Ferreteria/sql/user client: Difference between revisions
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m (Woozle moved page VbzCart/tables/user client to Ferreteria/sql/user client: has been a ferreteria table for awhile, actually) |
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* '''Notes''': | * '''Notes''': | ||
** For identifying the user, decided to use [[CRC32]] instead of compression because the compressed strings always came out at least as long as the original string. They were probably designed to be effective for rather longer data. | ** For identifying the user, decided to use [[CRC32]] instead of compression because the compressed strings always came out at least as long as the original string. They were probably designed to be effective for rather longer data. | ||
==History== | |||
* '''2009-06-16''' Changing name to singular | |||
* '''2009-09-11''' CRC comes out negative sometimes, so making this SIGNED | |||
* '''2013-11-09''' Renamed from '''shop_client''' to '''user_client''' | |||
* '''2014-09-18''' ''Really'' renamed '''user_client'''; removed unwanted DROP TABLE statement. | |||
* '''2015-06-08''' Changed CRC back to UNSIGNED, because otherwise it refuses to add large values | |||
** [http://php.net/manual/en/function.crc32.php crc32()] can return negative numbers on 32-bit systems, but not on 64-bit. | |||
** Use [http://php.net/manual/en/function.sprintf.php sprintf('%u',$CRC)] to ensure unsigned string for SQL insertion. | |||
** For converting this field from signed to unsigned: so far, I haven't worked out any better method than deleting all the data first (otherwise you get errors). I also deleted everything in {{l/same|user_session}}, since it points here. | |||
* '''2017-01-26''' moved to Ferreteria; changed from MYISAM to INNODB | |||
==SQL== | ==SQL== | ||
<mysql>CREATE TABLE `user_client` ( | <mysql>CREATE TABLE `user_client` ( | ||
| Line 25: | Line 26: | ||
PRIMARY KEY(`ID`), | PRIMARY KEY(`ID`), | ||
UNIQUE KEY(`CRC`) | UNIQUE KEY(`CRC`) | ||
) ENGINE = | ) ENGINE = INNODB;</mysql> | ||
Revision as of 00:32, 27 January 2017
About
- Status: working / tested / debugged
- Fields
- CRC: checksum uniquely identifying user's IP address and browser client software. See notes.
- Notes:
- For identifying the user, decided to use CRC32 instead of compression because the compressed strings always came out at least as long as the original string. They were probably designed to be effective for rather longer data.
History
- 2009-06-16 Changing name to singular
- 2009-09-11 CRC comes out negative sometimes, so making this SIGNED
- 2013-11-09 Renamed from shop_client to user_client
- 2014-09-18 Really renamed user_client; removed unwanted DROP TABLE statement.
- 2015-06-08 Changed CRC back to UNSIGNED, because otherwise it refuses to add large values
- crc32() can return negative numbers on 32-bit systems, but not on 64-bit.
- Use sprintf('%u',$CRC) to ensure unsigned string for SQL insertion.
- For converting this field from signed to unsigned: so far, I haven't worked out any better method than deleting all the data first (otherwise you get errors). I also deleted everything in user_session, since it points here.
- 2017-01-26 moved to Ferreteria; changed from MYISAM to INNODB
SQL
<mysql>CREATE TABLE `user_client` (
`ID` INT NOT NULL AUTO_INCREMENT, `CRC` INT UNSIGNED NOT NULL COMMENT "crc32(Address+Browser) - unique integer defined by client specs", `Address` VARCHAR(15) NOT NULL COMMENT "IP address of client", `Domain` VARCHAR(255) COMMENT "Domain name of client", `Browser` VARCHAR(255) COMMENT "Browser USER_AGENT string", `WhenFirst` DATETIME NOT NULL COMMENT "When this client was first seen", `WhenFinal` DATETIME COMMENT "When this client was most recently seen", PRIMARY KEY(`ID`), UNIQUE KEY(`CRC`) ) ENGINE = INNODB;</mysql>