How to create a UTF-8 Unicode Database on MySQL?
I am not going to cover installing, I have done that here:
How to install MySQL on FreeBSD 7.2 or on Red Hat 5.4?
So when you open MySQL using the command line MySQL client, you can see what Character Set your server is configured to use with this command:
show variables like 'character_set_server';
Often the default is Latin-1. I wish UTF-8 was the default but it is not.
You can see the language your database is created with by using this command:
show create database dbname
Again, usually the default is Latin-1 and again, I wish the default were UTF-8 but it is not.
So how do I make my MySQL database UTF-8?
How do I make UTF-8 the default?
I am going to find out…
Ok, so I have MySQL installed on two different platforms:
FreeBSD 7.2 x64.
Red Hat 5.4 x64.
My question are these:
What level do you set the Unicode setting at? Install instance, database, or column type.
MySQL – Looks like it can be configured globally in the my.cnf or it can be database specific.
To configure globally
Add the following to the my.cnf file:
[mysqld]
init_connect=’SET collation_connection = utf8_general_ci’
init_connect=’SET NAMES utf8′
default-character-set=utf8
character-set-server=utf8
collation-server=utf8_general_ci
skip-character-set-client-handshake
Note: There are other options for collation besides utf8_general_ci such as utf8_unicode_ci. See this article:
http://dev.mysql.com/doc/refman/5.1/en/charset-unicode-sets.html
Do I have to create the database in a special way?
Not if you configure the setting globally. However, if you don’t configure unicode support globally then yes you have to create your database in a specific way.
I found this post that is for an applications that uses a MySQL Unicode database. I don’t care about the application, just the MySQL data.
http://dev.mysql.com/doc/refman/5.1/en/create-database.html
http://dev.mysql.com/doc/refman/5.1/en/charset-applications.html
So the syntax will be:
CREATE DATABASE mydb DEFAULT CHARACTER SET utf8 DEFAULT COLLATE utf8_general_ci;
Do I have to compile differently to get unicode support?
I didn’t have to recompile on either FreeBSD or Red Hat.
Is there differences for each platform?
Slight differences.
FreeBSD
FreeBSD has the MySQL client as a dependency so it gets installed with the server with out any extra work.
The Database folder is /var/db/mysql.
For the global configuration there is not a my.cnf file created by default.
FreeBSD has example my.cnf files located here:
/usr/local/share/mysql
/usr/local/share/mysql/my-huge.cnf
/usr/local/share/mysql/my-innodb-heavy-4G.cnf
/usr/local/share/mysql/my-large.cnf
/usr/local/share/mysql/my-medium.cnf
/usr/local/share/mysql/my-small.cnf
You can create your own my.cnf or you can copy one of the examples.
In order to get the my.cnf to work, you should copy it and change the owner and add the [mysqld] settings.
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cp /usr/local/share/mysql/my-medium.cnf /var/db/mysql/my.cnf
chown mysql:mysql /var/db/mysql/my.cnf
cat << EOF >> /var/db/mysql/my.cnf
[mysqld]
init_connect=’SET collation_connection = utf8_general_ci’
init_connect=’SET NAMES utf8′
default-character-set=utf8
character-set-server=utf8
collation-server=utf8_general_ci
skip-character-set-client-handshake
EOF
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Red Hat
Red Hat does not have the MySQL client installed with the server, you have to download a separate RPM and install it. But it is really easy. Download both RPMs and install them.
The Database folder is /var/lib/mysql.
For the global configuration there is not a my.cnf file created by default.
Red Hat has example my.cnf files located here:
/usr/share/mysql
/usr/share/mysql/my-huge.cnf
/usr/share/mysql/my-innodb-heavy-4G.cnf
/usr/share/mysql/my-large.cnf
/usr/share/mysql/my-medium.cnf
/usr/share/mysql/my-small.cnf
Same as FreeBSD, there isn’t one used by default and you have to copy one and use it.
You can create your own my.cnf or you can copy one of the examples.
In order to get the my.cnf to work, you should copy it and change the owner and add the [mysqld] settings.
#
#
#
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#
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cp /usr/share/mysql/my-medium.cnf /var/lib/mysql/my.cnf
chown mysql:mysql /var/lib/mysql/my.cnf
cat << EOF >> /var/lib/mysql/my.cnf
[mysqld]
init_connect=’SET collation_connection = utf8_general_ci’
init_connect=’SET NAMES utf8′
default-character-set=utf8
character-set-server=utf8
collation-server=utf8_general_ci
skip-character-set-client-handshake
EOF
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