格式化SYS_GUID()成为标准格式

                                    格式化SYS_GUID()

Oracle里面用RAW(16)保存SYS_GUID()的结果，不过字节顺序(byte order)和标准的GUID不同。如下

标准GUID： 265B113F-0E9D-F44D-A9D4-18BC4D3E836C
RAW(16) ： 3F115B26 9D0E 4DF4 A9D4 18BC4D3E836C （实际没有空格，这里是为了显示方便）

为了方便查看，可以用正则表达式进行简单的转换

create table t(x raw(16)); 

insert into t(x) 

select sys_guid() from dual connect by rownum <=5; 

commit; 

select x, 

      regexp_replace(x, 

                      '(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{4})', 

                      '\4\3\2\1-\6\5-\8\7-\9-') as fmt_x 

  from t; 

  
X                                                                 FMT_X
--------------------------------                      --------------------------------------------------------------------------------
B5D8E10BB3BCC595E040007F01000F49     0BE1D8B5-BCB3-95C5-E040-007F01000F49
B5D8E10BB3BDC595E040007F01000F49     0BE1D8B5-BDB3-95C5-E040-007F01000F49
B5D8E10BB3BEC595E040007F01000F49     0BE1D8B5-BEB3-95C5-E040-007F01000F49
B5D8E10BB3BFC595E040007F01000F49     0BE1D8B5-BFB3-95C5-E040-007F01000F49
B5D8E10BB3C0C595E040007F01000F49     0BE1D8B5-C0B3-95C5-E040-007F01000F49



PS：
本文参考了这个小工具 http://www.robobunny.com/cgi-bin/guid