MySQL utf8mb4, Errors when saving Emojis

问题:

I try to save names from users from a service in my MySQL database. Those names can contain emojis like ???? (just for examples)

After searching a little bit I found this stackoverflow linking to this tutorial. I followed the steps and it looks like everything is configured properly.

I have a Database (charset and collation set to utf8mb4 (_unicode_ci)), a Table called TestTable, also configured this way, as well as a "Text" column, configured this way (VARCHAR(191) utf8mb4_unicode_ci).

When I try to save emojis I get an error:

Example of error for shortcake (?):     Warning: #1300 Invalid utf8 character string: 'F09F8D'     Warning: #1366 Incorrect string value: '\xF0\x9F\x8D\xB0' for column 'Text' at row 1 

Though I didn't try all of them to be honest.

Is there something I'm missing in the configuration?

Please note: All tests of saving didn't involve a client side. I use phpmyadmin to manually change the values and save the data. So the proper configuration of the client side is something that I will take care of after the server properly saves emojis.

Another Sidenote: Currently, when saving emojis I either get the error like above, or get no error and the data of Username ? will be stored as Username ????. Error or no error depends on the way I save. When creating/saving via SQL Statement I save with question marks, when editing inline I save with question marks, when editing using the edit button I get the error.

thank you

EDIT 1: Alright so I think I found out the problem, but not the solution. It looks like the Database specific variables didn't change properly.

When I'm logged in as root on my server and read out the variables (global):
Query used: SHOW VARIABLES WHERE Variable_name LIKE 'character\_set\_%' OR Variable_name LIKE 'collation%';

+--------------------------+--------------------+ | Variable_name            | Value              | +--------------------------+--------------------+ | character_set_client     | utf8mb4            | | character_set_connection | utf8mb4            | | character_set_database   | utf8mb4            | | character_set_filesystem | binary             | | character_set_results    | utf8mb4            | | character_set_server     | utf8mb4            | | character_set_system     | utf8               | | collation_connection     | utf8mb4_unicode_ci | | collation_database       | utf8mb4_unicode_ci | | collation_server         | utf8mb4_unicode_ci | +--------------------------+--------------------+ 10 rows in set (0.00 sec) 

For my Database (in phpmyadmin, the same query) it looks like the following:

+--------------------------+--------------------+ | Variable_name            | Value              | +--------------------------+--------------------+ | character_set_client     | utf8               | | character_set_connection | utf8mb4            | | character_set_database   | utf8mb4            | | character_set_filesystem | binary             | | character_set_results    | utf8               | | character_set_server     | utf8               | | character_set_system     | utf8               | | collation_connection     | utf8mb4_unicode_ci | | collation_database       | utf8mb4_unicode_ci | | collation_server         | utf8mb4_unicode_ci | +--------------------------+--------------------+ 

How can I adjust these settings on the specific database? Also even though I have the first shown settings as default, when creating a new database I get the second one as settings.

**Edit 2:""

Here is my my.cnf file:

[client] port=3306 socket=/var/run/mysqld/mysqld.sock default-character-set = utf8mb4  [mysql] default-character-set = utf8mb4  [mysqld_safe] socket=/var/run/mysqld/mysqld.sock  [mysqld] user=mysql pid-file=/var/run/mysqld/mysqld.pid socket=/var/run/mysqld/mysqld.sock port=3306 basedir=/usr datadir=/var/lib/mysql tmpdir=/tmp lc-messages-dir=/usr/share/mysql log_error=/var/log/mysql/error.log max_connections=200 max_user_connections=30 wait_timeout=30 interactive_timeout=50 long_query_time=5 innodb_file_per_table character-set-client-handshake = FALSE character-set-server = utf8mb4 collation-server = utf8mb4_unicode_ci  !includedir /etc/mysql/conf.d/ 

回答1:

character_set_client, _connection, and _results must all be utf8mb4 for that shortcake to be eatable.

Something, somewhere, is setting a subset of those individually. Rummage through my.cnf and phpmyadmin's settings -- something is not setting all three.

If SET NAMES utf8mb4 is executed, all three set correctly.

The sun shone because it is only 3-bytes - E2 98 80; utf8 is sufficient for 3-byte utf8 encodings of Unicode characters.

回答2:

For me, it turned out that the problem lied in mysql client.

mysql client updates my.cnf's char setting on a server, and resulted in unintended character setting.

So, What I needed to do is just to add character-set-client-handshake = FALSE. It disables client setting from disturbing my char setting.

my.cnf would be like this.

[mysqld] character-set-client-handshake = FALSE character-set-server = utf8mb4 ... 

Hope it helps.

回答3:

It is likely that your service/application is connecting with "utf8" instead of "utf8mb4" for the client character set. That's up to the client application.

For a PHP application see http://php.net/manual/en/function.mysql-set-charset.php or http://php.net/manual/en/mysqli.set-charset.php

For a Python application see https://github.com/PyMySQL/PyMySQL#example or http://docs.sqlalchemy.org/en/latest/dialects/mysql.html#mysql-unicode

Also, check that your columns really are utf8mb4. One direct way is like this:

mysql> SELECT character_set_name FROM information_schema.`COLUMNS`  WHERE table_name = "user"   AND column_name = "displayname"; +--------------------+ | character_set_name | +--------------------+ | utf8mb4            | +--------------------+ 1 row in set (0.00 sec) 

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