原文: http://blog.itpub.net/29371470/viewspace-1081319/ [oracle@rhel ~]$ sqlplus / as sysdba SQL*Plus: Release 10.2.0.5.0 - Production on Sat Feb 8 12:51:15 2014 Copyright (c) 1982, 2010, Oracle.? All Rights Reserved. Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - Production With the Partitioning, OLAP, Data Mining and Real Application Testing options SQL> create user lsq identified by lsq; User created. SQL> grant connect, resource to lsq; Grant succeeded. SQL> conn lsq/lsq Connected. SQL> disc Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - Production With the Partitioning, OLAP, Data Mining and Real Application Testing options SQL> conn / as sysdba Connected. SQL> CREATE OR REPLACE TRIGGER limit_connection ? 2?????? AFTER LOGON ON DATABASE ? 3??? BEGIN ? 4?????? IF USER = 'LSQ' THEN ? 5????????? IF to_number(TO_CHAR (SYSDATE, 'hh24')) BETWEEN 8 AND 22 ? 6????????? THEN ? 7???????????? RAISE_APPLICATION_ERROR(-20998,' Dear user '||USER||'! You can''t login between 08 and 22'); ? 8????????? END IF; ? 9?????? END IF; 10?? END limit_connection; 11?? / Trigger created. SQL> select to_char(sysdate,'hh24') from dual; TO -- 12 SQL> conn lsq/lsq ERROR: ORA-00604: error occurred at recursive SQL level 1 ORA-20998:? Dear user LSQ! You can't login between 08 and 22 ORA-06512: at line 5 Warning: You are no longer connected to ORACLE.

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