Oracle PLSQL Demo - 24.分隔字符串function

-- refer:
-- http://www.cnblogs.com/gnielee/archive/2009/09/09/1563154.html
-- http://www.cnblogs.com/yudy/archive/2012/07/18/2597874.html

CREATE OR REPLACE TYPE ty_str_split IS TABLE OF VARCHAR2 (4000);

CREATE OR REPLACE FUNCTION splitstr(p_string IN VARCHAR2, p_delimiter IN VARCHAR2  := ',')
    RETURN ty_str_split
    PIPELINED
AS
    v_length   NUMBER := LENGTH(p_string);
    v_start    NUMBER := 1;
    v_index    NUMBER;
    v_length_delimiter NUMBER := LENGTH(p_delimiter);
BEGIN
    WHILE(v_start <= v_length) LOOP
        v_index := INSTR(p_string, p_delimiter, v_start);

        IF v_index = 0 THEN
            PIPE ROW(SUBSTR(p_string, v_start));
            v_start := v_length + 1;
        ELSE
            PIPE ROW(SUBSTR(p_string, v_start, v_index - v_start));
            v_start := v_index + v_length_delimiter;
        END IF;
    END LOOP;

    RETURN;
END splitstr;