mysql登陆的命令格式为
mysql -h [hostip] -u [username] -p [password] [database]
1.普通登陆mysql数据库
命令格式mysql -u 用户名 -p 密码，例如: mysql -u root -p root
如果在-p后没有提供密码，则会在执行命令后要求用户输入密码
2.制定端口号登陆，mysql的默认端口号是3306，
命令格式mysql -u 用户名 -p 密码 -P 端口号
即可，注意指定端口的字母P为大写，而标识密码的p为小写。
3.指定IP地址和端口号登录MySQL数据库
命令格式为mysql -h ip -u 用户 -p -P 端口号
例如mysql -h 127.0.0.1 -u root -p -P 3306
4.制定数据库登陆
mysql -h ip地址 -u 用户名 -p 密码 数据库名
例如mysql -h 127.0.0.1 -u root -p test
查看当前登陆用户和数据库
select user();
select database();
退出登陆命令
登陆进入mysql进入之后，可能到狼蚁网站SEO优化的提示信息，可以help看看输出结果
mysql> help
For information about MySQL products and services, visit:
http://.mysql./
For developer information, including the MySQL Reference Manual, visit:
http://dev.mysql./
To buy MySQL Enterprise support, training, or other products, visit:
https://shop.mysql./
List of all MySQL mands:
Note that all text mands must be first on line and end with ';'
? (\?) Synonym for `help'.
clear (\c) Clear the current input statement.
connect (\r) Reconnect to the server. Optional arguments are db and host.
delimiter (\d) Set statement delimiter.
edit (\e) Edit mand with $EDITOR.
ego (\G) Send mand to mysql server, display result vertically.
exit (\q) Exit mysql. Same as quit.
go (\g) Send mand to mysql server.
help (\h) Display this help.
nopager (\n) Disable pager, print to stdout.
notee (\t) Don't write into outfile.
pager (\P) Set PAGER [to_pager]. Print the query results via PAGER.
print (\p) Print current mand.
prompt (\R) Change your mysql prompt.
quit (\q) Quit mysql.
rehash (\#) Rebuild pletion hash.
source (\.) Execute an SQL script file. Takes a file name as an argument.
status (\s) Get status information from the server.
system (\!) Execute a system shell mand.
tee (\T) Set outfile [to_outfile]. Append everything into given outfile.
use (\u) Use another database. Takes database name as argument.
charset (\C) Switch to another charset. Might be needed for processing binlog with multi-byte charsets.
warnings (\W) Show warnings after every statement.
nowarning (\w) Don't show warnings after every statement.
resetconnection(\x) Clean session context.
For server side help, type 'help contents'
通过输出信息，我们知道如下三条退出mysql的命令
1. exit
2. quit
3. \q
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