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Auto-merge from mysql-trunk-bugfixing.

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******
This patch fixes the following bugs:
  - Bug#5889: Exit handler for a warning doesn't hide the warning in
    trigger
  - Bug#9857: Stored procedures: handler for sqlwarning ignored
  - Bug#23032: Handlers declared in a SP do not handle warnings generated
    in sub-SP
  - Bug#36185: Incorrect precedence for warning and exception handlers

The problem was in the way warnings/errors during stored routine execution
were handled. Prior to this patch the logic was as follows:

  - when a warning/an error happens: if we're executing a stored routine,
    and there is a handler for that warning/error, remember the handler,
    ignore the warning/error and continue execution.

  - after a stored routine instruction is executed: check for a remembered
    handler and activate one (if any).

This logic caused several problems:

  - if one instruction generates several warnings (errors) it's impossible
    to choose the right handler -- a handler for the first generated
    condition was chosen and remembered for activation.

  - mess with handling conditions in scopes different from the current one.

  - not putting generated warnings/errors into Warning Info (Diagnostic
    Area) is against The Standard.

The patch changes the logic as follows:

  - Diagnostic Area is cleared on the beginning of each statement that
    either is able to generate warnings, or is able to work with tables.

  - at the end of a stored routine instruction, Diagnostic Area is left
    intact.

  - Diagnostic Area is checked after each stored routine instruction. If
    an instruction generates several condition, it's now possible to take a
    look at all of them and determine an appropriate handler.
This commit is contained in:
Alexander Nozdrin
2010-07-30 19:28:36 +04:00
parent 02a0787d8d
commit b2f8005094
30 changed files with 1385 additions and 344 deletions
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57
mysql-test/r/sp-code.result
View File

@ -711,6 +711,8 @@ looping i
looping 1
looping i
looping 0
Warnings:
Error 1062 Duplicate entry '1' for key 'a'
call proc_26977_works(2);
do something
do something
@ -730,6 +732,8 @@ looping i
looping 0
optimizer: keep hreturn
optimizer: keep hreturn
Warnings:
Error 1062 Duplicate entry '2' for key 'a'
drop table t1;
drop procedure proc_26977_broken;
drop procedure proc_26977_works;
@ -888,3 +892,56 @@ Pos Instruction
4 jump 6
5 error 1339
DROP PROCEDURE p1;
#
# Bug#23032: Handlers declared in a SP do not handle warnings generated in sub-SP
#
# - Case 4: check that "No Data trumps Warning".
CREATE TABLE t1(a INT);
INSERT INTO t1 VALUES (1), (2), (3);
CREATE PROCEDURE p1()
BEGIN
DECLARE c CURSOR FOR SELECT a FROM t1;
OPEN c;
BEGIN
DECLARE v INT;
DECLARE CONTINUE HANDLER FOR SQLWARNING
BEGIN
SELECT "Warning found!";
SHOW WARNINGS;
END;
DECLARE EXIT HANDLER FOR NOT FOUND
BEGIN
SELECT "End of Result Set found!";
SHOW WARNINGS;
END;
WHILE TRUE DO
FETCH c INTO v;
END WHILE;
END;
CLOSE c;
SELECT a INTO @foo FROM t1 LIMIT 1; # Clear warning stack
END|
SET SESSION debug="+d,bug23032_emit_warning";
CALL p1();
Warning found!
Warning found!
Level Code Message
Warning 1105 Unknown error
Warning found!
Warning found!
Level Code Message
Warning 1105 Unknown error
Warning found!
Warning found!
Level Code Message
Warning 1105 Unknown error
End of Result Set found!
End of Result Set found!
Level Code Message
Warning 1105 Unknown error
Error 1329 No data - zero rows fetched, selected, or processed
SET SESSION debug="-d,bug23032_emit_warning";
DROP PROCEDURE p1;
DROP TABLE t1;