求大神!PHP无法连接MySQL,咋办?

本人刚学PHP。尝试连接MySQL,结果老是报错

<?php
    $conn=mysqli_connect("我家域名","用户名","密码","数据库");
    if (!$conn)
        echo "连接失败!";
    else
        echo "连接成功!";
?>

图片说明
求大神!求大神!

3个回答

简单来说,就是你的sql的用户名和密码不对,自己检查下,用户名一般是root,密码怎么设置的,有没有写错。连的是不是你期望的那个数据库。test.php检查下。

在登录验证时,客户端的密码格式和mysql服务端所要求的的密码格式不兼容,可能是版本问题吧,具体来讲就是php的mysql连接模块和mysql服务器的版本问题

warning 警告 不影响程序正常运行,这个说明你写的代码和你的服务器不兼容,改一下连接方式,使用pdo或者其它的连接方式

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最近用VS 2010跑JM17.0的源代码,编译运行之后那个运行窗口出现后一会儿就消失了,然后下面的编译信息窗口里出现了这些东西:'lencod.exe': Loaded 'C:\Users\Gabriel\JM17.0\bin\lencod.exe', Symbols loaded.rn'lencod.exe': Loaded 'C:\Windows\System32\ntdll.dll', Cannot find or open the PDB filern'lencod.exe': Loaded 'C:\Windows\System32\kernel32.dll', Cannot find or open the PDB filern'lencod.exe': Loaded 'C:\Windows\System32\KernelBase.dll', Cannot find or open the PDB filern'lencod.exe': Loaded 'C:\Windows\System32\ws2_32.dll', Cannot find or open the PDB filern'lencod.exe': Loaded 'C:\Windows\System32\msvcrt.dll', Cannot find or open the PDB filern'lencod.exe': Loaded 'C:\Windows\System32\rpcrt4.dll', Cannot find or open the PDB filern'lencod.exe': Loaded 'C:\Windows\System32\nsi.dll', Cannot find or open the PDB filern'lencod.exe': Loaded 'C:\Windows\System32\apphelp.dll', Cannot find or open the PDB filern'lencod.exe': Loaded 'C:\Windows\AppPatch\AcLayers.dll', Cannot find or open the PDB filern'lencod.exe': Loaded 'C:\Windows\System32\sspicli.dll', Cannot find or open the PDB filern'lencod.exe': Loaded 'C:\Windows\System32\user32.dll', Cannot find or open the PDB filern'lencod.exe': Loaded 'C:\Windows\System32\gdi32.dll', Cannot find or open the PDB filern'lencod.exe': Loaded 'C:\Windows\System32\lpk.dll', Cannot find or open the PDB filern'lencod.exe': Loaded 'C:\Windows\System32\usp10.dll', Cannot find or open the PDB filern'lencod.exe': Loaded 'C:\Windows\System32\shell32.dll', Cannot find or open the PDB filern'lencod.exe': Loaded 'C:\Windows\System32\shlwapi.dll', Cannot find or open the PDB filern'lencod.exe': Loaded 'C:\Windows\System32\ole32.dll', Cannot find or open the PDB filern'lencod.exe': Loaded 'C:\Windows\System32\oleaut32.dll', Cannot find or open the PDB filern'lencod.exe': Loaded 'C:\Windows\System32\userenv.dll', Cannot find or open the PDB filern'lencod.exe': Loaded 'C:\Windows\System32\profapi.dll', Cannot find or open the PDB filern'lencod.exe': Loaded 'C:\Windows\System32\winspool.drv', Cannot find or open the PDB filern'lencod.exe': Loaded 'C:\Windows\System32\mpr.dll', Cannot find or open the PDB filern'lencod.exe': Loaded 'C:\Windows\System32\imm32.dll', Cannot find or open the PDB filern'lencod.exe': Loaded 'C:\Windows\System32\msctf.dll', Cannot find or open the PDB filernThe program '[3872] lencod.exe: Native' has exited with code 300 (0x12c).rn看似系统的动态数据库链接文件一个也没连上。恳请高手帮忙解释一下这是什么问题,是不是编译路径还有什么地方没有设置好?我的系统是win7ultimated,vs2010Professional完全安装,安装全程没有任何问题。
php导出Excel求大神。
首先请排除phpExcel!!!!因为phpExcel实在是太慢了。导出6W条数据,用10分钟。。而且耗费内存太大,如果缓存到磁盘文件,倒是可以降低内存使用,但速度就更慢了。。。rnrnrn求大神给支个招,必须是导出Excel格式,CVS什么的已经实现。
php 错误 ,求大神指点
[code=php]rnpm.max_children = 100rnrn; The number of child processes created on startup.rn; Note: Used only when pm is set to 'dynamic'rn; Default Value: min_spare_servers + (max_spare_servers - min_spare_servers) / 2rnpm.start_servers = 64rn[/code]rn这是php-fpm的配置rnrn这是报的错误提示rn[code=php]rn[09-Sep-2013 18:34:08] NOTICE: [pool www] child 17687 exited with code 0 after 946.277592 seconds from startrn[09-Sep-2013 18:34:08] NOTICE: [pool www] child 17863 startedrn[09-Sep-2013 18:34:10] NOTICE: [pool www] child 17695 exited with code 0 after 943.633570 seconds from startrn[09-Sep-2013 18:34:10] NOTICE: [pool www] child 17864 startedrn[09-Sep-2013 18:34:10] NOTICE: [pool www] child 17680 exited with code 0 after 951.201460 seconds from startrn[09-Sep-2013 18:34:10] NOTICE: [pool www] child 17865 startedrn[09-Sep-2013 18:34:10] NOTICE: [pool www] child 17688 exited with code 0 after 947.766371 seconds from startrn[09-Sep-2013 18:34:10] NOTICE: [pool www] child 17866 startedrn[09-Sep-2013 18:34:12] NOTICE: [pool www] child 17684 exited with code 0 after 950.690947 seconds from startrn[09-Sep-2013 18:34:12] NOTICE: [pool www] child 17867 startedrn[09-Sep-2013 18:34:12] NOTICE: [pool www] child 17699 exited with code 0 after 944.328420 seconds from startrn[09-Sep-2013 18:34:12] NOTICE: [pool www] child 17868 startedrn[09-Sep-2013 18:34:12] NOTICE: [pool www] child 17691 exited with code 0 after 947.741519 seconds from startrn[09-Sep-2013 18:34:12] NOTICE: [pool www] child 17869 startedrn[09-Sep-2013 18:34:13] NOTICE: [pool www] child 17692 exited with code 0 after 947.166478 seconds from startrn[09-Sep-2013 18:34:13] NOTICE: [pool www] child 17870 startedrn[09-Sep-2013 18:34:15] NOTICE: [pool www] child 17681 exited with code 0 after 955.295629 seconds from startrn[09-Sep-2013 18:34:15] NOTICE: [pool www] child 17872 startedrn[09-Sep-2013 18:34:15] NOTICE: [pool www] child 17694 exited with code 0 after 949.284417 seconds from startrn[09-Sep-2013 18:34:15] NOTICE: [pool www] child 17873 startedrn[09-Sep-2013 18:34:16] NOTICE: [pool www] child 17703 exited with code 0 after 946.927298 seconds from startrn[09-Sep-2013 18:34:16] NOTICE: [pool www] child 17874 startedrn[09-Sep-2013 18:34:16] NOTICE: [pool www] child 17690 exited with code 0 after 952.074412 seconds from startrn[09-Sep-2013 18:34:16] NOTICE: [pool www] child 17875 startedrn[09-Sep-2013 18:34:16] NOTICE: [pool www] child 17685 exited with code 0 after 954.224209 seconds from startrn[09-Sep-2013 18:34:16] NOTICE: [pool www] child 17876 startedrn[09-Sep-2013 18:34:16] NOTICE: [pool www] child 17700 exited with code 0 after 948.412473 seconds from startrn[09-Sep-2013 18:34:16] NOTICE: [pool www] child 17877 startedrn[09-Sep-2013 18:34:16] NOTICE: [pool www] child 17682 exited with code 0 after 956.122602 seconds from startrn[09-Sep-2013 18:34:16] NOTICE: [pool www] child 17878 startedrn[09-Sep-2013 18:34:17] NOTICE: [pool www] child 17697 exited with code 0 after 950.541924 seconds from startrn[09-Sep-2013 18:34:17] NOTICE: [pool www] child 17879 startedrn[09-Sep-2013 18:34:17] NOTICE: [pool www] child 17696 exited with code 0 after 951.072985 seconds from startrn[09-Sep-2013 18:34:17] NOTICE: [pool www] child 17880 startedrn[09-Sep-2013 18:34:17] NOTICE: [pool www] child 17704 exited with code 0 after 948.670996 seconds from startrn[09-Sep-2013 18:34:17] NOTICE: [pool www] child 17881 startedrn[09-Sep-2013 18:34:17] NOTICE: [pool www] child 17710 exited with code 0 after 946.850688 seconds from startrn[09-Sep-2013 18:34:17] NOTICE: [pool www] child 17882 startedrn[/code]
PHP初学,求大神解惑
php如何用递归取得0-100中的偶数年并存储到数组中。
PHP和JS的问题,求大神!
document.writeln("<\/iframe> ")rnrnrnrn我网站中放置了一个JS里面是一段广告联盟代码,我想知道来访者有多少人点击了这个代码,用php+js怎么去做哦,这个一段点击广告代码。 需要PHP能获取到返回值
PHP 伪静态求大神帮忙~~~!
站点上目前绑定的是 a.xxx.com 可以访问整个网站,希望能做到绑定 b.xxx.com 域名作为快捷入口访问这个站的部分页面rnrnb.xxx.com/?222 -> a.xxx.com/xx/x/demo/222rn- 以上222是一个参数rn- b.xxx.com 除了能访问这个固定的页面,其他页面均不可访问(404)rnrn这样做是为了 使 b.xxx.com 是一个比较快捷的入口,相对URL又比较简洁,APACHE环境下的伪静态,这样能实现的了吗?麻烦大神了~~~~
求php mysql 事务处理
救命啊,我没有做过事务处理的,求个例子。
求PHP与mysql教程
求PHP与mysql教程
mysql 存储过程 求大神指点
在SqlServer中编写的 这个语句 rnDECLARE @t TABLE(id INT ,class VARCHAR(100) ,pid INT)rnINSERT INTO trn executern ( 'SELECT ' + idName + ' AS id,' + classNamern + ' AS class,' + pidName + ' AS pid FROM ' + tableNamern + ''rn )rnrn如何转换成可以在 mysql中也能执行,现在转换成下面格式,但execute处出错,要怎么修改才能执行呢??rnCREATE TEMPORARY TABLE t (id INT ,class VARCHAR(100) ,pid INT);rnINSERT INTO trn executern ( 'SELECT ' + idName + ' AS id,' + classNamern + ' AS class,' + pidName + ' AS pid FROM ' + tableNamern + ''rn )rnrn
mysql 行转列问题,求大神
[img=https://img-bbs.csdn.net/upload/201510/13/1444723243_881255.png][/img]rnrn如图,一个小小的问题,难倒了几百人,求大神解救。
mysql查询问题!!!求大神
数据表 table 字段 rnid valuern1 15,20rn2 9rn3 30,60rn4 40,50,60rnrn给定条件为 查询 value值在 6和20之间的值rn可以查询出id为1,2,3 三条数据rnrn给定条件为 查询 value值在 19和35之间的值rn可以查询出id为1,3 二条数据rnrn大致是这个意思 求大神搞定下
求mysql大神解决啊
这个是我的表的格式,rn[img=http://http://my.csdn.net/my/album/detail/1203473][/img]rn我想以这样的样式查询出来 求各位大神赐教啊,rn[img=http://http://my.csdn.net/my/album/detail/1203475][/img]
求大神~ MySQL数据库导入失败
错误nSQL 查询: nn-- phpMyAdmin SQL Dumpn-- version 4.0.10.7n-- http://www.phpmyadmin.netn--n-- 涓绘-------------------------------------n--n-- 琛ㄧdmin', 0, '', 0, 0, 'blank', 'Y-m-d', 0, 'line', 'a:2:s:5:"style";s:4:"dash";s:5:"items";s:2:"10";', 10, 0, '', 0, 0, 1444481460, 0, 0),n( 488, 'html_html', 0, '', '', '', ' ', 1, 'admin', 0, '', 0, 0, 'blank', '', 0, 'line', 'a:2:s:5:"style";s:4:"dash";s:5:"items";s:1:"0";', 10, 0, '', 0, 0, 1444481460, 0, 0 ) , ( 489, 'html_html', 0, '', '', '', ' ', 1, 'admin', 0, '', 0, 0, 'blank', '', 0, 'line', 'a:2:s:5:"style";s:4:"dash";s:5:"items";s:1:"0";', 10, 0, '', 0, 0, 1444481459, 0, 0 ) ;nnnnMySQL 返回: nn#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '488, 'html_html', 0, '', '', '', ' ', 1, 'admin', 0, '', 0, 0,' at line 9 n
mysql查询方法求大神指导
麻烦问下怎么可以通过数据库中使用select语句查询发帖数量然后把他从多到低排序。
相关热词 c++和c#哪个就业率高 c# 批量动态创建控件 c# 模块和程序集的区别 c# gmap 截图 c# 验证码图片生成类 c# 再次尝试 连接失败 c#开发编写规范 c# 压缩图片好麻烦 c#计算数组中的平均值 c#获取路由参数