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Bug#4118: multi-table UPDATE takes WRITE lock on read table

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Ensures that WRITE lock is not obtained on all tables referenced.
This commit is contained in:
antony@ltantony.rdg.cyberkinetica.homeunix.net
2004-10-03 00:20:47 +01:00
parent 5cf8e9d769
commit 2973a047ea
7 changed files with 155 additions and 33 deletions
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12
mysql-test/r/lock_multi.result
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@@ -17,6 +17,18 @@ unlock tables;
n
1
drop table t1;
create table t1 (a int, b int);
create table t2 (c int, d int);
insert into t1 values(1,1);
insert into t1 values(2,2);
insert into t2 values(1,2);
lock table t1 read;
update t1,t2 set c=a where b=d;
select c from t2;
c
2
drop table t1;
drop table t2;
create table t1 (a int);
create table t2 (a int);
lock table t1 write, t2 write;