将Java连接到Amazon服务器中的MYSQL数据库

Question

I am trying to connect my java code with mysql DB in amazon rds , i am using this code:

        try {
        Class.forName("com.mysql.jdbc.Driver").newInstance();
        connection = DriverManager.getConnection(
        "jdbc:mysql://HOST:port_number/DB_name","DB_username", "DB_pass");
        st = connection.createStatement();
        rs = st.executeQuery("SELECT * FROM table name WHERE id = 1");
    } catch (Exception e) {
        System.out.println("DB error : " + e);
    }

i am getting this error when i run it :

DB error : java.sql.SQLException: Unable to connect to any hosts due to exception: java.net.SocketException: java.net.SocketException: Permission denied: connect

** BEGIN NESTED EXCEPTION ** 

java.net.SocketException
MESSAGE: java.net.SocketException: Permission denied: connect

STACKTRACE:

java.net.SocketException: java.net.SocketException: Permission denied: connect
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:143)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:225)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:1805)
at com.mysql.jdbc.Connection.<init>(Connection.java:452)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:411)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at DB.<init>(DB.java:15)
at subgroup.main(subgroup.java:72)


** END NESTED EXCEPTION **

any ideas !!

Answer 1

You need to give access to your machine from where you are trying to read the database.

Also you should grant access to your IP using command prompt.

http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/authorizing-access-to-an-instance.html

Answer 2

i rephrase your command because you set the connection variable as drivermanager but in your statement you use con ? and the string inside the connection replace it with the real value for example

connect = DriverManager.getConnection("jdbc:mysql://localhost:3306", "<your DBUsername>", "<your DB Password>");

dont just copy paste next time, learn how the codes work

try {
        Class.forName("com.mysql.jdbc.Driver");
        connection = DriverManager.getConnection(
        "jdbc:mysql://HOST:port_number/DB_name","DB_username", "DB_pass");
        st = connection.createStatement();
        rs = st.executeQuery("SELECT * FROM table name WHERE id = 1");
    } catch (Exception e) {
        System.out.println("DB error : " + e);
    }

Answer 3

In my case the problem was that I was using a connection from emulator to localhost. If you use emulator to localhost dont use localhost,127.0.0.1 in connection String but use:

10.0.2.2

Hope this helps