How to change all the tables in my database to UTF8 character set?

问题

My database is not in UTF8, and I'd like to convert all the tables to UTF8, how can I do this?

回答1:

For single table you can do something like this:

ALTER TABLE tab CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci;

For the whole database I don't know other method than similar to this:

http://www.commandlinefu.com/commands/view/1575/convert-all-mysql-tables-and-fields-to-utf8

回答2:

mysqldump --user=username --password=password --default-character-set=latin1 --skip-set-charset dbname > dump.sql
sed -r 's/latin1/utf8/g' dump.sql > dump_utf.sql
mysql --user=username --password=password --execute="DROP DATABASE dbname; CREATE DATABASE dbname CHARACTER SET utf8 COLLATE utf8_general_ci;"
mysql --user=username --password=password --default-character-set=utf8 dbname < dump_utf.sql

回答3:

replace my_database_name with your database name

SELECT CONCAT('ALTER TABLE ', TABLE_NAME, ' CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci;')
FROM information_schema.TABLES
WHERE TABLE_SCHEMA = 'my_database_name' AND TABLE_TYPE != 'VIEW';

this will build lots of queries which you can run

回答4:

Better yet, use Percona's tool kit. I'd audit your indices before updating to utf8mb4 as there are issues with key length.

SELECT CONCAT('pt-online-schema-change --alter "CONVERT TO CHARACTER SET utf8 
COLLATE utf8_unicode_ci" t=', TABLE_NAME, ',D=DB_NAME,u=USER_NAME --statistics --execute') 
FROM information_schema.TABLES 
WHERE TABLE_SCHEMA = 'DB_NAME' AND TABLE_TYPE != 'VIEW' AND TABLE_COLLATION NOT LIKE '%utf8%';

来源：https://stackoverflow.com/questions/2150256/how-to-change-all-the-tables-in-my-database-to-utf8-character-set

标签

mysql

utf-8

collation

alter