Excuse me for late response.
When I do it from the mysql prompt it works fine but trough the API (I use
DAC for MySQL from microolap, maybe the bug is in there software!!) it
doesn't work fine.
I have try it on several versions: 4.1.1, 5.0.0 and 4.0.0.
Thank you for your help. If you think it is not a database bug or a API
bug I contact microolap for more support.
hans
At 19:38 8-3-04, you wrote:
Hans van Dalen <[EMAIL PROTECTED]> wrote:
>
> A question about locking. In my code (delphi but that doesn't much
matter)
> I fire ad-hoc queries (select). Before the query i fire a locking query
> (read) for that particular tables. Something like this:
>
> lock tables tab1 a read, tab2 b read
> (execute)
> select * from tab1 a, tab2 b where.........
> (execute)
>
> In this case I get an error: tab1 is not locked using LOCK TABLES.
Works fine for me:
mysql> lock tables tab1 a read, tab2 b read;
Query OK, 0 rows affected (0.00 sec)
mysql> select * from tab1 a, tab2 b where a.id=b.id;
+------+------+
| id | id |
+------+------+
| 2 | 2 |
+------+------+
1 row in set (0.00 sec)
What exactly versions do you use?
> If I change the locking query to: lock tables tab1 read, tab2 b read
> The first times I didn't get any error. But after some times of
running my
> app the error: a is not locked using LOCK TABLES occur!?!?
>
> Ok finally I use the statement: lock tables tab1 read, tab1 a read,
tab2 b
> read
> en everything works fine.
>
> The strangest thing about this is that sometimes it doesn't go wrong
> (locking using the lock statement with only the table aliases), other
times
> it goes.
>
> When I execute the locking and the select query from my SQL explorer
> (borland) nothing is going wrong (makes no sense whatever you lock).
>
> It makes no difference I use version 4.0/4.1/5.0 (on suse linux).
>
> Anybody who has seen this before?????
>
> Okay the workaround is simple: don't use table aliases or use the above
> showed locking statement, but it makes me angry something like this
errors
> are raised on unexpected moments in my production environment,.
>
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