Batch modify tables and sorting rules for fields in tables

Batch modify the sorting rules of fields in the table

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 `sql`
FROM information_schema.COLUMNS
WHERE 1=1
    and TABLE_SCHEMA = 'chenfu' # Database name to modify 
    and DATA_TYPE = 'text'
    and COLLATION_NAME='utf8mb4_0900_ai_ci';

• The results are as follows

ALTER TABLE `order` MODIFY `title` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci COMMENT ' title ';
ALTER TABLE `order_detail` MODIFY `title` varchar(64) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT ' title ';

Batch modify table collation

SELECT
CONCAT("ALTER TABLE `",TABLE_NAME,
"` CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;")  AS target_tables 
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA="chenfu" AND TABLE_TYPE="BASE TABLE";

• The results are as follows

ALTER TABLE `order` CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;
ALTER TABLE `order_detail` CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;

Reference resources

MySQL： Batch modify the sorting rules of table fields
MySQL Batch modify table character set collation