Question

我正在研究C＃项目，我正在使用system.data.sqlite。我有用

创建的3个（相关）表

create table students(
    _id integer primary key,
    fname text not null,
    lname text not null,
    st_number integer not null unique,
    level integer not null,
    class integer,
FOREIGN KEY (class) REFERENCES classes(_id) on delete cascade on update cascade,
FOREIGN KEY (level) REFERENCES levels(_id) on delete cascade on update cascade)

create table payments(
    _id integer primary key,
    student integer not null,
    amount integer not null,
    recieve_date text not null,
    type text not null,
foreign key(student) references students(st_number) on update cascade on delete cascade)

create table signups(
    _id integer primary key,
    student integer not null,
    service integer not null,
foreign key(student) references students(st_number) on update cascade on delete cascade,
foreign key(service) references services(_id) on update cascade on delete cascade)

现在，当我尝试从学生表中删除记录时，我收到FK违规错误，而我希望它从付款和注册表中删除所有连接的条目。

它可能与我在sqlite中打开FK支持的方式有关。我在我的连接字符串中打开它

@"Data Source=" + dbPath + ";Version=3;foreign_keys = 1;"

很抱歉有很长的创建语句。任何帮助非常感谢。

Answer 1

@"Data Source=" + dbPath + ";Version=3;foreign_keys = 1;"

看起来是一个错字，应该改为：

@"Data Source=" + dbPath + ";Version=3;foreign keys = 1;"

我将_更改为空格。

Answer 2

原来另一张表是指付款而其FK没有级联。补充说，一切正常。

即使指定了ON DELETE CASCADE，DELETE也会因“外键约束失败”而失败

2 个答案: