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用戶是否存在: select * from all_users where username = '...'
select * from dba_users where username = '...'


主機(jī)名: select host_name from v$instance

客戶機(jī)名: select SYS_CONTEXT('USERENV','HOST')from dual

主機(jī)IP: select utl_inaddr.get_host_address from dual

客戶機(jī)IP: select SYS_CONTEXT('USERENV','IP_ADDRESS') from dual

轉(zhuǎn)自【http://www.blogjava.net/Xejuny/archive/2008/12/11/245630.html】

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用SQL判斷用戶是否存在、主機(jī)名等