mysql - MySQL 错误：#1452 - 无法添加或更新子行：外键约束失败

Question

我能够成功地在业务表中插入一行，但不能在business_contact表中插入一行。每当我尝试在business_contact表中插入一行时，都会出现以下错误：

#1452 - 无法添加或更新子行：外键约束失败

尽管我尝试插入到business_contact表中的行具有业务表中已经存在的BusinessID。

business_contact插入语句失败

INSERT INTO business_contact(BusinessID, BusinessContactTypeID, BusinessContactData) VALUES (1, 1, '0097336031000');

Answer 1

business您应该在您的和表中检查以下内容contact_type_lookup： 1.business表具有BusinessID您尝试插入到business_contact 2.contact_type_lookup table hasContactTypeID的值value that you are trying to insert into business_contact

此错误与 missingBusinessID和 or missing相关ContactTypeID。要验证这一点，请从表和表中选择BusinessID记录。 businessContactTypeIDcontact_type_lookup

例如：如果您正在执行以下查询：

insert into business_contact(BusinessContactID, BusinessID, BusinessContactTypeID, BusinessContactData) values ('1', '2', '3', 'This is the business contact data');

然后，确保以下查询返回有效结果：

select BusinessID from business where BusinessID = 2;

select ContactTypeID from business_contact_type where ContactTypeID = 3;