如何在java.sql.Connection中检索主机、端口、sid、用户和密码信息

Question

I have an Oracle connection (in a java.sql.Connection object) that is mounted from a properties file (ApplicationResources.properties).

How do I capture information about host, port, sid, user and password? (I need this information to call a specific database function through my java application)

Below my code:

private void conectaBanco() {
    ServiceLocator sl = new ServiceLocator();
    InitialContext ic = null;
    DataSource dataSource = null;
    try {
        if (conn == null) {
            ic = new InitialContext();
            dataSource = (DataSource) ic.lookup(sl.getInfo().getString("JNDI"));                
            conn = dataSource.getConnection();
            conn.setAutoCommit( true );
                            
            // I need host, port, sid and password information
            System.out.println("USER " + conn.getMetaData().getUserName());                                                
        }
    } catch (SQLException e) {
        logger.error("Erro ao tentar abrir conexao com o banco de dados.", e);
    } catch (NamingException e) {
        logger.error("Erro ao tentar abrir conexao com o banco de dados.", e);
    }
    
    if(conn != null)
        rastrear.definePredicate(conn);
}

Answer 1

SESSION SID:

SELECT sys_context('USERENV', 'SID') FROM DUAL;

ORACLE_SID:

SELECT sys_context('userenv','instance_name') FROM dual;

HOST (Database machine) :

SELECT UTL_INADDR.get_host_name FROM dual;

Password: See http://www.dba-oracle.com/t_password_storage.htm

CLIENT SIDE Port:

Select port from v$session;

SERVER OS PID of Oracle server process connected to client process

SELECT p.spid
FROM   v$process p, v$session s
WHERE s.paddr = p.addr and 
sys_context('USERENV', 'SID') = s.sid;

Server side port:

This is really difficult since the server process port is mapped to a different port then the initial - for example port 12102 in listener.ora/tnsnames.ora get mapped by listener to a arbitrary free one (by the way: thats the reason why often firewalls need to be shutdown and while connections cannot get after mapping through firewall. This can be fixed but this is another story)

Below code

• grants required privileges

• defines a java stored function "Util.RunThis" which executes on database server a OS command passed into function and return string.

• "Util.RunThis" is mapped to PL/SQL function "RUN_CMD"

• "GET_PORT" is a PL/SQL function returning a numeric value of the used Port of the database server process connected to client session. Inside GET_PORT the SELECT is used to determine database server process pid replacing [SPID] in command below

   /usr/sbin/lsof -Pan -p [SPID] -i

• finally invoking a simple select we get the Port of database server process attached to current session

   connect / as sysdba grant select on sys.v_$process to scott; grant select on sys.v_$session to scott; begin dbms_java.grant_permission ('SCOTT', 'SYS:java.io.FilePermission', '<<ALL FILES>>', 'execute'); end; / connect scott/tiger@foo.com create or replace and compile java source named "Util" as import java.io.*; import java.lang.*; import java.nio.charset.Charset; import java.nio.*; public class Util extends Object { public static String RunThis(String args) { Runtime rt = Runtime.getRuntime(); String rc = args; try { Process p = rt.exec(args); int bufSize = 4096; BufferedInputStream bis = new BufferedInputStream(p.getInputStream(), bufSize); int len; byte buffer[] = new byte[bufSize]; // Echo back what the program spit out while ((len = bis.read(buffer, 0, bufSize)) != -1) { String xxx = new String(buffer, Charset.forName("UTF-8")); rc = rc + xxx; } p.waitFor(); rc = rc + "ABC"; } catch (Exception e) { e.printStackTrace(); rc = "Exception!!!" ; } finally { return rc; } } } / create or replace function RUN_CMD( p_cmd in varchar2) return VARCHAR2 as language java name 'Util.RunThis(java.lang.String) return java.lang.String'; / create or replace function GET_PORT return number as SPID NUMBER; retval varchar2(32000); y varchar2(1024); cmd VARCHAR2(256); begin SELECT p.spid INTO SPID FROM sys.v_$process p, sys.v_$session s WHERE s.paddr = p.addr and sys_context('USERENV', 'SID') = s.sid; cmd := '/usr/sbin/lsof -Pan -p [SPID] -i'; /* raw string data returned from Shell executing cmd */ retval := run_cmd(replace(cmd,'[SPID]', SPID)); /* get last occurance of : marking redirected port */ y := substr(retval,INSTR(retval,':', -1)+1,1024); /* return the numeric port by stripping info like " (ESTABLISHED)" */ return to_number(substr(y,1,INSTR(y, ' ')-1)); end; / show errors select get_port from dual; /*-------------------- OUTPUT -------------------------- */ SQL> connect / as sysdba grant select on sys.v_$process to scott; grant select on sys.v_$session to scott; begin dbms_java.grant_permission ('SCOTT', 'SYS:java.io.FilePermission', '<<ALL FILES>>', 'execute'); end; /Connected. SQL> SQL> Grant succeeded. SQL> SQL> Grant succeeded. SQL> SQL> 2 3 4 5 6 7 8 PL/SQL procedure successfully completed. SQL> connect scott/tiger@foo.com Connected. SQL> create or replace and compile java source named "Util" 2 as import java.io.*; import java.lang.*; import java.nio.charset.Charset; 3 4 5 6 import java.nio.*; 7 public class Util extends Object 8 { 9 public static String RunThis(String args) { Runtime rt = Runtime.getRuntime(); 10 11 12 String rc = args; 13 14 try 15 { 16 17 Process p = rt.exec(args); 18 19 int bufSize = 4096; 20 BufferedInputStream bis = 21 new BufferedInputStream(p.getInputStream(), bufSize); 22 int len; byte buffer[] = new byte[bufSize]; 23 24 // Echo back what the program spit out while ((len = bis.read(buffer, 0, bufSize)) != -1) 25 26 27 { 28 String xxx = new String(buffer, Charset.forName("UTF-8")); 29 rc = rc + xxx; 30 } p.waitFor(); 31 32 rc = rc + "ABC"; 33 34 35 } 36 catch (Exception e) 37 { 38 e.printStackTrace(); 39 rc = "Exception!!!" ; 40 } 41 42 finally 43 { 44 return rc; 45 } } 46 47 } / 48 Java created. SQL> create or replace function RUN_CMD( p_cmd in varchar2) return VARCHAR2 as language java name 'Util.RunThis(java.lang.String) return java.lang.String'; / 2 3 4 Function created. SQL> create or replace function GET_PORT return number as SPID NUMBER; retval varchar2(32000); 2 3 4 5 y varchar2(1024); cmd VARCHAR2(256); begin 6 7 8 SELECT p.spid INTO 9 10 11 SPID FROM sys.v_$process p, sys.v_$session s WHERE 12 13 14 15 16 s.paddr = p.addr and sys_context('USERENV', 'SID') = s.sid; cmd := '/usr/sbin/lsof -Pan -p [SPID] -i'; 17 18 19 20 21 /* raw string data returned from Shell executing cmd */ retval := run_cmd(replace(cmd,'[SPID]', SPID)); 22 23 24 /* get last occurance of : marking redirected port */ y := substr(retval,INSTR(retval,':', -1)+1,1024); /* return the numeric port by stripping info like " (ESTABLISHED)" */ 25 26 27 28 return to_number(substr(y,1,INSTR(y, ' ')-1)); end; / show errors 29 30 Function created. SQL> No errors. SQL> select get_port from dual; GET_PORT ---------- 36586

Answer 2

I solve this problem adding on my Weblogic configuration JDBC the additional parameters (host, user, port, sid - the password is returned automaticaly). And I got this values throw this code below:

import weblogic.jdbc.wrapper.PoolConnection;
import java.util.Properties;
(...)
public Properties retornaPropriedadesConexao(){
    PoolConnection pc = (PoolConnection)conn;
    Properties p = pc.getConnectionEnv().getDriverProperties();                            
    return p;
}