发布于 2016-03-22 01:38:07 | 208 次阅读 | 评论: 0 | 来源: 网友投递

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Oracle关系数据库管理系统

Oracle Database,又名Oracle RDBMS,或简称Oracle。是甲骨文公司的一款关系数据库管理系统。到目前仍在数据库市场上占有主要份额。


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



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)


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;

 



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