UbuntuMySQL远程登录_MySQL

引言

只道成功方法，不述失败经历。折腾了3天的MySQL远程登录，终于告一段落了。。

MySQL远程登录

远程登录命令

mysql -h ip(or ipv6) -u username －p userpassword

如果把-h ip省略，MySQL将默认本地登录，即

mysql -u username -p userpassword

等价于

mysql -h localhost -u username -p userpassword

初次远程登录登录情形如下：

出现错误，无法连接远程的MySQL数据库！

查看一下用户是否允许远程登录MySQL

（其中%、127.0.0.1和localhost表明对应用户可以本地登录MySQL，linux是一个自定义的host，解析的ip为127.0.0.1，::1是一个ipv6的地址，指向本机）

由图可知jinqiang用户可以远程登录MySQL，那为什么依然不能远程登录呢？

问题出在MySQL的配置文件上

~cat /etc/mysql/my.cnf | grep "^[^#]" -n19:[client]20:port	= 330621:socket	= /var/run/mysqld/mysqld.sock27:[mysqld_safe]28:socket	= /var/run/mysqld/mysqld.sock29:nice	= 031:[mysqld]35:user	= mysql36:pid-file	= /var/run/mysqld/mysqld.pid37:socket	= /var/run/mysqld/mysqld.sock38:port	= 330639:basedir	= /usr40:datadir	= /var/lib/mysql41:tmpdir	= /tmp42:lc-messages-dir	= /usr/share/mysql43:skip-external-locking47:bind-address	= 127.0.0.151:key_buffer	= 16M52:max_allowed_packet	= 16M53:thread_stack	= 192K54:thread_cache_size = 857:myisam-recover = BACKUP:query_cache_limit	= 1M65:query_cache_size= 16M77:log_error = /var/log/mysql/error.log:expire_logs_days	= 1090:max_binlog_size = 100M112:[mysqldump]113:quick114:quote-names115:max_allowed_packet	= 16M117:[mysql]120:[isamchk]121:key_buffer	= 16M127:!includedir /etc/mysql/conf.d/~

打开/etc/mysql/my.cnf

sudo vi /etc/mysql/my.cnf

将上图
47:bind-address = 127.0.0.1
注释掉
#bind-address = 127.0.0.1
或者改成
bind-address = 192.168.81.93
然后重启MySQL

sudo service mysql restart

再次尝试远程登录

登录成功。

C#远程连接MySQL

关键代码（环境为windows）

private void buttonTest_Click(object sender, EventArgs e)	{	string constr = "host=192.168.81.93;user=jinqiang;password=123456;database=test;";	MySqlConnection mycon = new MySqlConnection(constr);	mycon.Open();	MySqlCommand mycmd = new MySqlCommand("insert into employee(id,name,password,email) values(1,'jinqiang','1234567','hellojinqiang@gmail.com')", mycon);	if (mycmd.ExecuteNonQuery() > 0)	{	labelTest.Text = "数据插入成功！";	}	else	{	labelTest.Text = "数据插入失败！";	}	mycon.Close(); 	}

PS：
C#连接MySql测试代码下载：http://yunpan.cn/QN7dHwqYPV8i4 （提取码：b3a1）
除此之外，你需要安装MySQL Connector Net：

http://dev.mysql.com/downloads/connector/net/

查看结果

（完）