不得不吐槽mysql5.1这个版本实在是太不稳定了
，重启了一下mysql服务就崩溃了。
百度了好多博客，说什么修改my.ini文件就行了，尼玛都不行，还是谷歌靠谱，解决办法就是彻底卸载之后重新安装。
重新下载了mysql5.6的noinstall版本，解压缩到D盘文件夹命名为mysql。
1、 进入cmd 输入命令： sc delete mysql 提示若是delete service success,证明删除服务成功;
2、备份mysql5.1文件夹下的my.ini文件后直接将mysql5.1文件夹全部删除 （my.ini文件的配置请看我的这篇博客http://blog.csdn.net/jkxqj/article/details/9986731）。
3、开始->运行-> regedit 看看注册表里这几个地方删除没有
HKEY_LOCAL_MACHINESYSTEMControlSet001ServicesEventlogApplicationMySQL 目录删除
HKEY_LOCAL_MACHINESYSTEMControlSet002ServicesEventlogApplicationMySQL 目录删除
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesEventlogApplicationMySQL 目录删除（我卸载的时候没有找到，略过后仍达到完全卸载的目的。）
卸载完之后就重新安装吧。
4、新的文件夹名字为mysql，将之前备份的my.ini文件修改一下，我这里就直接贴我的了。
# Example MySQL config file for small systems. # # This is for a system with little memory (<= 64M) where MySQL is only used # from time to time and it's important that the mysqld daemon # doesn't use much resources. # # MySQL programs look for option files in a set of # locations which depend on the deployment platform. # You can copy this option file to one of those # locations. For information about these locations, see: # http://dev.mysql.com/doc/mysql/en/option-files.html # # In this file, you can use all long options that a program supports. # If you want to know which options a program supports, run the program # with the "--help" option. # The following options will be passed to all MySQL clients [client] #password = your_password port = 3306 socket = MySQL default-character-set=utf8 # Here follows entries for some specific programs # The MySQL server [mysqld] port = 3306 socket = MySQL character-set-server=utf8 skip-external-locking key_buffer_size = 16K max_allowed_packet = 1M table_open_cache = 4 sort_buffer_size = 64K read_buffer_size = 256K read_rnd_buffer_size = 256K net_buffer_length = 2K thread_stack = 128K basedir=D:mysql datadir=D:mysqldata # Don't listen on a TCP/IP port at all. This can be a security enhancement, # if all processes that need to connect to mysqld run on the same host. # All interaction with mysqld must be made via Unix sockets or named pipes. # Note that using this option without enabling named pipes on Windows # (using the "enable-named-pipe" option) will render mysqld useless! # #skip-networking server-id = 1 # Uncomment the following if you want to log updates #log-bin=mysql-bin # binary logging format - mixed recommended #binlog_format=mixed # Uncomment the following if you are using InnoDB tables #innodb_data_home_dir = C:\mysql\data\ #innodb_data_file_path = ibdata1:10M:autoextend #innodb_log_group_home_dir = C:\mysql\data\ # You can set .._buffer_pool_size up to 50 - 80 % # of RAM but beware of setting memory usage too high #innodb_buffer_pool_size = 16M #innodb_additional_mem_pool_size = 2M # Set .._log_file_size to 25 % of buffer pool size #innodb_log_file_size = 5M #innodb_log_buffer_size = 8M #innodb_flush_log_at_trx_commit = 1 #innodb_lock_wait_timeout = 50 [mysqldump] quick max_allowed_packet = 16M [mysql] no-auto-rehash # Remove the next comment character if you are not familiar with SQL #safe-updates [myisamchk] key_buffer_size = 8M sort_buffer_size = 8M [mysqlhotcopy] interactive-timeout
5、以管理员身份运行cmd。进入D盘，然后输入复制以下命令：
D:mysqlinmysqld -install mysql --defaults-file="D:mysqlmy.ini"
出现Servicesuccessfully installed.表示安装成功。
然后打开服务窗口（在运行框中输入services.msc即可打开服务窗口，然后可以找到mysql服务了）
6.启动MySQL服务
net start mysql
MySQL服务正在启动
5．登陆MySQL服务器
mysql -u root -p
Enterpassword:（root密码自己设置就好了，注意：MySQL的管理员用户名为root，密码默认为空。）