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support 'parallel' updates and rallback of whole statement in case of error in evalueting value which should be assigned

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(BUG#1484)


mysql-test/r/variables.result:
  test of swaping variables
mysql-test/t/variables.test:
  test of swaping variables
sql/item_func.cc:
  new method of user variables to pre-fetch value
sql/item_func.h:
  new method of user variables to pre-fetch value
sql/set_var.cc:
  check() methods fetch & store value
sql/set_var.h:
  check() methods fetch & store value
This commit is contained in:
unknown
2003-10-24 17:28:32 +03:00
parent 5ee2807c49
commit ce2c46ddd6
6 changed files with 136 additions and 59 deletions
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17
mysql-test/t/variables.test
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@ -263,3 +263,20 @@ drop table t1,t2;
--error 1193
select @@xxxxxxxxxx;
select 1;
#
# swap
#
select @@global.max_user_connections,@@local.max_join_size;
set @svc=@@global.max_user_connections, @svj=@@local.max_join_size;
select @@global.max_user_connections,@@local.max_join_size;
set @@global.max_user_connections=111,@@local.max_join_size=222;
select @@global.max_user_connections,@@local.max_join_size;
set @@global.max_user_connections=@@local.max_join_size,@@local.max_join_size=@@global.max_user_connections;
select @@global.max_user_connections,@@local.max_join_size;
set @@global.max_user_connections=@svc, @@local.max_join_size=@svj;
select @@global.max_user_connections,@@local.max_join_size;
set @a=1, @b=2;
set @a=@b, @b=@a;
select @a, @b;