MySQL：批量修改排序规则

生成修改表排序规则的SQL语句

SELECT CONCAT('ALTER TABLE ', TABLE_SCHEMA, '.', TABLE_NAME,
              ' CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;') '修正SQL'
from information_schema.tables
where TABLE_SCHEMA = '数据库名'
  and TABLE_COLLATION = 'utf8mb4_0900_ai_ci';

生成的 SQL 语句如下：

ALTER TABLE 数据库名.tb_batch CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;
ALTER TABLE 数据库名.tb_batch_scale CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;

复制执行即可；

生成修改字段排序规则的SQL语句

SELECT
    CONCAT('ALTER TABLE `', table_name, '` MODIFY `', column_name, '` ', DATA_TYPE,
        '(', CHARACTER_MAXIMUM_LENGTH, ') CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci',
        (CASE WHEN IS_NULLABLE = 'NO' THEN ' NOT NULL' ELSE '' END),
        (case when IFNULL(column_comment,'')='' then '' else concat(' COMMENT \'' , column_comment ,'\'') end),
        ';') as `修正SQL`
FROM information_schema.COLUMNS
WHERE 1=1
    and TABLE_SCHEMA = '数据库名' #要修改的数据库名称
    and DATA_TYPE = 'varchar'
    and COLLATION_NAME='utf8mb4_0900_ai_ci'

生成的 SQL 语句如下：

ALTER TABLE `tb_categories` MODIFY `code` varchar(100) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '标识';
ALTER TABLE `tb_categories` MODIFY `title` varchar(100) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '名称';

复制执行即可；