mysql登陸的命令格式為：

mysql -h [hostip] -u [username] -p [password] [database]

1.普通登陸mysql數據庫

命令格式：mysql -u 用戶名 -p 密碼，例如: mysql -u root -p root如果在-p后沒有提供密碼，則會在執行命令后要求用戶輸入密碼

2.制定端口號登陸，mysql的默認端口號是3306，

命令格式：mysql -u 用戶名 -p 密碼 -P 端口號

即可，注意指定端口的字母P為大寫，而標識密碼的p為小寫。

3.指定IP地址和端口號登錄MySQL數據庫

命令格式為：mysql -h ip -u 用戶 -p -P 端口號

例如：mysql -h 127.0.0.1 -u root -p -P 3306

4.制定數據庫登陸

mysql -h ip地址 -u 用戶名 -p 密碼 數據庫名

例如：mysql -h 127.0.0.1 -u root -p test

查看當前登陸用戶和數據庫

select user();

select database();

退出登陸命令

登陸進入mysql進入之后，可能到下面的提示信息，可以help看看輸出結果

mysql> help

For information about MySQL products and services, visit:

http://www.mysql.com/

For developer information, including the MySQL Reference Manual, visit:

http://dev.mysql.com/

To buy MySQL Enterprise support, training, or other products, visit:

https://shop.mysql.com/

List of all MySQL commands:

Note that all text commands 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 command with $EDITOR.

ego (\G) Send command to mysql server, display result vertically.

exit (\q) Exit mysql. Same as quit.

go (\g) Send command 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 command.

prompt (\R) Change your mysql prompt.

quit (\q) Quit mysql.

rehash (\#) Rebuild completion 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 command.

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'

通過輸出信息，我們知道如下三條退出mysql的命令

1. exit

2. quit

3. \q

總結

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