ubuntu 徹底刪除mysql 然後重裝mysql

刪除mysql 

 sudo apt-get autoremove --purge mysql-server-5.0
sudo apt-get remove mysql-server
sudo apt-get autoremove mysql-server
sudo apt-get remove mysql-common //這個很重要 

清理殘留數據
 dpkg -l |grep ^rc|awk '{print $2}' |sudo xargs dpkg -P 

重新安裝
 sudo apt-get install mysql-server 
安裝mysql
#sudo apt-get install mysql-server
#sudo apt-get install mysql-client

安裝jdbc
#sudo apt-get install libmysql-java

或手動下載 jdbc
http://dev.mysql.com/downloads/connector/j/5.1.html
下載解壓後，將mysql-connector-java-*.jar 複製到
java environment路徑 /usr/share/java/底下
並指將mysql.jar與mysql-connector-java.jar 都指向 mysql-connector-java-*.jar

CLASSPATH=".:/usr/share/java/mysql.jar"

設定
CLASSPATH=$CLASSPATH:/usr/share/java/mysql.jar
export CLASSPATH