHE,
+		       result);
+      delete result;
+    }
+    else
+      res= -1;					// Error is not sent
+    close_thread_tables(thd);
+    break;
   case SQLCOM_DROP_TABLE:
   {
     if (check_table_access(thd,DROP_ACL,tables))
@@ -2080,6 +2215,8 @@ mysql_execute_command(void)
 	}
       }
     }
+    if (mqh_used && hash_user_connections.array.buffer == 0)
+      init_max_user_conn();
     break;
   }
   case SQLCOM_FLUSH:

sql/sql_select.cc

@@ -4730,11 +4730,20 @@ end_send(JOIN *join, JOIN_TAB *join_tab __attribute__((unused)),
     if (++join->send_records >= join->thd->select_limit && join->do_send_rows)
     {
       if (join->select_options & OPTION_FOUND_ROWS)
+      {
+	JOIN_TAB *jt=join->join_tab;
+	if ((join->tables == 1) && !join->tmp_table && !join->sort_and_group && !join->send_group_parts && !join->having && !jt->select_cond )
+	{
+	  join->select_options ^= OPTION_FOUND_ROWS;
+	  join->send_records = jt->records;
+	}
+	else 
 	{
 	  join->do_send_rows=0;
 	  join->thd->select_limit = HA_POS_ERROR;
 	  DBUG_RETURN(0);
 	}
+      }
       DBUG_RETURN(-3);				// Abort nicely
     }
   }

sql/sql_update.cc

@@ -15,10 +15,15 @@
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
 
 
-/* Update of records */
+/* Update of records 
+
+   Multi-table updates were introduced by Monty and Sinisa <sinisa@mysql.com>
+
+*/
 
 #include "mysql_priv.h"
 #include "sql_acl.h"
+#include "sql_select.h"
 
 /* Return 0 if row hasn't changed */
 
@@ -335,3 +340,457 @@ int mysql_update(THD *thd,
   thd->count_cuted_fields=0;			/* calc cuted fields */
   DBUG_RETURN(0);
 }
+
+/***************************************************************************
+** update  multiple tables from join 
+***************************************************************************/
+
+multi_update::multi_update(THD *thd_arg, TABLE_LIST *ut, List<Item> &fs, 		 
+			   enum enum_duplicates handle_duplicates,  thr_lock_type lock_option_arg, uint num)
+  : update_tables (ut), thd(thd_arg), updated(0), found(0), fields(fs), lock_option(lock_option_arg),
+    dupl(handle_duplicates), num_of_tables(num), num_fields(0), num_updated(0) , error(0),  do_update(false)
+{
+  save_time_stamps = (uint *) sql_calloc (sizeof(uint) * num_of_tables);
+  tmp_tables = (TABLE **)NULL;
+  int counter=0;
+  ulong timestamp_query_id;
+  for (TABLE_LIST *dt=ut ; dt ; dt=dt->next,counter++)
+  {
+    TABLE *table=ut->table;
+    (void) ut->table->file->extra(HA_EXTRA_NO_READCHECK);
+    (void) ut->table->file->extra(HA_EXTRA_NO_KEYREAD);
+    dt->table->used_keys=0;
+    if (table->timestamp_field)
+    {
+      // Don't set timestamp column if this is modified
+      timestamp_query_id=table->timestamp_field->query_id;
+      table->timestamp_field->query_id=thd->query_id-1;
+      if (table->timestamp_field->query_id == thd->query_id)
+	table->time_stamp=0;
+      else
+	table->timestamp_field->query_id=timestamp_query_id;
+    }
+    save_time_stamps[counter]=table->time_stamp;
+  }
+  error = 1; // In case we do not reach prepare we have to reset timestamps
+}
+
+int
+multi_update::prepare(List<Item> &values)
+{
+  DBUG_ENTER("multi_update::prepare");
+  do_update = true;   
+  thd->count_cuted_fields=1;
+  thd->cuted_fields=0L;
+  thd->proc_info="updating the  main table";
+  TABLE_LIST *table_ref;
+
+  if (thd->options & OPTION_SAFE_UPDATES)
+  {
+    for (table_ref=update_tables;  table_ref; table_ref=table_ref->next)
+    {
+      TABLE *table=table_ref->table;
+      if ((thd->options & OPTION_SAFE_UPDATES) && !table->quick_keys)
+      {
+	my_error(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE,MYF(0));
+	DBUG_RETURN(1);
+      }
+    }
+  }
+// Here I have to connect fields with tables and only update tables that need to be updated ...
+
+// I calculate num_updated and fill-up table_sequence
+// Set table_list->shared  to true or false, depending on whether table is to be updated or not
+  Item_field *item;
+  List_iterator<Item> it(fields);
+  num_fields=fields.elements;
+  field_sequence = (uint *) sql_alloc(sizeof(uint)*num_fields);
+  uint *int_ptr=field_sequence;
+  while ((item= (Item_field *)it++))
+  {
+    unsigned int counter=0;
+    for (table_ref=update_tables;  table_ref; table_ref=table_ref->next, counter++)
+    {
+      if (table_ref->table == item->field->table && !table_ref->shared)
+      {
+	num_updated++;
+	table_ref->shared=1;
+	break;
+      }
+    }
+    if (!table_ref)
+    {
+      error = 1; // A proper error message is due here 
+      DBUG_RETURN(1);
+    }
+    else
+      *int_ptr++=counter;
+  }
+  if (!num_updated)
+  {
+    error = 1; // A proper error message is due here 
+    DBUG_RETURN(1);
+  }
+
+// Here, I have to allocate the array of temporary tables
+// I have to treat a case of num_updated=1 differently in send_data() method. 
+  if (num_updated > 1)
+  {
+    tmp_tables = (TABLE **) sql_calloc(sizeof(TABLE *) * (num_updated - 1));
+    infos = (COPY_INFO *) sql_calloc(sizeof(COPY_INFO) * (num_updated - 1));
+    fields_by_tables = (List_item **)sql_calloc(sizeof(List_item *) * num_updated);
+    unsigned int counter;
+    List<Item> *temp_fields;
+    for (table_ref=update_tables, counter = 0;  table_ref; table_ref=table_ref->next)
+    {
+      if (!table_ref->shared) 
+	continue;
+// Here we have to add row offset as an additional field ...
+      if (!(temp_fields = (List_item *)sql_calloc(sizeof(List_item))))
+      {
+	error = 1; // A proper error message is due here 
+	DBUG_RETURN(1);
+      }
+      temp_fields->empty();
+      it.rewind(); int_ptr=field_sequence;
+      while ((item= (Item_field *)it++))
+      {
+	if (*int_ptr++ == counter)
+	  temp_fields->push_back(item);
+      }
+      if (counter)
+      {
+	Field_string offset(table_ref->table->file->ref_length,false,"offset",table_ref->table,true);
+	temp_fields->push_front(new Item_field(((Field *)&offset)));
+// Here I make tmp tables
+	int cnt=counter-1;
+	TMP_TABLE_PARAM tmp_table_param;
+	bzero((char*) &tmp_table_param,sizeof(tmp_table_param));
+	tmp_table_param.field_count=temp_fields->elements;
+	if (!(tmp_tables[cnt]=create_tmp_table(thd, &tmp_table_param, *temp_fields,
+						   (ORDER*) 0, 1, 0, 0, TMP_TABLE_ALL_COLUMNS)))
+	{
+	  error = 1; // A proper error message is due here 
+	  DBUG_RETURN(1);
+	}
+	tmp_tables[cnt]->file->extra(HA_EXTRA_WRITE_CACHE);
+	tmp_tables[cnt]->file->extra(HA_EXTRA_IGNORE_DUP_KEY);
+	infos[cnt].handle_duplicates=DUP_IGNORE;
+	temp_fields->pop(); // because we shall use those for values only ...
+      }
+      fields_by_tables[counter]=temp_fields;
+      counter++;
+    }
+  }
+  error = 0; // Timestamps do not need to be restored, so far ...
+  DBUG_RETURN(0);
+}
+
+
+void
+multi_update::initialize_tables(JOIN *join)
+{
+/*   We skip it as it only makes a mess ...........
+  TABLE_LIST *walk;
+  table_map tables_to_update_from=0;
+  for (walk= update_tables ; walk ; walk=walk->next)
+    tables_to_update_from|= walk->table->map;
+  
+  walk= update_tables;
+  for (JOIN_TAB *tab=join->join_tab, *end=join->join_tab+join->tables;
+       tab < end;
+       tab++)
+  {
+    if (tab->table->map & tables_to_update_from)
+    {
+       We are going to update from this table 
+      walk->table=tab->table;
+      walk=walk->next;
+      if (tab == join->join_tab)
+	tab->table->no_keyread=1;
+    }
+  }
+*/
+}
+
+
+multi_update::~multi_update()
+{
+  /* Add back EXTRA_READCHECK;  In 4.0.1 we shouldn't need this anymore */
+  int counter = 0;
+  for (table_being_updated=update_tables ;
+       table_being_updated ;
+       counter++, table_being_updated=table_being_updated->next)
+  {
+    TABLE *table=table_being_updated->table;
+    (void)table->file->extra(HA_EXTRA_READCHECK);
+    if (error) 
+      table->time_stamp=save_time_stamps[counter];
+  }
+  if (tmp_tables)
+    for (uint counter = 0; counter < num_updated-1; counter++)
+      if (tmp_tables[counter])
+	free_tmp_table(thd,tmp_tables[counter]);
+}
+
+
+bool multi_update::send_data(List<Item> &values)
+{
+  List<Item> real_values(values);
+  for (uint counter = 0; counter < fields.elements; counter++)
+    real_values.pop();
+// We have skipped fields ....
+  if (num_updated == 1)
+  {
+    for (table_being_updated=update_tables ;
+	 table_being_updated ;
+	 table_being_updated=table_being_updated->next)
+    {
+      if (!table_being_updated->shared) 
+	continue;
+      TABLE *table=table_being_updated->table;
+      /* Check if we are using outer join and we didn't find the row */
+      if (table->status & (STATUS_NULL_ROW | STATUS_UPDATED))
+	return 0;
+      table->file->position(table->record[0]);
+// Only one table being updated receives a completely different treatment
+      table->status|= STATUS_UPDATED;
+      store_record(table,1); 
+      if (fill_record(fields,real_values))
+	return 1;
+      found++;
+      if (/* compare_record(table, query_id)  && */
+	  !(error=table->file->update_row(table->record[1], table->record[0])))
+	updated++;
+      return error;
+    }
+  }
+  else
+  {
+    int secure_counter= -1;
+    for (table_being_updated=update_tables ;
+	 table_being_updated ;
+	 table_being_updated=table_being_updated->next, secure_counter++)
+    {
+      if (!table_being_updated->shared) 
+	continue;
+      
+      TABLE *table=table_being_updated->table;
+      /* Check if we are using outer join and we didn't find the row */
+      if (table->status & (STATUS_NULL_ROW | STATUS_UPDATED))
+	continue;
+      table->file->position(table->record[0]);
+      Item *item;
+      List_iterator<Item> it(real_values);
+      List <Item> values_by_table;
+      uint *int_ptr=field_sequence;
+      while ((item= (Item *)it++))
+      {
+	if (*int_ptr++ == (uint) (secure_counter + 1))
+	  values_by_table.push_back(item);
+      }
+// Here I am breaking values as per each table    
+      if (secure_counter < 0)
+      {
+	table->status|= STATUS_UPDATED;
+	store_record(table,1); 
+	if (fill_record(*fields_by_tables[0],values_by_table))
+	  return 1;
+	found++;
+	if (/*compare_record(table, query_id)  && */
+	    !(error=table->file->update_row(table->record[1], table->record[0])))
+	  updated++;
+	else
+	{
+	  table->file->print_error(error,MYF(0));
+	  if (!error) error=1;
+	  return 1;
+	}
+      }
+      else
+      {
+// Here I insert into each temporary table
+	values_by_table.push_front(new Item_string(table->file->ref,table->file->ref_length));
+	fill_record(tmp_tables[secure_counter]->field,values_by_table);
+	error= write_record(tmp_tables[secure_counter],&(infos[secure_counter]));
+	if (error)
+	{
+	  error=-1;
+	  return 1;
+	}
+      }
+    }
+  }
+  return 0;
+}
+
+
+/* Return true if some table is not transaction safe */
+
+static bool some_table_is_not_transaction_safe (TABLE_LIST *tl)
+{
+  for (; tl ; tl=tl->next)
+  { 
+    if (!(tl->table->file->has_transactions()))
+      return true;
+  }
+  return false;
+}
+
+
+void multi_update::send_error(uint errcode,const char *err)
+{
+  /* First send error what ever it is ... */
+  ::send_error(&thd->net,errcode,err);
+
+  /* reset used flags */
+  update_tables->table->no_keyread=0;
+
+  /* If nothing updated return */
+  if (!updated)
+    return;
+  /* Below can happen when thread is killed early ... */
+  if (!table_being_updated)
+    table_being_updated=update_tables;
+
+  /*
+    If rows from the first table only has been updated and it is transactional,
+    just do rollback.
+    The same if all tables are transactional, regardless of where we are.
+    In all other cases do attempt updates ...
+  */
+  if ((table_being_updated->table->file->has_transactions() &&
+       table_being_updated == update_tables) ||
+      !some_table_is_not_transaction_safe(update_tables->next))
+    ha_rollback_stmt(thd);
+  else if (do_update)
+    VOID(do_updates(true));
+}
+
+
+int multi_update::do_updates (bool from_send_error)
+{
+  int error = 0, counter = 0;
+
+  if (num_updated == 1) return 0;
+  if (from_send_error)
+  {
+    /* Found out table number for 'table_being_updated' */
+    for (TABLE_LIST *aux=update_tables;
+	 aux != table_being_updated;
+	 aux=aux->next)
+      counter++;
+  }
+  else
+    table_being_updated = update_tables;
+
+  do_update = false;
+  for (table_being_updated=table_being_updated->next;
+       table_being_updated ;
+       table_being_updated=table_being_updated->next, counter++)
+  { 
+    if (!table_being_updated->shared) 
+      continue;
+
+    TABLE *table = table_being_updated->table;
+    TABLE *tmp_table=tmp_tables[counter];
+    if (tmp_table->file->extra(HA_EXTRA_NO_CACHE))
+    {
+      error=1;
+      break;
+    }
+    List<Item> list;
+    Field **ptr=tmp_table->field,*field;
+// This is supposed to be something like insert_fields
+    thd->used_tables|=tmp_table->map;
+    while ((field = *ptr++))
+    {
+      list.push_back((Item *)new Item_field(field));
+      if (field->query_id == thd->query_id)
+	thd->dupp_field=field;
+      field->query_id=thd->query_id;
+      tmp_table->used_keys&=field->part_of_key;
+    }
+    tmp_table->used_fields=tmp_table->fields;
+    error=0; list.pop(); // we get position some other way ...
+    error = tmp_table->file->rnd_init(1);
+    if (error) 
+      return error;
+    bool not_trans_safe = some_table_is_not_transaction_safe(update_tables);
+    while (!(error=tmp_table->file->rnd_next(tmp_table->record[0])) &&
+	   (!thd->killed ||  from_send_error || not_trans_safe))
+    {
+      found++; 
+      error= table->file->rnd_pos(table->record[0], (*(tmp_table->field))->ptr);
+      if (error)
+	return error;
+      table->status|= STATUS_UPDATED;
+      store_record(table,1); 
+      error= fill_record(*fields_by_tables[counter + 1],list) /*|| compare_record(table, query_id)*/  ||
+	table->file->update_row(table->record[1],table->record[0]);
+      if (error)
+      {
+	table->file->print_error(error,MYF(0));
+	break;
+      }
+      else
+	updated++;
+    }
+    if (error == HA_ERR_END_OF_FILE)
+      error = 0;
+  }
+  return error;
+}
+
+
+bool multi_update::send_eof()
+{
+  thd->proc_info="updating the  reference tables";  /* out: 1 if error, 0 if success */
+
+  /* Does updates for the last n - 1 tables, returns 0 if ok */
+  int error = do_updates(false);   /* do_updates returns 0 if success */
+
+  /* reset used flags */
+  update_tables->table->no_keyread=0;
+  if (error == -1) error = 0;
+  thd->proc_info="end";
+  if (error)
+    send_error(error,"An error occured in multi-table update");
+
+  /* Write the SQL statement to the binlog if we updated
+   rows and we succeeded, or also in an error case when there
+   was a non-transaction-safe table involved, since
+   modifications in it cannot be rolled back. */
+
+  if (updated &&
+      (!error || some_table_is_not_transaction_safe(update_tables)))
+  {
+    mysql_update_log.write(thd,thd->query,thd->query_length);
+    Query_log_event qinfo(thd, thd->query);
+
+    /* mysql_bin_log is not open if binlogging or replication
+    is not used */
+
+    if (mysql_bin_log.is_open() &&  mysql_bin_log.write(&qinfo) &&
+	!some_table_is_not_transaction_safe(update_tables))
+      error=1;  /* Log write failed: roll back
+		   the SQL statement */
+
+    /* Commit or rollback the current SQL statement */ 
+
+    VOID(ha_autocommit_or_rollback(thd,error > 0));
+  }
+  else
+    error=0; // this can happen only if it is end of file error
+  if (!error) // if the above log write did not fail ...
+  {
+    char buff[80];
+    sprintf(buff,ER(ER_UPDATE_INFO), (long) found, (long) updated,
+	    (long) thd->cuted_fields);
+    ::send_ok(&thd->net,
+	    (thd->client_capabilities & CLIENT_FOUND_ROWS) ? found : updated,
+	    thd->insert_id_used ? thd->insert_id() : 0L,buff);
+  }
+  thd->count_cuted_fields=0;
+  return 0;
+}

sql/sql_yacc.yy

@@ -80,6 +80,11 @@ bool my_yyoverflow(short **a, YYSTYPE **b,int *yystacksize);
 %token NEXT_SYM
 %token PREV_SYM
 %token SQL_CALC_FOUND_ROWS
+%token QUERIES
+%token MQH_SYM
+%token PER_SYM
+%token MAXIMUM
+
 
 %token	EQ
 %token	EQUAL_SYM
@@ -556,7 +561,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b,int *yystacksize);
 	opt_outer table_list table_name opt_option opt_place opt_low_priority
 	opt_attribute opt_attribute_list attribute column_list column_list_id
 	opt_column_list grant_privileges opt_table user_list grant_option
-	grant_privilege grant_privilege_list
+	grant_privilege grant_privilege_list mqh_option
 	flush_options flush_option insert_lock_option replace_lock_option
 	equal optional_braces opt_key_definition key_usage_list2
 	opt_mi_check_type opt_to mi_check_types normal_join
@@ -2025,7 +2030,12 @@ opt_order_clause:
 	| order_clause
 
 order_clause:
-	ORDER_SYM BY { Select->sort_default=1; } order_list
+	ORDER_SYM BY 
+        { 
+	  if (Lex->sql_command==SQLCOM_MULTI_UPDATE)
+	    YYABORT;
+	  Select->sort_default=1; 
+	} order_list
 
 order_list:
 	order_list ',' order_ident order_dir
@@ -2061,6 +2071,8 @@ limit_clause:
 delete_limit_clause:
 	/* empty */
 	{
+	  if (Lex->sql_command==SQLCOM_MULTI_UPDATE)
+	    YYABORT;
 	  Select->select_limit= HA_POS_ERROR;
 	}
 	| LIMIT ulonglong_num
@@ -2290,11 +2302,7 @@ values:
 /* Update rows in a table */
 
 update:
-	UPDATE_SYM opt_low_priority opt_ignore table_name
-        SET update_list 
-        where_clause 
-        opt_order_clause
-        delete_limit_clause
+        UPDATE_SYM 
 	{ 
 	  LEX *lex=Lex;
           lex->sql_command = SQLCOM_UPDATE;
@@ -2302,6 +2310,7 @@ update:
           lex->select->order_list.first=0;
           lex->select->order_list.next= (byte**) &lex->select->order_list.first;
         }
+        opt_low_priority opt_ignore join_table_list SET update_list where_clause opt_order_clause delete_limit_clause
 
 update_list:
 	update_list ',' simple_ident equal expr
@@ -2353,6 +2362,24 @@ single_multi:
             lex->select->table_list.first=0;
             lex->select->table_list.next= (byte**) &(lex->select->table_list.first);
 	  } join_table_list where_clause
+        | FROM  table_wild_list
+	  {
+	    LEX *lex=Lex;
+	    lex->sql_command =  SQLCOM_MULTI_DELETE;
+            mysql_init_select(lex);
+            lex->select->select_limit=HA_POS_ERROR;
+            lex->auxilliary_table_list.elements=0; 
+            lex->auxilliary_table_list.first=0;
+            lex->auxilliary_table_list.next= (byte**) &(lex->auxilliary_table_list.first);
+          }
+          USING 
+          {
+	    LEX *lex=Lex;
+	    lex->auxilliary_table_list=lex->select_lex.table_list;
+	    lex->select->table_list.elements=0; 
+            lex->select->table_list.first=0;
+            lex->select->table_list.next= (byte**) &(lex->select->table_list.first);
+	  } join_table_list where_clause
 
 
 table_wild_list:
@@ -3267,9 +3294,10 @@ grant:
 	  lex->select->db=0;
 	  lex->ssl_type=SSL_TYPE_NONE;
 	  lex->ssl_cipher=lex->x509_subject=lex->x509_issuer=0;
+	  lex->mqh=0;	
 	}
 	grant_privileges ON opt_table TO_SYM user_list
-	require_clause grant_option 
+	require_clause grant_option mqh_option 
 
 grant_privileges:
 	grant_privilege_list {}
@@ -3460,6 +3488,19 @@ grant_option:
 	/* empty */ {}
 	| WITH GRANT OPTION { Lex->grant |= GRANT_ACL;}
 
+mqh_option:
+	/* empty */ {}
+        | AND WITH short_or_long_one EQ NUM
+        { 
+	  Lex->mqh=atoi($5.str);
+	  if (Lex->mqh > 65535)
+	    YYABORT;
+	}
+
+short_or_long_one:
+	MQH_SYM
+        | MAXIMUM QUERIES PER_SYM HOUR_SYM
+
 begin:
 	BEGIN_SYM   { Lex->sql_command = SQLCOM_BEGIN;} opt_work