Hi,
You can actually unpack them using some fairly cryptic stuff. I would
only use this to unpack them once to re-store them as INT. Here's an
example:
CREATE TABLE ip (packed CHAR(4));
INSERT INTO ip (packed) VALUES (0xB16212C);
mysql> SELECT * FROM ip;
+--------+
| packed |
+--------+
|
!, |
+--------+
1 row in set (0.00 sec)
mysql> SELECT
-> INET_NTOA(
-> (ord(substring(packed, 1, 1)) << 24) +
-> (ord(substring(packed, 2, 2)) << 16) +
-> (ord(substring(packed, 3, 3)) << 8) +
-> (ord(substring(packed, 4, 4)))
-> ) AS unpacked
-> FROM ip;
+-------------+
| unpacked |
+-------------+
| 11.22.33.44 |
+-------------+
1 row in set (0.00 sec)
Regards,
Jeremy
Baron Schwartz wrote:
I think Gerald was suggesting you convert the IP's into integers and
then do bitwise stuff on them. I don't know of a way to do what you're
asking.
Baron
Wagner, Chris (GEAE, CBTS) wrote:
Those functions concern dotted quad IP addresses, not packed binaries.
Anybody know of some obscure MySQL functions to do bit logic on strings
or get MySQL to recognize a char sequence as an integer?
"Gerald L. Clark" wrote:
Wagner, Chris (GEAE, CBTS) wrote:
Hi. I've got IP addresses stored in the database as packed binaries.
i.e. binary(4). I put them in there that way so that I could do bitwise
logic on them to do subnet searches. e.g. ...WHERE `ip` & 'mask' =
'network'. Only it turns out that as far as I can tell MySQL can't do
bit logic on strings, only integers. I came up with an onerous SQL call
that eats the 4 bytes and makes an integer out of them but there's got
to be a better way. The worst case is that I redo the database to have
all the IP's as integers.
Anybody know of a way to make MySQL either do the bit logic on the
string or convert/cast the string as an integer? Thanks.
Try INET_ATON() and INET_NTOA().
--
Gerald L. Clark
Supplier Systems Corporation
--
high performance mysql consulting
www.provenscaling.com
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