在 MariaDB 中遇到过程问题

Question

我正在使用 MariaDB 创建一个基本的机场管理系统 SQL 数据库。我想创建一个包含事务的过程，以确保：每当乘客被转移到另一个航班时，与该乘客相关（属于）的行李将被转移到同一航班。我不断收到错误代码：

错误代码：1054。'field list'

中的未知列 'Flight_ID'

哪里出错了？这是我的程序代码以及数据库中的相关表：

Code for the procedure

Tables referenced

程序：

DELIMITER //
CREATE PROCEDURE PassengerTransfer (
    IN vPassportNo VARCHAR(9), vOldFlightID VARCHAR(4), vNewFlightID VARCHAR(4), OUT vStatus VARCHAR(45))
BEGIN
    START TRANSACTION;
    SET SQL_SAFE_UPDATES = 0;
    UPDATE TRAVELS
    SET Flight_ID = vNewFlightID
    WHERE Flight_ID = vOldFlightID AND Passport_no = vPassportNo;

    UPDATE CARRIES INNER JOIN LUGGAGE ON LUGGAGE.LuggageID = CARRIES.LuggageID
    SET CARRRIES.Flight_ID = vNewFlightID
    WHERE LUGGAGE.Passport_no = vPassportNo;

    IF (TRAVELS.Flight_ID = vNewFlightID AND TRAVELS.Passport_no = vPassportNo)
    AND (CARRIES.Flight_ID = vNewFlightID AND LUGGAGE.LuggageID = CARRIES.LuggageID
    AND LUGGAGE.Passport_no = vPassportNo)
        THEN SET vStatus = "Trasaction PassengerTransfer committed!"; COMMIT;
        ELSE SET vStatus = "Transaction PassengerTransfer rollback"; ROLLBACK;
    END IF;
END; //
DELIMITER ;

引用的表格：

CREATE TABLE Travels(
Passport_no varchar(9) not null,
Flight_ID varchar(4) not null,
PRIMARY KEY (Passport_no),
FOREIGN KEY (Flight_ID) REFERENCES Flight(Flight_ID) ON UPDATE CASCADE,  
FOREIGN KEY (Passport_no) REFERENCES Passenger(Passport_no) ON DELETE CASCADE ON UPDATE CASCADE
);

CREATE TABLE Luggage(
LuggageID       varchar(5) not null,
Weight          decimal(4,2),                   
Passport_no     varchar(9) not null, 
PRIMARY KEY (LuggageID),
FOREIGN KEY(Passport_no) REFERENCES Passenger(Passport_no) ON UPDATE CASCADE
);

CREATE TABLE Carries(
LuggageID       varchar(5) not null,
Flight_ID   varchar(4) not null,
PRIMARY KEY (LuggageID)
);

Answer 1

NEW 和 OLD 关键字仅在触发器中可用，在过程中不可用。所以像这样的代码：

UPDATE TRAVELS SET NEW.Flight_ID = vNewFlightID
WHERE OLD.Flight_ID = vOldFlightID AND Passport_no = vPassportNo;

应该写成：

UPDATE TRAVELS 
SET Flight_ID = vNewFlightID
WHERE Flight_ID = vOldFlightID AND Passport_no = vPassportNo;

您的代码：

UPDATE CARRIES SET NEW.Flight_ID = vNewFlightID
WHERE LUGGAGE.LuggageID = CARRIES.LuggageID AND
LUGGAGE.Passport_no = vPassportNo;

应该写成：

UPDATE CARRIES 
   INNER JOIN LUGGAGE ON LUGGAGE.LuggageID=CARRIES.LuggageID
SET CARRIES.Flight_ID = vNewFlightID
WHERE LUGGAGE.Passport_no = vPassportNo;

在 MariaDB 中遇到过程问题

Having trouble with a procedure in MariaDB

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