如何在过滤SELECT结果之前在参数上添加“ IF NOT NULL”检查? 我尝试了在SE上找到的各种变体,但似乎没有一个对我有用,IF()-THEN-END IF ...使用MariaDB,也许还有其他记号吗?
DELIMITER //
CREATE PROCEDURE IzvjestajRacuna (
IN p_DatumOd DATETIME,
IN p_DatumDo DATETIME,
in p_ArtiklID INTEGER,
IN p_PoslovnicaID INTEGER,
IN p_KupacID INTEGER,
IN p_RadnikID INTEGER
)
BEGIN
SELECT Racun.* FROM Racun
INNER JOIN RacunStavka ON Racun.RacunID=RacunStavka.RacunID
AND RacunStavka.ArtiklID=p_ArtiklID
AND Racun.KupacID=p_KupacID
AND Racun.RadnikID=p_RadnikID
INNER JOIN Radnik on Racun.RadnikID = Radnik.RadnikID
AND Radnik.PoslovnicaID=p_PoslovnicaID
WHERE CAST(Racun.DatumVrijeme AS date) >= p_DatumOd
AND CAST(Racun.DatumVrijeme AS date) <= p_DatumDo;
END //
DELIMITER ;
call IzvjestajRacuna('2020-02-22','2020-02-25', 15, 25, 9, 35);
call IzvjestajRacuna(null, null, 15, 25, 9, 35);
答案 0 :(得分:0)
您可以在过程中使用准备好的语句。
这是更新的SQL。
DELIMITER //
CREATE PROCEDURE IzvjestajRacuna (
IN p_DatumOd DATETIME,
IN p_DatumDo DATETIME,
IN p_ArtiklID INTEGER,
IN p_PoslovnicaID INTEGER,
IN p_KupacID INTEGER,
IN p_RadnikID INTEGER
)
BEGIN
-- Assumed that if a parameter is null, we would find rows with null value on date column.
SET @where1 = IF(p_DatumOd IS NULL, " AND CAST(Racun.DatumVrijeme AS date) IS NULL", CONCAT(" AND CAST(Racun.DatumVrijeme AS date) >= ", p_DatumOd));
SET @where2 = IF(p_DatumDo IS NULL, " AND CAST(Racun.DatumVrijeme AS date) IS NULL", CONCAT(" AND CAST(Racun.DatumVrijeme AS date) <= ", p_DatumDo));
SET @sql_query = CONCAT(
"
SELECT Racun.* FROM Racun
INNER JOIN RacunStavka ON Racun.RacunID=RacunStavka.RacunID
AND RacunStavka.ArtiklID=p_ArtiklID
AND Racun.KupacID=p_KupacID
AND Racun.RadnikID=p_RadnikID
INNER JOIN Radnik ON Racun.RadnikID = Radnik.RadnikID
AND Radnik.PoslovnicaID=p_PoslovnicaID
WHERE TRUE
", @where1, @where2
) ;
PREPARE stmt FROM @sql_query ;
EXECUTE stmt;
DEALLOCATE PREPARE stmt ;
END //
DELIMITER ;
答案 1 :(得分:0)
如果您的列中确实有值,则可以使用ifnull
。
CREATE PROCEDURE IzvjestajRacuna (
p_DatumOd DATETIME,
p_DatumDo DATETIME,
p_ArtiklID INTEGER,
p_PoslovnicaID INTEGER,
p_KupacID INTEGER,
p_RadnikID INTEGER
)
BEGIN
SELECT Racun.*
FROM Racun
INNER JOIN RacunStavka ON Racun.RacunID=RacunStavka.RacunID
AND RacunStavka.ArtiklID=ifnull(p_ArtiklID, RacunStavka.ArtiklID)
AND Racun.KupacID=ifnull(p_KupacID, Racun.KupacID)
AND Racun.RadnikID=ifnull(p_RadnikID, Racun.RadnikID)
INNER JOIN Radnik on Racun.RadnikID = Radnik.RadnikID
AND Radnik.PoslovnicaID=ifnull(p_PoslovnicaID, Radnik.PoslovnicaID)
WHERE CAST(Racun.DatumVrijeme AS date) >= ifnull(p_DatumOd, Racun.DatumVrijeme)
AND CAST(Racun.DatumVrijeme AS date) <= ifnull(p_DatumDo, Racun.DatumVrijeme);
END //
答案 2 :(得分:0)
COALESCE(might_be_null, fallback_value)