MariaDB版本字符串的第一部分是什么意思? [英] What does the first part of the MariaDB version string mean?

问题描述

如果我从PHP中检查数据库版本信息，MariaDB将在其版本字符串的开头返回一组额外的版本号.

If I inspect the DB version information from within PHP, MariaDB returns an extra set of version numbers at the front of its version string.

>>> DB::connection()->getPdo()->getAttribute(PDO::ATTR_SERVER_VERSION);
=> "5.5.5-10.2.20-MariaDB-1:10.2.20+maria~bionic"

5.5.5 代表什么?

推荐答案

MariaDB将主要版本号提高到10(2位)时，引入了版本前缀(即复制版本破解").

The version prefix (so called "replication version hack") was introduced when MariaDB bumped the major version number to 10 (2 digits).

这是必要的，因为复制协议期望使用1位数的主版本号，并且会以2位数的版本号中断.

This was necessary, since the replication protocol expects a 1-digit major version number and would break with a 2 digit version number.

版本5.5.5从未发布.

The version 5.5.5 was never released.

从Connector/C来源:

From Connector/C source:

#define MA_RPL_VERSION_HACK "5.5.5-"
...
mysql->server_version= strdup(end + sizeof(MA_RPL_VERSION_HACK) - 1);

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