一、卸载mysql5.5
1.在服务中停止MySQL
2.控制面板->程序卸载->卸载掉mysql
3.删除C盘下的C:\ProgramData\MySQL 所有文件，该programData文件是隐藏的默认，设置显示后即可见
4.windows+R运行“regedit”文件，打开注册表删除注册表：
删除以下文件（有的可能没有）：
HKEY_LOCAL_MACHINE/SYSTEM/ControlSet001/Services/Eventlog/Applications/MySQL
HKEY_LOCAL_MACHINE/SYSTEM/ControlSet002/Services/Eventlog/Applications/MySQL
HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/Eventlog/Applications/MySQL
二、下载绿色版安装
mysql5.7.17下载地址：https://dev.mysql.com/downloads/file/?id=467269
解压到自己想放的目录下
1.配置环境变量
2.修改配置文件
复制my-default.ini，改名为my.ini打开my.ini，去掉#注释，把自己的目录加上去，datadir路径中的data目录解压出来是没有的需要自己创建。
# For advice on how to change settings please see # http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html # *** DO NOT EDIT THIS FILE. It's a template which will be copied to the # *** default location during install, and will be replaced if you # *** upgrade to a newer version of MySQL. [mysql] # 设置mysql客户端默认字符集 default-character-set=utf8 [mysqld] # Remove leading # and set to the amount of RAM for the most important data # cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%. # innodb_buffer_pool_size = 128M # Remove leading # to turn on a very important data integrity option: logging # changes to the binary log between backups. # log_bin # These are commonly set, remove the # and set as required. basedir = D:/software/mysql-5.7.17-winx64 datadir = D:/software/mysql-5.7.17-winx64/data port=3306 # 允许最大连接数 max_connections=200 # 服务端使用的字符集默认为8比特编码的latin1字符集 character-set-server=utf8 # 创建新表时将使用的默认存储引擎 default-storage-engine=INNODB # server_id = ..... # Remove leading # to set options mainly useful for reporting servers. # The server defaults are faster for transactions and fast SELECTs. # Adjust sizes as needed, experiment to find the optimal values. # join_buffer_size = 128M # sort_buffer_size = 2M # read_rnd_buffer_size = 2M sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
3.安装服务
管理员运行cmd
