查询数据库表的字段的字符集和排序规则和修正SQL，执行后复制修正SQL执行即可修改字符集和排序规则
SELECT
TABLE_SCHEMA '数据库',
TABLE_NAME '表',
COLUMN_NAME '字段',
CHARACTER_SET_NAME '原字符集',
COLLATION_NAME '原排序规则',
CONCAT( 'ALTER TABLE ', TABLE_SCHEMA, '.', TABLE_NAME, ' MODIFY COLUMN ', COLUMN_NAME, ' ', COLUMN_TYPE, ' CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;' ) '修正SQL'
FROM
information_schema.`COLUMNS`
WHERE
COLLATION_NAME RLIKE 'utf8' AND COLLATION_NAME != 'utf8mb4_general_ci' AND TABLE_SCHEMA='db_cbt';
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