The most successful scheme I've ever used on a project has combined backups and differential SQL files. Basically we would take a backup of our db after every release and do an SQL dump so that we could create a blank schema from scratch if we needed to as well. Then anytime you needed to make a change to the DB you would add an alter scrip to the sql directory under version control. We would always prefix a sequence number or date to the file name so the first change would be something like 01_add_created_on_column.sql, and the next script would be 02_added_customers_index. Our CI machine would check for these and run them sequentially on a fresh copy of the db that had been restored from the backup.

我们还准备了一些脚本，开发人员可以用一个命令将本地db重新初始化到当前版本。

You should never just log in and start entering "ALTER TABLE" commands to change a production database. The project I'm on has database on every customer site, and so every change to the database is made in two places, a dump file that is used to create a new database on a new customer site, and an update file that is run on every update which checks your current database version number against the highest number in the file, and updates your database in place. So for instance, the last couple of updates:

if [ $VERSION \< '8.0.108' ] ; then
  psql -U cosuser $dbName << EOF8.0.108
    BEGIN TRANSACTION;
    --
    -- Remove foreign key that shouldn't have been there.
    -- PCR:35665
    --
    ALTER TABLE     migratorjobitems
    DROP CONSTRAINT migratorjobitems_destcmaid_fkey;
    -- 
    -- Increment the version
    UPDATE          sys_info
    SET             value = '8.0.108'
    WHERE           key = 'DB VERSION';
    END TRANSACTION;
EOF8.0.108
fi

if [ $VERSION \< '8.0.109' ] ; then
  psql -U cosuser $dbName << EOF8.0.109
    BEGIN TRANSACTION;
    --
    -- I missed a couple of cases when I changed the legacy playlist
    -- from reporting showplaylistidnum to playlistidnum
    --
    ALTER TABLE     featureidrequestkdcs
    DROP CONSTRAINT featureidrequestkdcs_cosfeatureid_fkey;
    ALTER TABLE     featureidrequestkdcs
    ADD CONSTRAINT  featureidrequestkdcs_cosfeatureid_fkey
    FOREIGN KEY     (cosfeatureid)
    REFERENCES      playlist(playlistidnum)
    ON DELETE       CASCADE;
    --
    ALTER TABLE     ticket_system_ids
    DROP CONSTRAINT ticket_system_ids_showplaylistidnum_fkey;
    ALTER TABLE     ticket_system_ids
    RENAME          showplaylistidnum
    TO              playlistidnum;
    ALTER TABLE     ticket_system_ids
    ADD CONSTRAINT  ticket_system_ids_playlistidnum_fkey
    FOREIGN KEY     (playlistidnum)
    REFERENCES      playlist(playlistidnum)
    ON DELETE       CASCADE;
    -- 
    -- Increment the version
    UPDATE          sys_info
    SET             value = '8.0.109'
    WHERE           key = 'DB VERSION';
    END TRANSACTION;
EOF8.0.109
fi

我相信有更好的方法来做到这一点，但到目前为止，它对我来说是有效的。

我们正在将所有数据库转移到源代码控制的过程中。我们使用sqlcompare脚本输出数据库(不幸的是，这是一个专业版的特性)，并将结果放到SVN中。

实施的成功将在很大程度上取决于组织的文化和实践。这里的人相信为每个应用程序创建一个数据库。大多数应用程序都使用一组通用的数据库，这也导致了大量的数据库间依赖关系(其中一些是循环的)。由于我们的系统具有数据库间的依赖关系，将数据库模式放到源代码控制中是非常困难的。

祝你好运，你越早尝试，你的问题就会越早解决。

Sadly, I've seen more than one team developing PL/SQL programs (stored procedures in Oracle) - sometimes ten thousands LOC - just by editing the code in TOAD (a database tool), without even saving the source to files (except for deployment). Even if the database is backuped regulary (wouldn't take that for granted, though), the only way to retrieve an old version of a stored procedure is to restore the whole database, which is many GB large. And of course sometimes concurrent changes in one file lead to loss of work, when more than one developer works on the same project.

我对创建脚本进行了版本控制，并在其中使用了svn版本标记。然后，每当我得到一个将要使用的版本时，我就在dbpatches/目录中创建一个脚本，命名为要上卷到的版本。该脚本的任务是在不破坏数据的情况下修改当前数据库。例如，Dbpatches /可能有名为201、220和240的文件。如果数据库当前处于201级别，则应用补丁220，然后再应用补丁240。

DROP TABLE IF EXISTS `meta`;
CREATE TABLE `meta` (
  `property` varchar(255),
  `value` varchar(255),
  PRIMARY KEY (`property`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO `meta` VALUES ('version', '$Rev: 240 $');

在考虑一个好的补丁之前，不要忘记测试你的代码。购者自慎!

我使用ActiveRecord Migrations。这个Ruby gem可以在Rails项目之外使用，并且有适配器可以处理您遇到的大多数数据库。我的建议:如果你能够在Postgres上运行你的项目，你就会得到事务性的模式迁移。这意味着如果迁移只应用了一半，您不会最终得到一个损坏的数据库。