Example 4.13. Example properties for MySQL
kodo.ConnectionDriverName: com.mysql.jdbc.Driver kodo.ConnectionURL: jdbc:mysql://SERVER_NAME/DB_NAME
The default table types that MySQL uses do not
support transactions, which will prevent Kodo from
being able to roll back transactions. Use the
InnoDB table type
for any tables that Kodo will access.
MySQL does not support sub-selects in versions
prior to 4.1, and are disabled by default. Some
operations (such as the
method in a JDOQL query) will fail due to this. If
you are using MySQL 4.1 or later, you can lift
this restriction by setting the
of the kodo.jdbc.DBDictionary property.
Rollback due to database error or optimistic lock
violation is not supported unless the table type
is one of the MySQL transactional types. Explicit
rollback() before a
transaction has been committed, however, are
Floats and doubles may lose precision when stored in some datastores.
When storing a field of type
datastores will add extraneous trailing 0
characters, causing an equality mismatch between
the field that is stored and the field that is
Some version of the MySQL JDBC driver have a bug that prevents Kodo from being able to interrogate the database for foreign keys. Version 3.0.14 (or higher) of the MySQL driver is required in order to get around this bug.