I tried the following steps to upgrade CHARSET to utf8mb4 and to connect it to the existing backend server.
ALTER TABLE users CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
update the DB connection parameters.
This is the users table schema before migration.
CREATE TABLE IF NOT EXISTS `users` ( `id` BIGINT(20) NOT NULL AUTO_INCREMENT, `email` VARCHAR(255) NOT NULL DEFAULT '', `password` VARCHAR(255) NOT NULL DEFAULT '', `country_code` CHAR(4) NOT NULL DEFAULT '', `industry` VARCHAR(255) NOT NULL DEFAULT '', `company_size` VARCHAR(255) NOT NULL DEFAULT '', `company_name` VARCHAR(255) NOT NULL DEFAULT '', `last_name` VARCHAR(255) NOT NULL DEFAULT '', `first_name` VARCHAR(255) NOT NULL DEFAULT '', `newsletter` TINYINT(1) NOT NULL DEFAULT 0, `company_website` VARCHAR(255) NOT NULL DEFAULT '', `job_title` VARCHAR(255) NOT NULL DEFAULT '', `profile_picture` VARCHAR(255) NOT NULL DEFAULT '', `verified` TINYINT(1) NOT NULL DEFAULT 0, `p_updated_time` INT NOT NULL DEFAULT 0, `created` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP, `updated` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, PRIMARY KEY (`id`), UNIQUE KEY (`email`) )ENGINE = InnoDB DEFAULT CHARSET=UTF8;
Everything works fine so far.
My worry is that some of the VARCHAR columns have character constrain as 255. In this article https://mathiasbynens.be/notes/mysql-utf8mb4 and the accepted answer here How to easily convert utf8 tables to utf8mb4 in MySQL 5.5 says updating varchar(255) to 191 is needed. However I did not encounter issues without doing that, existing DB has around 100 user records and a dry run of the above migration worked perfectly.
- Is it mandatory to check and update column lengths when moving from utf8 to utf8mb4, if not what kind of issues could arise?
- Is it also mandatory to change the CHARSET of the database? Why not change only the charset of the table?
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