Oracle拆分字符串函数

功能：根据','拆分字符串: 返回一个数组

1.首先必须要在Type包下面创建类型
CREATE OR REPLACE TYPE str_split IS TABLE OF VARCHAR2 (4000);

2.创建Function
CREATE OR REPLACE FUNCTION splitstr(p_string IN VARCHAR2, p_delimiter IN VARCHAR2)
  RETURN str_split
  PIPELINED
AS
  v_length  NUMBER := LENGTH(p_string);
  v_start  NUMBER := 1;
  v_index  NUMBER;
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 + 1;
    END IF;
  END LOOP;
  RETURN;
END splitstr;

3.测试
SELECT * FROM TABLE(splitstr('Henry,Huang',','));

4.行列转换
SELECT a.column_value name1,b.column_value name1 FROM　
(SELECT * FROM (SELECT rownum rn,t.* FROM table(splitstr('Henry,Huang',',')) t)) a,　
(SELECT * FROM (SELECT rownum rn,t.* FROM table(splitstr('Henry,Huang',',')) t)) b　
WHERE a.rn=1 and b.rn=2