Thanks for the info. I am using 4.0.24, so maybe this is the problem.
I was able to get around this by first checking if the mac field was
empty, but I will look into upgrading mysql to a more current version.
thanks
- Original Message -
From: [EMAIL PROTECTED]
Date: Monday, April 25, 2005 9:26 am
Subject: Re: problem with update statement
Hi,
this is an example where what you describe doesn't happen (v 4.1
and 5.0) :
mysql create table ports(mac varchar(17),port_index varchar(3));
Query OK, 0 rows affected (0.10 sec)
mysql insert into ports
values('00:04:FB:23:5A:44','120'),(NULL,'120');Query OK, 2 rows
affected (0.08 sec)
Records: 2 Duplicates: 0 Warnings: 0
mysql select * from ports;
+---++
| mac | port_index |
+---++
| 00:04:FB:23:5A:44 | 120|
| NULL | 120|
+---++
2 rows in set (0.00 sec)
mysql select * from ports where mac='00:04:FB:23:5A:44';
+---++
| mac | port_index |
+---++
| 00:04:FB:23:5A:44 | 120|
+---++
1 row in set (0.00 sec)
mysql
mysql update ports set port_index='123' where
mac='00:04:FB:23:5A:44';Query OK, 1 row affected (0.41 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql select * from ports;
+---++
| mac | port_index |
+---++
| 00:04:FB:23:5A:44 | 123|
| NULL | 120|
+---++
2 rows in set (0.00 sec)
mysql
if you use an old version which is buggy, just migrate.
Mathias
Selon Brent Baisley [EMAIL PROTECTED]:
That is very odd behavior and shouldn't be happening. I ran a quick
test on my machine and MySQL does not exhibit that behavior. You
may
try running and repair on your table. Perhaps something is out of
whack. What version of MySQL are you running?
On Apr 22, 2005, at 6:08 PM, [EMAIL PROTECTED] wrote:
Hello, all:
In a MyISAM table, I have a column named MAC, of type
VARCHAR(17). This field is used to hold MAC addresses of
computers' network
interface cards. These MAC addresses are in the
form XX:XX:XX:XX:XX:XX, where X can be either a number or an
uppercase letter. I can run select * from table where
MAC='00:04:FB:23:5A:44' and the correct record is returned.
However, performing update table set port_index='123' where
MAC='00:04:FB:23:5A:44' does not work as I expected. It does
update the correct record, but also updates all other records
whose MAC field
is empty. When I originally created this field, I used type
VARCHAR (17), null, default value NULL. In troubleshooting
this, I have since
change the type to CHAR(17), not null, empty default value.
Still
have the same problem. Does anyone know what's going on here,
and how
I could correct this?
Thanks!
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Brent Baisley
Systems Architect
Landover Associates, Inc.
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p: 212.759.6400/800.759.0577
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