这篇文章主要介绍了Oracle中获取会话信息的两个函数分享,本文分别讲解了USERENV和两个函数sys_context,并对可以获取哪些信息作了介绍,需要的朋友可以参考下      

1、 USERENV(OPTION)  
　　返回当前的会话信息.  
　　OPTION='ISDBA'若当前是DBA角色,则为TRUE,否则FALSE.  
　　OPTION='LANGUAGE'返回数据库的字符集.  
　　OPTION='SESSIONID'为当前会话标识符.  
　　OPTION='ENTRYID'返回可审计的会话标识符.  
　　OPTION='LANG'返回会话语言名称的ISO简记.  
　　OPTION='INSTANCE'返回当前的实例.  
    OPTION='terminal'返回当前计算机名  
　　SELECT USERENV('LANGUAGE') FROM DUAL;
2、sys_context

复制代码代码如下:
select   
SYS_CONTEXT('USERENV','TERMINAL') terminal,   
SYS_CONTEXT('USERENV','LANGUAGE') language,   
SYS_CONTEXT('USERENV','SESSIONID') sessionid,   
SYS_CONTEXT('USERENV','INSTANCE') instance,   
SYS_CONTEXT('USERENV','ENTRYID') entryid,   
SYS_CONTEXT('USERENV','ISDBA') isdba,   
SYS_CONTEXT('USERENV','NLS_TERRITORY') nls_territory,   
SYS_CONTEXT('USERENV','NLS_CURRENCY') nls_currency,   
SYS_CONTEXT('USERENV','NLS_CALENDAR') nls_calendar,   
SYS_CONTEXT('USERENV','NLS_DATE_FORMAT') nls_date_format,   
SYS_CONTEXT('USERENV','NLS_DATE_LANGUAGE') nls_date_language,   
SYS_CONTEXT('USERENV','NLS_SORT') nls_sort,   
SYS_CONTEXT('USERENV','CURRENT_USER') current_user,   
SYS_CONTEXT('USERENV','CURRENT_USERID') current_userid,   
SYS_CONTEXT('USERENV','SESSION_USER') session_user,   
SYS_CONTEXT('USERENV','SESSION_USERID') session_userid,   
SYS_CONTEXT('USERENV','PROXY_USER') proxy_user,   
SYS_CONTEXT('USERENV','PROXY_USERID') proxy_userid,   
SYS_CONTEXT('USERENV','DB_DOMAIN') db_domain,   
SYS_CONTEXT('USERENV','DB_NAME') db_name,   
SYS_CONTEXT('USERENV','HOST') host,   
SYS_CONTEXT('USERENV','OS_USER') os_user,   
SYS_CONTEXT('USERENV','EXTERNAL_NAME') external_name,   
SYS_CONTEXT('USERENV','IP_ADDRESS') ip_address,   
SYS_CONTEXT('USERENV','NETWORK_PROTOCOL') network_protocol,   
SYS_CONTEXT('USERENV','BG_JOB_ID') bg_job_id,   
SYS_CONTEXT('USERENV','FG_JOB_ID') fg_job_id,   
SYS_CONTEXT('USERENV','AUTHENTICATION_TYPE') authentication_type,   
SYS_CONTEXT('USERENV','AUTHENTICATION_DATA') authentication_data   
from dual 
3.与系统视图v$session组合使用可以获得更多信息(客户端所使用的应用程序等) 
复制代码代码如下:
select * 
  from v$session se, 
       (select SYS_CONTEXT('USERENV', 'TERMINAL') terminal, 
               SYS_CONTEXT('USERENV', 'LANGUAGE') language, 
               SYS_CONTEXT('USERENV', 'SESSIONID') sessionid, 
               SYS_CONTEXT('USERENV', 'INSTANCE') instance, 
               SYS_CONTEXT('USERENV', 'ENTRYID') entryid, 
               SYS_CONTEXT('USERENV', 'ISDBA') isdba, 
               SYS_CONTEXT('USERENV', 'NLS_TERRITORY') nls_territory, 
               SYS_CONTEXT('USERENV', 'NLS_CURRENCY') nls_currency, 
               SYS_CONTEXT('USERENV', 'NLS_CALENDAR') nls_calendar, 
               SYS_CONTEXT('USERENV', 'NLS_DATE_FORMAT') nls_date_format, 
               SYS_CONTEXT('USERENV', 'NLS_DATE_LANGUAGE') nls_date_language, 
               SYS_CONTEXT('USERENV', 'NLS_SORT') nls_sort, 
               SYS_CONTEXT('USERENV', 'CURRENT_USER') current_user, 
               SYS_CONTEXT('USERENV', 'CURRENT_USERID') current_userid, 
               SYS_CONTEXT('USERENV', 'SESSION_USER') session_user, 
               SYS_CONTEXT('USERENV', 'SESSION_USERID') session_userid, 
               SYS_CONTEXT('USERENV', 'PROXY_USER') proxy_user, 
               SYS_CONTEXT('USERENV', 'PROXY_USERID') proxy_userid, 
               SYS_CONTEXT('USERENV', 'DB_DOMAIN') db_domain, 
               SYS_CONTEXT('USERENV', 'DB_NAME') db_name, 
               SYS_CONTEXT('USERENV', 'HOST') host, 
               SYS_CONTEXT('USERENV', 'OS_USER') os_user, 
               SYS_CONTEXT('USERENV', 'EXTERNAL_NAME') external_name, 
               SYS_CONTEXT('USERENV', 'IP_ADDRESS') ip_address, 
               SYS_CONTEXT('USERENV', 'NETWORK_PROTOCOL') network_protocol, 
               SYS_CONTEXT('USERENV', 'BG_JOB_ID') bg_job_id, 
               SYS_CONTEXT('USERENV', 'FG_JOB_ID') fg_job_id, 
               SYS_CONTEXT('USERENV', 'AUTHENTICATION_TYPE') authentication_type, 
               SYS_CONTEXT('USERENV', 'AUTHENTICATION_DATA') authentication_data 
          from dual) base 
 where se.AUDSID = base.sessionid;