使用相同的參數多次

Question

Mysql的預處理語句我寫存儲過程是這樣的：

DELIMITER $$ 
    CREATE PROCEDURE searchByTerm(term VARCHAR(300)) 
    BEGIN 
    SET @statment = "Select name,description from products where name like '%?%' OR description like '%?%'"; 
    PREPARE stmt FROM @statment; 
    SET @a = term; 
    SET @b = term; 
    EXECUTE stmt USING @a,@b; 
    DEALLOCATE PREPARE stmt; 
    END$$ 

稱其爲：

CALL searchByTerm('xyz'); 

它導致以下錯誤：

Error Code : 1210 
Incorrect arguments to EXECUTE 

上午我做任何錯誤？我知道它可以用concat語句完成，但爲什麼它不能像這樣工作？我不能多次使用相同的參數嗎？感謝您的幫助..

Answer 1

使用CONCAT在查詢

SET @statment = "Select name,description 
       from products 
       where name like CONCAT('%', ? ,'%') OR 
         description like CONCAT('%', ? ,'%')"; 

如此完整的查詢看起來像這樣，

DELIMITER $$ 
CREATE PROCEDURE searchByTerm(term VARCHAR(300)) 
    BEGIN 
    SET @statment = "Select name,description 
        from products 
        where name like CONCAT('%', ? ,'%') OR 
          description like CONCAT('%', ? ,'%')"; 
    PREPARE stmt FROM @statment; 
    SET @a = term; 
    SET @b = term; 
    EXECUTE stmt USING @a,@b; 
    DEALLOCATE PREPARE stmt; 
    END$$