为什么我看到"COLLATION'xxx'对于CHARACTER SET'yyy'无效"

Question

我在Amazon RDS上使用MySQL 5.6.22(InnoDB).我试图将我的所有表,列,连接和数据库字符集以及整理设置设置为utf8mb4/utf8mb4_unicode_ci.我在任何地方都找不到任何有charset的证据latin1,但是当我执行以下代码时(通过node-mysql,或直接在我的Mac上的"Sequel Pro"应用程序中):

update MyTable m 
set m.Column8 = 1
where m.Column3 = 26 and m.Column4 = 76
collate utf8mb4_unicode_ci

我收到此错误消息:

COLLATION 'utf8mb4_unicode_ci' is not valid for CHARACTER SET 'latin1'

我在配置中找不到任何设置latin1.

产量show variables like "char%":

character_set_client        utf8mb4
character_set_connection    utf8mb4
character_set_database      utf8mb4
character_set_filesystem    utf8mb4
character_set_results       utf8mb4
character_set_server        utf8mb4
character_set_system        utf8
character_sets_dir          /rdsdbbin/mysql-5.6.22.R1/share/charsets/

产量show variables like "collation%":

collation_connection        utf8mb4_unicode_ci
collation_database          utf8mb4_unicode_ci
collation_server            utf8mb4_unicode_ci

MyTable的CREATE TABLE信息是:

CREATE TABLE `MyTable` (
  `Column1` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
  `Column2` varchar(12) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  `Column3` bigint(20) unsigned NOT NULL,
  `Column4` bigint(20) unsigned NOT NULL,
  `Column5` timestamp(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6),
  `Column6` timestamp(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6),
  `Column7` varchar(112) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '',
  `Column8` tinyint(1) unsigned NOT NULL,
  `Column9` decimal(16,14) DEFAULT NULL,
  `Column10` decimal(17,14) DEFAULT NULL,
  `Column11` bigint(20) unsigned DEFAULT NULL,
  `Column12` bigint(20) unsigned DEFAULT NULL,
  `Column13` timestamp(6) NULL DEFAULT NULL,
  `Column14` timestamp(6) NULL DEFAULT NULL,
  `Column15` tinyint(4) NOT NULL DEFAULT '1',
  `Column16` tinyint(4) NOT NULL DEFAULT '1',
  `Column17` varchar(15) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  `Column18` varchar(200) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  `Column19` bigint(20) unsigned DEFAULT NULL,
  PRIMARY KEY (`Column1`),
  KEY `IX_Reevues_Column3` (`Column3`),
  KEY `IX_Reevues_Column4` (`Column4`),
  KEY `IX_Reevues_Column6` (`Column6`),
  KEY `IX_Reevues_Column8` (`Column8`),
  KEY `IX_Reevues_Column2` (`Column2`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

Answer 1

1. 为什么在比较BIGINT与文字数字时有一个COLLATE子句？ 删除UPDATE语句中的COLLATE子句. - 根据OP的评论,这是主要的解决方案.

2. 使用latin1构建的存储例程中的代码是什么？请显示创建程序(或功能)以查看是否属于这种情况.如果是这样,那么DROP并使用utf8mb4重新创建它.

3. 更改character_set_filesystem和character_set_server是有风险的.改回来.