用SQL判断用户是否存在、主机名等

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用户是否存在: select * from all_users where username = '...'
select * from dba_users where username = '...'


主机名: select host_name from v$instance

客户机名: select SYS_CONTEXT('USERENV','HOST')from dual

主机IP: select utl_inaddr.get_host_address from dual

客户机IP: select SYS_CONTEXT('USERENV','IP_ADDRESS') from dual

转自【http://www.blogjava.net/Xejuny/archive/2008/12/11/245630.html】

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用SQL判断用户是否存在、主机名等