如何獲取導致動態MySQL存儲過程

Question

空參數值我有表名table_abc它包含coloumns name varchar(255) NOT NULL,store_id INT(11) NOT NULL,brand varchar(255) NOT NULL,status INT(11) NOT NULL。

表 -

name | store_id | brand |  status 
    dress  1   only   1 
    dress  2  vero moda  1 
    dress  2   ZARA   1 
    dress  2  vero moda  1 
    dress  3   only   1 
    dress  3  vero moda  1 
    dress  1   only   1 
    dress  2  ZARA   1 

現在我要動態的結果，如果在參數傳遞NULL或空''值，那麼它可以給particuler參數作爲結果的完整行。例如：

delimiter // 
    DROP PROCEDURE IF EXISTS sp_test// 
    CREATE PROCEDURE sp_test(
    list_of_name VARCHAR(255), 
    list_of_ids VARCHAR(100), 
    list_of_brand VARCHAR(100)) 
    BEGIN 
     SET @query := CONCAT("SELECT name,store_id,brand,status FROM `table_abc` 
    WHERE name in (" , list_of_name ,") AND status='1' 
    AND store_id in (" , list_of_ids OR list_of_ids IS NULL, ") 
    AND brand in (" , list_of_brand , ") 
    ORDER BY RAND() LIMIT 0,16"); 
     PREPARE stmt FROM @query; 
     EXECUTE stmt; 
     DEALLOCATE PREPARE stmt; 
     END// 
     delimiter ; 

我們試圖用null值參數得到結果。但store_id無法在此過程中使用。或者null也不起作用。 請幫助

• mysql> call sp_test("'dress'",'1,2,3',"'only','vero moda','ZARA'");
• mysql> call sp_test("'dress'",null,"'only','vero moda','ZARA'");
• mysql> call sp_test("'dress'",'null',"'only','vero moda','ZARA'");

Answer 1

嘗試這樣的事情（我沒有測試腳本，所以你可能需要調整它一點）

delimiter // 
    DROP PROCEDURE IF EXISTS sp_test// 
    CREATE PROCEDURE sp_test(
    list_of_name VARCHAR(255), 
    list_of_ids VARCHAR(100), 
    list_of_brand VARCHAR(100)) 
    BEGIN 
     SET @query := CONCAT("SELECT name,store_id,brand,status FROM `table_abc` 
    WHERE name in (" , list_of_name ,") AND status='1' 
    + CASE WHEN ISNULL(list_of_ids,'') <> '' THEN "AND store_id in (" + list_of_ids + ") 
    AND brand in (" , list_of_brand , ") 
    ORDER BY RAND() LIMIT 0,16"); 
     PREPARE stmt FROM @query; 
     EXECUTE stmt; 
     DEALLOCATE PREPARE stmt; 
     END// 
     delimiter ;