oracle二次开发中的一些小细节(转载)
oracle二次开发中的一些小细节(转载)
oracle二次开发中的一些小细节
oracle的一些有用的环境变量
select sys_context('USERENV','LANG') FROM DUAL
(Extracted from SQL Reference Documentation)
TERMINAL The operating system identifier for the client of the
current session. In distributed SQL statements, this
option returns the identifier for your local session.
In a distributed environment, this is supported only
for remote SELECTs, not for remote INSERTs, UPDATEs,
or DELETEs. (The return length of this parameter may
vary by operating system.)
LANGUAGE The language and territory currently used by your session,
along with the database character set, in this form:
language_territory.characterset
LANG The ISO abbreviation for the language name, a shorter form than the existing 'LANGUAGE' parameter.
SESSIONID The auditing session identifier. You cannot use this
option in distributed SQL statements.
INSTANCE The instance identification number of the current instance.
ENTRYID The available auditing entry identifier. You cannot use
this option in distributed SQL statements. To use this
keyword in USERENV, the initialization parameter AUDIT_TRAIL
must be set to TRUE.
ISDBA TRUE if you currently have the DBA role enabled and FALSE
if you do not.
CLIENT_INFO Returns up to 64 bytes of user session information that can
be stored by an application using the DBMS_APPLICATION_INFO
package.
NLS_TERRITORY The territory of the current session.
NLS_CURRENCY The currency of the current session.
NLS_CALENDAR The current calendar of the current session.
NLS_DATE_FORMAT The date format for the session.
NLS_DATE_LANGUAGE The language used for expressing dates.
NLS_SORT BINARY or the linguistic sort basis.
CURRENT_USER The name of the user whose privilege the current session is
under.
CURRENT_USERID User ID of the user whose privilege the current session is
under.
SESSION_USER Database user name by which the current user is authenticated.
This value remains the same throughout the duration of the
session.
SESSION_USERID Identifier of the database user name by which the current
user is authenticated.
CURRENT_SCHEMA Name of the default schema being used in the current schema.
This value can be changed during the session with an ALTER
SESSION SET CURRENT_SCHEMA statement.
CURRENT_SCHEMAID Identifier of the default schema being used in the current
session.
PROXY_USER Name of the database user who opened the current session on
behalf of SESSION_USER.
PROXY_USERID Identifier of the database user who opened the current session
on behalf of SESSION_USER.
DB_DOMAIN Domain of the database as specified in the DB_DOMAIN
initialization parameter.
DB_NAME Name of the database as specified in the DB_NAME
initialization parameter.
HOST Name of the host machine from which the client has connected.
OS_USER Operating system username of the client process that initiated
the database session.
EXTERNAL_NAME External name of the database user. For SSL authenticated
sessions using V.503 certificates, this field returns the
distinguished name (DN) stored in the user certificate.
IP_ADDRESS IP address of the machine from which the client is connected.
NETWORK_PROTOCOL Network protocol being used for communication, as specified
in the 'PROTOCOL=protocol' portion of the connect string.
BG_JOB_ID Job ID of the current session if it was established by an
Oracle background process. Null if the session was not
established by a background process.
FG_JOB_ID Job ID of the current session if it was established by a
client foreground process. Null if the session was not
established by a foreground process.
AUTHENTICATION_TYPE How the user was authenticated:
DATABASE: Username/password authentication.
OS: Operating system external user authentication.
NETWORK: Network protocol or ANO authentication.
PROXY: OCI proxy connection authentication.
AUTHENTICATION_DATA Data being used to authenticate the login user. For
X.503 certificate authenticated sessions, this field
returns the context of the certificate in HEX2 format.
Note: You can change the return value of the AUTHENTICATION_DATA
attribute using the length parameter of the syntax. Values of
up to 4000 are accepted. This is the only attribute of USERENV
for which Oracle implements such a change.
例子：
select userenv('CLIENT_INFO')
from dual
select sys_context('USERENV','LANG') FROM DUAL
select sys_context('USERENV','LANG') FROM DUAL
(Extracted from SQL Reference Documentation)
TERMINAL The operating system identifier for the client of the
current session. In distributed SQL statements, this
option returns the identifier for your local session.
In a distributed environment, this is supported only
for remote SELECTs, not for remote INSERTs, UPDATEs,
or DELETEs. (The return length of this parameter may
vary by operating system.)
LANGUAGE The language and territory currently used by your session,
along with the database character set, in this form:
language_territory.characterset
LANG The ISO abbreviation for the language name, a shorter form than the existing 'LANGUAGE' parameter.
SESSIONID The auditing session identifier. You cannot use this
option in distributed SQL statements.
INSTANCE The instance identification number of the current instance.
ENTRYID The available auditing entry identifier. You cannot use
this option in distributed SQL statements. To use this
keyword in USERENV, the initialization parameter AUDIT_TRAIL
must be set to TRUE.
ISDBA TRUE if you currently have the DBA role enabled and FALSE
if you do not.
CLIENT_INFO Returns up to 64 bytes of user session information that can
be stored by an application using the DBMS_APPLICATION_INFO
package.
NLS_TERRITORY The territory of the current session.
NLS_CURRENCY The currency of the current session.
NLS_CALENDAR The current calendar of the current session.
NLS_DATE_FORMAT The date format for the session.
NLS_DATE_LANGUAGE The language used for expressing dates.
NLS_SORT BINARY or the linguistic sort basis.
CURRENT_USER The name of the user whose privilege the current session is
under.
CURRENT_USERID User ID of the user whose privilege the current session is
under.
SESSION_USER Database user name by which the current user is authenticated.
This value remains the same throughout the duration of the
session.
SESSION_USERID Identifier of the database user name by which the current
user is authenticated.
CURRENT_SCHEMA Name of the default schema being used in the current schema.
This value can be changed during the session with an ALTER
SESSION SET CURRENT_SCHEMA statement.
CURRENT_SCHEMAID Identifier of the default schema being used in the current
session.
PROXY_USER Name of the database user who opened the current session on
behalf of SESSION_USER.
PROXY_USERID Identifier of the database user who opened the current session
on behalf of SESSION_USER.
DB_DOMAIN Domain of the database as specified in the DB_DOMAIN
initialization parameter.
DB_NAME Name of the database as specified in the DB_NAME
initialization parameter.
HOST Name of the host machine from which the client has connected.
OS_USER Operating system username of the client process that initiated
the database session.
EXTERNAL_NAME External name of the database user. For SSL authenticated
sessions using V.503 certificates, this field returns the
distinguished name (DN) stored in the user certificate.
IP_ADDRESS IP address of the machine from which the client is connected.
NETWORK_PROTOCOL Network protocol being used for communication, as specified
in the 'PROTOCOL=protocol' portion of the connect string.
BG_JOB_ID Job ID of the current session if it was established by an
Oracle background process. Null if the session was not
established by a background process.
FG_JOB_ID Job ID of the current session if it was established by a
client foreground process. Null if the session was not
established by a foreground process.
AUTHENTICATION_TYPE How the user was authenticated:
DATABASE: Username/password authentication.
OS: Operating system external user authentication.
NETWORK: Network protocol or ANO authentication.
PROXY: OCI proxy connection authentication.
AUTHENTICATION_DATA Data being used to authenticate the login user. For
X.503 certificate authenticated sessions, this field
returns the context of the certificate in HEX2 format.
Note: You can change the return value of the AUTHENTICATION_DATA
attribute using the length parameter of the syntax. Values of
up to 4000 are accepted. This is the only attribute of USERENV
for which Oracle implements such a change.
例子：
select userenv('CLIENT_INFO')
from dual
select sys_context('USERENV','LANG') FROM DUAL
来自 “ ITPUB博客 ” ，链接：http://blog.itpub.net/41594/viewspace-50542/，如需转载，请注明出处，否则将追究法律责任。
转载于:http://blog.itpub.net/41594/viewspace-50542/