com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

最新推荐文章于 2024-07-02 20:42:01 发布

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最新推荐文章于 2024-07-02 20:42:01 发布

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文章标签：数据库

本文介绍了在使用NetBeans 6.5进行Java编程时遇到的MySQL数据库连接失败问题及解决方案。错误提示为“com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure”。文章提供了检查MySQL服务是否正常运行的方法，并指导如何启动服务。

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http://netbeans-org.1045718.n5.nabble.com/com-mysql-jdbc-exceptions-jdbc4-CommunicationsException-Communications-link-failure-td2950072.html

It sounds like MySQL server isn't running.

If you are using Windows, make sure mysqld -nt.exe is running. You can use Task Manager to see if the service is running and Control Panel's Administrative Tools|Services dialog to start the service if it is not. On my computer the service name is MySQL .

janpihlgren wrote:

Just installed NetBeans 6.5 and now try to run som javaprogram that require connection to a MySQL -database.
I get this errormessage:
com .mysql .jdbc .exceptions .jdbc4 .CommunicationsException : Communications link failure
and a point to these rows int the program:
String _url = "jdbc :mysql ://localhost:3306/" +database;
Connection conn = DriverManager.getConnection(_url, user, pwd);