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Oracle 中的Userenv()

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2016-06-07 15:26:181604browse

1.USEREVN() 返回当前用户环境的信息,opt可以是: ENTRYID,SESSIONID,TERMINAL,ISDBA,LABLE,LANGUAGE,CLIENT_INFO,LANG,VSIZE 1.ISDBA 查看当前用户是否是DBA如果是则返回true SQL select userenv('isdba') from dual; USEREN ------ FALSE 2.SESSION 返回会

1.USEREVN()


返回当前用户环境的信息,opt可以是:
ENTRYID,SESSIONID,TERMINAL,ISDBA,LABLE,LANGUAGE,CLIENT_INFO,LANG,VSIZE

1.ISDBA 查看当前用户是否是DBA如果是则返回true
SQL> select userenv('isdba') from dual;

USEREN
------
FALSE


2.SESSION 返回会话标志


SQL> select userenv('sessionid') from dual;

USERENV('SESSIONID')
--------------------
152


4.ENTRYID 返回会话人口标志


SQL> select userenv('entryid') from dual;

USERENV('ENTRYID')
------------------
0


5.INSTANCE 返回当前INSTANCE的标志
SQL> select userenv('instance') from dual;

USERENV('INSTANCE')
-------------------
1


6.LANGUAGE 返回当前环境变量
SQL> select userenv('language') from dual;

USERENV('LANGUAGE')
----------------------------------------------------
SIMPLIFIED CHINESE_CHINA.ZHS16GBK

7.LANG 返回当前环境的语言的缩写
SQL> select userenv('lang') from dual;

USERENV('LANG')
----------------------------------------------------
ZHS


8.TERMINAL 返回用户的终端或机器的标志
SQL> select userenv('terminal') from dual;

USERENV('TERMINA
----------------
GAO


9.VSIZE(X) 返回X的大小(字节)数
SQL> select vsize(user),user from dual;

VSIZE(USER) USER
----------- ------------------------------
6 SYSTEM

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;

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