MYSQL函数与if elseif else

Question

我如何将其放在可以使用设置值的函数中，例如函数xy（@ q，@ p）

SET @q='10';
SET @p='5';
SELECT @a_rows := COUNT(*) FROM 'main1' WHERE status='0' && price<= @p && quantity >     '0';

IF @a_rows = '0' THEN

INSERT INTO detail1 (quantity,price,status) VALUES (@q,@p,'0');
INSERT INTO detail2 (quantity,price,status) VALUES (@q,@p,'0');

ELSEIF @a_rows='1' THEN
INSERT INTO detail3 (quantity,price,status) VALUES (@q,@p,'0');

ELSE 
; 
ENDIF

Answer 1

做到我在上一条评论中所说的...只是使用一个案例。 像这样

注意：您不能只运行一堆插入程序，而必须分别装入每个插入器...

SET @q='10';
SET @p='5';
SELECT @a_rows := COUNT(*) FROM 'main1' WHERE status='0' && price<= @p && quantity >     '0';

INSERT INTO detail1 (quantity,price,status)
values
(
    (CASE @a_rows WHEN 0 THEN @q ELSE NULL END),
    (CASE @a_rows WHEN 0 THEN @p ELSE NULL END),
    (CASE @a_rows WHEN 0 THEN 0 ELSE NULL END)
);

INSERT INTO detail2 (quantity,price,status)
values
(
    (CASE @a_rows WHEN 0 THEN @q ELSE NULL END),
    (CASE @a_rows WHEN 0 THEN @p ELSE NULL END),
    (CASE @a_rows WHEN 0 THEN 0 ELSE NULL END)
);

INSERT INTO detail3 (quantity,price,status)
values
(
    (CASE @a_rows WHEN 1 THEN @q ELSE NULL END),
    (CASE @a_rows WHEN 1 THEN @p ELSE NULL END),
    (CASE @a_rows WHEN 1 THEN 0 ELSE NULL END)
);

演示

Answer 2

你可以试试这个

CASE @a_rows 
WHEN 0 THEN
    INSERT INTO detail1 (quantity,price,status) VALUES (@q,@p,'0');
    INSERT INTO detail2 (quantity,price,status) VALUES (@q,@p,'0');
WHEN 1 THEN
    INSERT INTO detail3 (quantity,price,status) VALUES (@q,@p,'0');
ELSE 
    #If neither 0 or 1 
END CASE;