使用IF語句創建SQL存儲過程

Question

我正在嘗試在PHPmyadmin中創建一個存儲過程，但它似乎不喜歡我的IF語句。 誰能幫我確定我做錯了什么：

SQL：

CREATE PROCEDURE get_products_in_category(IN inCategoryID INT, 
IN inShortDescriptionLength INT, IN inProductsPerPage INT, IN inStartItem INT)

BEGIN
"SELECT p.productID, p.name, IF(LENGTH(p.description) <= ?, p.description, 
 CONCAT(LEFT(p.description, ?), '...')) AS description, p.price, p.discounted_price, 
 p.thumbnail FROM tblProducts p

INNER JOIN tblProdCat pc
ON pc.productID = p.productID
WHERE tblProdCat.categoryID = ?
ORDER BY p.display DESC
LIMIT ?, ?";

SET @p1 = inShortDescriptionLength;
SET @p2 = inShortDescriptionLength;
SET @p3 = inCategoryID;
SET @p4 = inStartItem;
SET @p5 = inProductsPerPage;

END$$

我收到以下錯誤消息：

您的SQL語法有誤； 檢查與您的MySQL服務器版本相對應的手冊以獲取正確的語法，以在第3行的'''SELECT p.productID，p.name，IF（LENGTH（p.description）<=？，p.description，CONCA'）附近使用

Answer 1

我認為您想執行動態SQL ，

DELIMITER $$
CREATE PROCEDURE get_products_in_category
(
    IN inCategoryID INT, 
    IN inShortDescriptionLength INT, 
    IN inProductsPerPage INT, 
    IN inStartItem INT
)
BEGIN

    SET @sql = CONCAT('SELECT   p.productID, 
                                p.name, 
                                IF(CHAR_LENGTH(p.description) <= ?, p.description, CONCAT(LEFT(p.description, ?), ''...'')) AS description, 
                                p.price, 
                                p.discounted_price, 
                                p.thumbnail 
                        FROM    tblProducts p
                                INNER JOIN tblProdCat pc
                                    ON pc.productID = p.productID
                        WHERE   pc.categoryID = ?
                        ORDER   BY p.display DESC
                        LIMIT   ',inStartItem, ', ',inProductsPerPage);



    PREPARE stmt1 FROM @sql;
    SET @p1 = inShortDescriptionLength;
    SET @p2 = inShortDescriptionLength;
    SET @p3 = inCategoryID;

    EXECUTE stmt1 USING @p1, @p2, @p3;
    DEALLOCATE PREPARE stmt1;
END $$
DELIMITER ;

• 預備語句的SQL語法