oracle数据库自定义split函数

--dba授予创建类型的权限
 grant CREATE ANY TYPE to userName;
--普通用户创建
CREATE OR REPLACE TYPE type_str IS TABLE OF VARCHAR2 (100) ;
 -- 再创建split函数，代码如下：
CREATE
OR REPLACE FUNCTION SPLIT (
    p_str VARCHAR2,
    p_delimiter VARCHAR2 DEFAULT ','
) RETURN type_str IS rs type_str := type_str () ; l_str VARCHAR2 (4000) := '' ; l_len NUMBER := 0 ;
BEGIN
    l_str := p_str ; l_len := LENGTH (p_delimiter) ; while LENGTH (l_str) > 0 loop
IF INSTR (l_str, p_delimiter) > 0 THEN
    rs. EXTEND ; rs (rs. COUNT) := SUBSTR (
        l_str,
        1,
        INSTR (l_str, p_delimiter) - 1
    ) ; l_str := SUBSTR (
        l_str,
        INSTR (l_str, p_delimiter) + l_len
    ) ;
ELSE
    rs. EXTEND ; rs (rs. COUNT) := l_str ; exit ;
END
IF ;
END loop ; RETURN rs ;
END ; 
-- 测试
SELECT
    COLUMN_VALUE
FROM
    TABLE (
        SPLIT ('1001,1002,1003', ',')
    ) ; 
SELECT
        TO_NUMBER (COLUMN_VALUE)
    FROM
        TABLE (SPLIT('1001,1002,1003')) ;