oracle 实现 split 函数

oracle 实现 split 函数 (返回数组）

功能描述：用指定分隔符切割输入的字符串，返回一维数组，每个数组元素为一个子串。

源代码：

 

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;

/

 

结果：

1

12

123

1234

12345