如何在线连接多个数据库？

Question

我正在尝试连接到多个数据库，这是我的代码，此代码在本地机器上运行良好，但是当我将其上传到网上时，它无法正常工作，我可以得到任何帮助提前谢谢你。

package dbase.sqlcon;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class ConnectionHelper{
    private String url;
    private String restrnturl;
    private String prptyurl;
    private String user= "root";
    private String pass= "mysql";
    private String userRestaurent= "root";
    private String passRestaurent= "mysql";
    private String userProperty= "root";
    private String passProperty= "mysql";

    private ConnectionHelper() {
        try {
            Class.forName("com.mysql.jdbc.Driver");

            URLDecoder.decode(getClass().getClassLoader().getResource("flex/testdrive").toString(), "UTF-8");



            url = "jdbc:mysql://192.168.10.1:3306/desisquare";
            restrnturl="jdbc:mysql://192.168.10.1:3306/foodndine";
            prptyurl="jdbc:mysql://192.168.10.1:3306/postaproperty";

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static Connection getConnection() throws SQLException {
        if (instance == null) {
            instance = new ConnectionHelper();
        }
        return DriverManager.getConnection(instance.url, instance.user, instance.pass);
    }
    public static Connection getConnectionrestaurent() throws SQLException {
        if (instance == null) {
            instance = new ConnectionHelper();
        }
        return DriverManager.getConnection(instance.restrnturl, instance.userRestaurent, instance.passRestaurent);
    }
    public static Connection getConnectionproperty() throws SQLException {
        if (instance == null) {
            instance = new ConnectionHelper();
        }
        return DriverManager.getConnection(instance.prptyurl, instance.userProperty, instance.passProperty);
    }

}

当我问我的托管服务提供商有什么问题时，他发给我这个对我来说非常新的问题

INFO | jvm 1 | 2014/04/18 06:23:03 | Exception is ;java.sql.SQLException: Access denied for user 'postaproperty'@'localhost' (using password: YES)
INFO | jvm 1 | 2014/04/18 06:23:03 | Exception is ;java.sql.SQLException: Access denied for user 'postaproperty'@'localhost' (using password: YES)
INFO | jvm 1 | 2014/04/18 06:23:03 | Exception is ;java.sql.SQLException: Access denied for user 'foodndine'@'localhost' (using password: YES)

Answer 1

也有可能出错的事情。但是正如您所提到的，一旦您尝试从外部访问您的数据库，就会出现问题，而此类异常消息可能表明您的数据库由于以下原因而无法访问：

-在 my.cnf 中，您应该确认 --skip-networking 已被注释掉：

[mysqld]
user            = mysql
pid-file        = /var/run/mysqld/mysqld.pid
socket          = /var/run/mysqld/mysqld.sock
port            = 3306
basedir         = /usr
datadir         = /var/lib/mysql
tmpdir          = /tmp
language        = /usr/share/mysql/English
bind-address    = 65.55.55.2
# skip-networking

也就是说你的数据库通过 TCP/IP 接受消息

• 验证您的数据库服务器正在侦听 3306 端口
• 验证 192.168.10.1 是否可以从您的部署站点 (telnet 192.168.10.1:3306) 访问，因为可能有防火墙阻止了该端口或 DNS 不知道此 IP 地址。