8. Connecting MMBase
to MySQL
using MySQL Connector/J
We can connect
MMBase
to our MySQL database server
using MySQL Connector/J.
This JDBC driver
for MySQL
can be downloaded from:
Copy the JDBC driver
to the MMBase
lib/ directory:
cp mysql-connector-java-xxx-bin.jar /usr/local/tomcat/webapps/mmbase-webapp/WEB-INF/lib/
chown tomcat:tomcat /usr/local/tomcat/webapps/mmbase-webapp/WEB-INF/lib/mysql-connector-java-xxx-bin.jar
chmod 664 /usr/local/tomcat/webapps/mmbase-webapp/WEB-INF/lib/mysql-connector-java-xxx-bin.jar
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Make this your JDBC driver
for MMBase
by editing
/usr/local/tomcat/webapps/mmbase-webapp/WEB-INF/config/modules/jdbc.xml.
Substitute the database name
(mmbase),
user (mmuser)
and password (mmpass)
with the database settings you'd like
MMBase to use.
<property name="url">jdbc:mysql://$HOST:$PORT/$DBM</property>
<property name="user">mmuser</property>
<property name="password">mmpass</property>
<property name="supportclass">org.mmbase.module.database.DatabaseSupportShim</property>
<property name="database">mmbase</property>
<property name="connections">20</property>
<property name="host">localhost</property>
<property name="driver">com.mysql.jdbc.Driver</property>
<property name="port">3306</property>
<property name="querys">256</property>
<property name="probetime">30</property>
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Set the ownership and access rights of this configuration file.
Since it contains your database name, user name and password,
make sure other users can not read this file.
chown tomcat:tomcat /usr/local/tomcat/webapps/mmbase-webapp/WEB-INF/config/modules/jdbc.xml
chmod 640 /usr/local/tomcat/webapps/mmbase-webapp/WEB-INF/config/modules/jdbc.xml
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Now create the MySQL database
you've just defined for
MMBase:
CREATE DATABASE <mmbase>;
USE <mmbase>;
GRANT SELECT,INSERT,UPDATE,DELETE,CREATE,DROP ON <mmbase>.* TO
<mmuser> at '%' IDENTIFIED BY '<password>';
GRANT SELECT,INSERT,UPDATE,DELETE,CREATE,DROP ON <mmbase>.* TO
<mmuser> at localhost IDENTIFIED BY '<password>';
GRANT SELECT,INSERT,UPDATE,DELETE,CREATE,DROP ON <mmbase>.* TO
<mmuser> at localhost.<domainname> IDENTIFIED BY '<password>';
# RH bug fix
GRANT SELECT,INSERT,UPDATE,DELETE,CREATE,DROP ON <mmbase>.* TO
<mmuser> at <hostname> IDENTIFIED BY '<password>';
flush privileges;
exit;
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Substitute the hostname (<hostname>)
and domain name (<domainname>)
with your own hostname and domain name,
and the database name (<mmbase>),
user (<mmuser>)
and password (<password>)
with the values you just entered in the JDBC driver configuration file.
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To quickly empty
your MySQL database,
i.e. after you've updated
your MMBase configuration or
application
(replace the database name <mmbase> with your
own):
mysqladmin -u root -p drop <mmbase>
mysqladmin -u root -p create <mmbase>
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If you are already using quite some
MySQL connections
(for example for authentication by and as a back-end to your mail daemons
and Apache servers),
the MySQL server
might run out of connections (its maximum number defaults to 100).
Then Tomcat
could simply refuse to start or give an error message
when initiating the
MySQL connection pool,
or your IMAP
or POP servers will have
problems authenticating their clients.
You can increase the maximum number of connections
to MySQL
by adding to the configuration file
/etc/my.cnf:
[mysqld]
set-variable = max_connections=200
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