How to test connection to Oracle Database using Java

Question

Is there a way to test my connection to oracle database using Java? Here\'s my code.

public class OracleConnection {

    public static void main(String[] args)          


        

Answer 1

You can catch SQLException from DriverManager.getConnection() and looks for ORA-12543.
Read SQLException documentation about vendor code.

Answer 2

"... and if its not then the program will connect to the next ..." I wonder if a cluster connection string containing multiple server addresses could work for you. (I did not try this myself.) Look at Oracle Connection String for RAC Environment.

Answer 3

Don't reinvent the wheel. Oracle's JDBC driver already has this functionality built-in.

This is useful: http://www.orafaq.com/wiki/JDBC

import java.util.ArrayList;
import java.sql.*;

public class OracleConnection {

    public static void main(String[] args) throws Exception {
        //connect to database
        Class.forName("oracle.jdbc.driver.OracleDriver");
        ArrayList<String> serverNames = new ArrayList<String>();
        serverNames.add("yourhostname1");
        serverNames.add("yourhostname2");
        serverNames.add("yourhostname3");
        serverNames.add("yourhostname4");
        String portNumber = "1521";
        String sid = "ORCLSID";
        String url = "jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS_LIST=(LOAD_BALANCE=ON)(FAILOVER=ON)" ;
        for (String serverName : serverNames) {  
            url += "(ADDRESS=(PROTOCOL=tcp)(HOST="+serverName+")(PORT="+portNumber+"))";
        }
        url += ")(CONNECT_DATA=(SID="+sid+")))";
        String username = "USERNAME";
        String password = "PASSWORD";
        // System.out.println(url); // for debugging, if you want to see the url that was built
        Connection conn = DriverManager.getConnection(url, username, password);
    }
}

The above code actually builds and uses url that looked like this (as example belows). I got this explicitly by uncommenting the debugging line near the end of the code:

jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS_LIST=
    (LOAD_BALANCE=ON)(FAILOVER=ON)
    (ADDRESS=(PROTOCOL=tcp)(HOST=yourhostname1)(PORT=1521))
    (ADDRESS=(PROTOCOL=tcp)(HOST=yourhostname2)(PORT=1521))
    (ADDRESS=(PROTOCOL=tcp)(HOST=yourhostname3)(PORT=1521))
    (ADDRESS=(PROTOCOL=tcp)(HOST=yourhostname4)(PORT=1521))
  )(CONNECT_DATA=(SID=ORCLSID)))

Answer 4

Class.forName("oracle.jdbc.driver.OracleDriver");
conn = DriverManager.getConnection(“url”,”username”,”password ″); 

look more at here:http://leezk.com/tag/jdbc