十六进制的字符串转换成十进制数字

最新推荐文章于 2025-12-22 22:02:00 发布

转载最新推荐文章于 2025-12-22 22:02:00 发布 · 1.3k 阅读

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#hex #function #null #sql #oracle

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博客介绍了在Oracle中实现不同进制转换的函数。给出了创建to_base函数的代码，该函数可将十进制数转换为指定进制的字符串。同时还展示了一个使用to_char函数进行十六进制转换的示例。

This set of routines is useful to convert between various 'bases' in Oracle:

create or replace function to_base( p_dec in number, p_base in number )
return varchar2
is
l_str varchar2(255) default NULL;
l_num number default p_dec;
l_hex varchar2(16) default '0123456789ABCDEF';
begin
if ( p_dec is null or p_base is null )
then
  return null;
end if;
if ( trunc(p_dec) <> p_dec OR p_dec < 0 ) then
  raise PROGRAM_ERROR;
end if;
loop
  l_str := substr( l_hex, mod(l_num,p_base)+1, 1 ) || l_str;
  l_num := trunc( l_num/p_base );
  exit when ( l_num = 0 );
end loop;
return l_str;
end to_base;
/

create or replace function to_dec
( p_str in varchar2,
p_from_base in number default 16 ) return number
is
l_num   number default 0;
l_hex   varchar2(16) default '0123456789ABCDEF';
begin
if ( p_str is null or p_from_base is null )
then
  return null;
end if;
for i in 1 .. length(p_str) loop
  l_num := l_num * p_from_base + instr(l_hex,upper(substr(p_str,i,1)))-1;
end loop;
return l_num;
end to_dec;
/
show errors

create or replace function to_hex( p_dec in number ) return varchar2
is
begin
return to_base( p_dec, 16 );
end to_hex;
/
create or replace function to_bin( p_dec in number ) return varchar2
is
begin
return to_base( p_dec, 2 );
end to_bin;
/
create or replace function to_oct( p_dec in number ) return varchar2
is
begin
return to_base( p_dec, 8 );
end to_oct;
/