Mac上安装mysql

打开mysql官网下载安装包

选择下载

注意下载mysql community server这个是免费的

这里我下载的5.7版本的，比较稳定，现在最新版本是8.x了

等待下载完成，然后就是傻瓜式安装了，各种同意、继续。注意有一步是安装路径，默认是在/usr/local/mysql下，这里可以不更改路径，按默认安装。安装完成后会弹出一个小窗口

记住这个密码，是链接mysql的初始密码。把root@localhost:后面的复制下来。

现在就是安装完成了。然后可以在系统偏好设置中最下面找到mysql打开

默认mysql是关闭的，可以点击开启

现在mysql已经正常运行了，下面可以链接登录了。

打开终端，cd到安装目录下，cd /usr/local/mysql/bin, 注意这个路径是安装的默认路径，如果更改了，cd到自己更改后的路径下。

 然后执行命令：./mysql -u root -p    登录数据库

这是会让输入密码，安装时有个复制下来的密码，粘在这。

 这时就表示登录成功了。现在就可以正常使用了。

下面我们可以改下初始密码。

在刚才的命令下 输入：

SET PASSWORD FOR 'root'@'localhost' = PASSWORD('123456')；回车

FLUSH PRIVILEGES;回车

123456是自己要设置的密码。

然后exit退出这个命令

这时新密码就可以用了。可以先退出，然后cd /usr/local/mysql/bin ,

 然后执行命令：./mysql -u root -p

这时输入新密码试试。

最后说下更改环境变量，

  打开终端执行命令：touch .bash_profile 新建一个文件

 然后用vim命令编辑

键盘输入 i 进入编辑模式

输入：export PATH=/usr/local/mysql/bin:$PATH

然后按 esc建退出编辑模式，输入:wq保存退出，然后执行下source .bash_profile立即生效。

这时就更改好了，可以看下路径：  echo $PATH

 这时就表示环境变量配置成功了;  以后打开终端不用在cd到之前目录下了，可以直接执行mysql -u root -p   登录了

Vim 简单操作

i 进入编辑模式  ESC 退出到 命令模式 

:wq  保存退出    :q!  不报存直接退出

补充：在my.cnf设置默认密码，以后不用每次都输密码了

mysql 5.7.18之后mysql中没有my.cnf文件，所以可以自己创建。

在终端 cd /etc 

然后：sudo vim my.cnf 创建cnf文件 接着输入i进入编辑模式，把以下命令输入 然后esc-:wq保存退出。这时可以open /etc 打开etc文件夹后可以看到刚刚创建的my.cnf。

然后重启下mysql就可以了。

# Example MySQL config file for medium systems.

#

# This is for a system with little memory (32M - 64M) where MySQL plays

# an important part, or systems up to 128M where MySQL is used together with

# other programs (such as a web server)

#

# 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]

default-character-set=utf8

#下面这个密码就是要设置的默认密码

password = 你的密码

port = 3306

socket = /tmp/mysql.sock

# Here follows entries for some specific programs

# The MySQL server

[mysqld]

character-set-server=utf8

init_connect='SET NAMES utf8

port = 3306

socket = /tmp/mysql.sock

skip-external-locking

key_buffer_size = 16M

max_allowed_packet = 1M

table_open_cache = 64

sort_buffer_size = 512K

net_buffer_length = 8K

read_buffer_size = 256K

read_rnd_buffer_size = 512K

myisam_sort_buffer_size = 8M

character-set-server=utf8

init_connect='SET NAMES utf8'

# 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

# (via the "enable-named-pipe" option) will render mysqld useless!

#

#skip-networking

# Replication Master Server (default)

# binary logging is required for replication

log-bin=mysql-bin

# binary logging format - mixed recommended

binlog_format=mixed

# required unique id between 1 and 2^32 - 1

# defaults to 1 if master-host is not set

# but will not function as a master if omitted

server-id = 1

# Replication Slave (comment out master section to use this)

#

# To configure this host as a replication slave, you can choose between

# two methods :

#

# 1) Use the CHANGE MASTER TO command (fully described in our manual) -

# the syntax is:

#

# CHANGE MASTER TO MASTER_HOST=<host>, MASTER_PORT=<port>,

# MASTER_USER=<user>, MASTER_PASSWORD=<password> ;

#

# where you replace <host>, <user>, <password> by quoted strings and

# <port> by the master's port number (3306 by default).

#

# Example:

#

# CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306,

# MASTER_USER='joe', MASTER_PASSWORD='secret';

#

# OR

#

# 2) Set the variables below. However, in case you choose this method, then

# start replication for the first time (even unsuccessfully, for example

# if you mistyped the password in master-password and the slave fails to

# connect), the slave will create a master.info file, and any later

# change in this file to the variables' values below will be ignored and

# overridden by the content of the master.info file, unless you shutdown

# the slave server, delete master.info and restart the slaver server.

# For that reason, you may want to leave the lines below untouched

# (commented) and instead use CHANGE MASTER TO (see above)

#

# required unique id between 2 and 2^32 - 1

# (and different from the master)

# defaults to 2 if master-host is set

# but will not function as a slave if omitted

#server-id = 2

#

# The replication master for this slave - required

#master-host = <hostname>

#

# The username the slave will use for authentication when connecting

# to the master - required

#master-user = <username>

#

# The password the slave will authenticate with when connecting to

# the master - required

#master-password = <password>

#

# The port the master is listening on.

# optional - defaults to 3306

#master-port = <port>

#

# binary logging - not required for slaves, but recommended

#log-bin=mysql-bin

# Uncomment the following if you are using InnoDB tables

#innodb_data_home_dir = /usr/local/mysql/data

#innodb_data_file_path = ibdata1:10M:autoextend

#innodb_log_group_home_dir = /usr/local/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

default-character-set=utf8

[myisamchk]

key_buffer_size = 20M

sort_buffer_size = 20M

read_buffer = 2M

write_buffer = 2M

[mysqlhotcopy]

interactive-timeout