java.sql.Connectionでホスト、ポート、sid、ユーザー、およびパスワードの情報を取得する方法

セッションSID：

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

ORACLE_SID：

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

ホスト（データベースマシン）：

SELECT UTL_INADDR.get_host_name FROM dual;

パスワード：http://www.dba-oracle.com/t_password_storage.htm>

Select port from v$session;

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

• 必要な特権を付与します

• データベースサーバー上で関数に渡されたOSコマンドを実行して文字列を返すJavaストアド関数"Util.RunThis"を定義します。

• 「Util.RunThis」はPL/SQL関数「RUN_CMD」にマップされます

• 「GET_PORT」は、クライアントセッションに接続されているデータベースサーバープロセスの使用済みポートの数値を返すPL/SQL関数です。 GET_PORT内では、SELECTを使用して、以下のコマンドで[SPID]を置き換えるデータベースサーバープロセスpidを決定します

  。

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

• 最後に単純な選択を呼び出すと、データベースサーバープロセスのポートが現在のセッションにアタッチされます

    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/[email protected]
  
    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/[email protected]
  
    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