MySQL筆記（八）存儲過程練習&補充

 存儲過程有什么優缺點？為什么要用存儲過程？或者在什么情況下才用存儲過程？

 最直白的好處是存儲過程比較快。

 

1、利用存儲過程，給Employee表添加一條業務部門員工的信息。

DROP PROCEDURE IF EXISTS insert_business_employee;
DELIMITER //

CREATE PROCEDURE insert_business_employee(
    IN employee_no_in varchar(8),
    IN employee_name_in varchar(10),
    IN sex_in char(1),
    IN birthday_in date,
    IN address_in varchar(50),
    IN telephone_in varchar(20),
    IN hiredate_in date,
    -- IN department_in varchar(30),
    IN headship_in varchar(10),
    IN salary_in decimal(8,2)
)
BEGIN
    INSERT INTO employee
    (employee_no,
    employee_name,
    sex,
    birthday,
    address,
    telephone,
    hiredate,
    department,
    headship,
    salary)
    VALUES
    (employee_no_in,
    employee_name_in,
    sex_in,
    birthday_in,
    address_in,
    telephone_in,
    hiredate_in,
    '業務部',
    headship_in,
    salary_in);
END // 

DELIMITER ;

CALL insert_business_employee(
    '2222',
    '無極',
    'F',
    '2001-10-22',
    '北海道',
    '1231232',
    '2001-10-22',
    '老板',
    '1333232'
);

 

2、利用存儲過程輸出所有客戶姓名、客戶訂購金額及其相應業務員的姓名。

DROP PROCEDURE IF EXISTS print_transaction;
DELIMITER //
CREATE PROCEDURE print_transaction()
BEGIN    
    SELECT 
     customer_name, 
     order_sum, 
     employee_name
    FROM 
     customer x 
     LEFT JOIN order_master y ON x.customer_no = y.customer_no
     LEFT JOIN employee z ON y.saler_no = z.employee_no;
END // 
DELIMITER ;
CALL print_transaction();

 

3、利用存儲過程查找某員工的員工編號、訂單編號、銷售金額。

DROP PROCEDURE IF EXISTS select_employee_performance;
DELIMITER //
CREATE PROCEDURE select_employee_performance(
    IN employee_name_in varchar(10)
)
BEGIN
    SELECT
     saler_no,
     order_no,
     order_sum
    FROM
     employee
    LEFT JOIN order_master ON employee_no = saler_no
    WHERE
     employee_name = employee_name_in
    ORDER BY 
     saler_no;
END // 
DELIMITER ;
CALL select_employee_performance('張小梅');

 

4、相關

WEB 開發相關筆記 #05# BUG 日志 持續更新

 

5、插入一條學生記錄，判斷學號是否存在。

DROP PROCEDURE IF EXISTS inserStu;
DELIMITER //
CREATE PROCEDURE inserStu(
    IN id_in INT,
    IN name_in VARCHAR(50)
)
BEGIN
    IF EXISTS (SELECT * FROM stu WHERE id = id_in) THEN
     SELECT "學號已存在";
    ELSE
     INSERT INTO stu
     (id,
     name)
     VALUES
     (id_in,
     name_in);
     SELECT "插入成功";    
    END IF;
END // 
DELIMITER ;

-- 測試
-- CALL inserStu(1, 'wang');
-- CALL inserStu(1, 'wang');
-- CALL inserStu(333, 'wang');