oracle数据库split()方法的实现与测试

1 参考资料: http://sonic10101.iteye.com/blog/394187
2 具体SQL:

CREATE OR REPLACE TYPE ty_str_split IS TABLE OF VARCHAR2 (4000)
CREATE OR REPLACE FUNCTION fn_split (p_str IN VARCHAR2, p_delimiter IN VARCHAR2)
    RETURN ty_str_split
IS
    j INT := 0;
    i INT := 1;
    len INT := 0;
    len1 INT := 0;
    str VARCHAR2 (4000);
    str_split ty_str_split := ty_str_split ();
BEGIN
    len := LENGTH (p_str);
    len1 := LENGTH (p_delimiter);

    WHILE j < len
    LOOP
        j := INSTR (p_str, p_delimiter, i);

        IF j = 0
        THEN
            j := len;
            str := SUBSTR (p_str, i);
            str_split.EXTEND;
            str_split (str_split.COUNT) := str;

            IF i >= len
            THEN
                EXIT;
            END IF;
        ELSE
            str := SUBSTR (p_str, i, j - i);
            i := j + len1;
            str_split.EXTEND;
            str_split (str_split.COUNT) := str;
        END IF;
    END LOOP;

    RETURN str_split;
END fn_split;

3 测试SQL

select fn_split('1,2,3,4,',',') from dual;
select t.* from (SELECT *   FROM TABLE (CAST (fn_split ('1;;12;;123;;1234;;12345', ';;') AS ty_str_split)))t