Question

我正在尝试为admin创建会话，并且user这两个表都与具有相同外键的登录表相关联 - 但是当我为admin创建了一个“我”时，我收到错误PL/SQL: ORA-02291: integrity constraint (login_fk_user) violated - parent key not found，在我link中的另一个问题中，我没有以最好的方式解释，但得到了一些关于使用（派对 - 角色 - 关系模型）的想法，而这个代码在他的下面更多与已解决的问题link相关

创建表admin和主键

/* table admin*/
create table admin (id_admin number(10) not null, 
                    admin_name varchar(30) not null);
/* primary key */
alter table admin add constraint admin_pk primary key (id_admin);

创建表users和主键

/* table user*/
create table users (id_user number(10) not null, 
                    user_name varchar(30) not null);
/* primary key */
alter table users add constraint user_pk primary key (id_user);

创建表login以及主键和外键

/* table login*/
create table login(id_login number(10) not null, 
                   id_admin_user_login number(10) not null, 
                   email_login varchar(20) not null, 
                   password_login varchar(10) not null);
/* primary key */
alter table login add constraint login_pk primary key (id_login);

/* foreign key reference to admin*/
alter table login add constraint login_fk_admin foreign key (id_admin_user_login) 
reference admin(id_admin);

 /* foreign key reference to user*/
alter table login add constraint login_fk_user foreign key (id_admin_user_login) 
reference users(id_user);

使用表admin/login为管理员创建会话的过程：

PROCEDURE create_admin_session( p_name   IN VARCHAR2,
                                p_email  IN VARCHAR2,
                                p_pass   IN VARCHAR2,
                                p_error  OUT NUMBER,
                                p_msg_error OUT VARCHAR2)
IS
BEGIN
p_error := 0;
INSERT ALL
INTO admin (id_admin, admin_name) VALUES(seq_admin.NEXTVAL, p_name)

INTO login(id_login, id_admin_user_login, email_login, pass_login)
VALUES(seq_login.NEXTVAL, seq_admin.CURRVAL, p_email, p_pass)

SELECT * FROM DUAL;
COMMIT;
EXCEPTION
WHEN OTHERS THEN
p_error     := 1;
p_msg_error := 'Error!'||SQLERRM;
END create_admin_session;

为具有表users/login的用户创建会话的过程：

PROCEDURE create_user_session( p_name   IN VARCHAR2,
                               p_email  IN VARCHAR2,
                               p_pass   IN VARCHAR2,
                               p_error  OUT NUMBER,
                               p_msg_error OUT VARCHAR2)
IS
BEGIN
p_error := 0;
INSERT ALL
INTO users (id_user, user_name) VALUES(seq_user.NEXTVAL, p_name)

INTO login(id_login, id_admin_user_login, email_login, pass_login)
VALUES(seq_login.NEXTVAL, seq_user.CURRVAL, p_email, p_pass)

SELECT * FROM DUAL;
COMMIT;
EXCEPTION
WHEN OTHERS THEN
p_error     := 1;
p_msg_error := 'Error!'||SQLERRM;
END create_user_session;

当我创建管理会话时，收到错误ORA-02291: integrity constraint (login_fk_user) violated - parent key not found

我做错了什么？

Answer 1

在表格登录中，我为用户id not null添加了两个id_user_login number(10) null，为管理员id_admin_login number(10) null添加了第二个

/* table login*/
create table login(id_login number(10) not null, 
                   id_admin_login number(10) null, 
                   id_user_login number(10) null, 
                   email_login varchar(20) not null, 
                   password_login varchar(10) not null);
/* primary key */
alter table login add constraint login_pk primary key (id_login);

/* foreign key reference to admin*/
alter table login add constraint login_fk_admin foreign key (id_admin_login) 
reference admin(id_admin) ON DELETE CASCADE;

 /* foreign key reference to user*/
alter table login add constraint login_fk_user foreign key (id_user_login) 
reference users(id_user) ON DELETE CASCADE;

使用表admin/login为管理员创建会话的过程：

PROCEDURE create_admin_session( p_name   IN VARCHAR2,
                                p_email  IN VARCHAR2,
                                p_pass   IN VARCHAR2,
                                p_error  OUT NUMBER,
                                p_msg_error OUT VARCHAR2)
IS
BEGIN
p_error := 0;
INSERT ALL
INTO admin (id_admin, admin_name) VALUES(seq_admin.NEXTVAL, p_name)

INTO login(id_login, id_admin_login, id_user_login, email_login, pass_login)
VALUES(seq_login.NEXTVAL, seq_admin.CURRVAL, NULL, p_email, p_pass)

SELECT * FROM DUAL;
COMMIT;
EXCEPTION
WHEN OTHERS THEN
p_error     := 1;
p_msg_error := 'Error!'||SQLERRM;
END create_admin_session;

为具有表users/login的用户创建会话的过程：

PROCEDURE create_user_session( p_name   IN VARCHAR2,
                               p_email  IN VARCHAR2,
                               p_pass   IN VARCHAR2,
                               p_error  OUT NUMBER,
                               p_msg_error OUT VARCHAR2)
IS
BEGIN
p_error := 0;
INSERT ALL
INTO users (id_user, user_name) VALUES(seq_user.NEXTVAL, p_name)

INTO login(id_login, id_admin_login, id_user_login, email_login, pass_login)
VALUES(seq_login.NEXTVAL, NULL, seq_user.CURRVAL, p_email, p_pass)

SELECT * FROM DUAL;
COMMIT;
EXCEPTION
WHEN OTHERS THEN
p_error     := 1;
p_msg_error := 'Error!'||SQLERRM;
END create_user_session;

通过这个决议，一切都在完美，如果我需要drop user/login就像我想要的那样工作

ORA-02291：违反了完整性约束（） - 未找到父键

1 个答案: