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Fix for bug #9486 "Can't perform multi-update in stored procedure".

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New more SP-locking friendly approach to handling locks in multi-update.
Now we mark all tables of multi-update as needing write lock at parsing
stage and if possible downgrade lock at execution stage (For its work
SP-locking mechanism needs to know all lock types right after parsing
stage).
This commit is contained in:
dlenev@brandersnatch.localdomain
2005-04-15 20:31:47 +04:00
parent 32221d9b9e
commit 6b0b4734d9
7 changed files with 73 additions and 25 deletions
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17
mysql-test/r/sp-threads.result
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@ -23,3 +23,20 @@ select * from t1;
s1 s2 s3
drop table t1;
drop procedure bug4934;
drop procedure if exists bug9486;
drop table if exists t1, t2;
create table t1 (id1 int, val int);
create table t2 (id2 int);
create procedure bug9486()
update t1, t2 set val= 1 where id1=id2;
call bug9486();
lock tables t2 write;
call bug9486();
show processlist;
Id User Host db Command Time State Info
# root localhost test Sleep # NULL
# root localhost test Query # Locked call bug9486()
# root localhost test Query # NULL show processlist
unlock tables;
drop procedure bug9486;
drop table t1, t2;