mysql登陸的命令格式為：

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

1.普通登陸mysql資料庫
命令格式：mysql -u 使用者名稱 -p 密碼，例如: mysql -u root -p root
如果在-p後沒有提供密碼，則會在執行命令後要求使用者輸入密碼

2.制定埠號登陸，mysql的預設埠號是3306，
命令格式：mysql -u 使用者名稱 -p 密碼 -P 埠號
即可，注意指定埠的字母P為大寫，而標識密碼的p為小寫。

3.指定IP地址和埠號登入MySQL資料庫
命令格式為：mysql -h ip -u 使用者 -p -P 埠號

4.制定資料庫登陸
mysql -h ip地址 -u 使用者名稱 -p 密碼 資料庫名
例如：mysql -h 127.0.0.1 -u root -p test

檢視當前登陸使用者和資料庫

select user();
  select database();

退出登陸命令
登陸進入mysql進入之後，可能到下面的提示資訊，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'

通過輸出資訊，我們知道如下三條退出mysql的命令
1. exit
2. quit
3. \q

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