实现 split 函数

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;
/

测试：

DECLARE
    CURSOR c
    IS
        SELECT *
          FROM TABLE (CAST (fn_split ('1;;12;;123;;1234;;12345', ';;') AS ty_str_split
                           )
                     );

    r c%ROWTYPE;
BEGIN
    OPEN c;

    LOOP
        FETCH c INTO r;

        EXIT WHEN c%NOTFOUND;
        DBMS_OUTPUT.put_line (r.column_value);
    END LOOP;

    CLOSE c;
END;
/