Functions, 162 of 177

USERENV

Syntax

userenv::=

Text description of functions147.gif follows

Purpose

Note:

USERENV is a legacy function that is retained for backward compatibility. Oracle Corporation recommends that you use the SYS_CONTEXT function with the built-in USERENV namespace for current functionality. See SYS_CONTEXT for more information.

USERENV returns information about the current session. This information can be useful for writing an application-specific audit trail table or for determining the language-specific characters currently used by your session. You cannot use USERENV in the condition of a CHECK constraint. Table 6-3 describes the values for the parameter argument.

All calls to USERENV return VARCHAR2 data except for calls with the SESSIONID, ENTRYID, and COMMITSCN parameters, which return NUMBER.

Table 6-3 Parameters of the USERENV Function

Parameter	Return Value
`CLIENT_INFO`	`CLIENT_INFO` returns up to 64 bytes of user session information that can be stored by an application using the `DBMS_APPLICATION_INFO` package. Caution: Some commercial applications may be using this context value. Check the applicable documentation for those applications to determine what restrictions they may impose on use of this context area. See Also: Oracle9i Database Concepts for more on application context CREATE CONTEXT and SYS_CONTEXT
`ENTRYID`	`ENTRYID` returns available auditing entry identifier. You cannot use this attribute in distributed SQL statements. To use this keyword in `USERENV`, the initialization parameter `AUDIT_TRAIL` must be set to `TRUE`.
`ISDBA`	`ISDBA` returns '`TRUE`' if the user has been authenticated as having DBA privileges either through the operating system or through a password file.
`LANG`	`LANG` returns the ISO abbreviation for the language name, a shorter form than the existing '`LANGUAGE`' parameter.
`LANGUAGE`	`LANGUAGE` returns the language and territory currently used by your session along with the database character set in this form: language_territory.characterset
`SESSIONID`	`SESSIONID` returns your auditing session identifier. You cannot use this attribute in distributed SQL statements.
`TERMINAL`	`TERMINAL` returns the operating system identifier for your current session's terminal. In distributed SQL statements, this attribute returns the identifier for your local session. In a distributed environment, this is supported only for remote `SELECT` statements, not for remote `INSERT`, `UPDATE`, or `DELETE` operations.

Examples

The following example returns the LANGUAGE parameter of the current session:

SELECT USERENV('LANGUAGE') "Language" FROM DUAL;

Language
-----------------------------------
AMERICAN_AMERICA.WE8DEC