编译安装mysql后经常碰到这个问题，明明有安装mysql的嘛
根本原因在于：mysql命令没有加载到当前用户的环境变量中
解决办法
#find / -name mysql
/usr/local/mysql/bin/mysql
方法1：临时解决办法
创建链接文件：
ln -s /usr/local/mysql/bin/mysql /usr/bin
方法2：永久解决办法
将mysql的bin目录加入环境变量
#echo "export PATH=/usr/local/mysql/bin:\$PATH" >> /root/.bash_profile
#source /root/.bash_profile
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