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Help Center> Relational Database Service> User Guide> Working with RDS for MySQL> Instance Connection> Connecting to an RDS for MySQL Instance Through JDBC
Updated at: Apr 02, 2022 GMT+08:00

Connecting to an RDS for MySQL Instance Through JDBC

If you are connecting to an instance through JDBC, the SSL certificate is optional. For security reasons, you are advised to download the SSL certificate to encrypt the connection. SSL is disabled by default for MySQL DB instances. You can enable SSL by referring to Configuring an SSL Connection. SSL encrypts connections to databases but it increases the connection response time and CPU usage, so enabling it is not recommended.

Prerequisites

Familiarize yourself with:

  • Computer basics.
  • Java programming language.
  • JDBC knowledge.

Connection with the SSL Certificate

Download the SSL certificate and verify the certificate before connecting to databases.

On the Instance Management page, click the instance name. Check whether SSL is enabled in the DB Information area. If no, click . In the displayed dialog box, click Yes to enable SSL. Then, click next to SSL to download the root certificate or certificate bundle.

  1. Connect to the RDS for MySQL DB instance through JDBC.

    jdbc:mysql://<instance_ip>:<instance_port>/<database_name>?sslmode=verify-full&sslrootcert=<ca.pem>
    Table 1 Parameter description

    Parameter

    Description

    <instance_ip>

    If you attempt to access the RDS DB instance through an ECS, set instance_ip to the floating IP address displayed on the Basic Information page of the DB instance to which you intend to connect.

    If you access the RDS DB instance through an EIP, set instance_ip to the EIP that has been bound to the DB instance.

    <instance_port>

    Enter the database port displayed on the Basic Information page. The default port is 3306.

    <database_name>

    Enter the name of the database to which you intend to connect. The default database name is mysql.

    sslmode

    Enter the SSL connection mode. The default mode is verify-full.

    sslrootcert

    Enter the directory of the CA certificate for the SSL connection. The certificate should be stored in the directory where the command is executed.

    Example script in Java:

    import java.sql.Connection; 
    import java.sql.DriverManager; 
    import java.sql.ResultSet; 
    import java.sql.Statement;
    import java.sql.SQLException; 
     
    public class MyConnTest { 
        final public static void main(String[] args) { 
            Connection conn = null; 
             Statement stat = null;
            // set sslmode here. 
            // with ssl certificate and path. 
            String url = "jdbc:mysql://192.168.0.225:3306/my_db_test?sslmode=verify-full&sslrootcert=/home/Ruby/ca.pem"; 
     
            try { 
                Class.forName("com.mysql.jdbc.Driver"); 
                conn = DriverManager.getConnection(url, "root", "password"); 
                System.out.println("Database connected"); 
     
                Statement stmt = conn.createStatement(); 
                  String sql = "SELECT * FROM mytable WHERE columnfoo = 500";
                ResultSet rs = stmt.executeQuery(sql); 
                while (rs.next()) { 
                    System.out.println(rs.getString(1)); 
                } 
     
                rs.close(); 
                stmt.close(); 
                conn.close(); 
            } catch (Exception e) { 
                e.printStackTrace(); 
                System.out.println("Test failed"); 
            } finally { 
                // release resource .... 
            } 
        } 
    }

Connection Without the SSL Certificate

You do not need to download the SSL certificate because certificate verification on the server is not required.

  1. Connect to the RDS for MySQL DB instance through JDBC.

    jdbc:mysql://<instance_ip>:<instance_port>/<database_name>?sslmode=require
    Table 2 Parameter description

    Parameter

    Description

    <instance_ip>

    If you attempt to access the RDS DB instance through an ECS, set instance_ip to the floating IP address displayed on the Basic Information page of the DB instance to which you intend to connect.

    If you attempt to access the DB instance through an EIP, set instance_ip to the EIP that has been bound to the DB instance.

    <instance_port>

    Database port displayed on the Basic Information page. Default value: 3306

    <database_name>

    Name of the database to which you intend to connect. Default value: mysql

    sslmode

    SSL connection mode. require indicates that data needs to be encrypted.

    Example script in Java:

    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.ResultSet;
    import java.sql.Statement;
    
    public class MyConnTest {
    	final public static void main(String[] args) {
    		Connection conn = null;
    		// set sslmode here.
    		// no ssl certificate, so do not specify path.
    		String url = "jdbc:mysql://192.168.0.225:3306/my_db_test?sslmode=require";
    		try {
    			Class.forName("com.mysql.jdbc.Driver");
    			conn = DriverManager.getConnection(url, "root", "password");
    			System.out.println("Database connected");
    
    			Statement stmt = conn.createStatement();
    			ResultSet rs = stmt.executeQuery("SELECT * FROM mytable WHERE columnfoo = 500");
    			while (rs.next()) {
    				System.out.println(rs.getString(1));
    			}
    			rs.close();
    			stmt.close();
    			conn.close();
    		} catch (Exception e) {
    			e.printStackTrace();
    			System.out.println("Test failed");
    		} finally {
    			// release resource ....
    		}
    	}
    }

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