MySQL的語法錯誤 - 無法創建表

Question

這裏是我的代碼

CREATE TABLE IF NOT EXISTS items 
( 
id INT NOT NULL AUTO_INCREMENT, 
name varchar(256) , 
description TEXT, 
price INT , 
images TEXT, 
views INT , 
hidden TEXT, 
purchases INT, 
PRIMARY KEY (id) 
); 

CREATE TABLE IF NOT EXISTS methods 
( 
method_id INT NOT NULL AUTO_INCREMENT, 
method varchar(256), 
username varchar(256), 
password varchar(256), 
PRIMARY KEY (method_id) 
); 

CREATE TABLE IF NOT EXISTS payments 
( 
payment_id INT NOT NULL AUTO_INCREMENT, 
item_id INT NOT NULL, 
method varchar(256), 
display INT, 
PRIMARY KEY (payment_id) , 
FOREIGN KEY (item_id) REFERENCES items (id) ON DELETE CASCADE ON UPDATE CASCADE, 
FOREIGN KEY (method) REFERENCES methods (method) ON DELETE CASCADE ON UPDATE CASCADE 
)ENGINE=InnoDB DEFAULT CHARSET=latin1; 

第2個表獲取生成不錯，但第三個「支付」給我的錯誤代碼150！這應該與FK有關？

有幫助嗎？

Answer 1

方法表中的主鍵是method_id而不是method。和數據類型是INT不VARCHAR(256)

您需要：

CREATE TABLE IF NOT EXISTS payments 
( 
    payment_id INT NOT NULL AUTO_INCREMENT, 
    item_id INT NOT NULL, 
    method_id int, -- this is different 
    display INT, 
    PRIMARY KEY (payment_id) , 
    FOREIGN KEY (item_id) REFERENCES items (id) ON DELETE CASCADE ON UPDATE CASCADE, 

    -- and this line is different 
    FOREIGN KEY (method_id) REFERENCES methods (method_id) ON DELETE CASCADE ON UPDATE CASCADE 
) ENGINE=InnoDB DEFAULT CHARSET=latin1;