我试图将我的 UTF8 MySQL 5.5.30 数据库转换为 UTF8MB4。我看过这篇文章https://mathiasbynens.be/notes/mysql-utf8mb4但有一些问题。
我做了这些
ALTER DATABASE database_name CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci;
ALTER TABLE table_name CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
最后一个是用 62 个表手动完成的,其中一个给了我这个警告
13:08:30 ALTER TABLE bradspelold.games CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci 101289 行受影响,2 个警告:1071 指定的密钥太长;最大密钥长度为 767 字节 1071 指定的密钥太长;最大密钥长度为 767 字节记录:101289 重复:0 警告:2 3.016 秒
- 这是一个问题吗?我能做些什么来解决它?
下一步是
ALTER TABLE table_name CHANGE column_name column_name
VARCHAR(191) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
- 我不确定命令,为什么有 2 个 column_name?
- 我应该只在 VARCHAR(191) 列上执行此操作吗?我不认为我有他们中的任何一个?
- 你知道更多这样的文章来解释更多的身份细节为什么和如何?
编辑 :
桌上表演游戏
CREATE TABLE `games` (
`id` int(10) unsigned NOT NULL DEFAULT \'0\',
`name` varchar(255) NOT NULL,
`description` mediumtext,
`yearPublished` datetime NOT NULL,
`minPlayers` int(10) unsigned NOT NULL,
`maxPlayers` int(10) unsigned NOT NULL,
`playingTime` varchar(127) NOT NULL,
`grade` double NOT NULL DEFAULT \'0\',
`updated` datetime NOT NULL,
`forumParentId` int(10) unsigned DEFAULT \'0\',
`lastVisited` datetime DEFAULT NULL,
`inactivatedDate` datetime DEFAULT NULL,
`bggGrade` double DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `inactivatedDate` (`inactivatedDate`),
KEY `name` (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8'
编辑2:
'CREATE TABLE `forum_threads` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`title` varchar(150) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '''',
`description` varchar(150) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '''',
`createdDate` datetime NOT NULL DEFAULT ''0000-00-00 00:00:00'',
`createrId` int(10) unsigned DEFAULT NULL,
`replys` int(10) unsigned NOT NULL DEFAULT ''0'',
`lastPostUserId` int(10) unsigned DEFAULT NULL,
`lastPostId` int(10) unsigned DEFAULT NULL,
`forumId` int(10) unsigned DEFAULT NULL,
`visits` int(10) unsigned NOT NULL DEFAULT ''0'',
`lastPostCreated` datetime NOT NULL DEFAULT ''0000-00-00 00:00:00'',
`lastPostNickName` varchar(30) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '''',
`createrNickName` varchar(30) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '''',
`solved` tinyint(1) NOT NULL DEFAULT ''0'',
`locked` tinyint(1) NOT NULL DEFAULT ''0'',
`lockedByUserId` int(10) unsigned NOT NULL DEFAULT ''0'',
`lockedDate` datetime NOT NULL DEFAULT ''0000-00-00 00:00:00'',
`alteredDate` datetime NOT NULL DEFAULT ''0000-00-00 00:00:00'',
`alteredUserId` int(10) unsigned DEFAULT NULL,
`glued` tinyint(1) NOT NULL DEFAULT ''0'',
`pollId` int(10) unsigned DEFAULT NULL,
`facebookPostId` bigint(20) DEFAULT NULL,
`facebookImportedDate` datetime DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `FK_forum_threads_1` (`forumId`),
KEY `FK_forum_threads_2` (`pollId`),
KEY `createdDate` (`createdDate`),
KEY `createrId` (`createrId`),
KEY `lastPostCreated` (`lastPostCreated`),
CONSTRAINT `FK_forum_threads_1` FOREIGN KEY (`forumId`) REFERENCES `forum` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=4306 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci'
'CREATE TABLE `forum` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`title` varchar(80) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '''',
`description` varchar(150) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '''',
`createdDate` datetime NOT NULL DEFAULT ''0000-00-00 00:00:00'',
`threads` int(10) unsigned NOT NULL DEFAULT ''0'',
`createrId` int(10) unsigned DEFAULT NULL,
`lastPostUserId` int(10) unsigned DEFAULT NULL,
`lastThreadId` int(10) unsigned DEFAULT NULL,
`parentForumId` int(10) unsigned DEFAULT NULL,
`lastPostNickName` varchar(30) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '''',
`lastPostCreated` datetime NOT NULL DEFAULT ''0000-00-00 00:00:00'',
`lastThreadTitle` varchar(80) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '''',
`alteredDate` datetime NOT NULL DEFAULT ''0000-00-00 00:00:00'',
`alteredUserId` int(10) unsigned DEFAULT NULL,
`placeOrder` int(10) unsigned NOT NULL DEFAULT ''0'',
`separator` tinyint(1) NOT NULL DEFAULT ''0'',
`rightLevel` int(10) unsigned NOT NULL DEFAULT ''1'',
`createChildForum` tinyint(3) unsigned NOT NULL DEFAULT ''1'',
`createThreads` tinyint(3) unsigned NOT NULL DEFAULT ''1'',
PRIMARY KEY (`id`),
KEY `Index_1` (`id`,`parentForumId`)
) ENGINE=InnoDB AUTO_INCREMENT=375 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci'