从Java同时使用MySQL 3.x和5.x.

Question

How can I use MySQL 3.x and MySQL 5.x simultaneously from my Java application if the two versions need different versions of JDBC drivers but the driver class name is the same?

For MySQL 3.x I downloaded MySQL Connector/J 3.0.17 and for MySQL 5.x I have MySQL Connector/J 5.1.12. How can I use them both?

Answer 1

First check whether (as mentioned by @DaveHowes +1) you can use JDBC driver for v5 with DB v3. It probably works. In this case you have no problem.

If it does not work you have to use separate class loaders for 2 connectors to 2 different DBs. So, neither v5 nor v3 JDBC driver will not be in "regular" classpath of your application. Instead you should create some kind of wrapper that will instantiate its own UrlClassLoader : and start driver. The mentioned collector should expose API that allows you to perform JDBC query. I hope this will work. All this if you are using pure JDBC. If you are using some kind of tools (eg Hibernate, iBatis etc.) I wish you good luck :) and suggest to ask more specific question that mentions tool you are using.