在Mysql下有时候会出现mysql.sock位置错误，导致无法链接数据库。

mac下报错的时候：

首先修改my.cnf

位置在/etc/my.cnf下，假如没有的话，去/usr/locate/mysql版本/my.cnf下修改，然后复制到/etc下。

修改为如下：

[client]
socket = /tmp/mysql.sock

[mysqld]
socket = /tmp/mysql.sock

然后重启mysql服务，打开mysql看看位置变了没~用，status查看

mysql  Ver 14.14 Distrib 5.6.17, for osx10.7 (x86_64) using  EditLine wrapper

Connection id:		24
Current database:
Current user:		root@localhost
SSL:			Not in use
Current pager:		less
Using outfile:		''
Using delimiter:	;
Server version:		5.6.17 MySQL Community Server (GPL)
Protocol version:	10
Connection:		Localhost via UNIX socket
Server characterset:	utf8
Db     characterset:	utf8
Client characterset:	utf8
Conn.  characterset:	utf8
UNIX socket:		/tmp/mysql.sock
Uptime:			15 min 51 sec

在：

pdo_mysql.default_socket=/tmp/mysql.sock
mysql.default_socket = /tmp/mysql.sock
mysqli.default_socket = /tmp/mysql.sock

然后

sudo apachectl stop
sudo apachectl start

看phpinfo()下mysql.sock是否变了~

mysql错误-修改mysql.sock位置