oracle 函數判斷字元串是否包含圖片格式

首先是寫一個分割字元串的函數，返回table類型

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;

上面這個函數可以將字元串分割返回table

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;

上面這個是判斷是否是圖片格式，的圖片格式返回1

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