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我想使用On Cascade Delete.当我从父表Delete from customers where customer_Id=3删除记录时，子记录仍然存在，我无法弄清楚我失踪了什么。我的代码应该如何查找这个工作？使用级联删除
CREATE TABLE IF NOT EXISTS customers /* Parent table */
(
customer_Id INT NOT NULL AUTO_INCREMENT,
firstName VARCHAR(30),
lastName VARCHAR(30),
userName VARCHAR(30),
password VARCHAR(30),
PRIMARY KEY(customer_Id),
UNIQUE KEY(userName)
)ENGINE=InnoDB;
CREATE TABLE IF NOT EXISTS orders /* Child table */
(
item_Id INT NOT NULL AUTO_INCREMENT,
item_cost DOUBLE,
item_name VARCHAR(30),
customer_Id INT NOT NULL,
userName VARCHAR(30),
PRIMARY KEY(item_Id),
CONSTRAINT First_Foreign_Key1
FOREIGN KEY fk_customer_id(customer_Id)
REFERENCES customers(customer_Id)
ON UPDATE CASCADE
on DELETE CASCADE,
CONSTRAINT Second_Foreign_Key2
FOREIGN KEY fk_userName(userName)
REFERENCES customers(userName)
ON UPDATE CASCADE
ON DELETE CASCADE
)ENGINE=InnoDB;