MySQL database versions when the code base does not have ORM

Question

I thought about this problem for a while and have not yet come up with any stable / elegant ideas.

I know that with MyISAM tables you can get the def table update time, but this is not true in InnoDB, and I found that it is not even reliable to look at the .frm file to understand when the definition could be changed .... will never change if the dataset has been changed.

I had an idea every 30 minutes mysqld to roll the contents of a schema, breaking it into an AWK script and then distinguishing it from the latest version ... but this seems a bit overkill and can be a problem if the data set is large.

Answer 1

: ? , , ...

http://odetocode.com/Blogs/scott/archive/2008/01/30/11702.aspx

, , ORM, . .

Answer 2

mysqldump -d, :

[gary.richardson@server ~]$ mysqldump -d -u root mysql user
-- MySQL dump 10.11
--
-- Host: localhost    Database: mysql
-- ------------------------------------------------------
-- Server version       5.0.45

/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;
/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;
/*!40103 SET TIME_ZONE='+00:00' */;
/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;

--
-- Table structure for table `user`
--

DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
  `Host` char(60) collate utf8_bin NOT NULL default '',
  `User` char(16) collate utf8_bin NOT NULL default '',
  `Password` char(41) character set latin1 collate latin1_bin NOT NULL default '',
  `Select_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `Insert_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `Update_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `Delete_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `Create_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `Drop_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `Reload_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `Shutdown_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `Process_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `File_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `Grant_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `References_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `Index_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `Alter_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `Show_db_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `Super_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `Create_tmp_table_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `Lock_tables_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `Execute_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `Repl_slave_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `Repl_client_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `Create_view_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `Show_view_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `Create_routine_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `Alter_routine_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `Create_user_priv` enum('N','Y') character set utf8 NOT NULL default 'N',
  `ssl_type` enum('','ANY','X509','SPECIFIED') character set utf8 NOT NULL default '',
  `ssl_cipher` blob NOT NULL,
  `x509_issuer` blob NOT NULL,
  `x509_subject` blob NOT NULL,
  `max_questions` int(11) unsigned NOT NULL default '0',
  `max_updates` int(11) unsigned NOT NULL default '0',
  `max_connections` int(11) unsigned NOT NULL default '0',
  `max_user_connections` int(11) unsigned NOT NULL default '0',
  PRIMARY KEY  (`Host`,`User`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='Users and global privileges';
/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;

/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

-- Dump completed on 2008-10-02 20:06:38

.

, . COMMENT :

CREATE TABLE example (
  name varchar(32) COMMENT='Name of a person'
) COMMENT='example table';

. RCS:

CREATE TABLE example (
  name varchar(32) COMMENT='Name of a person'
) COMMENT='VERSION=1.2.3 example table';

Answer 3

, . innodb. /, VC.