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day04_JDBC_课后练习 - 参考答案(一共11道练习题)
作者：凡人多烦事01 | 2024-04-17 17:59:00
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day04_JDBC_课后练习 - 参考答案(一共11道练习题)
day04_JDBC_课后练习
第1题
案例：
1、创建数据库day04_test01_bookstore
2、创建如下表格
（1）图书表books
（2）用户表users
（3）订单表orders
（4）订单明细表order_items
3、使用sql语句在命令行或SQLyog中添加一些模拟数据
表books：
表users：
表orders：
表order_items：
4、使用JDBC实现往用户表中添加1个用户，注意密码存储使用mysql的password()函数进行加密
5、使用JDBC实现往图书表中添加1本图书
6、从键盘输入用户名和密码，模拟登录，使用JDBC实现验证用户名和密码是否正确，如果正确，显示登录成功，否则显示用户名或密码错误
7、使用JDBC实现查询所有图书信息
8、使用JDBC实现查询销量最大的图书信息
9、使用JDBC实现修改库存量小于10本的图书的库存量为100
10、从键盘输入用户名，实现查询该用户的订单和订单明细
11、使用JDBC实现删除订单“15275760194821”的相关信息，注意涉及到两张表
参考答案
第1题-第3题的sql
#创建数据库
CREATE DATABASE `day04_test01_bookstore` CHARACTER SET utf8;
USE `day04_test01_bookstore`;
#创建表
CREATE TABLE `books` (
`id` INT(11) PRIMARY KEY NOT NULL AUTO_INCREMENT,
`title` VARCHAR(100) NOT NULL,
`author` VARCHAR(100) NOT NULL,
`price` DOUBLE(11,2) NOT NULL,
`sales` INT(11) NOT NULL,
`stock` INT(11) NOT NULL,
`img_path` VARCHAR(100) NOT NULL
) ENGINE=INNODB AUTO_INCREMENT=31 DEFAULT CHARSET=utf8;
/*Data for the table `books` */
INSERT INTO `books`(`id`,`title`,`author`,`price`,`sales`,`stock`,`img_path`) VALUES
(1,'解忧杂货店','东野圭吾',27.20,102,98,'upload/books/解忧杂货店.jpg'),
(2,'边城','沈从文',23.00,102,98,'upload/books/边城.jpg'),
(3,'中国哲学史','冯友兰',44.50,101,99,'upload/books/中国哲学史.jpg'),
(4,'忽然七日',' 劳伦',19.33,101,99,'upload/books/忽然七日.jpg'),
(5,'苏东坡传','林语堂',19.30,100,100,'upload/books/苏东坡传.jpg'),
(6,'百年孤独','马尔克斯',29.50,100,100,'upload/books/百年孤独.jpg'),
(7,'扶桑','严歌苓',19.80,100,100,'upload/books/扶桑.jpg'),
(8,'给孩子的诗','北岛',22.20,100,100,'upload/books/给孩子的诗.jpg'),
(9,'为奴十二年','所罗门',16.50,100,100,'upload/books/为奴十二年.jpg'),
(10,'平凡的世界','路遥',55.00,100,100,'upload/books/平凡的世界.jpg'),
(11,'悟空传','今何在',14.00,100,100,'upload/books/悟空传.jpg'),
(12,'硬派健身','斌卡',31.20,100,100,'upload/books/硬派健身.jpg'),
(13,'从晚清到民国','唐德刚',39.90,100,100,'upload/books/从晚清到民国.jpg'),
(14,'三体','刘慈欣',56.50,100,100,'upload/books/三体.jpg'),
(15,'看见','柴静',19.50,100,100,'upload/books/看见.jpg'),
(16,'活着','余华',11.00,100,100,'upload/books/活着.jpg'),
(17,'小王子','安托万',19.20,100,100,'upload/books/小王子.jpg'),
(18,'我们仨','杨绛',11.30,100,100,'upload/books/我们仨.jpg'),
(19,'生命不息,折腾不止','罗永浩',25.20,100,100,'upload/books/生命不息.jpg'),
(20,'皮囊','蔡崇达',23.90,100,100,'upload/books/皮囊.jpg'),
(21,'恰到好处的幸福','毕淑敏',16.40,100,100,'upload/books/恰到好处的幸福.jpg'),
(22,'大数据预测','埃里克',37.20,100,100,'upload/books/大数据预测.jpg'),
(23,'人月神话','布鲁克斯',55.90,100,100,'upload/books/人月神话.jpg'),
(24,'C语言入门经典','霍尔顿',45.00,100,100,'upload/books/C语言入门经典.jpg'),
(25,'数学之美','吴军',29.90,100,100,'upload/books/数学之美.jpg'),
(26,'Java编程思想','埃史尔',70.50,100,100,'upload/books/Java编程思想.jpg'),
(27,'设计模式之禅','秦小波',20.20,100,100,'upload/books/设计模式之禅.jpg'),
(28,'图解机器学习','杉山将',33.80,100,100,'upload/books/图解机器学习.jpg'),
(29,'艾伦图灵传','安德鲁',47.20,100,100,'upload/books/艾伦图灵传.jpg'),
(30,'教父','马里奥普佐',29.00,100,100,'upload/books/教父.jpg');
CREATE TABLE `users` (
`id` INT(11) PRIMARY KEY NOT NULL AUTO_INCREMENT,
`username` VARCHAR(100) UNIQUE KEY NOT NULL,
`password` VARCHAR(100) NOT NULL,
`email` VARCHAR(100) DEFAULT NULL
) ENGINE=INNODB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8;
/*Data for the table `users` */
INSERT INTO `users`(`id`,`username`,`password`,`email`) VALUES
(1,'admin',PASSWORD('123456'),'admin@atguigu.com'),
(2,'admin2',PASSWORD('123456'),'admin2@atguigu.com'),
(3,'admin3',PASSWORD('123456'),'admin3@atguigu.com'),
(4,'chai',PASSWORD('123'),'chai@atguigu.com');
CREATE TABLE `orders` (
`id` VARCHAR(100) PRIMARY KEY NOT NULL,
`order_time` DATETIME NOT NULL,
`total_count` INT(11) NOT NULL,
`total_amount` DOUBLE(11,2) NOT NULL,
`state` INT(11) NOT NULL,
`user_id` INT(11) NOT NULL,
CONSTRAINT `orders_users_id_fk` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`)
) ENGINE=INNODB DEFAULT CHARSET=utf8;
/*Data for the table `orders` */
INSERT INTO `orders`(`id`,`order_time`,`total_count`,`total_amount`,`state`,`user_id`) VALUES
('15275760194821','2018-05-29 14:40:19',4,114.03,2,1),
('15294258455691','2018-06-20 00:30:45',2,50.20,0,1);
CREATE TABLE `order_items` (
`id` INT(11) PRIMARY KEY NOT NULL AUTO_INCREMENT,
`count` INT(11) NOT NULL,
`amount` DOUBLE(11,2) NOT NULL,
`title` VARCHAR(100) NOT NULL,
`author` VARCHAR(100) NOT NULL,
`price` DOUBLE(11,2) NOT NULL,
`img_path` VARCHAR(100) NOT NULL,
`order_id` VARCHAR(100) NOT NULL,
CONSTRAINT `order_items_orders_id_fk` FOREIGN KEY (`order_id`) REFERENCES `orders` (`id`) ON DELETE CASCADE
) ENGINE=INNODB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;
/*Data for the table `order_items` */
INSERT INTO `order_items`
(`id`,`count`,`amount`,`title`,`author`,`price`,`img_path`,`order_id`) VALUES
(1,1,27.20,'解忧杂货店','东野圭吾',27.20,'static/img/default.jpg','15275760194821'),
(2,1,23.00,'边城','沈从文',23.00,'static/img/default.jpg','15275760194821'),
(3,1,44.50,'中国哲学史','冯友兰',44.50,'static/img/default.jpg','15275760194821'),
(4,1,19.33,'忽然七日',' 劳伦',19.33,'static/img/default.jpg','15275760194821'),
(5,1,27.20,'解忧杂货店','东野圭吾',27.20,'static/img/default.jpg','15294258455691'),
(6,1,23.00,'边城','沈从文',23.00,'static/img/default.jpg','15294258455691');
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第4题
package com.atguigu.jdbc;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.util.Scanner;
import org.junit.Test;
public class Test04 {
@Test
public void test()throws Exception{
//从键盘输入用户信息，添加到day04_test01_bookstore库的users表中
Scanner input = new Scanner(System.in);
System.out.print("请输入用户名：");
String username = input.next();
System.out.print("请输入密码：");
String password = input.next();
System.out.print("请输入邮箱：");
String email = input.next();
//1、注册驱动
Class.forName("com.mysql.jdbc.Driver");
//2、获取连接
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/day04_test01_bookstore", "root", "1234");
//3、编写sql
String sql = "insert into users values(null,?,password(?),?)";
//4、创建PreparedStatement
PreparedStatement pst = conn.prepareStatement(sql);//此时的sql带?的
//加入一步，设置?的值
pst.setString(1, username);//1表示第1个?
pst.setString(2, password);//2表示第2个?
pst.setString(3, email);//3表示第3个?
//5、执行sql
int len = pst.executeUpdate();
System.out.println(len>0?"添加成功":"添加失败");
//6、关闭
pst.close();
conn.close();
input.close();
}
}
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第5题
package com.atguigu.jdbc;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import org.junit.Test;
public class Test05 {
@Test
public void test()throws Exception{
//1、注册驱动
Class.forName("com.mysql.jdbc.Driver");
//2、获取连接
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/day04_test01_bookstore", "root", "1234");
//3、编写sql
String sql = "insert into books(`id`,`title`,`author`,`price`,`sales`,`stock`,`img_path`) values(null,?,?,?,?,?,?)";
//4、创建PreparedStatement
PreparedStatement pst = conn.prepareStatement(sql);//此时的sql带?的
//加入一步，设置?的值
pst.setString(1, "《从入门到放弃》");//1表示第1个?
pst.setString(2, "柴林燕");//2表示第2个?
pst.setDouble(3, 88.8);//3表示第3个?
pst.setInt(4, 0);
pst.setInt(5, 100);
pst.setString(6, "upload/books/从入门到放弃.jpg");
//5、执行sql
int len = pst.executeUpdate();
System.out.println(len>0?"添加成功":"添加失败");
//6、关闭
pst.close();
conn.close();
}
}
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第6题
package com.atguigu.jdbc;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Scanner;
public class Test06 {
public static void main(String[] args)throws Exception {
//从键盘输入用户名和密码，模拟登录
Scanner input = new Scanner(System.in);
System.out.println("请登录");
System.out.print("请输入用户名：");
String username = input.next();
System.out.print("请输入密码：");
String password = input.next();
//1、注册驱动
Class.forName("com.mysql.jdbc.Driver");
//2、获取连接
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/day04_test01_bookstore", "root", "1234");
//3、编写sql
String sql = "select * from users where username = ? and password = password(?)";
//4、创建PreparedStatement
PreparedStatement pst = conn.prepareStatement(sql);//此时的sql带?的
//加入一步，设置?的值
pst.setString(1, username);//1表示第1个?
pst.setString(2, password);//2表示第2个?
//5、执行sql
ResultSet rs = pst.executeQuery();
if(rs.next()){
System.out.println("登录成功");
}else{
System.out.println("登录失败，用户名或密码错误");
}
//6、关闭
rs.close();
pst.close();
conn.close();
input.close();
}
}
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第7题
package com.atguigu.jdbc;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
public class Test07 {
public static void main(String[] args)throws Exception {
//1、注册驱动
Class.forName("com.mysql.jdbc.Driver");
//2、获取连接
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/day04_test01_bookstore", "root", "1234");
//3、编写sql
String sql = "select `id`,`title`,`author`,`price`,`sales`,`stock`,`img_path` from books";
//4、创建PreparedStatement
PreparedStatement pst = conn.prepareStatement(sql);//此时的sql带?的
//5、执行sql
ResultSet rs = pst.executeQuery();
while(rs.next()){
for (int i = 1; i <= 7; i++) {
System.out.print(rs.getObject(i)+"\t");
}
System.out.println();
}
//6、关闭
rs.close();
pst.close();
conn.close();
}
}
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第8题
package com.atguigu.jdbc;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
public class Test08 {
public static void main(String[] args)throws Exception {
//1、注册驱动
Class.forName("com.mysql.jdbc.Driver");
//2、获取连接
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/day04_test01_bookstore", "root", "1234");
//3、编写sql
String sql = "select `id`,`title`,`author`,`price`,`sales`,`stock`,`img_path` from books where sales = (select max(sales) from books)";
//4、创建PreparedStatement
PreparedStatement pst = conn.prepareStatement(sql);//此时的sql带?的
//5、执行sql
ResultSet rs = pst.executeQuery();
while(rs.next()){
for (int i = 1; i <= 7; i++) {
System.out.print(rs.getObject(i)+"\t");
}
System.out.println();
}
//6、关闭
rs.close();
pst.close();
conn.close();
}
}
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第9题
package com.atguigu.jdbc;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
public class Test09 {
public static void main(String[] args)throws Exception {
//1、注册驱动
Class.forName("com.mysql.jdbc.Driver");
//2、获取连接
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/day04_test01_bookstore", "root", "1234");
//3、编写sql
String sql = "update books set `stock` = 100 where stock < 10";
//4、创建PreparedStatement
PreparedStatement pst = conn.prepareStatement(sql);//此时的sql带?的
//5、执行sql
int len = pst.executeUpdate();
System.out.println(len>=0 ? "修改成功" : "修改失败");
//6、关闭
pst.close();
conn.close();
}
}
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第10题
package com.atguigu.jdbc;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Scanner;
public class Test10 {
public static void main(String[] args)throws Exception {
Scanner input = new Scanner(System.in);
System.out.print("请输入用户名：");
String username = input.next();
//1、注册驱动
Class.forName("com.mysql.jdbc.Driver");
//2、获取连接
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/day04_test01_bookstore", "root", "1234");
//3、编写sql
String sql = "SELECT * FROM order_items INNER JOIN orders ON order_items.order_id = orders.id WHERE user_id = (SELECT id FROM users WHERE username = ?)";
//4、创建PreparedStatement
PreparedStatement pst = conn.prepareStatement(sql);//此时的sql带?的
pst.setString(1, username);
//5、执行sql
ResultSet rs = pst.executeQuery();
while(rs.next()){
for (int i = 1; i <= 14; i++) {
System.out.print(rs.getObject(i)+"\t");
}
System.out.println();
}
//6、关闭
rs.close();
pst.close();
conn.close();
input.close();
}
}
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第11题
因为定义表结构时，设置了级联删除，因此删除主表，从表对应记录会自动删除
- 1
package com.atguigu.jdbc;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
public class Test11 {
public static void main(String[] args)throws Exception {
//1、注册驱动
Class.forName("com.mysql.jdbc.Driver");
//2、获取连接
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/day04_test01_bookstore", "root", "1234");
//3、编写sql
String sql = "DELETE FROM orders WHERE id = '15275760194821'";
//4、创建PreparedStatement
PreparedStatement pst = conn.prepareStatement(sql);//此时的sql带?的
//5、执行sql
int len = pst.executeUpdate();
System.out.println(len>=0 ? "删除成功" : "删除失败");
//6、关闭
pst.close();
conn.close();
}
}
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