本文主要是介绍Java学习Day34：图书管理小项目，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
搭建过程
1.根据需求设计数据库
- 概念设计：使用ER图等工具设计数据库概念模型，明确实体、属性、关系。
- 逻辑设计：将概念模型转换为数据库表结构，确定主键、外键、索引等。
- 物理设计：根据数据库管理系统的特性进行物理存储设计，如文件组织、存储分配等（通常由数据库管理系统自动处理）。
- 编写SQL脚本：创建数据库、表、视图、存储过程等。
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2.后端导入德鲁伊的proprities文件
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3.书写德鲁伊工具类简化后去datasouse
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public class druidUtils {private static DataSource dataSource;static {Properties properties =new Properties();try {properties.load(druidUtils.class.getClassLoader().getResourceAsStream("JDBC_durid/druid.properties"));dataSource= DruidDataSourceFactory.createDataSource(properties);} catch (IOException e) {throw new RuntimeException(e);} catch (Exception e) {throw new RuntimeException(e);}}private druidUtils(){}//私有构造，防止外部实例化此类public static Connection getConnection() throws SQLException {//获取链接模块return dataSource.getConnection();}public static void close(Connection con, PreparedStatement pst){if (con!=null){try {con.close();} catch (SQLException e) {throw new RuntimeException(e);}}if (pst!=null){try {pst.close();} catch (SQLException e) {throw new RuntimeException(e);}}}public static DataSource getDataSource(){return dataSource;}public static void close(Connection con, PreparedStatement pst, ResultSet rst) {close(con,pst);if (rst!=null){try {rst.close();} catch (SQLException e) {throw new RuntimeException(e);}}}
}
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4.BaseDao接口设计
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package JDBC_durid;import java.util.List;public interface bookBaseDao {public int select();//显示图书public int update(book b);//更新操作public int add(book b);//新增public int deleat();//删除public List<book> selectname();public int brow();//借书public int huan();//归还书
}
5.设计与数据库中存储对象相同的类
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6.设计BaseDao接口实现类
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public class bookBaseDaoImp implements bookBaseDao {static Scanner scanner =new Scanner(System.in);JdbcTemplate jdbcTemplate =null;public bookBaseDaoImp(){jdbcTemplate=new JdbcTemplate(druidUtils.getDataSource());}@Overridepublic int select() {List<book> arr= jdbcTemplate.query("select count, bookname,author,price,type from book",new BeanPropertyRowMapper<book>(book.class));for (book b:arr) {if (b.getCount()>0){System.out.println("book{bookname = " + b.getBookname() + ", author = " + b.getAuthor() + ", price = " + b.getPrice() + ", type = " + b.getType()+" 还剩"+b.getCount()+"本书 }");}else if (b.getCount()==0){System.out.println("book{bookname = " + b.getBookname() + ", author = " + b.getAuthor() + ", price = " + b.getPrice() + ", type = " + b.getType()+" 已借阅！ }");}}return 0;}@Overridepublic int update(book b) {jdbcTemplate.update("insert into book values (?,?,?,?,?)",b.getCount(), b.getBookname(),b.getAuthor(),b.getPrice(),b.getType());return 1;}@Overridepublic int add(book b) {return 0;}@Overridepublic int deleat() {System.out.println("请输入删除图书的名称：");String name =scanner.next();jdbcTemplate.update("delete from book where bookname=?;",name);return 1;}@Overridepublic List<book> selectname(){System.out.println("请输入查询图书的名称：");String name =scanner.next();return jdbcTemplate.query("select * from book where bookname=? ",new BeanPropertyRowMapper<book>(book.class),name);}@Overridepublic int brow() {String s =scanner.next();List<book> arr= jdbcTemplate.query("select * from book where bookname=?",new BeanPropertyRowMapper<book>(book.class),s);int count =arr.get(0).getCount();if (count==0){return 0;}else if (arr.get(0).getCount()>0){System.out.println("已借阅！");jdbcTemplate.update("update book set count = ? where bookname = ?",count-1,s);}return --count;}@Overridepublic int huan() {String s =scanner.next();List<book> arr= jdbcTemplate.query("select * from book where bookname=?",new BeanPropertyRowMapper<book>(book.class),s);book b = arr.get(0);int a = jdbcTemplate.update("update book set count = ? where bookname = ?",b.getCount()+1,s);return b.getCount()+1;}
}
7.设计前端交互
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public class choise {static Scanner scanner =new Scanner(System.in);static bookBaseDaoImp bookImpDao=null;static {bookImpDao= new bookBaseDaoImp();}public static void main(String[] args) {System.out.println("请输入选择你的你的姓名：");String user =scanner.next();System.out.println("请输入选择你的身份：1-》管理员 ， 2-》普通用户");int num =scanner.nextInt();if (num==2){while (true){if (usersystem(user)) break;}} else if (num==1) {while (true){if (managerSystem(user)) break;}}}private static boolean usersystem(String user) {System.out.println("hello ,用户："+ user +"欢迎来到图书小练习系统");System.out.println("=====用户菜单=====");System.out.println("1.查找图书");System.out.println("2.借阅图书");System.out.println("3.归还图书");System.out.println("0.退出系统");System.out.println("=====用户菜单=====");System.out.println("请输入你的操作：");int choise1= scanner.nextInt();if (choise1==1){List<book> arr= bookImpDao.selectname();System.out.println(arr.get(0));}if (choise1==2){System.out.println("请输入借阅图书的名称：");int a = bookImpDao.brow();System.out.println("此书还剩"+a+"本！");}if (choise1==3){System.out.println("请输入归还图书的名称：");System.out.println("已归还，书库中还剩"+bookImpDao.huan()+"本！");}if (choise1==0){return true;}return false;}private static boolean managerSystem(String user) {System.out.println("hello ,管理员："+ user +"欢迎来到图书小练习系统");System.out.println("=====管理员菜单=====");System.out.println("1.查找图书");System.out.println("2.新增图书");System.out.println("3.删除图书");System.out.println("4.显示图书");System.out.println("0.退出系统");System.out.println("=====管理员菜单=====");System.out.println("请输入你的操作：");int choise1= scanner.nextInt();if (choise1==1){List<book> arr= bookImpDao.selectname();System.out.println(arr.get(0));}if (choise1==2){book book1=new book();System.out.println("请输入新增图书的数量：");int count = scanner.nextInt();book1.setCount(count);System.out.println("请输入新增图书的名称：");String name =scanner.next();book1.setBookname(name);System.out.println("请输入新增图书的作者：");String auther =scanner.next();book1.setAuthor(auther);System.out.println("请输入新增图书的价格：");int price = scanner.nextInt();book1.setPrice(price);System.out.println("请输入新增图书的种类：");String type =scanner.next();book1.setType(type);int a = bookImpDao.update(book1);System.out.println(a);}if (choise1==3){bookImpDao.deleat();}if (choise1==4){System.out.println("显示图书");bookImpDao.select();}if (choise1==0){return true;}return false;}
}
总结：
1.需求分析一定要尽可能全面，不然后续的修改麻烦；
2.清晰的三层架构可以使我们有条理的连接数据库；
3.对于错误的分析尽可能少依赖AI，先自己检查问题！
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