oracle split() 函数

create type tabletype is table of varchar2(3000);
CREATE OR REPLACE FUNCTION split (p_list CLOB, p_sep VARCHAR2 := ',')
RETURN tabletype
PIPELINED
/**************************************
* Name: split
* Author: Sean Zhang.
* Date: 2012-09-03.
* Function: 返回字符串被指定字符分割后的表类型。
* Parameters: p_list: 待分割的字符串。
p_sep: 分隔符，默认逗号，也可以指定字符或字符串。
* Example: SELECT *
FROM users
WHERE u_id IN (SELECT COLUMN_VALUE
FROM table (split ('1,2')))
返回u_id为1和2的两行数据。
**************************************/
IS
l_idx PLS_INTEGER;
v_list VARCHAR2 (32676) := p_list;
BEGIN
LOOP
l_idx := INSTR (v_list, p_sep);
IF l_idx > 0
THEN
PIPE ROW (SUBSTR (v_list, 1, l_idx - 1));
v_list := SUBSTR (v_list, l_idx + LENGTH (p_sep));
ELSE
PIPE ROW (v_list);
EXIT;
END IF;
END LOOP;
END;

--test code 
select * from table(split('1,2,3,4,5,6',','));