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Bug#44521 Executing a stored procedure as a prepared statement can sometimes cause

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an assertion in a debug build.

The reason is that the C API doesn't support multiple result sets for prepared
statements and attempting to execute a stored routine which returns multiple result
sets sometimes lead to a network error. The network error sets the diagnostic area
prematurely which later leads to the assert when an attempt is made to set a second
server state.

This patch fixes the issue by changing the scope of the error code returned by
sp_instr_stmt::execute() to include any error which happened during the execution.
To assure that Diagnostic_area::is_sent really mean that the message was sent all
network related functions are checked for return status.

libmysqld/lib_sql.cc:
  * Changed prototype to return success/failure status on net_send_error_packet(),
    net_send_ok(), net_send_eof(), write_eof_packet().
mysql-test/r/sp_notembedded.result:
  * Added test case for bug 44521
mysql-test/t/sp_notembedded.test:
  * Added test case for bug 44521
sql/protocol.cc:
  * Changed prototype to return success/failure status on net_send_error_packet(),
    net_send_ok(), net_send_eof(), write_eof_packet().
sql/protocol.h:
  * Changed prototype to return success/failure status on net_send_error_packet(),
    net_send_ok(), net_send_eof(), write_eof_packet().
sql/sp_head.cc:
  * Changed prototype to return success/failure status on net_send_error_packet(),
    net_send_ok(), net_send_eof(), write_eof_packet().
This commit is contained in:
Kristofer Pettersson
2009-07-29 22:07:08 +02:00
parent 1df8ad6c14
commit fc1acef6b2
6 changed files with 172 additions and 56 deletions
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22
mysql-test/r/sp_notembedded.result
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@ -249,3 +249,25 @@ DROP PROCEDURE p1;
DELETE FROM mysql.user WHERE User='mysqltest_1';
FLUSH PRIVILEGES;
set @@global.concurrent_insert= @old_concurrent_insert;
#
# Bug#44521 Prepared Statement: CALL p() - crashes: `! thd->main_da.is_sent' failed et.al.
#
SELECT GET_LOCK('Bug44521', 0);
GET_LOCK('Bug44521', 0)
1
** Connection con1
CREATE PROCEDURE p()
BEGIN
SELECT 1;
SELECT GET_LOCK('Bug44521', 100);
SELECT 2;
END$
CALL p();;
** Default connection
SELECT RELEASE_LOCK('Bug44521');
RELEASE_LOCK('Bug44521')
1
DROP PROCEDURE p;
# ------------------------------------------------------------------
# -- End of 5.1 tests
# ------------------------------------------------------------------