# oracle中进制转换函数

1.16进制转换为10进制

 SQL> select to_number('19f','xxx') from dual; TO_NUMBER('19F','XXX')----------------------415 SQL> select to_number('f','xx') from dual; TO_NUMBER('F','XX')-------------------15

2.10进制转换为16进制

 SQL> select to_char(123,'xxx') from dual; TO_C----7b SQL> select to_char(4567,'xxxx') from dual; TO_CH-----11d7

3.2进制转换为10进制

 SQL> select bin_to_num(1,1,0,1) a,bin_to_num(1,0) b from dual; A B----- ----------13 2 SQL> select bin_to_num(1,1,1,0,1) from dual; BIN_TO_NUM(1,1,1,0,1)---------------------29

3.进制转换也可以通过自定义函数实现

 create or replace function to_base( p_dec in number, p_base in number ) return varchar2isl_str varchar2(255) default NULL;l_num number default p_dec;l_hex varchar2(16) default '0123456789ABCDEF';beginif ( trunc(p_dec) <> p_dec OR p_dec < 0 ) thenraise PROGRAM_ERROR;end if;loopl_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 numberisl_num number default 0;l_hex varchar2(16) default '0123456789ABCDEF';beginfor i in 1 .. length(p_str) loopl_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 varchar2isbeginreturn to_base( p_dec, 16 );end to_hex;/create or replace function to_bin( p_dec in number ) return varchar2isbeginreturn to_base( p_dec, 2 );end to_bin;/create or replace function to_oct( p_dec in number ) return varchar2isbeginreturn to_base( p_dec, 8 );end to_oct;/

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