参考b站：视频连接

1、数据库设计

使用sqlite3，新建一个book的表，并且都让主键自增

Nmae	Value
bookid	书本标签
name	书名
count	数量
press	价格
type	类别
pic	书本封面图片

书的借阅记录表

Nmae	Value
bookid	书本标签
id	序号
userid	用户id
start	开始时间
end	结束时间
record	借阅记录

用户表

Nmae	Value
userid	用户id
username	用户名
auth	结束时间
department	借阅记录
password	密码
nickname	姓名

将record表的bookid和userid和另外两个表关联起来，设置外键关联可以避免一些前置的错误

2、数据库增删改查

2.1 book表操作

#插入书籍
insert into book VALUES(NULL,'精品美','19.9','历史','人文','','100','');
insert into book VALUES(NULL,'三国演义','30','历史','人文','','50','');
insert into book VALUES(NULL,'西游记','20','神话','人文','','50','');
#查询所有书籍
select * from book
#删除书籍
DELETE from book WHERE bookid=2
#修改书籍价格
update book set press = '300'where bookid = 2;
#清空库，并且让主键从1自增
DELETE from book;
DELETE FROM sqlite_sequence WHERE name = 'book';

2.2 user表操作

#插入
insert into user VALUES(NULL,'小强','1年级1班','学生','计算机系','xiaoqiang','123456');
insert into user VALUES(NULL,'小张','1年级1班','学生','计算机系','xiaozhang','123456');
insert into user VALUES(NULL,'小明','1年级1班','学生','计算机系','xiaoming','123456');

2.3 record表的操作（重点）

#record增加,设置好的外键要存在才能添加进入
insert into record VALUES(NULL,1,2,'2024年2月21日10:00:14','2024年2月23日10:00:14');
#record删除
DELETE from record；
#删除用户，需要先把记录删了，因为外键的存在，要先归还
DELETE from user where userid = 2;
#删除书籍同理#通过记录查询人和书籍，多表联查
SELECT * from record join book using(bookid);
SELECT * from record join user using(userid);

设置的外键阻止删除

多表联查

3、数据表导出

/*
` Navicat Premium Data Transfer
` Source Server         : book
` Source Server Type    : SQLite
` Source Server Version : 3035005 (3.35.5)
` Source Schema         : main
` Target Server Type    : SQLite
` Target Server Version : 3035005 (3.35.5)
` File Encoding         : 65001
` Date: 21/02/2024 10:42:57
*/
PRAGMA foreign_keys = false;
-- ----------------------------
-- Table structure for book
-- ----------------------------
DROP TABLE IF EXISTS "book";
CREATE TABLE "book" (`  "bookid" integer NOT NULL PRIMARY KEY AUTOINCREMENT,`  "name" text,`  "press" integer,`  "type1" TEXT,`  "type2" TEXT,`  "type3" TEXT,`  "count" integer,`  "  pic" TEXT
);
-- ----------------------------
-- Records of book
-- ----------------------------
INSERT INTO "book" VALUES (1, '精品美', 19.9, '历史', '人文', '', 100, '');
INSERT INTO "book" VALUES (2, '精品美', 300, '历史', '人文', '', 100, '');
INSERT INTO "book" VALUES (3, '三国演义', 30, '历史', '人文', '', 50, '');
INSERT INTO "book" VALUES (4, '西游记', 20, '神话', '人文', '', 50, '');
-- ----------------------------
-- Table structure for record
-- ----------------------------
DROP TABLE IF EXISTS "record";
CREATE TABLE "record" (`  "bookid" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,`  "id" INTEGER,`  "userid" INTEGER,`  "start" TEXT,`  "end" TEXT,`  "record" TEXT,`  FOREIGN KEY ("bookid") REFERENCES "book" ("bookid") ON DELETE NO ACTION ON UPDATE NO ACTION,`  FOREIGN KEY ("userid") REFERENCES "user" ("userid") ON DELETE NO ACTION ON UPDATE NO ACTION
);
-- ----------------------------
-- Records of record
-- ----------------------------
-- ----------------------------
-- Table structure for sqlite_sequence
-- ----------------------------
DROP TABLE IF EXISTS "sqlite_sequence";
CREATE TABLE "sqlite_sequence" (`  "name",`  "seq"
);
-- ----------------------------
-- Records of sqlite_sequence
-- ----------------------------
INSERT INTO "sqlite_sequence" VALUES ('book', 4);
INSERT INTO "sqlite_sequence" VALUES ('record', 0);
INSERT INTO "sqlite_sequence" VALUES ('book', 4);
-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS "user";
CREATE TABLE "user" (`  "userid" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,`  "username" TEXT,`  "auth" TEXT,`  "department" TEXT,`  "password" TEXT,`  "nickname" TEXT
);
-- ----------------------------
-- Records of user
-- ----------------------------
-- ----------------------------
-- Auto increment value for book
-- ----------------------------
UPDATE "sqlite_sequence" SET seq = 4 WHERE name = 'book';
-- ----------------------------
-- Auto increment value for record
-- ----------------------------
PRAGMA foreign_keys = true;