oracle – 将逗号分隔的字符串转换为PL/SQL中的数组

如何将逗号分隔的字符串转换为数组？

我有输入’1,2,3’，我需要将其转换为数组。

Oracle提供了一个内置函数：dbms_utility.comma_to_table( http://download.oracle.com/docs/cd/E11882_01/appdev.112/e16760/d_util.htm#ARPLS73224)。

不幸的是，这个不适用于数字：

sql> declare
  2    l_input varchar2(4000) := '1,3';
  3    l_count binary_integer;
  4    l_array dbms_utility.lname_array;
  5  begin
  6    dbms_utility.comma_to_table
  7    ( list   => l_input
  8,tablen => l_count
  9,tab    => l_array
 10    );
 11    dbms_output.put_line(l_count);
 12    for i in 1 .. l_count
 13    loop
 14      dbms_output.put_line
 15      ( 'Element ' || to_char(i) ||
 16        ' of array contains: ' ||
 17        l_array(i)
 18      );
 19    end loop;
 20  end;
 21  /
declare
*
ERROR at line 1:
ORA-00931: missing identifier
ORA-06512: at "SYS.DBMS_UTILITY",line 132
ORA-06512: at "SYS.DBMS_UTILITY",line 164
ORA-06512: at "SYS.DBMS_UTILITY",line 218
ORA-06512: at line 6

但有一个小技巧，用“x”作为前缀元素，它的工作原理：

sql> declare
  2    l_input varchar2(4000) := '1,3';
  3    l_count binary_integer;
  4    l_array dbms_utility.lname_array;
  5  begin
  6    dbms_utility.comma_to_table
  7    ( list   => regexp_replace(l_input,'(^|,)','\1x')
  8,tab    => l_array
 10    );
 11    dbms_output.put_line(l_count);
 12    for i in 1 .. l_count
 13    loop
 14      dbms_output.put_line
 15      ( 'Element ' || to_char(i) ||
 16        ' of array contains: ' ||
 17        substr(l_array(i),2)
 18      );
 19    end loop;
 20  end;
 21  /
3
Element 1 of array contains: 1
Element 2 of array contains: 2
Element 3 of array contains: 3

PL/sql procedure successfully completed.

问候，抢。