Merge quad.opbmk:/mnt/raid/alik/MySQL/devel/5.1

into  quad.opbmk:/mnt/raid/alik/MySQL/devel/5.1-rt-merged


libmysql/libmysql.c:
  Auto merged
sql-common/client.c:
  Auto merged
sql/mysql_priv.h:
  Auto merged
sql/mysqld.cc:
  Auto merged
tests/mysql_client_test.c:
  Auto merged

25 files changed, 679 insertions, 113 deletions

diff --git a/client/mysqltest.c b/client/mysqltest.c
index 52e02789579..7ef184ae7e8 100644
--- a/client/mysqltest.c
+++ b/client/mysqltest.c
@@ -4221,11 +4221,13 @@ int connect_n_handle_errors(struct st_command *command,
   if (!mysql_real_connect(con, host, user, pass, db, port, sock ? sock: 0,
                           CLIENT_MULTI_STATEMENTS))
   {
+    var_set_errno(mysql_errno(con));
     handle_error(command, mysql_errno(con), mysql_error(con),
 		 mysql_sqlstate(con), ds);
     return 0; /* Not connected */
   }
 
+  var_set_errno(0);
   handle_no_error(command);
   return 1; /* Connected */
 }
diff --git a/libmysql/libmysql.c b/libmysql/libmysql.c
index 13ccd5749a3..15be5e34dff 100644
--- a/libmysql/libmysql.c
+++ b/libmysql/libmysql.c
@@ -2467,7 +2467,7 @@ static my_bool execute(MYSQL_STMT *stmt, char *packet, ulong length)
   int4store(buff+5, 1);                         /* iteration count */
 
   res= test(cli_advanced_command(mysql, COM_STMT_EXECUTE, buff, sizeof(buff),
-                                 (uchar*) packet, length, 1, NULL) ||
+                                 (uchar*) packet, length, 1, stmt) ||
             (*mysql->methods->read_query_result)(mysql));
   stmt->affected_rows= mysql->affected_rows;
   stmt->server_status= mysql->server_status;
@@ -2683,7 +2683,7 @@ stmt_read_row_from_cursor(MYSQL_STMT *stmt, unsigned char **row)
     int4store(buff + 4, stmt->prefetch_rows); /* number of rows to fetch */
     if ((*mysql->methods->advanced_command)(mysql, COM_STMT_FETCH,
                                             buff, sizeof(buff), (uchar*) 0, 0,
-                                            1, NULL))
+                                            1, stmt))
     {
       set_stmt_errmsg(stmt, net);
       return 1;
@@ -3350,7 +3350,7 @@ mysql_stmt_send_long_data(MYSQL_STMT *stmt, uint param_number,
     */
     if ((*mysql->methods->advanced_command)(mysql, COM_STMT_SEND_LONG_DATA,
                                             buff, sizeof(buff), (uchar*) data,
-                                            length, 1, NULL))
+                                            length, 1, stmt))
     {
       set_stmt_errmsg(stmt, &mysql->net);
       DBUG_RETURN(1);
@@ -4748,6 +4748,13 @@ int STDCALL mysql_stmt_store_result(MYSQL_STMT *stmt)
   MYSQL_DATA *result= &stmt->result;
   DBUG_ENTER("mysql_stmt_store_result");
 
+  if (!mysql)
+  {
+    /* mysql can be reset in mysql_close called from mysql_reconnect */
+    set_stmt_error(stmt, CR_SERVER_LOST, unknown_sqlstate, NULL);
+    DBUG_RETURN(1);
+  }
+
   mysql= mysql->last_used_con;
 
   if (!stmt->field_count)
@@ -4773,7 +4780,7 @@ int STDCALL mysql_stmt_store_result(MYSQL_STMT *stmt)
     int4store(buff, stmt->stmt_id);
     int4store(buff + 4, (int)~0); /* number of rows to fetch */
     if (cli_advanced_command(mysql, COM_STMT_FETCH, buff, sizeof(buff),
-                             (uchar*) 0, 0, 1, NULL))
+                             (uchar*) 0, 0, 1, stmt))
     {
       set_stmt_errmsg(stmt, net);
       DBUG_RETURN(1);
@@ -4960,7 +4967,7 @@ static my_bool reset_stmt_handle(MYSQL_STMT *stmt, uint flags)
         uchar buff[MYSQL_STMT_HEADER]; /* packet header: 4 bytes for stmt id */
         int4store(buff, stmt->stmt_id);
         if ((*mysql->methods->advanced_command)(mysql, COM_STMT_RESET, buff,
-                                                sizeof(buff), 0, 0, 0, NULL))
+                                                sizeof(buff), 0, 0, 0, stmt))
         {
           set_stmt_errmsg(stmt, &mysql->net);
           stmt->state= MYSQL_STMT_INIT_DONE;
diff --git a/mysql-test/include/connect2.inc b/mysql-test/include/connect2.inc
new file mode 100644
index 00000000000..6b830a909ed
--- /dev/null
+++ b/mysql-test/include/connect2.inc
@@ -0,0 +1,56 @@
+# include/connect2.inc
+#
+# SUMMARY
+# 
+#   Make several attempts to connect.
+#
+# USAGE
+#
+# EXAMPLE
+# 
+#   connect.test
+#
+
+--disable_query_log
+
+let $wait_counter= 300;
+if ($wait_timeout)
+{
+  let $wait_counter= `SELECT $wait_timeout * 10`;
+}
+# Reset $wait_timeout so that its value won't be used on subsequent
+# calls, and default will be used instead.
+let $wait_timeout= 0;
+
+--echo # -- Establishing connection '$con_name' (user: $con_user_name)...
+
+while ($wait_counter)
+{
+    --disable_abort_on_error
+    --disable_result_log
+    --connect ($con_name,localhost,$con_user_name)
+    --enable_result_log
+    --enable_abort_on_error
+
+    let $error = $mysql_errno;
+
+    if (!$error)
+    {
+        let $wait_counter= 0;
+    }
+    if ($error)
+    {
+        real_sleep 0.1;
+        dec $wait_counter;
+    }
+}
+if ($error)
+{
+  --echo # -- Error: can not establish connection '$con_name'.
+}
+if (!$error)
+{
+  --echo # -- Connection '$con_name' has been established.
+}
+
+--enable_query_log
diff --git a/mysql-test/r/connect.result b/mysql-test/r/connect.result
index 25cf4f90e6d..727433d3032 100644
--- a/mysql-test/r/connect.result
+++ b/mysql-test/r/connect.result
@@ -115,3 +115,106 @@ create temporary table t2(id integer not null auto_increment primary key);
 set @id := 1;
 delete from t1 where id like @id;
 drop table t1;
+# ------------------------------------------------------------------
+# -- End of 4.1 tests
+# ------------------------------------------------------------------
+
+# -- Bug#33507: Event scheduler creates more threads than max_connections
+# -- which results in user lockout.
+
+GRANT USAGE ON *.* TO mysqltest_u1@localhost;
+
+SET GLOBAL max_connections = 3;
+SET GLOBAL event_scheduler = ON;
+
+# -- Waiting for Event Scheduler to start...
+
+# -- Disconnecting default connection...
+
+# -- Check that we allow exactly three user connections, no matter how
+# -- many threads are running.
+
+# -- Connecting (1)...
+# -- Establishing connection 'con_1' (user: mysqltest_u1)...
+# -- Connection 'con_1' has been established.
+
+# -- Connecting (2)...
+# -- Establishing connection 'con_2' (user: mysqltest_u1)...
+# -- Connection 'con_2' has been established.
+
+# -- Connecting (3)...
+# -- Establishing connection 'con_3' (user: mysqltest_u1)...
+# -- Connection 'con_3' has been established.
+
+# -- Connecting (4) [should fail]...
+# -- Establishing connection 'con_4' (user: mysqltest_u1)...
+# -- Error: can not establish connection 'con_4'.
+
+# -- Check that we allow one extra SUPER-user connection.
+
+# -- Connecting super (1)...
+# -- Establishing connection 'con_super_1' (user: root)...
+# -- Connection 'con_super_1' has been established.
+
+# -- Connecting super (2) [should fail]...
+# -- Establishing connection 'con_super_2' (user: root)...
+# -- Error: can not establish connection 'con_super_2'.
+
+# -- Ensure that we have Event Scheduler thread, 3 ordinary user
+# -- connections and one extra super-user connection.
+SELECT user FROM information_schema.processlist ORDER BY id;
+user
+event_scheduler
+mysqltest_u1
+mysqltest_u1
+mysqltest_u1
+root
+
+# -- Resetting variables...
+SET GLOBAL max_connections = 151;
+
+# -- Stopping Event Scheduler...
+SET GLOBAL event_scheduler = OFF;
+
+# -- Waiting for Event Scheduler to stop...
+
+# -- That's it. Closing connections...
+
+# -- Restoring default connection...
+
+# -- Waiting for connections to close...
+
+DROP USER mysqltest_u1@localhost;
+
+# -- End of Bug#33507.
+
+# -- Bug#35074: max_used_connections is not correct. 
+
+FLUSH STATUS;
+
+SHOW STATUS LIKE 'max_used_connections';
+Variable_name	Value
+Max_used_connections	1
+
+# -- Starting Event Scheduler...
+SET GLOBAL event_scheduler = ON;
+# -- Waiting for Event Scheduler to start...
+
+# -- Opening a new connection to check max_used_connections...
+
+# -- Check that max_used_connections hasn't changed.
+SHOW STATUS LIKE 'max_used_connections';
+Variable_name	Value
+Max_used_connections	2
+
+# -- Closing new connection...
+
+# -- Stopping Event Scheduler...
+SET GLOBAL event_scheduler = OFF;
+# -- Waiting for Event Scheduler to stop...
+
+# -- End of Bug#35074.
+
+# ------------------------------------------------------------------
+# -- End of 5.1 tests
+# ------------------------------------------------------------------
diff --git a/mysql-test/r/flush_read_lock_kill.result b/mysql-test/r/flush_read_lock_kill.result
index f69656806da..0b599f343f7 100644
--- a/mysql-test/r/flush_read_lock_kill.result
+++ b/mysql-test/r/flush_read_lock_kill.result
@@ -1,3 +1,4 @@
+set @old_concurrent_insert= @@global.concurrent_insert;
 set @@global.concurrent_insert= 0;
 drop table if exists t1;
 create table t1 (kill_id int);
@@ -8,3 +9,4 @@ select ((@id := kill_id) - kill_id) from t1;
 0
 kill connection @id;
 drop table t1;
+set @@global.concurrent_insert= @old_concurrent_insert;
diff --git a/mysql-test/r/kill.result b/mysql-test/r/kill.result
index a522d18f36b..8b6830d4798 100644
--- a/mysql-test/r/kill.result
+++ b/mysql-test/r/kill.result
@@ -1,3 +1,4 @@
+set @old_concurrent_insert= @@global.concurrent_insert;
 set @@global.concurrent_insert= 0;
 drop table if exists t1, t2, t3;
 create table t1 (kill_id int);
@@ -137,3 +138,4 @@ KILL CONNECTION_ID();
 # of close of the connection socket
 SELECT 1;
 Got one of the listed errors
+set @@global.concurrent_insert= @old_concurrent_insert;
diff --git a/mysql-test/r/query_cache.result b/mysql-test/r/query_cache.result
index 1a728354c7b..ea42b6616a1 100644
--- a/mysql-test/r/query_cache.result
+++ b/mysql-test/r/query_cache.result
@@ -1650,6 +1650,16 @@ a	(select count(*) from t2)
 3	0
 4	0
 drop table t1,t2;
+#
+# Bug#25132 disabled query cache: Qcache_free_blocks = 1
+#
+set global query_cache_size=100000;
+set global query_cache_size=0;
+set global query_cache_type=0;
+show status like 'Qcache_free_blocks';
+Variable_name	Value
+Qcache_free_blocks	0
+Restore default values.
 set GLOBAL query_cache_type=default;
 set GLOBAL query_cache_limit=default;
 set GLOBAL query_cache_min_res_unit=default;
diff --git a/mysql-test/r/sp_notembedded.result b/mysql-test/r/sp_notembedded.result
index 0b1fa565d28..3efb01fdb94 100644
--- a/mysql-test/r/sp_notembedded.result
+++ b/mysql-test/r/sp_notembedded.result
@@ -1,3 +1,5 @@
+set @old_concurrent_insert= @@global.concurrent_insert;
+set @@global.concurrent_insert= 0;
 drop table if exists t1,t3;
 drop procedure if exists bug4902|
 create procedure bug4902()
@@ -17,11 +19,11 @@ begin
 show processlist;
 end|
 call bug4902_2()|
-Id	User	Host	db	Command	Time	State	Info
-#	root	localhost	test	Query	#	NULL	show processlist
+show warnings|
+Level	Code	Message
 call bug4902_2()|
-Id	User	Host	db	Command	Time	State	Info
-#	root	localhost	test	Query	#	NULL	show processlist
+show warnings|
+Level	Code	Message
 drop procedure bug4902_2|
 drop table if exists t1|
 create table t1 (
@@ -68,7 +70,7 @@ c
 2
 show status like 'Qcache_hits'|
 Variable_name	Value
-Qcache_hits	2
+Qcache_hits	0
 set global query_cache_size = @x|
 flush status|
 flush query cache|
@@ -208,3 +210,27 @@ GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' WITH GRANT OPTION
 drop user mysqltest_1@localhost;
 drop procedure 15298_1;
 drop procedure 15298_2;
+drop table if exists t1;
+drop procedure if exists p1;
+create table t1 (value varchar(15));
+create procedure p1() update t1 set value='updated' where value='old';
+call p1();
+insert into t1 (value) values ("old");
+select get_lock('b26162',120);
+get_lock('b26162',120)
+1
+select 'rl_acquirer', value from t1 where get_lock('b26162',120);;
+set session low_priority_updates=on;
+call p1();;
+select 'rl_contender', value from t1;
+rl_contender	value
+rl_contender	old
+select release_lock('b26162');
+release_lock('b26162')
+1
+rl_acquirer	value
+rl_acquirer	old
+drop procedure p1;
+drop table t1;
+set session low_priority_updates=default;
+set @@global.concurrent_insert= @old_concurrent_insert;
diff --git a/mysql-test/r/trigger-trans.result b/mysql-test/r/trigger-trans.result
index cd5f629564f..dccaa27c5fd 100644
--- a/mysql-test/r/trigger-trans.result
+++ b/mysql-test/r/trigger-trans.result
@@ -140,4 +140,23 @@ select * from t3;
 c
 1
 drop table t1, t2, t3;
+DROP TABLE IF EXISTS t1;
+DROP TABLE IF EXISTS t2;
+CREATE TABLE t1(a INT PRIMARY KEY) ENGINE=innodb;
+CREATE TABLE t2(b INT, FOREIGN KEY(b) REFERENCES t1(a)) ENGINE=innodb;
+INSERT INTO t1 VALUES (1);
+CREATE TRIGGER t1_bd BEFORE DELETE ON t1 FOR EACH ROW SET @a = 1;
+CREATE TRIGGER t1_ad AFTER DELETE ON t1 FOR EACH ROW SET @b = 1;
+SET @a = 0;
+SET @b = 0;
+TRUNCATE t1;
+SELECT @a, @b;
+@a	@b
+0	0
+INSERT INTO t1 VALUES (1);
+DELETE FROM t1;
+SELECT @a, @b;
+@a	@b
+1	1
+DROP TABLE t2, t1;
 End of 5.0 tests
diff --git a/mysql-test/t/connect.test b/mysql-test/t/connect.test
index 2e66c24d877..0893bf9ad18 100644
--- a/mysql-test/t/connect.test
+++ b/mysql-test/t/connect.test
@@ -102,4 +102,192 @@ disconnect con7;
 connection default;
 drop table t1;
 
-# End of 4.1 tests
+--disconnect con1
+--disconnect con2
+--disconnect con3
+--disconnect con4
+--disconnect con5
+--disconnect con6
+--disconnect con10
+
+--echo # ------------------------------------------------------------------
+--echo # -- End of 4.1 tests
+--echo # ------------------------------------------------------------------
+
+###########################################################################
+
+--echo
+--echo # -- Bug#33507: Event scheduler creates more threads than max_connections
+--echo # -- which results in user lockout.
+
+--echo
+GRANT USAGE ON *.* TO mysqltest_u1@localhost;
+
+# NOTE: if the test case fails sporadically due to spurious connections,
+# consider disabling all users.
+
+--echo
+let $saved_max_connections = `SELECT @@global.max_connections`;
+SET GLOBAL max_connections = 3;
+SET GLOBAL event_scheduler = ON;
+
+--echo
+--echo # -- Waiting for Event Scheduler to start...
+let $wait_condition =
+  SELECT COUNT(*) = 1
+  FROM information_schema.processlist
+  WHERE user = 'event_scheduler';
+--source include/wait_condition.inc
+
+--echo
+--echo # -- Disconnecting default connection...
+--disconnect default
+
+--echo
+--echo # -- Check that we allow exactly three user connections, no matter how
+--echo # -- many threads are running.
+
+--echo 
+--echo # -- Connecting (1)...
+let $con_name = con_1;
+let $con_user_name = mysqltest_u1;
+--source include/connect2.inc
+
+--echo
+--echo # -- Connecting (2)...
+let $con_name = con_2;
+let $con_user_name = mysqltest_u1;
+--source include/connect2.inc
+
+--echo
+--echo # -- Connecting (3)...
+let $con_name = con_3;
+let $con_user_name = mysqltest_u1;
+--source include/connect2.inc
+
+--echo
+--echo # -- Connecting (4) [should fail]...
+let $con_name = con_4;
+let $con_user_name = mysqltest_u1;
+let $wait_timeout = 5;
+--source include/connect2.inc
+
+--echo
+--echo # -- Check that we allow one extra SUPER-user connection.
+
+--echo
+--echo # -- Connecting super (1)...
+let $con_name = con_super_1;
+let $con_user_name = root;
+--source include/connect2.inc
+
+--echo
+--echo # -- Connecting super (2) [should fail]...
+let $con_name = con_super_2;
+let $con_user_name = root;
+let $wait_timeout = 5;
+--source include/connect2.inc
+
+--echo
+--echo # -- Ensure that we have Event Scheduler thread, 3 ordinary user
+--echo # -- connections and one extra super-user connection.
+SELECT user FROM information_schema.processlist ORDER BY id;
+
+--echo
+--echo # -- Resetting variables...
+--eval SET GLOBAL max_connections = $saved_max_connections
+
+--echo
+--echo # -- Stopping Event Scheduler...
+SET GLOBAL event_scheduler = OFF;
+
+--echo
+--echo # -- Waiting for Event Scheduler to stop...
+let $wait_condition =
+  SELECT COUNT(*) = 0
+  FROM information_schema.processlist
+  WHERE user = 'event_scheduler';
+--source include/wait_condition.inc
+
+--echo
+--echo # -- That's it. Closing connections...
+--disconnect con_1
+--disconnect con_2
+--disconnect con_3
+--disconnect con_super_1
+
+--echo
+--echo # -- Restoring default connection...
+--connect (default,localhost,root,,test)
+
+--echo
+--echo # -- Waiting for connections to close...
+let $wait_condition =
+  SELECT COUNT(*) = 1
+  FROM information_schema.processlist
+  WHERE db = 'test';
+--source include/wait_condition.inc
+
+--echo
+DROP USER mysqltest_u1@localhost;
+
+--echo
+--echo # -- End of Bug#33507.
+--echo
+
+###########################################################################
+
+--echo # -- Bug#35074: max_used_connections is not correct. 
+--echo
+
+FLUSH STATUS;
+
+--echo
+SHOW STATUS LIKE 'max_used_connections';
+
+--echo
+--echo # -- Starting Event Scheduler...
+SET GLOBAL event_scheduler = ON;
+
+--echo # -- Waiting for Event Scheduler to start...
+let $wait_condition =
+  SELECT COUNT(*) = 1
+  FROM information_schema.processlist
+  WHERE user = 'event_scheduler';
+--source include/wait_condition.inc
+
+# NOTE: We should use a new connection here instead of reconnect in order to
+# avoid races (we can not for sure when the connection being disconnected is
+# actually disconnected on the server).
+
+--echo
+--echo # -- Opening a new connection to check max_used_connections...
+--connect (con_1,localhost,root)
+
+--echo
+--echo # -- Check that max_used_connections hasn't changed.
+SHOW STATUS LIKE 'max_used_connections';
+
+--echo
+--echo # -- Closing new connection...
+--disconnect con_1
+--connection default
+
+--echo
+--echo # -- Stopping Event Scheduler...
+SET GLOBAL event_scheduler = OFF;
+
+--echo # -- Waiting for Event Scheduler to stop...
+let $wait_condition =
+  SELECT COUNT(*) = 0
+  FROM information_schema.processlist
+  WHERE user = 'event_scheduler';
+--source include/wait_condition.inc
+
+--echo
+--echo # -- End of Bug#35074.
+--echo
+
+--echo # ------------------------------------------------------------------
+--echo # -- End of 5.1 tests
+--echo # ------------------------------------------------------------------
diff --git a/mysql-test/t/flush_read_lock_kill.test b/mysql-test/t/flush_read_lock_kill.test
index c3926d09205..c03f3be2534 100644
--- a/mysql-test/t/flush_read_lock_kill.test
+++ b/mysql-test/t/flush_read_lock_kill.test
@@ -14,6 +14,7 @@
 
 # Disable concurrent inserts to avoid test failures when reading the
 # connection id which was inserted into a table by another thread.
+set @old_concurrent_insert= @@global.concurrent_insert;
 set @@global.concurrent_insert= 0;
 
 connect (con1,localhost,root,,);
@@ -58,3 +59,7 @@ reap;
 
 connection con2;
 drop table t1;
+connection default;
+
+# Restore global concurrent_insert value
+set @@global.concurrent_insert= @old_concurrent_insert;
diff --git a/mysql-test/t/kill.test b/mysql-test/t/kill.test
index b7e1e82fe5d..8ef668f542b 100644
--- a/mysql-test/t/kill.test
+++ b/mysql-test/t/kill.test
@@ -8,6 +8,7 @@
 
 # Disable concurrent inserts to avoid test failures when reading the
 # connection id which was inserted into a table by another thread.
+set @old_concurrent_insert= @@global.concurrent_insert;
 set @@global.concurrent_insert= 0;
 
 connect (con1, localhost, root,,);
@@ -326,3 +327,9 @@ KILL CONNECTION_ID();
 --echo # of close of the connection socket
 --error 2013, 2006 
 SELECT 1;
+--connection default
+
+###########################################################################
+
+# Restore global concurrent_insert value. Keep in the end of the test file.
+set @@global.concurrent_insert= @old_concurrent_insert;
diff --git a/mysql-test/t/query_cache.test b/mysql-test/t/query_cache.test
index 771a32e8cd7..83fe1ab7d6e 100644
--- a/mysql-test/t/query_cache.test
+++ b/mysql-test/t/query_cache.test
@@ -1251,6 +1251,15 @@ disconnect user2;
 disconnect user3;
 
 #
+--echo #
+--echo # Bug#25132 disabled query cache: Qcache_free_blocks = 1
+--echo #
+set global query_cache_size=100000;
+set global query_cache_size=0;
+set global query_cache_type=0;
+show status like 'Qcache_free_blocks';
+
+--echo Restore default values.
 # Bug #28211 RENAME DATABASE and query cache don't play nicely together
 #
 # TODO: enable these tests when RENAME DATABASE is implemented.
diff --git a/mysql-test/t/sp_notembedded.test b/mysql-test/t/sp_notembedded.test
index 4e298b2076a..16ebb710f25 100644
--- a/mysql-test/t/sp_notembedded.test
+++ b/mysql-test/t/sp_notembedded.test
@@ -1,7 +1,9 @@
 # Can't test with embedded server
 -- source include/not_embedded.inc
+# Disable concurrent inserts to avoid test failures
+set @old_concurrent_insert= @@global.concurrent_insert;
+set @@global.concurrent_insert= 0;
 
---sleep 2
 --disable_warnings
 drop table if exists t1,t3;
 --enable_warnings
@@ -39,10 +41,14 @@ create procedure bug4902_2()
 begin
   show processlist;
 end|
---replace_column 1 # 6 # 3 localhost
+--disable_result_log
 call bug4902_2()|
---replace_column 1 # 6 # 3 localhost
+--enable_result_log
+show warnings|
+--disable_result_log
 call bug4902_2()|
+--enable_result_log
+show warnings|
 drop procedure bug4902_2|
 
 #
@@ -268,69 +274,72 @@ drop procedure 15298_1;
 drop procedure 15298_2;
 
 #
-# Test case disabled due to Bug#34891: sp_notembedded.test fails sporadically.
+# Bug#29936 Stored Procedure DML ignores low_priority_updates setting
 #
-# #
-# # Bug#29936 Stored Procedure DML ignores low_priority_updates setting
-# #
-#
-# --disable_warnings
-# drop table if exists t1;
-# drop procedure if exists p1;
-# --enable_warnings
-#
-# create table t1 (value varchar(15));
-# create procedure p1() update t1 set value='updated' where value='old';
-#
-# # load the procedure into sp cache and execute once
-# call p1();
-#
-# insert into t1 (value) values ("old");
-#
-# connect (rl_holder, localhost, root,,);
-# connect (rl_acquirer, localhost, root,,);
-# connect (rl_contender, localhost, root,,);
-# connect (rl_wait, localhost, root,,);
-#
-# connection rl_holder;
-# select get_lock('b26162',120);
-#
-# connection rl_acquirer;
-# --send select 'rl_acquirer', value from t1 where get_lock('b26162',120);
-#
-# # we must wait till this select opens and locks the tables
-# connection rl_wait;
-# let $wait_condition=
-#   select count(*) = 1 from information_schema.processlist
-#   where state = "User lock" and
-#   info = "select 'rl_acquirer', value from t1 where get_lock('b26162',120)";
-# --source include/wait_condition.inc
-#
-# connection default;
-# set session low_priority_updates=on;
-# --send call p1();
-#
-# connection rl_wait;
-# let $wait_condition=
-#   select count(*) = 1 from information_schema.processlist
-#   where state = "Locked" and
-#   info = "update t1 set value='updated' where value='old'";
-# --source include/wait_condition.inc
-#
-# connection rl_contender;
-# select 'rl_contender', value from t1;
-#
-# connection rl_holder;
-# select release_lock('b26162');
+
+--disable_warnings
+drop table if exists t1;
+drop procedure if exists p1;
+--enable_warnings
+
+create table t1 (value varchar(15));
+create procedure p1() update t1 set value='updated' where value='old';
+
+# load the procedure into sp cache and execute once
+call p1();
+
+insert into t1 (value) values ("old");
+
+connect (rl_holder, localhost, root,,);
+connect (rl_acquirer, localhost, root,,);
+connect (rl_contender, localhost, root,,);
+connect (rl_wait, localhost, root,,);
+
+connection rl_holder;
+select get_lock('b26162',120);
+
+connection rl_acquirer;
+--send select 'rl_acquirer', value from t1 where get_lock('b26162',120);
+
+# we must wait till this select opens and locks the tables
+connection rl_wait;
+let $wait_condition=
+  select count(*) = 1 from information_schema.processlist
+  where state = "User lock" and
+  info = "select 'rl_acquirer', value from t1 where get_lock('b26162',120)";
+--source include/wait_condition.inc
+
+connection default;
+set session low_priority_updates=on;
+--send call p1();
+
+connection rl_wait;
+let $wait_condition=
+  select count(*) = 1 from information_schema.processlist
+  where state = "Locked" and
+  info = "update t1 set value='updated' where value='old'";
+--source include/wait_condition.inc
+
+connection rl_contender;
+select 'rl_contender', value from t1;
+
+connection rl_holder;
+select release_lock('b26162');
+
+connection rl_acquirer;
+--reap
+connection default;
+--reap
+
+disconnect rl_holder;
+disconnect rl_acquirer;
+disconnect rl_wait;
+drop procedure p1;
+drop table t1;
+set session low_priority_updates=default;
+
 #
-# connection rl_acquirer;
-# --reap
-# connection default;
-# --reap
+# Restore global concurrent_insert value. Keep in the end of the test file.
 #
-# disconnect rl_holder;
-# disconnect rl_acquirer;
-# disconnect rl_wait;
-# drop procedure p1;
-# drop table t1;
-# set session low_priority_updates=default;
+
+set @@global.concurrent_insert= @old_concurrent_insert;
diff --git a/mysql-test/t/trigger-trans.test b/mysql-test/t/trigger-trans.test
index 8103a1ba0b1..5db5b982773 100644
--- a/mysql-test/t/trigger-trans.test
+++ b/mysql-test/t/trigger-trans.test
@@ -128,5 +128,37 @@ drop table t1, t2, t3;
 disconnect connection_update;
 disconnect connection_aux;
 
+#
+# Bug#34643: TRUNCATE crash if trigger and foreign key.
+#
+
+--disable_warnings
+DROP TABLE IF EXISTS t1;
+DROP TABLE IF EXISTS t2;
+--enable_warnings
+
+CREATE TABLE t1(a INT PRIMARY KEY) ENGINE=innodb;
+CREATE TABLE t2(b INT, FOREIGN KEY(b) REFERENCES t1(a)) ENGINE=innodb;
+
+INSERT INTO t1 VALUES (1);
+
+CREATE TRIGGER t1_bd BEFORE DELETE ON t1 FOR EACH ROW SET @a = 1;
+CREATE TRIGGER t1_ad AFTER DELETE ON t1 FOR EACH ROW SET @b = 1;
+
+SET @a = 0;
+SET @b = 0;
+
+TRUNCATE t1;
+
+SELECT @a, @b;
+
+INSERT INTO t1 VALUES (1);
+
+DELETE FROM t1;
+
+SELECT @a, @b;
+
+DROP TABLE t2, t1;
+
 
 --echo End of 5.0 tests
diff --git a/sql-common/client.c b/sql-common/client.c
index 596c9f6c448..63c746a3f5a 100644
--- a/sql-common/client.c
+++ b/sql-common/client.c
@@ -695,6 +695,16 @@ cli_safe_read(MYSQL *mysql)
 	strmake(net->sqlstate, pos+1, SQLSTATE_LENGTH);
 	pos+= SQLSTATE_LENGTH+1;
       }
+      else
+      {
+        /*
+          The SQL state hasn't been received -- it should be reset to HY000
+          (unknown error sql state).
+        */
+
+        strmov(net->sqlstate, unknown_sqlstate);
+      }
+
       (void) strmake(net->last_error,(char*) pos,
 		     min((uint) len,(uint) sizeof(net->last_error)-1));
     }
@@ -733,11 +743,12 @@ my_bool
 cli_advanced_command(MYSQL *mysql, enum enum_server_command command,
 		     const uchar *header, ulong header_length,
 		     const uchar *arg, ulong arg_length, my_bool skip_check,
-                     MYSQL_STMT *stmt __attribute__((unused)))
+                     MYSQL_STMT *stmt)
 {
   NET *net= &mysql->net;
   my_bool result= 1;
   init_sigpipe_variables
+  my_bool stmt_skip= stmt ? stmt->state != MYSQL_STMT_INIT_DONE : FALSE;
   DBUG_ENTER("cli_advanced_command");
 
   /* Don't give sigpipe errors if the client doesn't want them */
@@ -745,7 +756,7 @@ cli_advanced_command(MYSQL *mysql, enum enum_server_command command,
 
   if (mysql->net.vio == 0)
   {						/* Do reconnect if possible */
-    if (mysql_reconnect(mysql))
+    if (mysql_reconnect(mysql) || stmt_skip)
       DBUG_RETURN(1);
   }
   if (mysql->status != MYSQL_STATUS_READY ||
@@ -777,7 +788,7 @@ cli_advanced_command(MYSQL *mysql, enum enum_server_command command,
       goto end;
     }
     end_server(mysql);
-    if (mysql_reconnect(mysql))
+    if (mysql_reconnect(mysql) || stmt_skip)
       goto end;
     if (net_write_command(net,(uchar) command, header, header_length,
 			  arg, arg_length))
@@ -1911,7 +1922,13 @@ CLI_MYSQL_REAL_CONNECT(MYSQL *mysql,const char *host, const char *user,
 		  (int) have_tcpip));
       if (mysql->options.protocol == MYSQL_PROTOCOL_MEMORY)
 	goto error;
-      /* Try also with PIPE or TCP/IP */
+
+      /*
+        Try also with PIPE or TCP/IP. Clear the error from
+        create_shared_memory().
+      */
+
+      net_clear_error(net);
     }
     else
     {
@@ -2521,6 +2538,9 @@ my_bool mysql_reconnect(MYSQL *mysql)
       if (stmt->state != MYSQL_STMT_INIT_DONE)
       {
         stmt->mysql= 0;
+        stmt->last_errno= CR_SERVER_LOST;
+        strmov(stmt->last_error, ER(CR_SERVER_LOST));
+        strmov(stmt->sqlstate, unknown_sqlstate);
       }
       else
       {
diff --git a/sql/mysql_priv.h b/sql/mysql_priv.h
index 9bdf6e2a1d5..f035318c880 100644
--- a/sql/mysql_priv.h
+++ b/sql/mysql_priv.h
@@ -975,8 +975,6 @@ void time_out_user_resource_limits(THD *thd, USER_CONN *uc);
 void decrease_user_connections(USER_CONN *uc);
 void thd_init_client_charset(THD *thd, uint cs_number);
 bool setup_connection_thread_globals(THD *thd);
-bool login_connection(THD *thd);
-void end_connection(THD *thd);
 
 bool mysql_create_db(THD *thd, char *db, HA_CREATE_INFO *create, bool silent);
 bool mysql_alter_db(THD *thd, const char *db, HA_CREATE_INFO *create);
@@ -1897,6 +1895,7 @@ extern bool opt_disable_networking, opt_skip_show_db;
 extern my_bool opt_character_set_client_handshake;
 extern bool volatile abort_loop, shutdown_in_progress;
 extern uint volatile thread_count, thread_running, global_read_lock;
+extern uint connection_count;
 extern my_bool opt_sql_bin_update, opt_safe_user_create, opt_no_mix_types;
 extern my_bool opt_safe_show_db, opt_local_infile, opt_myisam_use_mmap;
 extern my_bool opt_slave_compressed_protocol, use_temp_pool;
@@ -1935,7 +1934,7 @@ extern pthread_mutex_t LOCK_mysql_create_db,LOCK_Acl,LOCK_open, LOCK_lock_db,
        LOCK_slave_list, LOCK_active_mi, LOCK_manager, LOCK_global_read_lock,
        LOCK_global_system_variables, LOCK_user_conn,
        LOCK_prepared_stmt_count,
-       LOCK_bytes_sent, LOCK_bytes_received;
+       LOCK_bytes_sent, LOCK_bytes_received, LOCK_connection_count;
 #ifdef HAVE_OPENSSL
 extern pthread_mutex_t LOCK_des_key_file;
 #endif
diff --git a/sql/mysqld.cc b/sql/mysqld.cc
index d329c6798a7..16c65f48708 100644
--- a/sql/mysqld.cc
+++ b/sql/mysqld.cc
@@ -585,7 +585,8 @@ pthread_mutex_t LOCK_mysql_create_db, LOCK_Acl, LOCK_open, LOCK_thread_count,
 		LOCK_delayed_insert, LOCK_delayed_status, LOCK_delayed_create,
 		LOCK_crypt, LOCK_bytes_sent, LOCK_bytes_received,
 	        LOCK_global_system_variables,
-		LOCK_user_conn, LOCK_slave_list, LOCK_active_mi;
+		LOCK_user_conn, LOCK_slave_list, LOCK_active_mi,
+                LOCK_connection_count;
 /**
   The below lock protects access to two global server variables:
   max_prepared_stmt_count and prepared_stmt_count. These variables
@@ -721,6 +722,11 @@ char *des_key_file;
 struct st_VioSSLFd *ssl_acceptor_fd;
 #endif /* HAVE_OPENSSL */
 
+/**
+  Number of currently active user connections. The variable is protected by
+  LOCK_connection_count.
+*/
+uint connection_count= 0;
 
 /* Function declarations */
 
@@ -1342,6 +1348,7 @@ static void clean_up_mutexes()
   (void) pthread_mutex_destroy(&LOCK_bytes_sent);
   (void) pthread_mutex_destroy(&LOCK_bytes_received);
   (void) pthread_mutex_destroy(&LOCK_user_conn);
+  (void) pthread_mutex_destroy(&LOCK_connection_count);
   Events::destroy_mutexes();
 #ifdef HAVE_OPENSSL
   (void) pthread_mutex_destroy(&LOCK_des_key_file);
@@ -1784,6 +1791,11 @@ void unlink_thd(THD *thd)
   DBUG_ENTER("unlink_thd");
   DBUG_PRINT("enter", ("thd: 0x%lx", (long) thd));
   thd->cleanup();
+
+  pthread_mutex_lock(&LOCK_connection_count);
+  --connection_count;
+  pthread_mutex_unlock(&LOCK_connection_count);
+
   (void) pthread_mutex_lock(&LOCK_thread_count);
   thread_count--;
   delete thd;
@@ -3452,6 +3464,7 @@ static int init_thread_environment()
   (void) pthread_mutex_init(&LOCK_global_read_lock, MY_MUTEX_INIT_FAST);
   (void) pthread_mutex_init(&LOCK_prepared_stmt_count, MY_MUTEX_INIT_FAST);
   (void) pthread_mutex_init(&LOCK_uuid_generator, MY_MUTEX_INIT_FAST);
+  (void) pthread_mutex_init(&LOCK_connection_count, MY_MUTEX_INIT_FAST);
 #ifdef HAVE_OPENSSL
   (void) pthread_mutex_init(&LOCK_des_key_file,MY_MUTEX_INIT_FAST);
 #ifndef HAVE_YASSL
@@ -4699,6 +4712,11 @@ void create_thread_to_handle_connection(THD *thd)
       thread_count--;
       thd->killed= THD::KILL_CONNECTION;			// Safety
       (void) pthread_mutex_unlock(&LOCK_thread_count);
+
+      pthread_mutex_lock(&LOCK_connection_count);
+      --connection_count;
+      pthread_mutex_unlock(&LOCK_connection_count);
+
       statistic_increment(aborted_connects,&LOCK_status);
       /* Can't use my_error() since store_globals has not been called. */
       my_snprintf(error_message_buff, sizeof(error_message_buff),
@@ -4738,15 +4756,34 @@ static void create_new_thread(THD *thd)
   if (protocol_version > 9)
     net->return_errno=1;
 
-  /* don't allow too many connections */
-  if (thread_count - delayed_insert_threads >= max_connections+1 || abort_loop)
+  /*
+    Don't allow too many connections. We roughly check here that we allow
+    only (max_connections + 1) connections.
+  */
+
+  pthread_mutex_lock(&LOCK_connection_count);
+
+  if (connection_count >= max_connections + 1 || abort_loop)
   {
+    pthread_mutex_unlock(&LOCK_connection_count);
+
     DBUG_PRINT("error",("Too many connections"));
     close_connection(thd, ER_CON_COUNT_ERROR, 1);
     delete thd;
     DBUG_VOID_RETURN;
   }
+
+  ++connection_count;
+
+  if (connection_count > max_used_connections)
+    max_used_connections= connection_count;
+
+  pthread_mutex_unlock(&LOCK_connection_count);
+
+  /* Start a new thread to handle connection. */
+
   pthread_mutex_lock(&LOCK_thread_count);
+
   /*
     The initialization of thread_id is done in create_embedded_thd() for
     the embedded library.
@@ -4754,13 +4791,10 @@ static void create_new_thread(THD *thd)
   */
   thd->thread_id= thd->variables.pseudo_thread_id= thread_id++;
 
-  /* Start a new thread to handle connection */
   thread_count++;
 
-  if (thread_count - delayed_insert_threads > max_used_connections)
-    max_used_connections= thread_count - delayed_insert_threads;
-
   thread_scheduler.add_connection(thd);
+
   DBUG_VOID_RETURN;
 }
 #endif /* EMBEDDED_LIBRARY */
diff --git a/sql/sql_cache.cc b/sql/sql_cache.cc
index ae6765c7934..388700f0efa 100644
--- a/sql/sql_cache.cc
+++ b/sql/sql_cache.cc
@@ -1998,6 +1998,7 @@ void Query_cache::make_disabled()
   query_cache_size= 0;
   queries_blocks= 0;
   free_memory= 0;
+  free_memory_blocks= 0;
   bins= 0;
   steps= 0;
   cache= 0;
diff --git a/sql/sql_class.cc b/sql/sql_class.cc
index 376102c8bf9..594577dd89c 100644
--- a/sql/sql_class.cc
+++ b/sql/sql_class.cc
@@ -395,8 +395,11 @@ Diagnostics_area::set_ok_status(THD *thd, ha_rows affected_rows_arg,
 {
   DBUG_ASSERT(! is_set());
 #ifdef DBUG_OFF
-  /* In production, refuse to overwrite an error with an OK packet. */
-  if (is_error())
+  /*
+    In production, refuse to overwrite an error or a custom response
+    with an OK packet.
+  */
+  if (is_error() || is_disabled())
     return;
 #endif
   /** Only allowed to report success if has not yet reported an error */
@@ -424,8 +427,11 @@ Diagnostics_area::set_eof_status(THD *thd)
 
   DBUG_ASSERT(! is_set());
 #ifdef DBUG_OFF
-  /* In production, refuse to overwrite an error with an EOF packet. */
-  if (is_error())
+  /*
+    In production, refuse to overwrite an error or a custom response
+    with an EOF packet.
+  */
+  if (is_error() || is_disabled())
     return;
 #endif
 
@@ -454,6 +460,14 @@ Diagnostics_area::set_error_status(THD *thd, uint sql_errno_arg,
     an error can happen during the flush.
   */
   DBUG_ASSERT(! is_set() || can_overwrite_status);
+#ifdef DBUG_OFF
+  /*
+    In production, refuse to overwrite a custom response with an
+    ERROR packet.
+  */
+  if (is_disabled())
+    return;
+#endif
 
   m_sql_errno= sql_errno_arg;
   strmake(m_message, message_arg, sizeof(m_message) - 1);
diff --git a/sql/sql_connect.cc b/sql/sql_connect.cc
index b22a33e3e92..6f8cd6494cd 100644
--- a/sql/sql_connect.cc
+++ b/sql/sql_connect.cc
@@ -402,10 +402,11 @@ check_user(THD *thd, enum enum_server_command command,
 
       if (check_count)
       {
-        VOID(pthread_mutex_lock(&LOCK_thread_count));
-        bool count_ok= thread_count <= max_connections + delayed_insert_threads
-                       || (thd->main_security_ctx.master_access & SUPER_ACL);
-        VOID(pthread_mutex_unlock(&LOCK_thread_count));
+        pthread_mutex_lock(&LOCK_connection_count);
+        bool count_ok= connection_count <= max_connections ||
+                       (thd->main_security_ctx.master_access & SUPER_ACL);
+        VOID(pthread_mutex_unlock(&LOCK_connection_count));
+
         if (!count_ok)
         {                                         // too many connections
           my_error(ER_CON_COUNT_ERROR, MYF(0));
@@ -930,7 +931,7 @@ bool setup_connection_thread_globals(THD *thd)
 */
 
 
-bool login_connection(THD *thd)
+static bool login_connection(THD *thd)
 {
   NET *net= &thd->net;
   int error;
@@ -968,7 +969,7 @@ bool login_connection(THD *thd)
     This mainly updates status variables
 */
 
-void end_connection(THD *thd)
+static void end_connection(THD *thd)
 {
   NET *net= &thd->net;
   plugin_thdvar_cleanup(thd);
diff --git a/sql/sql_delete.cc b/sql/sql_delete.cc
index 990f7713561..b9a7cd12662 100644
--- a/sql/sql_delete.cc
+++ b/sql/sql_delete.cc
@@ -45,6 +45,7 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
   bool		transactional_table, safe_update, const_cond;
   bool          const_cond_result;
   ha_rows	deleted= 0;
+  bool          triggers_applicable;
   uint usable_index= MAX_KEY;
   SELECT_LEX   *select_lex= &thd->lex->select_lex;
   THD::killed_state killed_status= THD::NOT_KILLED;
@@ -102,6 +103,7 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
     /* Error evaluating val_int(). */
     DBUG_RETURN(TRUE);
   }
+
   /*
     Test if the user wants to delete all rows and deletion doesn't have
     any side-effects (because of triggers), so we can use optimized
@@ -249,7 +251,13 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
 
   init_ftfuncs(thd, select_lex, 1);
   thd_proc_info(thd, "updating");
-  if (table->triggers && 
+
+  /* NOTE: TRUNCATE must not invoke triggers. */
+
+  triggers_applicable= table->triggers &&
+                       thd->lex->sql_command != SQLCOM_TRUNCATE;
+
+  if (triggers_applicable &&
       table->triggers->has_triggers(TRG_EVENT_DELETE,
                                     TRG_ACTION_AFTER))
   {
@@ -274,7 +282,7 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
     if (!(select && select->skip_record())&& ! thd->is_error() )
     {
 
-      if (table->triggers &&
+      if (triggers_applicable &&
           table->triggers->process_triggers(thd, TRG_EVENT_DELETE,
                                             TRG_ACTION_BEFORE, FALSE))
       {
@@ -285,7 +293,7 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
       if (!(error= table->file->ha_delete_row(table->record[0])))
       {
 	deleted++;
-        if (table->triggers &&
+        if (triggers_applicable &&
             table->triggers->process_triggers(thd, TRG_EVENT_DELETE,
                                               TRG_ACTION_AFTER, FALSE))
         {
diff --git a/sql/sql_prepare.cc b/sql/sql_prepare.cc
index a027ffe9daa..c922b21af90 100644
--- a/sql/sql_prepare.cc
+++ b/sql/sql_prepare.cc
@@ -2555,6 +2555,8 @@ void mysql_stmt_close(THD *thd, char *packet)
   Prepared_statement *stmt;
   DBUG_ENTER("mysql_stmt_close");
 
+  thd->main_da.disable_status();
+
   if (!(stmt= find_prepared_statement(thd, stmt_id, "mysql_stmt_close")))
     DBUG_VOID_RETURN;
 
@@ -2566,8 +2568,6 @@ void mysql_stmt_close(THD *thd, char *packet)
   (void) stmt->deallocate();
   general_log_print(thd, thd->command, NullS);
 
-  thd->main_da.disable_status();
-
   DBUG_VOID_RETURN;
 }
 
diff --git a/storage/ndb/src/kernel/blocks/tsman.cpp b/storage/ndb/src/kernel/blocks/tsman.cpp
index 8e68e118f98..ce5797cf209 100644
--- a/storage/ndb/src/kernel/blocks/tsman.cpp
+++ b/storage/ndb/src/kernel/blocks/tsman.cpp
@@ -181,7 +181,6 @@ struct TsmanChunk
   Vector<Uint32> bitmask;
 };
 template class Vector<TsmanChunk>;
-template class Vector<Uint32>;
 #endif
 
 void
diff --git a/tests/mysql_client_test.c b/tests/mysql_client_test.c
index 73f47825ae9..a50d9d74aaf 100644
--- a/tests/mysql_client_test.c
+++ b/tests/mysql_client_test.c
@@ -12016,6 +12016,7 @@ static void test_bug5194()
 
     rc= mysql_stmt_execute(stmt);
     check_execute(stmt, rc);
+    mysql_stmt_reset(stmt);
   }
 
   mysql_stmt_close(stmt);
@@ -16610,6 +16611,11 @@ static void test_bug27592()
   DBUG_VOID_RETURN;
 }
 
+
+/**
+  Bug#29948 autoreconnect + prepared statements + kill seems unstable
+*/
+
 static void test_bug29948()
 {
   MYSQL *dbc=NULL;
@@ -16622,7 +16628,10 @@ static void test_bug29948()
   const char *query;
   int buf;
   unsigned long length, cursor_type;
-  
+
+  DBUG_ENTER("test_bug29948");
+  myheader("test_bug29948");
+
   dbc = mysql_init(NULL);
   DIE_UNLESS(dbc);
 
@@ -16658,7 +16667,7 @@ static void test_bug29948()
   res= mysql_stmt_attr_set(stmt, STMT_ATTR_CURSOR_TYPE, (void *)&cursor_type);
   myquery(res);
 
-  query= "SELECT * from t1 where a=?";
+  query= "SELECT * FROM t1 WHERE a=?";
   res= mysql_stmt_prepare(stmt, query, strlen(query));
   myquery(res);
 
@@ -16670,16 +16679,20 @@ static void test_bug29948()
 
   res= mysql_stmt_bind_result(stmt,&bind);
   check_execute(stmt, res);
-    
-  sprintf(kill_buf, "kill %ld", dbc->thread_id);
-  mysql_query(dbc, kill_buf);
+
+  my_snprintf(kill_buf, sizeof(kill_buf), "KILL %ld", dbc->thread_id);
+  res= mysql_query(dbc, kill_buf);
+  myquery(res);
 
   res= mysql_stmt_store_result(stmt);
   DIE_UNLESS(res);
 
   mysql_stmt_free_result(stmt);
   mysql_stmt_close(stmt);
-  mysql_query(dbc, "DROP TABLE t1");
+
+  res= mysql_query(dbc, "DROP TABLE t1");
+  myquery(res);
+
   mysql_close(dbc);
 }