oracle函数 SYS_CONTEXT(c1,c2)

【功能】返回系统c1对应的c2的值。可以使用在SQL/PLSQL中，但不可以用在并行查询或者RAC环境中

【参数】

c1，'USERENV'

c2,参数表，详见示例

【返回】字符串

【示例】

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