MySQL实现远程连接

  安装完MySQL之后就没去配置了,然后每次都是使用local连接,今天做测试使用了IP地址,然后就又掉了链子,以前也遇到过,就是不长记性!!!!!

  错误日志:

 1 java.sql.SQLException: null,  message from server: "Host 'hadoop' is not allowed to connect to this MySQL server"
 2     at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1073)
 3     at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:987)
 4     at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:982)
 5     at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1128)
 6     at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2336)
 7     at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2369)
 8     at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2153)
 9     at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:792)
10     at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
11     at sun.reflect.GeneratedConstructorAccessor2.newInstance(Unknown Source)
12     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
13     at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
14     at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
15     at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:381)
16     at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)
17     at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:135)
18     at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:182)
19     at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:171)
20     at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137)
21     at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014)
22     at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32)
23     at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810)
24     at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)
25 java.lang.NullPointerException
26     at com.asinfo.dao.impl.SuperDao.update(SuperDao.java:113)
27     at com.asinfo.dao.impl.FileDaoImpl.insert(FileDaoImpl.java:75)
28     at com.asinfo.service.impl.FoundFileServiceImpl.foundFile(FoundFileServiceImpl.java:104)
29     at com.asinfo.service.impl.FoundFileServiceImpl.foundFile(FoundFileServiceImpl.java:45)
30     at com.asinfo.main.Main.main(Main.java:16)

 

  解决办法:开启MySQL的远程连接。

  首先查询数据库用户:

use mysql;
select * from user;

 

wKioL1P-pfDQcUvaAAD_qrRXUis400.jpg

    可以看到只有本地连接权限。

    

    开启MySQL的远程连接主要有三种方法:

 

一、授权使用固定IP

执行命令:

grant select,update,insert,delete on *.* to root@10.254.0.230 identified by "root";

  

查询结果:

wKioL1P-pvGiUzHSAAEhUgUEFgY678.jpg

    可以看到在user表中已经添加了root用户的IP连接权限。Host字段表示登录的主机,其值可以用IP,也可用主机名。

 

二、授权法

    可以将Host字段的值改为%,表示在任何客户端机器上能以root用户登录到mysql服务器,建议在开发时设为%。将权限改为ALL PRIVILEGES,执行命令:

grant all privileges  on *.* to root@'%' identified by "root";

  

wKioL1P-qMyQKWzQAAFftVSPWSs628.jpg

可以看到已经添加了对所有客户机都能访问的root账户。

 

三、直接改表

执行命令:

use mysql;
update user set Host = "%" where User = "root";

 

这样,所以客户机都能远程访问本机MySQL了。

 

posted @ 2014-09-26 12:29  沉默的猿  阅读(380)  评论(0编辑  收藏  举报
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