10 Apr
2016
10 Apr
'16
1:40 p.m.
On Fri, Apr 8, 2016 at 8:51 PM, Debajit Adhikary <debajit.work(a)gmail.com> wrote:
I have changed my MySQL database columns to support
utf8mb4 (4-byte
unicode), and I can render chinese characters etc correctly now.
Chinese characters work fine with uft8 too.
When I upgrade my XWiki to a newer version in the future, will this cause
issues in the upgrade? (I am guessing there may be database schema changes
in a future XWiki version)
The migrator usually don't look at the encoding (unless specific
encoding related migration) so it should be Ok.
On Thu, Apr 7, 2016 at 7:08 PM, Sergiu Dumitriu <sergiu(a)xwiki.org> wrote:
--
Thomas Mortagne
It will be almost impossible to use utf8mb4 with
XWiki, because of the
terrible way mysql is designed. Here's the reason why:
mysql imposes several hard limits on the maximum size of several things:
length of indexes, length of rows. These lengths, unfortunately, are not
computed as the maximum size of the actual data, but of the theoretical
data that could be placed in there. This means that the size of a
VARCHAR(255) isn't 255 bytes, but 255 chars * maximum number of bytes
that such a char could have (3 for utf8, 4 for utf8mb4).
You could make it work if you change the schema to reduce the length of
several fields, but you would do that at your own risk.
On 04/06/2016 08:58 PM, Debajit Adhikary wrote:
--
Sergiu Dumitriu
http://purl.org/net/sergiu/
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http://lists.xwiki.org/mailman/listinfo/users Some more information:
On my Mac, when I try to set up XWiki with MySQL, I ran the following:
# Install mysql and start
brew update
brew install mysql
mysql.server start
# Now I can connect as "mysql -uroot"
# Create a new MySQL database for XWiki
# see
http://platform.xwiki.org/xwiki/bin/view/AdminGuide/InstallationMySQL
mysql -u root -e "create database xwiki default character set utf8mb4
collate utf8mb4_unicode_ci"
mysql -u root -e "grant all privileges on *.* to xwiki@localhost
identified by 'xwiki'"
# Configure hibernate.cfg.xml
# This is only the mysql section
<property
name="connection.url">jdbc:mysql://localhost/xwiki</property>
<property
name="connection.username">xwiki</property>
<property name="connection.password">xwiki</property>
<property
name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property
name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
<property name="connection.useUnicode">true</property>
<property name="connection.characterEncoding">UTF-8</property>
<property name="dbcp.poolPreparedStatements">true</property>
<property name="dbcp.maxOpenPreparedStatements">20</property>
<mapping resource="xwiki.hbm.xml"/>
<mapping resource="feeds.hbm.xml"/>
<mapping resource="activitystream.hbm.xml"/>
<mapping resource="instance.hbm.xml"/>
<mapping resource="mailsender.hbm.xml"/>
Now when I start XWiki, I get the error:
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException:
Row size too large. The maximum row size for the used table type, not
counting BLOBs, is 65535. This includes storage overhead, check the
manual.
You have to change some columns to TEXT or BLOBs
It looks like whatever creates the XWiki tables is not handling utf8mb4
(see also https://mathiasbynens.be/notes/mysql-utf8mb4 ).
On Wed, Apr 6, 2016 at 5:17 PM, Debajit Adhikary <debajit.work(a)gmail.com
wrote:
> I have an XWiki installation, and I noticed that emoji's were not
getting
saved
correctly and were rendering as question marks in XWiki. This is
caused by MySQL's default encoding which is "utf8" and not
"utf8mb4"
(4-byte UTF to store the full unicode character set)
To fix this, I am in the process of converting all my MySQL database
tables into utf8mb4 encoding, which is turning out to be quite a lot of
manual work.
When XWiki creates the database tables for MySQL, can it use utf8mb4
encoding by default? Is this something I could open a bug request for?
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