Qt5.2连接Mysql的问题，为什么链接不上呢-CSDN论坛

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Qt5.2连接Mysql的问题，为什么链接不上呢 [问题点数：20分，结帖人anz130]

⋅android 图片分类浏览 ⋅Qt5.2连接Mysql的问题，为什么链接不上呢 ⋅关于同时获取数据源冲突的问题 更多帖子 关注私聊空间博客 anz130 本版专家分：0 结帖率 94.44%: 下载了最新版本的qt5.2还有MySQL新版，但是再链接的时候，怎么也链接不上，因为我是刚开始学习QT，可能也是我的方法不对，所以想向大家请教下，到底要怎么做才能够链接上mysql并读取数据进行显示呢？？
可以的话，给个例子，谢谢。
我按照 http://blog.csdn.net/u013407373/article/details/18086995
这个做了，但是链接出问题了。

0 2014-01-16 22:15:41

回复数 9 只看楼主引用举报楼主

⋅三年从业者的迷茫 ⋅请教大神们一个问题 ⋅求助各位大神，到底什么叫会HTML5 更多帖子 关注私聊空间博客 请叫我砖家 本版专家分：749: 我之前遇到了这方面的问题不知道和你一不一样，我是用Qt Creator写的，然后找不到文件路径，这个项目工程必须建在C:\Qt\Qt5.2.0\Tools\QtCreator\bin目录下才行。对应你自己的Qt安装目录去找，希望能帮到你

0 2014-01-17 08:57:23

只看TA 引用举报 #1 得分 20

Qt链接数据库出现“QMYSQL driver not loaded”的解决办法 VS2012+QT5.2.1+MySQL 5.1.51 Win32数据库编写程序运行：void QtUser::getData(void){ QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL"); db.setHostName("localhost"); db.setPort(3306); db.setDatabaseName...

⋅android 图片分类浏览 ⋅Qt5.2连接Mysql的问题，为什么链接不上呢 ⋅关于同时获取数据源冲突的问题 更多帖子 关注私聊空间博客 anz130 本版专家分：0: 我也是用 Qt Creator 写的，经过高手的指导，现在已经可以链接了，但是必须要把qt安装目录下的plugins的sqldrivers拷贝到程序目录才行，但是这样每次写不是很麻烦吗，有没有什么其他方法呢，有说设置系统的环境变量，但是怎么设置呢？？

0 2014-01-17 13:59:44

只看TA 引用举报 #2 得分 0

Qt连接MySQL提示“QSqlDatabase: QMYSQL driver not loaded”的解决办法我使用的Qt版本是Qt5.7.1 msvc2015 64位版，实际上并没有使用MySQL，而是MariaDB，版本为10.2.6。当我运行Qt附带的样例“sqlbrowser”时，总会提示如下信息：QSqlDatabase: QMYSQL driver not loaded QSqlDatabase: available drivers: QSQLITE QMYSQL QMYSQL3 QODBC Q

⋅android 图片分类浏览 ⋅Qt5.2连接Mysql的问题，为什么链接不上呢 ⋅关于同时获取数据源冲突的问题 更多帖子 关注私聊空间博客 anz130 本版专家分：0: 我在环境变量中加入了：  Qt\Qt5.2.0\5.2.0\mingw48_32\plugins\sqldrivers;这个路径，是可以编译了，但不知这样做是否会有问题。
不知大家是否有更好的方法。

0 2014-01-17 14:42:07

只看TA 引用举报 #3    得分 0

QSqlDatabase: QMYSQL driver not loaded 原因以及解决办法背景介绍： Qt的桌面版包括如下一些驱动程序：[摘录于《C++ GUI Qt4 编程第二版》]     QDB2         IBMDB2 7.1 版本以及更新的版本     QIBASE         Borland InterBase     QMYSQL      Oracle Call Interface     QODBC          ODBC（包括微...

⋅VC 水晶报表9 动态显示图片如何处理？ ⋅如何更改日志传输数据库的状态？（备用/只读） ⋅sqlserver的复制/镜像，哪个实时性较好？ 更多帖子 关注私聊空间博客 MMX 本版专家分：0: 我是可能编译通过，但总是打不开mysql显示：QSqlDatabase: QMYSQL driver not loaded
QSqlDatabase: available drivers: QSQLITE QMYSQL QMYSQL3 QODBC QODBC3 QPSQL QPSQL7
QSqlQuery::exec: database not open
我拷背sqldrivers等等办法也试过了，不行～～

0 2014-04-08 15:31:57

只看TA 引用举报 #4 得分 0

终于编译好了qt的oracle驱动QOCI,连接driver not loaded解决方法我想你和我一样，照着

⋅此用户还没有发表过任何帖子 关注私聊空间博客 u010871742 本版专家分：20: 引用 4 楼 MMX 的回复:
我是可能编译通过，但总是打不开mysql显示：QSqlDatabase: QMYSQL driver not loaded
QSqlDatabase: available drivers: QSQLITE QMYSQL QMYSQL3 QODBC QODBC3 QPSQL QPSQL7
QSqlQuery::exec: database not open
我拷背sqldrivers等等办法也试过了，不行～～

你这说明驱动已经有了。
你试着把mysql安装目录中的libmysql.dll文件拷贝到 QT的安装目录下的这个文件夹试试 D:\Qt\Qt5.2.1\5.2.1\msvc2012_64\bin

0 2014-05-17 11:01:11

只看TA 引用举报 #5 得分 0

⋅FOJ 1706 括号表达式

⋅单词查询问题

⋅foj日历问题

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RiweiChen

本版专家分：0

GitHub 绑定GitHub第三方账户获取: 我也遇到楼上这种问题，
QSqlDatabase: QMYSQL driver not loaded
QSqlDatabase: available drivers: QSQLITE QMYSQL QMYSQL3 QODBC QODBC3 QPSQL QPSQL7

第一次以为是Mysql路径有空格不行，重装，然后还是同样的错误，已经把J:\MySQL\MySQL Server 5.6\lib 中的libmysql.dll 拷贝到了QT的目录J:\Qt\Qt5.3.1\5.3\mingw482_32\bin 下，还是一样的错误~~抓狂啊~

0 2014-08-12 21:17:54

只看TA 引用举报 #6 得分 0

qt5.2版本连接mysql问题？？代码如下：rnint main(int argc, char *argv[])rnrn QCoreApplication a(argc, argv);rn QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");rn db.setHostName("localhost");rn db.setDatabaseName("study");rn db.setUserName("root");rn db.setPassword("123");rn if(!db.open())rn rn qDebug()<< "unable to open database";rn rn elsern qDebug()<< "database connection established!!";rnrn return a.exec();rnrnrn执行之后为何显示这样的错误：rn[color=#FF6600][color=#FF0000]QSqlDatabase: QMYSQL driver not loadedrnQSqlDatabase: available drivers: QSQLITErnunable to open database[/color][/color] rn求解。。。

⋅FOJ 1706 括号表达式

⋅单词查询问题

⋅foj日历问题

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RiweiChen

本版专家分：0

GitHub 绑定GitHub第三方账户获取: 引用 6 楼 chenriwei2 的回复:
我也遇到楼上这种问题，
QSqlDatabase: QMYSQL driver not loaded
QSqlDatabase: available drivers: QSQLITE QMYSQL QMYSQL3 QODBC QODBC3 QPSQL QPSQL7

第一次以为是Mysql路径有空格不行，重装，然后还是同样的错误，已经把J:\MySQL\MySQL Server 5.6\lib 中的libmysql.dll 拷贝到了QT的目录J:\Qt\Qt5.3.1\5.3\mingw482_32\bin 下，还是一样的错误~~抓狂啊~
我的最新的Qt 5.3.1 ，自带驱动的那种

0 2014-08-12 21:18:40

只看TA 引用举报 #7 得分 0

为什么连接不上mysql 异常信息： 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 'add, cq, czzhzh, Dac, dqrq, hm, jgm, jxbz, jyrq, khrq, kzz, qxr, qxrrcye, sjyrq,' at line 1rnrnrn 表结构：rn [code=Java]rn DROP TABLE IF EXISTS `dlxmxdjb`;rn CREATE TABLE `dlxmxdjb` (rn `zh` varchar(30) NOT NULL DEFAULT '' COMMENT '子分户账户',rn `czzhzh` varchar(30) CHARACTER SET gbk NOT NULL DEFAULT '' COMMENT '财政专户帐号',rn `sjzh` varchar(30) CHARACTER SET gbk NOT NULL DEFAULT '' COMMENT '上级账户',rn `jgm` varchar(20) CHARACTER SET gbk NOT NULL DEFAULT '' COMMENT '所属机构码',rn `hm` varchar(100) CHARACTER SET gbk NOT NULL DEFAULT '' COMMENT '户名',rn `add` varchar(100) CHARACTER SET gbk NOT NULL DEFAULT '' COMMENT '地址',rn `ye` decimal(16,2) NOT NULL DEFAULT '0.00' COMMENT '余额',rn `zrye` decimal(16,2) NOT NULL DEFAULT '0.00' COMMENT '昨日余额',rn `qxrrcye` decimal(16,2) NOT NULL DEFAULT '0.00' COMMENT '起息日日初余额',rn `zjlb` char(2) CHARACTER SET gbk NOT NULL DEFAULT '' COMMENT '开户证件类别',rn `zjh` varchar(20) CHARACTER SET gbk NOT NULL DEFAULT '' COMMENT '开户证件号',rn `khrq` date DEFAULT NULL COMMENT '开户日期',rn `xhrq` date DEFAULT NULL COMMENT '销户日期',rn `jyrq` date DEFAULT NULL COMMENT '交易日期',rn `qxr` date DEFAULT NULL COMMENT '起息日',rn `jxbz` char(2) CHARACTER SET gbk NOT NULL DEFAULT '' COMMENT '计息标志',rn `zhnll` decimal(16,2) NOT NULL DEFAULT '0.00' COMMENT '账户年利率',rn `cq` char(2) CHARACTER SET gbk NOT NULL DEFAULT '' COMMENT '账户存期',rn `dqrq` date DEFAULT NULL COMMENT '到期日期',rn `sjyye` decimal(16,2) NOT NULL DEFAULT '0.00' COMMENT '上次交易余额',rn `sjyrq` date DEFAULT NULL COMMENT '上次交易日期',rn `kzz` char(100) CHARACTER SET gbk NOT NULL DEFAULT '' COMMENT '帐号控制字',rn `Dac` varchar(100) CHARACTER SET gbk NOT NULL DEFAULT ' ' COMMENT 'DAC',rn PRIMARY KEY (`zh`),rn UNIQUE KEY `Pindex_dlxmxdjb` (`zh`)rn ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='利息明细登记表';rn [/code]rnrn 网上查了一下有一个和我出现了一样的错误是因为字段中有MySQL的关键字我找不到是哪一个

⋅此用户还没有发表过任何帖子 关注私聊空间博客 zjw761481935 本版专家分：0: 引用 4 楼 MMX 的回复:
我是可能编译通过，但总是打不开mysql显示：QSqlDatabase: QMYSQL driver not loaded
QSqlDatabase: available drivers: QSQLITE QMYSQL QMYSQL3 QODBC QODBC3 QPSQL QPSQL7
QSqlQuery::exec: database not open
我拷背sqldrivers等等办法也试过了，不行～～

解决了没？

0 2014-12-17 20:16:41

只看TA 引用举报 #8 得分 0

为什么连接不上MYSQL 第一次写PHP 即遇到困惑郁闷rnrn以上程序运行时一片空白什么都没有rn其他一般的PHP程序可以运行的rnrn发生了什么事？？

yingzi_4773 本版专家分：0: 大神们，解决了吗？求方法啊…………

0 2016-09-21 21:51:04

只看TA 引用举报 #9 得分 0

再看看，为什么链接不上呢？ <%rn rs.PageSize =5 '每页记录条数rn iCount=rs.RecordCount '记录总数rn iPageSize=rs.PageSizern maxpage=rs.PageCount '总页数rn page=request("page")rn per_page=rs.PageSizern rn if Not IsNumeric(page) or page="" thenrn page=1rn elsern page=cint(page)rn end ifrn rn if page<1 thenrn page=1rn elseif page>maxpage thenrn page=maxpagern end ifrn rn rs.AbsolutePage=pagernrn if page=maxpage thenrn x=iCount-(maxpage-1)*iPageSizern elsern x=iPageSizern end ifrn%>rnrn'调用函数rnrn<%rn call PageControl(page,maxpage,per_page)rn%>rnrnrn‘函数代码rn<%rnSub PageControl(page,maxpage,per_page)rn'生成上一页下一页链接rn rn if page<=1 thenrn Response.Write ("首页 " & vbCrLf) rn Response.Write ("上页 " & vbCrLf)rn else rn page=page-1rnrn Response.Write("首页"& vbCrLf)rn Response.Write("上页 "& vbCrLf)rn end ifrnrn if page>=pagecount thenrn Response.Write ("下页 " & vbCrLf)rn Response.Write ("尾页 " & vbCrLf) rn elsern Response.Write("下页 " & vbCrLf)rn Response.Write("尾页 " & vbCrLf) rn end ifrnrn Response.Write(" 页次：" & page & "/共" & maxpage & "页" & vbCrLf)rn Response.Write(" 共" & iCount & "条/每页"&per_page&"条" & vbCrLf)rn rnEnd Subrn%>rnrnrnrnrn再看看，为什么链接不上呢？rn rn

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PHP连接不上mysql: rnrn应该没什么问题吧，可是怎么一直报错，ACCESS DENIEDrnrn";rn$amount_sql = "SELECT MAX(PATH_ID) FROM pathwayrn LIMIT 1;";rn$result_amount = mysql_query($amount_sql);rn$pathway_array = mysql_fetch_assoc($result_amount);rn$pathway_amount = $pathway_array['PATH_ID'];rn?>rn下面为报错的内容！rnWarning: mysql_query() [function.mysql-query]: Access denied for user 'ODBC'@'localhost' (using password: NO) in C:\xampp\htdocs\pathway\colon bacillus system.php on line 36rnrnWarning: mysql_query() [function.mysql-query]: A link to the server could not be established in C:\xampp\htdocs\pathway\colon bacillus system.php on line 36rnrnWarning: mysql_fetch_assoc() expects parameter 1 to be resource, boolean given in C:\xampp\htdocs\pathway\colon bacillus system.php on line 37

mysql一直连接不上: 我昨天写的php还可以对mysql进行操作，今天重启电脑以后就一直显示unable to connectrn

hive连接不上mysql: 请问hive连接mysql出现这个错误是什么原因？rn[img=https://img-bbs.csdn.net/upload/201704/13/1492074653_934022.jpg][/img]

局域网连接不上mysql: 我用Navicat连接局域网的mysql，出现错误：Host：192.168.1.240 is not allowed to connect to this mysql serverrn192.168.1.240 进入客户端，修改了mysql数据库中user表的user=root的host为%，还是不行。在我的电脑上telnet 192.168.1.240 3306 出现了一下错误：192.168.1.188 is not allowed to connect to this mysql serverrn失去了跟主机的联系。rnrnrn请问高手这个改怎么解决。我现在用Navicat连不上这个数据库了

phpmyadmin连接不上mysql: 环境：windows2003+IIS6+mysql6+phpmyadmin10.1rnrnmysql已经安装好，并能在命令行下正常登录使用；rnrn rn显示有内容rnrn rn显示成功；rnrnrnrn但phpmyadmin出现以下结果：rn____________________________________________________________________rn欢迎使用 phpMyAdmin 2.10.1rnrnphpMyAdmin 试图连接到 MySQL 服务器，但服务器拒绝连接。您应该检查 config.inc.php 中的主机、用户名和密码，并且确定这些信息与 MySQL 服务器的管理员所给出的信息一致。rnrn错误rnMySQL 返回： rnrn#1045 - Access denied for user 'root'@'localhost' (using password: NO) rn____________________________________________________________________rnrn但config.inc.php我已经设置完了，填写都应该是正确的。rnrnrn rnrnrn

MySQL外网连接不上: 遇到如上问题，一直以为是root帐号没有远程访问的权限。可是修改了user表里面的root的Host为%并没有暖用。找了很久原因，用netstat -tunlp命令看了下监听的端口情况发现： tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN 8954/mysqld

（急）mySQL连接不上？: 调试程序时出现了下面的问题：（MySQL服务是启动了的）rnrnrnWarning: mysql_connect() [function.mysql-connect]: Can't connect to MySQL server on 'localhost' (10061) in D:\MYOA\webroot\liuyanban\index.php on line 2rnrnWarning: mysql_select_db() [function.mysql-select-db]: Access denied for user: 'ODBC@localhost' (Using password: NO) in D:\MYOA\webroot\liuyanban\index.php on line 3rnrnWarning: mysql_select_db() [function.mysql-select-db]: A link to the server could not be established in D:\MYOA\webroot\liuyanban\index.php on line 3rnrnWarning: mysql_query() [function.mysql-query]: Access denied for user: 'ODBC@localhost' (Using password: NO) in D:\MYOA\webroot\liuyanban\index.php on line 4rnrnWarning: mysql_query() [function.mysql-query]: A link to the server could not be established in D:\MYOA\webroot\liuyanban\index.php on line 4rnrnWarning: mysql_query() [function.mysql-query]: Access denied for user: 'ODBC@localhost' (Using password: NO) in D:\MYOA\webroot\liuyanban\index.php on line 6rnrnWarning: mysql_query() [function.mysql-query]: A link to the server could not be established in D:\MYOA\webroot\liuyanban\index.php on line 6rnrnWarning: mysql_fetch_object(): supplied argument is not a valid MySQL result resource in D:\MYOA\webroot\liuyanban\index.php on line 7rn

php连接不上mysql: 使用下面语句测试，结果浏览器什么也不显示rnrn';rnif(mysqli_connect_errno())rnrn echo "连接失败";rnrnrnelsern echo "连接成功";rn$link->close();rn?>rnrn

eclpise连接不上mysql: 七月 25, 2017 5:33:54 下午 org.apache.tomcat.util.digester.SetPropertiesRule beginn警告: [SetPropertiesRule]Server/Service/Engine/Host/Context Setting property 'source' to 'org.eclipse.jst.jee.server:1' did not find a matching property.n七月 25, 2017 5:33:54 下午 org.apache.catalina.startup.VersionLoggerListener logn信息: Server version: Apache Tomcat/9.0.0.M21n七月 25, 2017 5:33:54 下午 org.apache.catalina.startup.VersionLoggerListener logn信息: Server built: May 4 2017 22:42:36 UTCn七月 25, 2017 5:33:54 下午 org.apache.catalina.startup.VersionLoggerListener logn信息: Server number: 9.0.0.0n七月 25, 2017 5:33:54 下午 org.apache.catalina.startup.VersionLoggerListener logn信息: OS Name: Windows 10n七月 25, 2017 5:33:54 下午 org.apache.catalina.startup.VersionLoggerListener logn信息: OS Version: 10.0n七月 25, 2017 5:33:54 下午 org.apache.catalina.startup.VersionLoggerListener logn信息: Architecture: x86n七月 25, 2017 5:33:54 下午 org.apache.catalina.startup.VersionLoggerListener logn信息: Java Home: C:\Program Files\Java\jre1.8.0_131n七月 25, 2017 5:33:54 下午 org.apache.catalina.startup.VersionLoggerListener logn信息: JVM Version: 1.8.0_131-b11n七月 25, 2017 5:33:54 下午 org.apache.catalina.startup.VersionLoggerListener logn信息: JVM Vendor: Oracle Corporationn七月 25, 2017 5:33:54 下午 org.apache.catalina.startup.VersionLoggerListener logn信息: CATALINA_BASE: E:\Java 项目\.metadata\.plugins\org.eclipse.wst.server.core\tmp0n七月 25, 2017 5:33:54 下午 org.apache.catalina.startup.VersionLoggerListener logn信息: CATALINA_HOME: F:\java web\apache-tomcat-9.0.0.M21n七月 25, 2017 5:33:54 下午 org.apache.catalina.startup.VersionLoggerListener logn信息: Command line argument: -Dcatalina.base=E:\Java 项目\.metadata\.plugins\org.eclipse.wst.server.core\tmp0n七月 25, 2017 5:33:54 下午 org.apache.catalina.startup.VersionLoggerListener logn信息: Command line argument: -Dcatalina.home=F:\java web\apache-tomcat-9.0.0.M21n七月 25, 2017 5:33:54 下午 org.apache.catalina.startup.VersionLoggerListener logn信息: Command line argument: -Dwtp.deploy=E:\Java 项目\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebappsn七月 25, 2017 5:33:54 下午 org.apache.catalina.startup.VersionLoggerListener logn信息: Command line argument: -Djava.endorsed.dirs=F:\java web\apache-tomcat-9.0.0.M21\endorsedn七月 25, 2017 5:33:54 下午 org.apache.catalina.startup.VersionLoggerListener logn信息: Command line argument: -Dfile.encoding=UTF-8n七月 25, 2017 5:33:54 下午 org.apache.catalina.core.AprLifecycleListener lifecycleEventn信息: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [C:\Program Files\Java\jre1.8.0_131\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:/Program Files/Java/jre1.8.0_131/bin/client;C:/Program Files/Java/jre1.8.0_131/bin;C:/Program Files/Java/jre1.8.0_131/lib/i386;C:\ProgramData\Oracle\Java\javapath;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files\Intel\OpenCL SDK\3.0\bin\x86;C:\Program Files\Windows Kits\8.1\Windows Performance Toolkit\;C:\Program Files\Microsoft SQL Server\110\Tools\Binn\;C:\Program Files\Microsoft SDKs\TypeScript\1.0\;C:\Program Files\Microsoft SQL Server\100\Tools\Binn\;C:\Program Files\Microsoft SQL Server\100\DTS\Binn\;C:\Program Files\Microsoft SQL Server\100\Tools\Binn\VSShell\Common7\IDE\;C:\Program Files\MySQL\MySQL Server 5.7\bin;C:\Program Files\Java\jdk1.8.0_131\bin;C:\Program Files\Java\jdk1.8.0_131\jre\bin;F:\eclipse;;.]n七月 25, 2017 5:33:54 下午 org.apache.coyote.AbstractProtocol initn信息: Initializing ProtocolHandler ["http-nio-8181"]n七月 25, 2017 5:33:55 下午 org.apache.tomcat.util.net.NioSelectorPool getSharedSelectorn信息: Using a shared selector for servlet write/readn七月 25, 2017 5:33:55 下午 org.apache.coyote.AbstractProtocol initn信息: Initializing ProtocolHandler ["ajp-nio-8009"]n七月 25, 2017 5:33:55 下午 org.apache.tomcat.util.net.NioSelectorPool getSharedSelectorn信息: Using a shared selector for servlet write/readn七月 25, 2017 5:33:55 下午 org.apache.catalina.startup.Catalina loadn信息: Initialization processed in 1874 msn七月 25, 2017 5:33:55 下午 org.apache.catalina.core.StandardService startInternaln信息: Starting service [Catalina]n七月 25, 2017 5:33:55 下午 org.apache.catalina.core.StandardEngine startInternaln信息: Starting Servlet Engine: Apache Tomcat/9.0.0.M21n七月 25, 2017 5:33:55 下午 org.apache.coyote.AbstractProtocol startn信息: Starting ProtocolHandler ["http-nio-8181"]n七月 25, 2017 5:33:55 下午 org.apache.coyote.AbstractProtocol startn信息: Starting ProtocolHandler ["ajp-nio-8009"]n七月 25, 2017 5:33:55 下午 org.apache.catalina.startup.Catalina startn信息: Server startup in 920 msnjava.lang.ClassNotFoundException: com.mysql.jdbc.Drivern at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1275)n at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1109)n at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:123)n at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:60)n at java.lang.Class.forName0(Native Method)n at java.lang.Class.forName(Unknown Source)n at org.apache.jsp.AddBook_jsp._jspService(AddBook_jsp.java:137)n at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)n at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)n at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:443)n at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)n at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)n at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)n at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)n at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)n at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)n at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)n at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)n at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)n at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)n at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:475)n at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)n at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)n at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624)n at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)n at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)n at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:498)n at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)n at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:796)n at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1366)n at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)n at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)n at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)n at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)n at java.lang.Thread.run(Unknown Source)n

python2 连接不上MySQL: import MySQLdbrnimport osrnimport sysrnreload(sys)rnsys.setdefaultencoding('utf-8')rnrnconn=MySQLdb.connect(host="127.0.0.1",port=3306,user="root",passwd="697090",db="traffic",charset="utf8")rnrnrnOperationalError Traceback (most recent call last)rn in ()rn 1 rn-- 2 conn=MySQLdb.connect(host="127.0.0.1",port=3306,user="root",passwd="697090",db="traffic",charset="utf8")rnrnD:\softsetup\Anaconda2\lib\site-packages\MySQLdb\__init__.pyc in Connect(*args, **kwargs)rn 79 """Factory function for connections.Connection."""rn 80 from MySQLdb.connections import Connectionrn- 81 return Connection(*args, **kwargs)rn 82 rn 83 connect = Connection = ConnectrnrnD:\softsetup\Anaconda2\lib\site-packages\MySQLdb\connections.pyc in __init__(self, *args, **kwargs)rn 191 autocommit = kwargs2.pop('autocommit', False)rn 192 rn 193 super(Connection, self).__init__(*args, **kwargs2)rn 194 self.cursorclass = cursorclassrn 195 self.encoders = dict([ (k, v) for k, v in conv.items()rnrnOperationalError: (1251, 'Client does not support authentication protocol requested by server; consider upgrading MySQL client')rn

本机的mysql连接不上？: 本机的mysql数据库已建好，服务也开了，可是用下面的代码连接却失败，请问是什么原因？rn rn Class.forName("com.mysql.jdbc.Driver");rn Connection con1=DriverManager.getConnection("jdbc:mysql://localhost:3306/cel","root","");rnrn运行时抛出这个异常：java.sql.SQLException: Communication link failure: Bad handshakernrnrn

MySQL总是连接不上: MySQL 4.1.13+win2003+apache2+php rn 数据库总是出现连接不上的，运行SHOW STATUS语句 Connections 的值一直在增加，max_Connections已经改到最大了，mysql错误提示：mysql服务器挂起，wait timeout值为3600！rn请问有没有遇到同样情况的朋友，请达人赐教！

连接Mysql数据库连接不上?: On Error GoTo err1rn Dim GConn As ADODB.Connectionrn Set GConn = New ADODB.Connectionrn Dim lRs As ADODB.Recordset '数据库记录集对象rn Set lRs = New ADODB.Recordsetrn rn GConn.CursorLocation = adUseClientrn GConn.ConnectionString = "DRIVER=MySQL ODBC 3.51 Driver;SERVER=localhost; DATABASE=test;UID=root;PWD=123456; OPTION=3"rnrn GConn.Openrnrn MsgBox "连接成功"rn exit subrnErr1rn MsgBox "连接失败"rnrnrn会出现 [Microsoft][ODBC 驱动程序管理器] 未发现数据源名称并且未指定默认驱动程序rnrn请问是否是我安装的mysql中,没有安装它的直接连接数据库的驱动程序rn我在ODBC中,想添加一个ODBC,但确实没有发现它有任何带有mysql之类的字符串rn请问如何解决这个问题?谢谢!

MyEclipse连接不上MySQL?: [img=https://img-bbs.csdn.net/upload/201408/28/1409225509_517978.jpg][/img]rnrn做bbs项目的时候 MyEclipse连接不上数据库，各位大神，麻烦帮我看看这是什么原因？

Mysql连接不上数据库问题: 今天连接Mysql数据库的时候出现一个问题，现在把解决方法拿出来，避免以后出现同样的问题，也为遇到同样问题的伙伴提供一个思路。 问题如下：解决方法是进入mysql的mysql库中的user表，修改Host字段为%即可。当然，记得重启一下mysql服务。 ...

MYSQL连接不上（LINUX）: [root@test bin]# mysql -u root -h 192.168.0.100 -prnEnter password: ******rnERROR 1130: Host 'test.*****.net' is not allowed to connect to this MySQL serverrnrn其中MYSQL在192.168.0.100 上已经安装好了，并且已经启动了

连接不上mysql的原因: 我用的是windows2000 professional，mysql可以正常运行，但php就是连接不上。显示rnWarning: mysql_pconnect(): Can't create TCP/IP socket (10106) rn用telnet hostname 3306 显示connection to host lose(遗失到主机的连接），这说明mysql没有运行在3306端口上，请问这是什么原因，应如何解决？

MySQL 8.0 连接不上: 问题 最近使用数据库操作比较多，使用了JetBrain 家的 DataGrip 去连接数据库，但发现无论如何连接不上，但之前在 IDEA 里是没有问题的。经过排查后，原因在于没有指定时区，MySQL 8时区参数是必选的，没有时区会连接不了。解决方法解决方法是添加一个参数 serverTimeZone=UTC JDBC URL 为 jdbc:mysql://192.168.200.238:33...

为什么连接不上呢？？数据库连接的问题　在线等ing．．．．．．: 昨天把以前做的一个图书管理系统后台用的ＳＱＬ２０００　我用的是台公式机器　但是今天我在我的笔记本里面同样是装了ＳＱＬ２０００然后运行ＰＢ编写的程序　但是就是运行不起来这是怎么回事？？小弟弟焦急等待　谢谢大家帮忙ing　．．．．．．．

用java连接mysql为什么连接不上啊？: package wyf.fg;rnimport java.sql.*;rnpublic class queryData rn /**rn * @param argsrn */rn public static void main(String[] args) rn // TODO Auto-generated method stubrn Connection con=null;rn Statement stmt;rn ResultSet rs;rn String sqlString="select* from student";rn String sd;rn tryrn Class.forName("com.mysql.jdbc.Driver");rn con=DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","123456");rn stmt=con.createStatement();rn rs=stmt.executeQuery(sqlString);rn while(rs.next())rn sd=rs.getString(1);rn System.out.println(sd);rn rn //System.out.print");rn catch(Exception e)rn e.printStackTrace();rn finallyrn tryrn con.close();rn catch(SQLException e)rn e.printStackTrace();rn rn rnrnrn不可以截图，就复制了下来，向大家帮帮忙啊，研究了几天了。。用的连接包也没有显示版本。。

安装mysql到d:\mysql,为什么连接不上？: 安装之后，只能把服务mysqld-nt重新安装一遍，才能使用，再重启又不能用了，虽然服务能启动，但命令都识别不出来，my.ini、my.cnf我都配置成了实际安装路径，怎么还这样？

QT5.2连接Oracle数据库失败: int main(int argc, char *argv[])rnrn QApplication a(argc, argv);rnrn //连接数据库rn QSqlDatabase db = QSqlDatabase::addDatabase("QOCI");rn// db.setPort(1251);rn db.setHostName("127.0.0.1");rn db.setDatabaseName("CRMDB");rn db.setUserName("abc");//用户名rn db.setPassword("abc123");//密码rn if (db.open()) rn qDebug()<< "链接数据库成功";rn elsern qDebug()<< "链接数据库失败";rn return 0;rn rn return a.exec();rnrnrn//总是连接数据库失败，是设置错了还是怎样，应该怎么写，各个设置是什么意思

Navicat连接不上远端Mysql问题: 新装了一个虚拟机，上面装了mysql，遇到远程无法登陆的问题。通过以下方法解决了这个问题。 1.首先进入mysql ./mysql -u -root -p 2.赋予任何主机访问数据库的权限 mysql&gt;GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' WITH GRANT OPTION; mysql&gt;FLUSH PRIV...

新手关于连接不上mysql的问题: 代码是这样的包括mysql[img=https://img-bbs.csdn.net/upload/201805/09/1525832338_861278.png][/img]rn但是一直出这个错误[img=https://img-bbs.csdn.net/upload/201805/09/1525832375_574465.png][/img]rnrnmysql是8.0.11.想问问是哪里有问题 谢谢

关于kettle连接不上mysql的问题: 首次使用kettle，在连接mysql后测试一下出现一下错误，请求帮住解决，谢谢了！rnrn错误连接数据库 [jrd] : org.pentaho.di.core.exception.KettleDatabaseException: rnError occurred while trying to connect to the databasernrnError connecting to database: (using class org.gjt.mm.mysql.Driver)rnCommunications link failurernrnThe last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.rnrnrnorg.pentaho.di.core.exception.KettleDatabaseException: rnError occurred while trying to connect to the databasernrnError connecting to database: (using class org.gjt.mm.mysql.Driver)rnCommunications link failurernrnThe last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.rnrnrn at org.pentaho.di.core.database.Database.normalConnect(Database.java:472)rn at org.pentaho.di.core.database.Database.connect(Database.java:370)rn at org.pentaho.di.core.database.Database.connect(Database.java:341)rn at org.pentaho.di.core.database.Database.connect(Database.java:331)rn at org.pentaho.di.core.database.DatabaseFactory.getConnectionTestReport(DatabaseFactory.java:80)rn at org.pentaho.di.core.database.DatabaseMeta.testConnection(DatabaseMeta.java:2795)rn at org.pentaho.ui.database.event.DataHandler.testDatabaseConnection(DataHandler.java:598)rn at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)rn at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)rn at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)rn at java.lang.reflect.Method.invoke(Unknown Source)rn at org.pentaho.ui.xul.impl.AbstractXulDomContainer.invoke(AbstractXulDomContainer.java:313)rn at org.pentaho.ui.xul.impl.AbstractXulComponent.invoke(AbstractXulComponent.java:157)rn at org.pentaho.ui.xul.impl.AbstractXulComponent.invoke(AbstractXulComponent.java:141)rn at org.pentaho.ui.xul.swt.tags.SwtButton.access$500(SwtButton.java:43)rn at org.pentaho.ui.xul.swt.tags.SwtButton$4.widgetSelected(SwtButton.java:137)rn at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source)rn at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)rn at org.eclipse.swt.widgets.Display.sendEvent(Unknown Source)rn at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)rn at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)rn at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)rn at org.eclipse.jface.window.Window.runEventLoop(Window.java:820)rn at org.eclipse.jface.window.Window.open(Window.java:796)rn at org.pentaho.di.ui.xul.KettleDialog.show(KettleDialog.java:80)rn at org.pentaho.di.ui.xul.KettleDialog.show(KettleDialog.java:47)rn at org.pentaho.di.ui.core.database.dialog.XulDatabaseDialog.open(XulDatabaseDialog.java:116)rn at org.pentaho.di.ui.core.database.dialog.DatabaseDialog.open(DatabaseDialog.java:60)rn at org.pentaho.di.ui.trans.step.BaseStepDialog.showDbDialogUnlessCancelledOrValid(BaseStepDialog.java:779)rn at org.pentaho.di.ui.trans.step.BaseStepDialog$AddConnectionListener.widgetSelected(BaseStepDialog.java:1374)rn at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source)rn at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)rn at org.eclipse.swt.widgets.Display.sendEvent(Unknown Source)rn at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)rn at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)rn at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)rn at org.pentaho.di.ui.trans.steps.tableinput.TableInputDialog.open(TableInputDialog.java:436)rn at org.pentaho.di.ui.spoon.delegates.SpoonStepsDelegate.editStep(SpoonStepsDelegate.java:127)rn at org.pentaho.di.ui.spoon.Spoon.editStep(Spoon.java:8789)rn at org.pentaho.di.ui.spoon.trans.TransGraph.editStep(TransGraph.java:3179)rn at org.pentaho.di.ui.spoon.trans.TransGraph.mouseDoubleClick(TransGraph.java:775)rn at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source)rn at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)rn at org.eclipse.swt.widgets.Display.sendEvent(Unknown Source)rn at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)rn at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)rn at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)rn at org.pentaho.di.ui.spoon.Spoon.readAndDispatch(Spoon.java:1359)rn at org.pentaho.di.ui.spoon.Spoon.waitForDispose(Spoon.java:7990)rn at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:9290)rn at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:685)rn at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)rn at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)rn at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)rn at java.lang.reflect.Method.invoke(Unknown Source)rn at org.pentaho.commons.launcher.Launcher.main(Launcher.java:92)rnCaused by: org.pentaho.di.core.exception.KettleDatabaseException: rnError connecting to database: (using class org.gjt.mm.mysql.Driver)rnCommunications link failurernrnThe last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.rnrn at org.pentaho.di.core.database.Database.connectUsingClass(Database.java:585)rn at org.pentaho.di.core.database.Database.normalConnect(Database.java:456)rn ... 55 morernCaused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failurernrnThe last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.rn at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)rn at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)rn at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)rn at java.lang.reflect.Constructor.newInstance(Unknown Source)rn at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)rn at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:981)rn at com.mysql.jdbc.MysqlIO.(MysqlIO.java:339)rn at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2253)rn at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2286)rn at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2085)rn at com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:795)rn at com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:44)rn at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)rn at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)rn at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)rn at java.lang.reflect.Constructor.newInstance(Unknown Source)rn at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)rn at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:400)rn at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:327)rn at java.sql.DriverManager.getConnection(Unknown Source)rn at java.sql.DriverManager.getConnection(Unknown Source)rn at org.pentaho.di.core.database.Database.connectUsingClass(Database.java:567)rn ... 56 morernCaused by: java.net.ConnectException: Connection refused: connectrn at java.net.DualStackPlainSocketImpl.connect0(Native Method)rn at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)rn at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)rn at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)rn at java.net.AbstractPlainSocketImpl.connect(Unknown Source)rn at java.net.PlainSocketImpl.connect(Unknown Source)rn at java.net.SocksSocketImpl.connect(Unknown Source)rn at java.net.Socket.connect(Unknown Source)rn at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:211)rn at com.mysql.jdbc.MysqlIO.(MysqlIO.java:298)rn ... 71 morernrn主机名 : 127.0.0.1rn端口 : 3307rn数据库名:jrrnrn 我是通过SSH通道链接数据库的，之前是可以连接上的，过了一个周末回来后就莫名其妙不能连接了。rn 经过一番百度，说是需要把.jar包放到指定路径下，我也放了，还有说是mysql8小时的问题，我也重新设置并重启，结果还是一样，所以现在是真的不知道要怎么搞了，还请高手指教啊，在线等！rn kettle的版本是7.0.0.25，mysql的版本是5.7.17.0

JDBC连接不上mysql的问题: 下面是我的代码,请问是什么原因连接不上数据库,我想问一下是不是数据库存放的位子有关?rn请知道的速回!rnrnrnrnrnrn 登陆rnrnrnrn 登陆范例——用户名及密码固定rn rn rn rn rn rn rn rn rn rn rn rnrnrnrnrntomcat 6.0的rnmysql是5.0的驱动程序(mysql-connector-java-5.0.8-bin.jar)放在了lib下,并且还设置了classpath到mysql-connector-java-5.0.8-bin.jar这里了rn但是就是不知道是怎么搞还连接不上?rn请生长点的回答一下啊!

[求助] JSP连接不上MySQL的问题: 大家好，我试图连接MySQL数据库，但是始终出错，希望大家帮我找找原因。rn我的Java版本是jdk1.6.0_18，MySQL服务功能已经开了，JDBC驱动mysql-connector-java-5.0.4-bin.jar也已经放到了路径C:\apache-tomcat-6.0.26\lib下面。rn环境变量设置如下 rnCLASSPATH=.;C:\Java\jdk1.6.0_18\;C:\apache-tomcat-6.0.26\;C:\apache-tomcat-6.0.26\lib\servlet-api.jar;C:\apache-tomcat-6.0.26\lib\mysql-connector-java-5.0.4-bin.jar;C:\apache-tomcat-6.0.26\lib\mysql-connector-java-3.1.11-bin.jarrnrnMysql的用户名和密码应该也没错，我用select user();查看到用户是root@localhost,同时密码也是我进入mysql界面时输入的密码。rnrn测试代码test.jsp如下rnrnrnrnrn rnrn 管理页面rnrnrnrn rnrnrnrnrn程序中如果去掉“Connection conn= DriverManager.getConnection(url); ”则一切正常，没有报错，但是有了那句就出现错误信息，所以我觉得JDBC驱动应该没有出错，连接部分有问题。rnrn错误信息，Exception 如下：rn出现例外，信息是:Server connection failure during transaction. Due to underlying exception: 'java.net.SocketException: java.net.ConnectException: Connection refused: connect'. ** BEGIN NESTED EXCEPTION ** java.net.SocketException MESSAGE: java.net.ConnectException: Connection refused: connect STACKTRACE: java.net.SocketException: java.net.ConnectException: Connection refused: connect at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:156) at com.mysql.jdbc.MysqlIO.(MysqlIO.java:276) at com.mysql.jdbc.Connection.createNewIO(Connection.java:2815) at com.mysql.jdbc.Connection.(Connection.java:1531) at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266) at java.sql.DriverManager.getConnection(DriverManager.java:582) at java.sql.DriverManager.getConnection(DriverManager.java:207) at org.apache.jsp.manage_jsp._jspService(manage_jsp.java:85) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Thread.java:619) ** END NESTED EXCEPTION ** Attempted reconnect 3 times. Giving up.

为什么mount不上呢: mount /dev/hda? /mnt/d 或者rnmount /dev/hdb? /mnt/drn试了很多次,都不行,怎么回事阿?

为什么连接不上mysql数据库？: 以前项目的mysql驱动包是mysql-2.0.4.jar,我现在的数据库用的是mysql5.0,换了驱动包mysql-connector-java-5.0.8-bin.jar,还是连接不上出现异常： Cannot create PoolableConnectionFactory (Communication failure during handshake. Is there a server running on localhost:3306?)，请问各位怎么解决？？？

为什么总是连接不上？: “/StudentSys”应用程序中的服务器错误。rn--------------------------------------------------------------------------------rnrn用户 'sa' 登录失败。 rn说明: 执行当前 Web 请求期间，出现未处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。 rnrn异常详细信息: System.Data.OleDb.OleDbException: 用户 'sa' 登录失败。rnrn源错误: rnrnrn行 148： //创建一个联结实例rn行 149： Connection = new OleDbConnection(sConnectionString);rn行 150： Connection.Open();rn行 151： rn行 152： rn rnrn源文件: c:\inetpub\wwwroot\studentsys\module\ccutility.cs 行: 150 rnrn堆栈跟踪: rnrnrn[OleDbException (0x80040e4d): 用户 'sa' 登录失败。]rn System.Data.OleDb.OleDbConnection.ProcessResults(Int32 hr)rn System.Data.OleDb.OleDbConnection.InitializeProvider()rn System.Data.OleDb.OleDbConnection.Open()rn StudentSys.Module.CCUtility.DBOpen() in c:\inetpub\wwwroot\studentsys\module\ccutility.cs:150rn StudentSys.Module.CCUtility..ctor(Object parent) in c:\inetpub\wwwroot\studentsys\module\ccutility.cs:68rn StudentSys.Default.Page_Load(Object sender, EventArgs e) in c:\inetpub\wwwroot\studentsys\default.cs:91rn System.Web.UI.Control.OnLoad(EventArgs e)rn System.Web.UI.Control.LoadRecursive()rn System.Web.UI.Page.ProcessRequestMain()rnrn rn

svn服务器为什么连接不上？: 告诉我说301错误？

为什么iis连接不上: Error connect to wen;rnThe System cannot find the path speciallyrnrn这个问题怎么解决啊？谢了！

为什么连接不上查询分析器: 我安装ＳＱＬ２０００时用的是windows身份验证，企业管理器可以正常打开　但连接查询分析器时不管是用windows身份验证还是ＳＱＬ　ＳＥＲＶＥＲ身份验证都连接不上　都是无法连接到服务器说ＳＱＬ　ＳＥＲＶＥＲ不存在或访问被拒绝　直接从企业管理器里面连接查询分析器可以连接上　　这是为什么啊

为什么连接不上？(Hibernate): Person.hbm.xmlrn rnrnrnrnrnrnrnrnrnrnrnrnrnrnrnhibernate.cfg.xmlrnrnrn rn net.sf.hibernate.dialect.MySQLDialectrn com.mysql.jdbc.Driverrn jdbc:mysql://localhost/Temprn chenleirn rnrn truernrn rn rn rnrnrnrn报错：rnD:\Borland\JBuilder2005\jdk1.4\bin\javaw -classpath "C:\Documents and Settings\Administrator\jbproject\TestHXML\classes;F:\陈磊备份\useinJbuilder\hibernatelib\ant-1.5.3.jar;F:\陈磊备份\useinJbuilder\hibernatelib\ant-optional-1.5.3.jar;F:\陈磊备份\useinJbuilder\hibernatelib\c3p0-0.8.3.jar;F:\陈磊备份\useinJbuilder\hibernatelib\cglib-2.0-rc2.jar;F:\陈磊备份\useinJbuilder\hibernatelib\commons-collections-2.1.jar;F:\陈磊备份\useinJbuilder\hibernatelib\commons-dbcp-1.1.jar;F:\陈磊备份\useinJbuilder\hibernatelib\commons-lang-1.0.1.jar;F:\陈磊备份\useinJbuilder\hibernatelib\commons-logging-1.0.3.jar;F:\陈磊备份\useinJbuilder\hibernatelib\commons-pool-1.1.jar;F:\陈磊备份\useinJbuilder\hibernatelib\concurrent-1.3.2.jar;F:\陈磊备份\useinJbuilder\hibernatelib\connector.jar;F:\陈磊备份\useinJbuilder\hibernatelib\dom4j-1.4.jar;F:\陈磊备份\useinJbuilder\hibernatelib\ehcache-0.6.jar;F:\陈磊备份\useinJbuilder\hibernatelib\jaas.jar;F:\陈磊备份\useinJbuilder\hibernatelib\jboss-cache.jar;F:\陈磊备份\useinJbuilder\hibernatelib\jboss-common.jar;F:\陈磊备份\useinJbuilder\hibernatelib\jboss-jmx.jar;F:\陈磊备份\useinJbuilder\hibernatelib\jboss-system.jar;F:\陈磊备份\useinJbuilder\hibernatelib\jcs-1.0-dev.jar;F:\陈磊备份\useinJbuilder\hibernatelib\jdbc2_0-stdext.jar;F:\陈磊备份\useinJbuilder\hibernatelib\jgroups-2.2.jar;F:\陈磊备份\useinJbuilder\hibernatelib\jta.jar;F:\陈磊备份\useinJbuilder\hibernatelib\junit-3.8.1.jar;F:\陈磊备份\useinJbuilder\hibernatelib\log4j-1.2.8.jar;F:\陈磊备份\useinJbuilder\hibernatelib\odmg-3.0.jar;F:\陈磊备份\useinJbuilder\hibernatelib\oscache-2.0.jar;F:\陈磊备份\useinJbuilder\hibernatelib\proxool-0.8.3.jar;F:\陈磊备份\useinJbuilder\hibernatelib\swarmcache-1.0rc2.jar;F:\陈磊备份\useinJbuilder\hibernatelib\xalan-2.4.0.jar;F:\陈磊备份\useinJbuilder\hibernatelib\xerces-2.4.0.jar;F:\陈磊备份\useinJbuilder\hibernatelib\xml-apis.jar;F:\陈磊备份\useinJbuilder\hibernate2.jar;D:\mysql driver\mysql-connector-java-3.0.14-production-bin.jar;F:\陈磊备份\useinJbuilder\logging-log4j-1.2.11.zip;D:\Borland\JBuilder2005\jdk1.4\jre\bin\JBuilder2005_c.jar;D:\Borland\JBuilder2005\jdk1.4\jre\javaws\javaws.jar;D:\Borland\JBuilder2005\jdk1.4\jre\lib\charsets.jar;D:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\dnsns.jar;D:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\ldapsec.jar;D:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\localedata.jar;D:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\sunjce_provider.jar;D:\Borland\JBuilder2005\jdk1.4\jre\lib\im\indicim.jar;D:\Borland\JBuilder2005\jdk1.4\jre\lib\im\thaiim.jar;D:\Borland\JBuilder2005\jdk1.4\jre\lib\jce.jar;D:\Borland\JBuilder2005\jdk1.4\jre\lib\jsse.jar;D:\Borland\JBuilder2005\jdk1.4\jre\lib\plugin.jar;D:\Borland\JBuilder2005\jdk1.4\jre\lib\rt.jar;D:\Borland\JBuilder2005\jdk1.4\jre\lib\sunrsasign.jar;D:\Borland\JBuilder2005\jdk1.4\lib\dt.jar;D:\Borland\JBuilder2005\jdk1.4\lib\htmlconverter.jar;D:\Borland\JBuilder2005\jdk1.4\lib\tools.jar" Temp.Client2 rnlog4j:WARN No appenders could be found for logger (net.sf.hibernate.cfg.Environment).rnrnlog4j:WARN Please initialize the log4j system properly.rnrnjava.lang.UnsupportedOperationException: The user must supply a JDBC connectionrnrn at net.sf.hibernate.connection.UserSuppliedConnectionProvider.getConnection(UserSuppliedConnectionProvider.java:32)rnrn at net.sf.hibernate.impl.BatcherImpl.openConnection(BatcherImpl.java:278)rnrn at net.sf.hibernate.impl.SessionImpl.connect(SessionImpl.java:3264)rnrn at net.sf.hibernate.impl.SessionImpl.connection(SessionImpl.java:3244)rnrn at net.sf.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:40)rnrn at net.sf.hibernate.transaction.JDBCTransactionFactory.beginTransaction(JDBCTransactionFactory.java:19)rnrn at net.sf.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:2195)rnrn at Temp.Client2.main(Client2.java:29)rnrnException in thread "main" rnrn小弟刚学Hibernate.为这个问题搞了2天了，还是解决不了。

为什么连接不上库函数？: 我用c++30编译了一个图形方面的程序。已经包含。但是就是连接不上他的函数。在c++30中是说“函数没定义”在vc中是说“打不开”是不是有其他的路径设置。应该怎么办？请大家帮我一下。谢谢。

为什么我的连接不上？: 主机：rn WSAData da;rn WSAStartup(0x0020,&da);rn rn CSocket s,r;rn if(0!=s.Create(5000))rn MessageBox("created");rn if(0!=s.Listen ())rn MessageBox("lisening");rn SOCKADDR_IN ra;rn int le=sizeof(ra);rn if(0!=s.Accept( r,(SOCKADDR*)&ra,&le))rn MessageBox("accepted");rn客户rn CSocket cc;rn cc.Create ();rn CString st=m_text_v;rn cc.Connect ("127.0.0.1",5000);rn cc.Send ("ajslkjdf",5);rn//////////////////////rn只是学习连接，但就是连接不上。线程被挂起了。

为什么SQLServer2000连接不上: 请问为什么连接SQLServer2000出现以下异常?MSSQL　2000 Service Pack 3a 和SQL Server 2000 Driver for JDBC Service Pack 3都已安装,但还是不行.非常紧急,请高手搞点,多谢啦rnrnjava.sql.SQLException: [Microsoft][SQLServer 2000 Driver for JDBC]Error establishing socket.rn at com.microsoft.jdbc.base.BaseExceptions.createException(Unknown Source)rn at com.microsoft.jdbc.base.BaseExceptions.getException(Unknown Source)rn at com.microsoft.jdbc.base.BaseExceptions.getException(Unknown Source)rn at com.microsoft.jdbc.sqlserver.tds.TDSConnection.(Unknown Source)rn at com.microsoft.jdbc.sqlserver.SQLServerImplConnection.open(Unknown Source)rn at com.microsoft.jdbc.base.BaseConnection.getNewImplConnection(Unknown Source)rn at com.microsoft.jdbc.base.BaseConnection.open(Unknown Source)rn at com.microsoft.jdbc.base.BaseDriver.connect(Unknown Source)rn at java.sql.DriverManager.getConnection(DriverManager.java:582)rn at java.sql.DriverManager.getConnection(DriverManager.java:185)

为什么客户端连接不上: 用了几年的Windows2003了，也用了好多年SQL Server，不过这个问题倒是头次遇到。下午朋友遇到个现象，在Win2003简体中文服务器版上安装SQL Server2000，默认安装，一切正常，但是在安装完成后查看端口，1433端口居然未开放，当然更不用说远程连接了。rn一般分析的都是这样：rn1、sql server服务没有启动；rn检查服务启动，重新启动服务故障依然。rn2、修改了端口号；rn打开网络实用工具，检查启用的协议中有TCP/IP协议，查看端口，是1433没错。rn3、客户端实用工具作了改动；rn打开客户端实用工具，检查协议端口正常，重新创建一个别名，依然不行。rn4、安装的问题；rn因为没有看他怎么安装的sql，怀疑安装步骤有问题。据张烨这个牛人讲，如果修改了默认的实例名，而又未正确配置，会出现这样的现象。遂卸载重装，一切默认，故障依然。rn5、安装版本的问题；rn查看安装光盘，是久经考验的安装盘，应该不会出问题。rn6、系统的问题；rn也看不出有什么其它的问题，难道是系统的问题？不过重装系统可太过麻烦，还是先想想其它的办法，看能不能找到问题所在。rnrnrn此种问题怎么解决呀,大哥门rnrnrn

为什么注册不上呢？: 我用MFC AppWizard 生成一个COM的DLL，但编译链接后无法注册到注册表，以致客户端程序无法调用。rn书上说是自动完成组件的注册，是哪处错了呢？

数据库为什么连接不上: 我用Microsoft Office Access 2003做了一个数据库。在VB6.0中添加了data和DBGrid控件，在DATA的属性设置里设置：caption=data1;connect=Access;databaseName=D:\My Documents\试验数据.mdb.可是运行就出现错误：Unrecognized database format'D:\My Documents\试验数据.mdb'。请问大家这是什么原因呀！我用VB的外部程序的VISUAL DATA Manager建造的数据源用上面的方法连接都很正常呀。rn连接Microsoft Office Access 2003的数据库要用什么控件呀？

为什么连接不上呀？: 我用winsocket编写为什么在我自己的机器上试能连上，而在上网以后和远程机器就连不上呀？(当然我知道一台与两台不一样)，可我以前用的CSocket可以的，请问可能是什么问题？rnBOOL InISock()rnrn /*rn #define WM_SOCK 280rn #define US_MAXSIZE 1024rn */rn //Variable Definern int Status;rn //WORD wMajorVersion,wMinorVersion;rn WORD wVersionReqd;rn WSADATA lpmyWSAData;rn wVersionReqd = MAKEWORD(1,2);rn rn Status = WSAStartup(wVersionReqd,&lpmyWSAData); if (Status != 0)rn return FALSE;rn rn return TRUE;rnrnBOOL SetListenSock()rnrn int T;rnrn //Socketrn p_ListenSocket = socket(AF_INET,SOCK_STREAM,0);//rn if (p_ListenSocket==INVALID_SOCKET)rn return FALSE;rnrn p_ListenSocketAddr.sin_family = AF_INET；rn p_ListenSocketAddr.sin_port = htons(PORT);//rn p_ListenSocketAddr.sin_addr.s_addr = INADDR_ANYrn T = bind(p_ListenSocket,(struct sockaddr far *)&p_ListenSocketAddr,sizeof(p_ListenSocketAddr));rn if (T != 0)rn return FALSE;rnrn T = listen(p_ListenSocket,5);rn if (T!=0)rn AfxMessageBox("¼àÌý³ö´í£¡BOOL SetListenSock()");rn return FALSE;rn rnrn return TRUE;rnrnUINT SendFile(LPVOID pParam)rn//rn rnrn SOCKETm_SendSocket;rn struct sockaddr_in SocketAddr;rn rn m_SendSocket = socket(AF_INET,SOCK_STREAM,0);rn if (m_SendSocket < 0)rn return 0;rn rn//以下是设置IP IP是没有错的rn BYTE nField[4];rn dlg->m_IpAddressCtrl.GetAddress(nField[0],nField[1],nField[2],nField[3]);rn SocketAddr.sin_addr.S_un.S_un_b.s_b1=nField[0];rn SocketAddr.sin_addr.S_un.S_un_b.s_b2=nField[1];rn SocketAddr.sin_addr.S_un.S_un_b.s_b3=nField[2];rn SocketAddr.sin_addr.S_un.S_un_b.s_b4=nField[3];rn SocketAddr.sin_family = AF_INET;rn SocketAddr.sin_port = htons(PORT);rnrn //SocketAddr.sin_addr.s_addr = inet_addr(dlg->m_sAddress);rn rn int msgsock = connect(m_SendSocket,(struct sockaddr*)&SocketAddr,sizeof(SocketAddr));rn if (msgsock!=0)rn AfxMessageBox("连接错误",MB_OK);//总在这里是提示rnrn return FALSE;rn rn..............rn

为什么连接不上FTP？: 在我下面的程序中，为什么不能实现这个连接，也没什么错误。调试时每次都进入CATHCH块。我在Internet Explorer中用ftp://ftp.microsoft.com可以进入。rn盼高手回答，谢谢先。rnrn在.H文件中定义这两个变量rnprotected:rn CFtpConnection* m_pFtpConnection;rn CInternetSession* m_pInternetSession;rnrn在.CPP文件中的部分代码如下：rnCFTPConnectView::CFTPConnectView()rnrn // TODO: add construction code herern m_pInternetSession = new CInternetSession;rnrnrnCFTPConnectView::~CFTPConnectView()rnrn if(m_pInternetSession != NULL)rn delete m_pInternetSession;rnrnrnrn/////////////////////////////////////////////////////////////////////////////rn// CFTPConnectView message handlersrnrnint CFTPConnectView::OnCreate(LPCREATESTRUCT lpCreateStruct) rnrn if (CView::OnCreate(lpCreateStruct) == -1)rn return -1;rn rn // TODO: Add your specialized creation code herern SetTimer(1, 1000, NULL);rnrn return 0;rnrnrnvoid CFTPConnectView::OnTimer(UINT nIDEvent) rnrn // TODO: Add your message handler code here and/or call defaultrn KillTimer(nIDEvent);rn rn tryrn rn m_pFtpConnection = m_pInternetSession->GetFtpConnection("ftp.microsoft.com");rn rn catch(CInternetException *pEx)rn rn pEx->Delete();rn m_pFtpConnection = NULL;rn rn rn CView::OnTimer(nIDEvent);rn

中间层为什么连接不上？: 中间层编译过后直接替换了原来的EXE文件，可是客户端连接不上了，后来将Dcom中的ComputerName该为服务器的名字居然可以连接上（在客户处,其实程序中ComputerName是动态赋值的），但现在（在公司）又不行了。why???

为什么SQLServer连接不上: 请问为什么连接SQLServer2000出现以下异常?MSSQL　2000 Service Pack 3a 和SQL Server 2000 Driver for JDBC Service Pack 3都已安装,但还是不行.非常紧急,请高手搞点,多谢啦rnrnjava.sql.SQLException: [Microsoft][SQLServer 2000 Driver for JDBC]Error establishing socket.rn at com.microsoft.jdbc.base.BaseExceptions.createException(Unknown Source)rn at com.microsoft.jdbc.base.BaseExceptions.getException(Unknown Source)rn at com.microsoft.jdbc.base.BaseExceptions.getException(Unknown Source)rn at com.microsoft.jdbc.sqlserver.tds.TDSConnection.(Unknown Source)rn at com.microsoft.jdbc.sqlserver.SQLServerImplConnection.open(Unknown Source)rn at com.microsoft.jdbc.base.BaseConnection.getNewImplConnection(Unknown Source)rn at com.microsoft.jdbc.base.BaseConnection.open(Unknown Source)rn at com.microsoft.jdbc.base.BaseDriver.connect(Unknown Source)rn at java.sql.DriverManager.getConnection(DriverManager.java:582)rn at java.sql.DriverManager.getConnection(DriverManager.java:185)

为什么连接不上远程桌面？: 是windows 2008搭建的服务器。服务器在大学校园内，但是在校园内可以连接上此服务器的远程桌面，可是出了校园就连接不上了，怎么回事？

asp连接mysql连接不上，: [code=VBScript]dim connrnrnif not isObject(conn) then openconnrnsub openconn ()rn rn const uname = "root"rn const pwd = "771025gao"rn const serverip = "localhost"rn const dbase = "xwgg" '用户名跟密码我用那个管理登录上了rn dim connstrrn On Error Resume Nextrn connstr="driver=mysql odbc 3.51 driver;database="&dbase&";server="&serverip&";uid="&uname&";password="&pwd&""rn '无需配置dsnrn rn set conn = server.createobject("adodb.connection")rn conn.open strconnectionrn If Err Thenrn Err.Clearrn Set Conn = Nothingrn Response.Write "数据库连接出错，请检查Conn.asp文件中的数据库参数设置。" & connstrrn Response.Endrn End If rnend sub[/code]rnmysql数据库是5.0.4rnodbc 是从这下的http://dev.mysql.com/downloads/connector/odbc/3.51.html#win32，就是这个Windows ZIP/Setup.EXE (x86)下下来安装的，rn可就是连不上，应该怎样弄呢

JSP 连接Mysql 一直连接不上: 我用的是eclipse-jee-galileo-SR1-win32 tomca6.0 Mysql5.1 下载下来的驱动是mysql-connector-java-5.1.10-bin.jar 我将它放在了D:\目录下并写进了系统变量calsspath 还把它放进了eclipse工作区的项目\WebContent\WEB-INF\lib中 tomcat安装目录下的lib中也放进去了但是程序运行结果一直是：rnrnHTTP Status 404 - rnrn--------------------------------------------------------------------------------rnrntype Status reportrnrnmessage rnrndescription The requested resource () is not available.rnrnrn--------------------------------------------------------------------------------rnrnApache Tomcat/6.0.20rnrn程序如下：rnrnrnrnrnrnrnrnrn rn 创建数据库rnrnrnrnrnrn

连接不上mysql，找不到mysql解决办法: 长时间不用mysql 发现不能正常启动msyq，服务项也找到不到了。 问题原因： cclear Dism++ 等清理软件清理了。报错： ERROR 2003 (HY000): Can't connect to MySQL server on 'localhost' (10061) 解决办法 1.管理员运行cmd，cd到mysql根目录 2、cmd管理员执行

Apache mysql php配置连接不上mysql: Apache mysql php配置连接不上mysql怎么回事，不管我怎么改都连不上，我是菜鸟，请求帮助rnrn我装的是mysql5.3.17rnapache2.2.11rnphp5.3.0rnapache可以运行PHP测试也正常，就是连接数据库出了问题rnrn附部分配置信息rnPHP配置5.3的和以前的不一样了吗？？？rnrn[dba]rn;dba.default_handler=rnrn; Local Variables:rn; tab-width: 4rn; End:rn[PHP_BZ2]rnextension=php_bz2.dllrn[PHP_CURL]rnextension=php_curl.dllrn[PHP_GD2]rnextension=php_gd2.dllrn[PHP_GETTEXT]rnextension=php_gettext.dllrn[PHP_IMAP]rnextension=php_imap.dllrn[PHP_MBSTRING]rnextension=php_mbstring.dllrn[PHP_MYSQL]rnextension=php_mysql.dllrn[PHP_MYSQLI]rnextension=php_mysqli.dllrn[PHP_OPENSSL]rnextension=php_openssl.dllrn[PHP_PDO_MYSQL]rnextension=php_pdo_mysql.dllrn[PHP_PDO_ODBC]rnextension=php_pdo_odbc.dllrn[PHP_PDO_SQLITE]rnextension=php_pdo_sqlite.dllrn[PHP_PGSQL]rnextension=php_pgsql.dllrn[PHP_SOAP]rnextension=php_soap.dllrn[PHP_SOCKETS]rnextension=php_sockets.dllrn[PHP_SQLITE3]rnextension=php_sqlite3.dllrn[PHP_TIDY]rnextension=php_tidy.dllrn[PHP_XMLRPC]rnextension=php_xmlrpc.dllrn[PHP_EXIF]rnextension=php_exif.dllrnrnAPACHE的配置信息rn#BEGIN PHP INSTALLER EDITS - REMOVE ONLY ON UNINSTALLrnPHPIniDir "C:/PHP/"rnLoadModule php5_module "C:/PHP/php5apache2_2.dll"rn#END PHP INSTALLER EDITS - REMOVE ONLY ON UNINSTALLrnPHP5.3安装程序自己干添加上去的

Navicat连接不上Linux服务器上的MySQL。: 1.首选你Linux服务器上要装配好了MySQL数据库。 2.在Linux服务区上登入到MySQL数据库的命令行。 3.输入use mysql 切换到MySQL数据库. 4.输入： grant all privileges on *.* to root@"%" identified by "密码"; 这相当于是给IP-xxx.xxx.xxx.xxx赋予了所

为什么连接SQL SERVER2000连接不上: 我将环境变量等设置情况写在下面：rnweb server:apache_1_3_12_win32.exe,安装在c:\apache；rnservlet容器：ApacheJServ-1.1.2-2.exe，安装在c:\Apache JServ 1.1.2;rnj2sdk:j2sdk-1_3_1_07-windows-i586.exe,安装在c:\jdk1.3.1_07;rntomcat:jakarta-tomcat-3.2.3.zip,安装在c:\jtomcatrnjdbc:Microsoft SQL Server 2000 Driver for JDBC,安装在d:\program file\Microsoft SQL Server 2000 Driver for JDBC下rnclasspath设置：c:\jdk1.3.1_07\lib\tools.jar;c:\jdk1.3.1_07\lib\dt.jar;c:\jdk1.3.1_07\user;c:\jtomcat\lib\servlet.jar;c:\jdk1.3.1_07\lib\msbase.jar;c:\jdk1.3.1_07\lib\mssqlserver.jar;c:\jdk1.3.1_07\lib\msutil.jarrn其中将JDBC FOR SQL SERVER三个文件拷贝到c:\jdk1.3.1_07\lib下；rnpath设置：rnc:\jdk1.3.1_07\binrntomcat的PORTS设置为8080;rn在c:\下编译servlet文件DBConnect.java,出错信息为：rn凡是有JDBC类的地方均为 can not resolve symbolrn源代码为：rnimport com.microsoft.jdbc.sqlserver.SQLServerDriver;rnimport java.net.*;rnimport java.lang.*;rnimport java.io.*;rnimport java.sql.*;rnimport javax.servlet.*;rnrnpublic class DBConnect extends GenericServletrn private Connection dcon=null;rn public void init(ServletConfig con) throws ServletExceptionrn super.init(con);rn String driver="com.microsoft.jdbc.sqlserver.SQLServerDriver";rn String url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=pubs;User=sa;password="; rn tryrn Class.forName(driver).newInstance;rn dcon=DriverManager.getConnetion(url);rn rn cathch(Exception ex)rn system.out.println(ex.toString());rn rn rn public void service(ServletRequest req,ServletResponse res) throws ServletException.IOExceptionrn String sqlstr="select * from jobs";rn Statement lstmt=dcon.CreateStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);rn ResultSet rs=lstmt=con.executeQuery(sqlstr);rn res.setContentType("text/html");rn PrintWriter out = response.getWriter()rn out.println("");rn out.println("");rn out.println("");rn out.println(" Hello World!");rn out.println("");rn out.println("");rn lsmt.last();rn rn int num=lsmt.getRow(); rn rn if (num==0)rn out.println(" 数据库中无记录!");rn rn elsern lsmt.first();rn while (lsmt.next())rn out.println(""+lstmt.getString("job_id")+"");rn out.println(""+lstmt.getString("job_desc")+"");rn rn rn rn out.println("");rn out.println(""); rn lstmt.close();rn rn public void destroyrn dcon.close()rn rnrnrn

ADO连接ACCESS数据库为什么连接不上: 会出现什么原因？

静态库链接不上，是怎么回事呢？: 在Linux下编译一个NCL 的C程序需要链接libnetcdf.a的一个静态库，它放在/usr/local/lib下，rn编译时使用命令nhlcc -o test test.c -l/usr/local/lib/libnetcdf.a （NCL 自带命令）rnrn即gcc -DSYSV -D_POSIX_SOURCE -D_XOPEN_SOURCE -DByteSwapped -D__UNIXOS2__ -DNeedFuncProto -ansi -fPIC -O0 -o cn14c cn14c.c -l/usr/local/lib/libnetcdf.a -L/usr/local/lib -I/usr/local/include -lhlu -lncarg -lncarg_gks -lncarg_c -lX11 -lXext -lgfortran -lmrnrn但是报错rn/usr/bin/ld: cannot find -l/usr/local/lib/libnetcdf.arn我查看了/ect/ld.so.conf.d/lic.conf文件中默认路径为/usr/local/lib 没有错啊，请问为什么还链不进去呢？rn求高手指点！rnrn

NAVICAT 链接不上远程服务器里的MYSQL～～！！: 首先声明，配置MYSQL权限那个已经试过了，没用的，还有其他原因没。rnrnrn2003 - Cann't connet to Mysql server on 'XXX.XXX.XXX.XXX' (10060)rnrn这个错误

链接不上 FlatSB_SetScrollPos 的问题: mingw32-makern==== Building test ====rnapp.cpprnmain.cpprnLinking testrnobj/Debug/main.o: In function `ZN7DlgMain8InitListEP6HWND__':rnd:/develop/C-C++/listview/main.cpp:171: undefined reference to `FlatSB_SetScrollPos@16'rncollect2: ld returned 1 exit statusrnmingw32-make[1]: *** [debug/exeName.exe] Error 1rnmingw32-make: *** [test] Error 2rnrn我用的是 MinGW5.1.4rn求解，谢谢

为什么总是链接不上SQLSERVER: [code=PHP]rn rn[/code]rnrn始终出现如下错误rn[code=PHP]rnFatal error: Call to undefined function mssql_connect() in E:\wwwroot\phptest\PHP\index.php on line 3 rn[/code] rnrn我的PHP是php-5.3.2-nts-Win32-VC9-x86.msirnsql驱动是php_sqlsrv_53_nts_vc9.dllrnrnphp.ini也做了相应配置rn; Windows Extensionsrn; Note that ODBC support is built in, so no dll is needed for it.rn; Note that many DLL files are located in the extensions/ (PHP 4) ext/ (PHP 5)rn; extension folders as well as the separate PECL DLL download (PHP 5).rn; Be sure to appropriately set the extension_dir directive.rn extension=php_sqlsrv_53_nts_vc9.dllrnrn请教rnrn

为什么我的链接不上图片？: 我在WEB窗体里面放入一个IMG服务器控件，为什么图片显示不出来？rn我.NET的程序目录是设置在F:\目录下，IIS里面的主目录我也设置在同一个目录下，然后我直接把图片文件夹images拷贝到了F:\目录下，在我用IMG的IMGURL属性时，我选的相对路径，我看见了一本书上说，可以直接用“～”取代掉：“http://localhost/aspnet/”路径，可是当我用“～/images/xxx.gif”时却显示不出图片是为什么啊？

如何解决mysql连接远程服务器连接不上的问题: 前言今天在给测试服务器安装完mysql服务器之后，想着使用我本地的navicat连接一下，但是直接报了Host 'xxx'is not allowed to connect to this MySQL server这个错误，一开始我以为是测试服务器防火墙或者是端口没有对外开放引起的，但是发现测试环境防火墙没开以及端口也是开放的，后来网上找了一下，原来是mysql服务器没有开启远程访问权限导致...

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安装mysql后使用mysql workbench连接不上的问题: 在cmd中可以连接mysql，但是mysql workbench连接不上。查了后是，mysql 加密方式改变。在cmd黑窗口中启动MySql服务器后输入：ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'your password';FLUSH PRIVILEGES;...

hibernate + mysql 长时间不用后就连接不上的问题。: 大家遇到过这个问题吗？如何解决的？

SOCKET编程，为什么连接不上呢，帮我看看呀: 编译可以通过，运行后，连接服务器的时候应该弹出窗口，可是却没有。是不是没有连接上呢。rnrnclient端主要代码：rnvoid CChatClientDlg::OnConnect() rnrn // TODO: Add your control notification handler code herern WSADATA wsaData;rn WSAStartup(MAKEWORD(2,1),&wsaData);rn ServerSocket=socket(AF_INET,SOCK_STREAM,0);rn sockStruct.sin_family=AF_INET;rn sockStruct.sin_port = htons(8001);rn sockStruct.sin_addr.S_un.S_addr = inet_addr("192.168.0.26");rn connect(ServerSocket,(LPSOCKADDR)&sockStruct,sizeof(sockStruct));rn WSAAsyncSelect(ServerSocket,m_hWnd,WM_SERVER,FD_READ|FD_CLOSE);rn flag = true;rn return;rnrnrnvoid CChatClientDlg::OnDisconnect() rnrn // TODO: Add your control notification handler code herern WSACleanup();rn flag = false;rnrnrnvoid CChatClientDlg::OnCancel() rnrn // TODO: Add extra cleanup herern if ( flag )rn rn MessageBox("ÇëÏÈ¶Ï¿ªÁ¬½Ó","ÌáÊ¾");rn return;rn rn CDialog::OnCancel();rnrnrnvoid CChatClientDlg::OnOK() rnrn // TODO: Add extra validation herern rn //CDialog::OnOK();rnrnrnLRESULT CChatClientDlg::OnServer(WPARAM wParam,LPARAM lParam)rnrn switch (WSAGETSELECTEVENT(lParam))rn rn case FD_READ:rn //recv(ServerSocket,(char *)&msg,sizeof(msg),0);rn MessageBox("gfsdg");rn // m_log.Format("%s\r\n%s",(char *)msg.msg,m_log);rn // UpdateData( false );rn break;rn case FD_CLOSE:rn closesocket(ServerSocket);rn flag = false;rn break;rn rn return 0L;rnrnserver端代码：rnvoid CChatServerDlg::OnOK() rnrn // TODO: Add extra validation herern UpdateData();rn strcpy((char *)msg.msg,(LPCTSTR)m_msg);rn msg.i = 0;rn send(ClientSocket,(char *)&msg,sizeof(msg),0);rn //CDialog::OnOK();rnrnrnvoid CChatServerDlg::OnCancel() rnrn // TODO: Add extra cleanup herern if ( flag )rn rn MessageBox("ÇëÏÈÍ£Ö¹·þÎñÆ÷","ÌáÊ¾");rn return;rn rn CDialog::OnCancel();rnrnrnvoid CChatServerDlg::OnStop() rnrn // TODO: Add your control notification handler code herern m_log = "·þÎñÆ÷Í£Ö¹\r\n" + m_log;rn UpdateData( false );rn flag = false;rn WSACleanup();rnrnrnvoid CChatServerDlg::OnStart() rnrn // TODO: Add your control notification handler code herern WSADATA wsaData;rn WSAStartup(MAKEWORD(2,1),&wsaData);rn ServerSocket = socket(AF_INET,SOCK_STREAM,0);rnrn m_ServerAddr.sin_family = AF_INET;rn m_ServerAddr.sin_addr.s_addr = INADDR_ANY;rn m_ServerAddr.sin_port = htons(8001);rn bind(ServerSocket,(LPSOCKADDR)&m_ServerAddr,sizeof(m_ServerAddr));rn WSAAsyncSelect(ServerSocket,m_hWnd,WM_CLIENT,FD_ACCEPT|FD_READ|FD_CLOSE);rn listen(ServerSocket,1);rn flag = true;rn m_log = "·þÎñÆ÷Æô¶¯³É¹¦\r\n" + m_log;rn UpdateData( false );rnrnrnLRESULT CChatServerDlg::OnClient(WPARAM wParam,LPARAM lParam)rnrn switch (WSAGETSELECTEVENT(lParam))rn rn case FD_READ:rn break;rn case FD_CLOSE:rn break;rn case FD_ACCEPT:rn MessageBox("FD_ACCEPT");rn break;rn rn return 0L;rnrn

为什么我的JSP连接不上Oracle数据库呢???: 我用一个JAVABEAN连接Oracle数据库，但问题是在安装了oracle 的电脑上能连接，但在没有安装oracle 的电脑上运行，却连接不了另一台机上的oracle 数据库。是不是我那台机上没有oracle的数据驱动呢？请各位多多指教！

为什么我的第二个socket连接不上呢？: 第一个socket可以接收到"socket 1 accept ok"rn第二个就接收不到rnrn[code=C/C++] // Set Port = IMGPORT, leaving IP address = Anyrn memset(&sin1, 0, sizeof(sin1));rn sin1.sin_addr.s_addr = INADDR_ANY;rn sin1.sin_family = AF_INET;rn sin1.sin_port = htons(DATAPORT1);rn rn memset(&sin2, 0, sizeof(sin2));rn sin2.sin_addr.s_addr = INADDR_ANY;rn sin2.sin_family = AF_INET;rn sin2.sin_port = htons(DATAPORT2);[/code]rnrn[code=C/C++] size1 = sizeof( sin1 );rn size2 = sizeof( sin2 ); rn rn stcpactive1 = accept( stcp1, (struct sockaddr*)&sin1, (int*)&size1 );rn if( stcpactive1 == INVALID_SOCKET)rn rn AfxMessageBox("socket 1 accept failed");rn goto leave;rn rn elsern rn AfxMessageBox("socket 1 accept ok");rn goto leave;rn rn stcpactive2 = accept( stcp2, (struct sockaddr*)&sin2, (int*)&size2 );rn if( stcpactive2 == INVALID_SOCKET)rn rn AfxMessageBox("socket 2 accept failed");rn goto leave;rn rn elsern rn AfxMessageBox("socket 2 accept ok");rn goto leave;rn [/code]

MPEG Layer-3(压缩)为什么连接不上呢??: audio capture=>ACM wraper=>MPEG Layer-3=>AVI mux=>file writerrn我在graph edit中都能连接正常，但是在程序中MPEG Layer-3连接就连不上。rn哪位知道原因??

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iPhone3,1_SHSH6.1下载: iPhone3,1_SHSH6.1 刷机必备文件相关下载链接：[url=//download.csdn.net/download/qq_17028505/7566725?utm_source=bbsseo]//download.csdn.net/download/qq_17028505/7566725?utm_source=bbsseo[/url]

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