整数是唯一不支持.__class__操作的类型吗？例如：
>>> ....__class__
<class 'ellipsis'>
>>> 'a'.__class__
<class 'str'>
>>> 2.44.__class__
<class 'float'>
>>> 1.__class__
File "<stdin>", line 1
有没有办法解决这个问题？
答案 0 :(得分：3)
它受支持，但是DROP Sequence Seed_ID;
Create Sequence Seed_ID INCREMENT BY 1 Start with 1;
DECLARE
fw UTL_FILE.FILE_TYPE;
fr UTL_FILE.FILE_TYPE;
textOut Varchar2(2000); ----Store All txt file
Seed_word Varchar2(2000); -----Seed words store
i number; -----Incramenter for Category ID
match_var VARCHAR(255); ---Use to mathc the category with seed words
mvi number; -- match var incramenter
BEGIN
fr := UTL_FILE.FOPEN('FILE_READ_WRITE', 'seed.txt', 'r');
fw := UTL_FILE.FOPEN('FILE_READ_WRITE', 'seed2.csv', 'w');
LOOP
BEGIN
i :=1;
mvi := 1;
UTL_FILE.GET_LINE(fr,textOut);
match_var := REGEXP_SUBSTR (textOut, '[^,]+' ,1,1); --- gets first word in each line
UPDATE Category2 ---Should this insert the values int the Category tablE??????????
SET Category_ID= mvi, Category_name= textout
WHERE mvi = CATEGORY_ID;
mvi := mvi+1;
WHILE TRUE LOOP
BEGIN
Seed_word := REGEXP_SUBSTR (textOut, '[^,]+' ,1,i+1);
i := i+1;
EXIT WHEN seed_word IS NULL;
UTL_FILE.PUT_LINE(fw,Seed_ID.nextval ||','||Seed_word||','||mvi);
END;
END LOOP;
END;
END LOOP;
EXCEPTION
WHEN OTHERS THEN
dbms_output.put_line(SQLERRM);
UTL_FILE.FCLOSE(fr);
UTL_FILE.FCLOSE(fw);
END;
被解析为浮点文字。
有没有办法解决这个问题？
是的，有几种方法：
1.