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;

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