SQLite3 UNIQUE约束失败错误

Question

我正在尝试创建一个数据库,允许用户创建"待办事项"列表并填写完成的项目.但是,当将数据插入表时,它给我一个UNIQUE约束失败错误,我不知道如何解决它.这是我创建数据库和插入数据的代码.

CREATE TABLE user (
    user_id integer  NOT NULL   PRIMARY KEY,
    first_name varchar(15)  NOT NULL,
    title varchar(5)  NOT NULL,
    username varchar(15)  NOT NULL,
    password varchar(20)  NOT NULL,
    email varchar(50)  NOT NULL,
    bio text  NOT NULL
);


CREATE TABLE list (
    list_id integer  NOT NULL   PRIMARY KEY,
    list_name varchar(10)  NOT NULL,
    user_user_id integer  NOT NULL,
    FOREIGN KEY (user_user_id) REFERENCES user(user_id)
);


CREATE TABLE item (
    item_id integer  NOT NULL   PRIMARY KEY,
    item text  NOT NULL,
    completed boolean  NOT NULL,
    list_list_id integer  NOT NULL,
    FOREIGN KEY (list_list_id) REFERENCES list(list_id)
);


-- Data:
INSERT INTO user VALUES (1, "Name1", "Title1", "Username1", "Password1", "Email1", "Bio1");
INSERT INTO user VALUES (2, "Name2", "Title2", "Username2", "Password2", "Email2", "Bio2");
INSERT INTO user VALUES (3, "Name3", "Title3", "Username3", "Password3", "Email3", "Bio3");

INSERT INTO list VALUES (1, "user1-list1", 1);
INSERT INTO list VALUES (2, "user1-list2", 1);
INSERT INTO list VALUES (3, "user1-list3", 1);
INSERT INTO list VALUES (1, "user2-list1", 2);
INSERT INTO list VALUES (1, "user3-list1", 3);
INSERT INTO list VALUES (2, "user3-list2", 3);

INSERT INTO item VALUES (1, "user1-list1-item1", "FALSE", 1);
INSERT INTO item VALUES (2, "user1-list1-item2", "FALSE", 1);
INSERT INTO item VALUES (1, "user1-list2-item1", "FALSE", 2);
INSERT INTO item VALUES (1, "user1-list3-item1", "FALSE", 3);
INSERT INTO item VALUES (2, "user1-list3-item2", "FALSE", 3);
INSERT INTO item VALUES (1, "user2-list1-item1", "FALSE", 1);
INSERT INTO item VALUES (2, "user2-list1-item1", "FALSE", 1);
INSERT INTO item VALUES (1, "user3-list1-item1", "FALSE", 1);
INSERT INTO item VALUES (1, "user3-list3-item1", "FALSE", 2);

我复制了下面收到的错误:

Error: near line 43: UNIQUE constraint failed: list.list_id
Error: near line 44: UNIQUE constraint failed: list.list_id
Error: near line 45: UNIQUE constraint failed: list.list_id
Error: near line 49: UNIQUE constraint failed: item.item_id
Error: near line 50: UNIQUE constraint failed: item.item_id
Error: near line 51: UNIQUE constraint failed: item.item_id
Error: near line 52: UNIQUE constraint failed: item.item_id
Error: near line 53: UNIQUE constraint failed: item.item_id
Error: near line 54: UNIQUE constraint failed: item.item_id
Error: near line 55: UNIQUE constraint failed: item.item_id

任何帮助,将不胜感激!

Answer 1

UNIQUE constraint failed当您插入的数据的条目已经在您要插入的表的相应列中时,会出现错误.

如果您希望SQL发生IGNORE错误并继续添加其他记录,请执行以下操作:

INSERT or IGNORE into tablename VALUES (value1,value2 , so on );

如果要在条目已存在时替换表中的值,请执行以下操作:

INSERT or REPLACE into tablename VALUES (value1,value2 , so on );

这样可以节省大量的处理工作并且非常有用.

Answer 2

您已将list_id设置为列表表上的主键，这意味着该值对于每个记录都必须是唯一的。因此，尝试插入具有相同list_id表的多个记录会导致错误。

项目表的问题相同。