Re: emergency help

2001-06-04 Thread Luca Accomazzi

> I got the message:
> 
> [root@mothra /tmp]# safe_mysqld &
> 
> [1] 3922
> 
> [root@mothra /tmp]# Starting mysqld daemon with databases from
> /usr/local/var 
> mysqld daemon ended
> 

Are your databases in there? If you do a

ll /usr/local/var 

Do you see a directory for each database of yours, with the same names?

L.A.


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Re: emergency help

2001-06-04 Thread Luca Accomazzi

>  Last Saturday when I rebooted Red Hat
> Linux, mysql database server didn't come back any more.

Try typing this on the command line:

safe_mysqld &

Then tell us what happens. :-)

L.A.


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Re: Help! MySQL variables laugh at me

2001-06-04 Thread Luca Accomazzi

> I have only had a quick look over this and already have a question for the
> simple example you've provided.  How are you determining the last value
> entered before entering the new value?  The only way I see you of
> effectively accomplishing this is through the use of a datetime column.  Or
> am I missing something?

Wait wait wait! I see what you mean. What I'm seeing as a loop (rows upon
rows of data from the database) is a single query to MySQL. So it's fist
selecting, then calculating my variable, then sorting. And in sorting, I see
"wrong" values for my "is different from the previous" pseudo field.

Glact.

Is there anything I can do to get the functionality I'm after in any other
way? I seem to remember there's a "having" clause which gets computed in the
end?

L.A.


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FW: Help! MySQL variables laugh at me

2001-06-04 Thread Luca Accomazzi

> I have only had a quick look over this and already have a question for the
> simple example you've provided.  How are you determining the last value
> entered before entering the new value?  The only way I see you of
> effectively accomplishing this is through the use of a datetime column.  Or
> am I missing something?

I don't understand perfectly your question.
Do you mean "how do I keep records in order" or "how do I keep track of the
previous record's field value in the SELECTing query"?

"how do I keep records in order"

In the simple example, I don't. I don't care what order the records come
out, it's just an example database. :-)
In the complex (real-life) example there is an ORDER BY clause.

"how do I keep track of the previous record's field value when SELECTing"

I use a variable called @oldOrdine. The last thing I do in the SELECT is
stuffing in there the value of the record for the current field. Then, on
the subsequent record iteration, I compare its current value with the
then-current field value.

L.A.

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Help! MySQL variables laugh at me

2001-06-04 Thread Luca Accomazzi
1 | Very Thin | 1  |
| 1|  3 |  3 |1 | Very Thin | 1  |
| 1|  3 |  3 |1 | Very Thin | 1  |
| 1|  3 |  3 |1 | Very Thin | 1  |
| 1|  3 |  3 |1 | Very Thin | 1  |
+--+++--+---++
13 rows in set (0.09 sec)

Looks like a nasty bug to me (by the way, I'm running v3.23.28), but maybe
I'm just dumb? And of course the deadline is looming, etc.

What can I do? Please note that I will gladly accept a workaround, but
everything must be done inside a single MySQL query. (Which will later get
processed by a big, nasty PHP program which will do unwholesome things on it
and which I can not touch).

Thanks in advance.

Luca Accomazzi


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