ORACLE应用经验(4)-加密程序

时间： 2021-07-31 作者：daque

-------------1. 加密步调数据库触发子scjmmm----------------------rem 对ghxxb制立数据库触发子(当insert or update ghxxb时触发)drop trigger scjmmm;create or replace trigger scjmmm before insert or update of mm on ghxxb for each rowbegin :new.mm:=encrypt(:new.mm,:new.gh,to_char(sysdate,'ss'));end;/-------------2. 暗号的加密步调encrypt----------------------create or replace function encrypt (inpass in varchar2,in_gh in varchar2,in_ss in varchar2) return varchar2 is bcs varchar2(20); bcs1 number; cs number; jg number; m_gh varchar2(4); m_mm varchar2(20);begin m_gh:=in_gh; m_mm:=inpass; cs:=to_number(in_ss); if cs bcs:=substr(to_char(ascii(substr(m_gh,1,1))),1,2); if bcs m_gh:=substr(m_gh,2); loop exit when nvl(length(m_gh),0)=0 ; bcs:=bcs||substr(to_char(ascii(substr(m_gh,1,1))),-1,1); m_gh:=substr(m_gh,2); end loop; loop exit when nvl(length(m_mm),0)=0 ; bcs:=bcs||substr(to_char(ascii(substr(m_mm,1,1))),-1,1); m_mm:=substr(m_mm,2); end loop; bcs1:=to_number(bcs); jg:=cs*bcs1; loop exit when length(to_char(jg))>13; jg:=jg*cs ; end loop; return(in_ss||substr(to_char(jg),1,14));end;/grant execute on encrypt to public;

ORACLE应用经验(4)-加密程序

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