Question

我正在尝试插入我的数据库以“填充”它，并且所有插入工作正常，除了“预留”插入...
当我尝试插入我的预订表时：

Insert Into Reservation
(ReservNum, ReserveDate, NumOfPassengers, sheduledTime, ActualPickupTime, ActualTime, PricePaid, HourlyRate, SalaryEarned)
VALUES
('24333', '2015-10-15', '6', '20', '7:04', '22', '$15', '34', '$12.47');

我收到此错误：

无法添加或更新子行：外键约束失败（`oma``Reservation`，CONSTRAINT`Reservation_ibfk_1` FOREIGN KEY（`Customer_CustomerID`）REFERENCES`Customer`（`CustomerID`））

以下是我的创建表：

CREATE TABLE Customer (
CustomerID INT AUTO_INCREMENT,
Name VARCHAR(90) NOT NULL,
Phone VARCHAR(45) NULL,
PRIMARY KEY (CustomerID));

CREATE TABLE Location (
Address VARCHAR(100) NOT NULL,
Latitude VARCHAR(45) NOT NULL DEFAULT ' ',
Longitude VARCHAR(45) NOT NULL,
PRIMARY KEY (Address));


CREATE TABLE Employee (
EmployeeID INT AUTO_INCREMENT,
Name VARCHAR(90) NOT NULL,
PRIMARY KEY (EmployeeID));


CREATE TABLE Truck (
LicensePlate CHAR(20) NOT NULL,
color VARCHAR(45) NULL,
capacity VARCHAR(45) NULL,
PRIMARY KEY (LicensePlate));

CREATE TABLE Shifts (
ShiftTime DATETIME NOT NULL,
PRIMARY KEY (ShiftTime));

CREATE TABLE EmployeeShifts (
DesiredShift DATETIME NOT NULL,
EmployeeWorking INT NULL,
DateOfShift DATE,
PRIMARY KEY(DesiredShift, EmployeeWorking),
FOREIGN KEY (EmployeeWorking) REFERENCES Employee(EmployeeID),
FOREIGN KEY (DesiredShift) REFERENCES Shifts(ShiftTime));

CREATE TABLE Reservation (
ReservNum INT NOT NULL,
ReserveDate DATE NULL,
PickupTime VARCHAR(45) NOT NULL,
NumOfPassengers INT NULL,
sheduledTime VARCHAR(45) NULL,
ActualPickupTime VARCHAR(45),
ActualTime VARCHAR(45),
SalaryEarned VARCHAR(10),
PricePaid VARCHAR(45),
HourlyRate DECIMAL(7,2) NOT NULL,
Customer_CustomerID INT AUTO_INCREMENT,
Truck_LicensePlate char(20) NOT NULL,
Employee_EmployeeID_Driver INT,
Location_Address_Pickup VARCHAR(100),
Employee_EmployeeID_Passenger INT,
Location_Address_Drop VARCHAR(100),
PRIMARY KEY (ReservNum),
FOREIGN KEY (Customer_CustomerID) REFERENCES Customer (CustomerID),
FOREIGN KEY (Truck_LicensePlate) REFERENCES Truck (LicensePlate),
FOREIGN KEY (Employee_EmployeeID_Driver) REFERENCES Employee (EmployeeID),
FOREIGN KEY (Location_Address_Pickup) REFERENCES Location (Address),
FOREIGN KEY (Employee_EmployeeID_Passenger) REFERENCES Employee (EmployeeID),
FOREIGN KEY (Location_Address_Drop) REFERENCES Location (Address));

Answer 1

Customer_Customer_ID中的Reservation列是AUTO INCREMENT：

Customer_CustomerID INT AUTO_INCREMENT,

意味着如果您在INSERT时没有指定值，则会自动为其分配一个值。您没有在INSERT中指定它，因此自动分配给它的值在Customers表中不存在，这违反了FOREIGN KEY约束：

FOREIGN KEY (Customer_CustomerID) REFERENCES Customer (CustomerID),

要解决这个问题，

从AUTO_INCREMENT列中删除Customer_CustomerID。您现在应该能够插入，因为该列可以是NULL，在这种情况下，FOREIGN KEY不是问题。

或者，如果您要将客户分配到预订，请确保Customer表中存在一行，并将Customer_Id传递给INSERT INTO Reservation。例如，像这样：

INSERT INTO Customers( Name ) VALUES ('Test');

INSERT INTO Reservation (
    ReservNum, Customer_Customer_ID,
    ReserveDate, NumOfPassengers, 
    sheduledTime, ActualPickupTime, ActualTime,
    PricePaid, HourlyRate, SalaryEarned
)
VALUES (
    '24333', LAST_INSERT_ID(),
    '2015-10-15', '6',
    '20', '7:04', '22',
    '$15', '34', '$12.47'
);

LAST_INSERT_ID()获取上一个AUTO_INCREMENT中INSERT列的值。

我收到此错误：无法添加或更新子行：外键约束失败

1 个答案: