oracle 函数判断字符串是否包含图片格式的实例代码

CREATE OR REPLACE FUNCTION fn_split (p_str IN VARCHAR2, p_delimiter IN VARCHAR2)RETURN ty_str_splitIS  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;

create or replace function fn_ispng(                     strpng  in varchar2                     ) return number is v_num  number;begin   WITH t1 AS  (select * from table (fn_split(strpng,'.'))  ) select count(1) into v_num from t1 where t1.column_value in ('png', 'jpg','jpeg','gif','bmp','eps'); return v_num;end fn_ispng;

select fn_ispng('dfdfd.png')   from dual;