utf8mb4_general_ci是基于utf8mb4字符集的校对规则,其中ci表示大小写不敏感(Case Insensitive)。这意味着,在使用这个校对规则时,字符的比较和排序会忽略大小写差异。例如,在搜索或排序时,'a'和'A'会被视为相同。 说明如何在MySQL中设置utf8mb4字符集和utf8mb4_general_ci校对规则: 在MySQL中,可以在创建数据...
以一个简单的用户表为例,展示如何将字符集和校对规则修改为utf8mb4_unicode_ci。 CREATETABLEusers(idINTPRIMARYKEY,nameVARCHAR(50))DEFAULTCHARACTERSETutf8COLLATEutf8_general_ci;-- 将字符集设置为utf8mb4,校对规则为utf8mb4_unicode_ciALTERTABLEusersCONVERTTOCHARACTERSETutf8mb4COLLATEutf8mb4_unicode_ci; ...
报错如下: COLLATION'utf8_general_ci'isnot validforCHARACTER SET'utf8mb4'Query OK,0rows affected 原因是我本地的数据库版本是8,服务的版本是5,所以出现了兼容问题,解决如下 把utf8mb4_0900_ai_ci 改为 utf8mb4_unicode_ci SET NAMES utf8mb4; SET FOREIGN_KEY_CHECKS = 0; -- --- -- Table ...
character_sets_dir /usr/share/mysql-8.0/charsets/ */ -- 情景二: 通过SQL命令修改数据库、表的字符集 ALTER DATABASE shenl_2 CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci; ALTER TABLE tb_user CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci; -- 情景三: 修改客户端、连接、结果集的...
将当前会话的字符集设置为 utf8mb4,排序规则为 utf8mb4_general_ci。 obclient> SET NAMES 'utf8mb4' COLLATE 'utf8mb4_general_ci'; Query OK, 0 rows affected obclient> SHOW VARIABLES LIKE 'character_set_c%'; +---+---+ | VARIABLE_NAME | VALUE | +---+---+ | character_set_client...
obclient[test]>SET NAMES gbk COLLATE gbk_bin; 指定客户端、连接与结果字符集为utf8mb4,字符序为utf8mb4_general_ci。同时设置当前会话的wait_timeout变量值为 2147483 秒,对自定义的变量 @a 进行设定,将其值设置为 1。 obclient[test]>SET NAMES utf8mb4 COLLATE utf8mb4_general_ci, @@session.wai...
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci; 插入数据 find_in_set 实现 函数 CREATE DEFINER=`root`@`localhost` FUNCTION `getAllChild`(rootId varchar(16380)) RETURNS varchar(16380) CHARSET utf8mb4 COLLATE utf8mb4_general_ci DETERMINISTIC BEGIN DECLARE pTemp VARCHAR(...
COLLATE …];如：ALTER DATABASE `数据库名` character set utf8mb4 COLLATE utf8mb4_general_ci ...
CREATE TABLE t1 ( col1 CHAR(10) COLLATE utf8mb4_polish_ci ) CHARACTER SET latin1 COLLATE latin1_bin; The collation is specified for the column, but the character set is not. The column has collation utf8mb4_polish_ci and the character set is the one associated with the collation, wh...
解释DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci 在创建数据库的时候,经常用到一句:CREATE DATABASE `tpcms` DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci。具体意思不太明白,今查阅一番,总结如下: CREATE DATABASE `tpcms`:创建数据库tpcms。在命令行里创建的时候,`要用键盘Esc下的那个,而...