Question

  try {
        String connectionURL = "jdbc:mysql://sql4.000webhost.com/a7291194_xxx";
        Connection connection = null; 
        Class.forName("com.mysql.jdbc.Driver").newInstance(); 
        connection = DriverManager.getConnection(connectionURL, "a7291194_xxx", "xxx");
        if(!connection.isClosed())
             System.out.println("Successfully connected to " + "MySQL server using TCP/IP...");
        connection.close();
    }catch(Exception ex){
        System.out.println("Unable to connect to database"+ex);
    }

使用以下连接器代码我尝试连接000webhost.com上的数据库，但它给了我一个错误：

    CommunicationsException: Communications link failure

    The last packet sent successfully to the server was 0 milliseconds ago. 
    The driver has not received any packets from the server.

我是第一次尝试，因为我对网站主办完全不熟悉所以请提前帮助我！

Answer 1

在您的本地或服务器

上相同

Class.forName("com.mysql.jdbc.Driver");  
Connection connection = DriverManager.getConnection("jdbc:mysql://DomainName OR IP:3306/databasename", "username", "password");

Answer 2

在000webhost.com上，出于安全性和服务器性能原因，远程MySQL连接被禁用。如果您升级帐户，将启用MySQL连接。

无法连接我的数据库000webhost.com

2 个答案: