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PHP下使用mysqli的函数连接mysql出现warning: mysqli::real_connect(): (hy000/1040): ...,mysqlihy000
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PHP下使用mysqli的函数连接mysql出现warning: mysqli::real_connect(): (hy000/1040): ...,mysqlihy000

Jun 13, 2016 am 08:46 AM
mysql mysqli

PHP下使用mysqli的函数连接mysql出现warning: mysqli::real_connect(): (hy000/1040): ...,mysqlihy000

背景:把mysql换成mysqli时出现,连接数过多,其实际上并不是,原因是我挪动了一下php的sock文件位置导致,因这几个socket修改没有修改完全,于是出现了too many connections ,从mysql里show processlist并没有发现真的有连接,其实用tshark抓下包估计能看到(http://justwinit.cn/post/7458/),并没有发出请求,而估计是mysqli的客户端自己报出来的,别看这个问题小,搞了老半天,都想重新安装Php了,发现原来是路径写错了同时mysqli的客户端提示连接数过多的误提示导致方向走错了。如下:

[root@iZ25z0ugwgtZ etc]# grep -r "mysql.sock" ./
./php.ini:pdo_mysql.default_socket=/data/runsock/mysqlsock/mysql.sock
./php.ini:;mysql.default_socket = /tmp/mysql.sock
./php.ini:mysql.default_socket = /data/runsock/mysqlsock/mysql.sock
./php.ini:mysqli.default_socket = /data/runsock/mysql.sock //这个位置被挪动到,/data/runsock/mysqlsock/mysql.sock导致。
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修改后记得重启动php-fpm:

[root@iZ25z0ugwgtZ etc]# service php-fpm restart
Gracefully shutting down php-fpm . done
Starting php-fpm done
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______________________排查要点如下_______________________________

warning: mysqli::real_connect(): (hy000/1040): too many connections in:

出现场景 :手动编译安装mysql,并制定安装位置,php以localhost方式连接mysql

原因分析 :手动编译安装制定位置后所有的mysql文件都在制定的目录或者data目录下面,php默认只会寻找/temp/mysql.sock找这个sock文件,所以会导致sock文件无法找到。

解决方法 :

1.给sock文件做个软链

ln -s /data/mysqldb/mysql.sock /tmp/mysql.sock;

或者

2.修改php的默认mysql.sock连接地址

mysql.default_socket=/data/mysqldb/mysql.sock

3.使用tcp socket的方式进行连接

mysql('127.0.0.1','username','passwod');

下面给大家介绍PHP mysql_connect() 函数

定义和用法

mysql_connect() 函数打开非持久的 MySQL 连接。

语法

mysql_connect(server,user,pwd,newlink,clientflag)
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参数 描述
server

可选。规定要连接的服务器。

可以包括端口号,例如 "hostname:port",或者到本地套接字的路径,例如对于 localhost 的 ":/path/to/socket"。

如果 PHP 指令 mysql.default_host 未定义(默认情况),则默认值是 'localhost:3306'。

user 可选。用户名。默认值是服务器进程所有者的用户名。
pwd 可选。密码。默认值是空密码。
newlink 可选。如果用同样的参数第二次调用 mysql_connect(),将不会建立新连接,而将返回已经打开的连接标识。参数 new_link 改变此行为并使 mysql_connect() 总是打开新的连接,甚至当 mysql_connect() 曾在前面被用同样的参数调用过。
clientflag

可选。client_flags 参数可以是以下常量的组合:

  • MYSQL_CLIENT_SSL - 使用 SSL 加密
  • MYSQL_CLIENT_COMPRESS - 使用压缩协议
  • MYSQL_CLIENT_IGNORE_SPACE - 允许函数名后的间隔
  • MYSQL_CLIENT_INTERACTIVE - 允许关闭连接之前的交互超时非活动时间

返回值

如果成功,则返回一个 MySQL 连接标识,失败则返回 FALSE。

提示和注释

注释:脚本一结束,到服务器的连接就被关闭,除非之前已经明确调用 mysql_close() 关闭了。
提示:要创建一个持久连接,请使用 mysql_pconnect() 函数。

例子

<&#63;php
$con = mysql_connect("localhost","mysql_user","mysql_pwd");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
// 一些代码...
mysql_close($con);
&#63;>
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