1. mysql -h 127.0.0.1 的时候,使用TCP/IP连接,
mysql server 认为该连接来自于127.0.0.1或者是"localhost.localdomain"
2. mysql -h localhost 的时候,是不使用TCP/IP连接的,而使用Unix socket;
此时,mysql server则认为该client是来自"localhost"
3. mysql权限管理中的"localhost"有特定含义:
—— MySQL手册 5.6.4 ..... A Host value may be a hostname or an IP number, or 'localhost' to indicate the local host.
注意:虽然两者连接方式有区别,但当localhost 为默认的127.0.0.1时,两种连接方式使用的权限记录都是以下的1.row的记录(因为记录在前,先被匹配)
*************************** 1. row ***************************
Host: localhost
User: root
......
*************************** 2. row ***************************
Host: 127.0.0.1
User: root
证明:
shell> mysql -h 127.0.0.1
mysql> status;
Current user: root@localhost
SSL: Not in use
Current pager: stdout
Using outfile: ''
Using delimiter: ;
Server version: 5.1.33-log Source distribution
Protocol version: 10
Connection: 127.0.0.1 via TCP/IP
shell> mysql -h locahost
mysql> status;
Current user: root@localhost
SSL: Not in use
Current pager: stdout
Using outfile: ''
Using delimiter: ;
Server version: 5.1.33-log Source distribution
Protocol version: 10
Connection: Localhost via UNIX socket
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