114-批量修改数据库表和表字段的字符集

批量拼接修改字段的字符集：

SELECT CONCAT('ALTER TABLE `', TABLE_SCHEMA,'`.`',TABLE_NAME, '` MODIFY COLUMN `',COLUMN_NAME,'` ',COLUMN_TYPE,' CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci COMMENT "',COLUMN_COMMENT,'";') as 'sql'
FROM information_schema.`COLUMNS` 
where  TABLE_SCHEMA='test' 
and CHARACTER_SET_NAME is not null 

批量拼接修改表的字符集：

SELECT CONCAT('ALTER TABLE `',TABLE_NAME,'` CHARACTER SET = utf8mb4, COLLATE = utf8mb4_general_ci;') as a2 
FROM information_schema.`TABLES` 
WHERE TABLE_SCHEMA='test'