專案階段三：圖書模組的資料庫準備與dao、Service層
阿新 • • 發佈：2021-01-06
1、編寫圖書模組的資料庫表
drop table if exists t_book;
create table t_book(
`id` int primary key auto_increment,
`bookname` varchar (100),
`author` varchar (100),
`price` decimal (11,2),
`sales` int,
`stock` int,
`img_path` varchar (200)
);
插入初始化測試資料
insert into t_book(`id` , `bookname` , `author` , `price` , `sales` , `stock` , `img_path`) values(null , 'java從入門到放棄' , '國哥' , 80 , 9999 , 9 , 'static/img/default.jpg'); insert into t_book(`id` , `bookname` , `author` , `price` , `sales` , `stock` , `img_path`) values(null , '資料結構與演算法' , '嚴敏君' , 78.5 , 6 , 13 , 'static/img/default.jpg'); insert into t_book(`id` , `bookname` , `author` , `price` , `sales` , `stock` , `img_path`) values(null , '怎樣拐跑別人的媳婦' , '龍伍' , 68, 99999 , 52 , 'static/img/default.jpg'); insert into t_book(`id` , `bookname` , `author` , `price` , `sales` , `stock` , `img_path`) values(null , '木虛肉蓋飯' , '小胖' , 16, 1000 , 50 , 'static/img/default.jpg'); insert into t_book(`id` , `bookname` , `author` , `price` , `sales` , `stock` , `img_path`) values(null , 'C++程式設計思想' , '剛哥' , 45.5 , 14 , 95 , 'static/img/default.jpg'); insert into t_book(`id` , `bookname` , `author` , `price` , `sales` , `stock` , `img_path`) values(null , '蛋炒飯' , '周星星' , 9.9, 12 , 53 , 'static/img/default.jpg'); insert into t_book(`id` , `bookname` , `author` , `price` , `sales` , `stock` , `img_path`) values(null , '賭神' , '龍伍' , 66.5, 125 , 535 , 'static/img/default.jpg'); insert into t_book(`id` , `bookname` , `author` , `price` , `sales` , `stock` , `img_path`) values(null , 'Java程式設計思想' , '陽哥' , 99.5 , 47 , 36 , 'static/img/default.jpg'); insert into t_book(`id` , `bookname` , `author` , `price` , `sales` , `stock` , `img_path`) values(null , 'JavaScript從入門到精通' , '婷姐' , 9.9 , 85 , 95 , 'static/img/default.jpg'); insert into t_book(`id` , `bookname` , `author` , `price` , `sales` , `stock` , `img_path`) values(null , 'cocos2d-x遊戲程式設計入門' , '國哥' , 49, 52 , 62 , 'static/img/default.jpg'); insert into t_book(`id` , `bookname` , `author` , `price` , `sales` , `stock` , `img_path`) values(null , 'C語言程式設計' , '譚浩強' , 28 , 52 , 74 , 'static/img/default.jpg'); insert into t_book(`id` , `bookname` , `author` , `price` , `sales` , `stock` , `img_path`) values(null , 'Lua語言程式設計' , '雷豐陽' , 51.5 , 48 , 82 , 'static/img/default.jpg'); insert into t_book(`id` , `bookname` , `author` , `price` , `sales` , `stock` , `img_path`) values(null , '西遊記' , '羅貫中' , 12, 19 , 9999 , 'static/img/default.jpg'); insert into t_book(`id` , `bookname` , `author` , `price` , `sales` , `stock` , `img_path`) values(null , '水滸傳' , '華仔' , 33.05 , 22 , 88 , 'static/img/default.jpg'); insert into t_book(`id` , `bookname` , `author` , `price` , `sales` , `stock` , `img_path`) values(null , '作業系統原理' , '劉優' , 133.05 , 122 , 188 , 'static/img/default.jpg'); insert into t_book(`id` , `bookname` , `author` , `price` , `sales` , `stock` , `img_path`) values(null , '資料結構 java版' , '封大神' , 173.15 , 21 , 81 , 'static/img/default.jpg'); insert into t_book(`id` , `bookname` , `author` , `price` , `sales` , `stock` , `img_path`) values(null , 'UNIX高階環境程式設計' , '樂天' , 99.15 , 210 , 810 , 'static/img/default.jpg'); insert into t_book(`id` , `bookname` , `author` , `price` , `sales` , `stock` , `img_path`) values(null , 'javaScript高階程式設計' , '國哥' , 69.15 , 210 , 810 , 'static/img/default.jpg'); insert into t_book(`id` , `bookname` , `author` , `price` , `sales` , `stock` , `img_path`) values(null , '大話設計模式' , '國哥' , 89.15 , 20 , 10 , 'static/img/default.jpg'); insert into t_book(`id` , `bookname` , `author` , `price` , `sales` , `stock` , `img_path`) values(null , '人月神話' , '剛哥' , 88.15 , 20 , 80 , 'static/img/default.jpg');
2、編寫圖書模組的 JavaBean
private Integer id; private String name; private String author; private BigDecimal price; private Integer sales; private Integer stock; private String imgPath = "static/img/default.jpg"; public Book(Integer id, String bookName, String author, BigDecimal price, Integer sales, Integer stock, String imgPath) { this.id = id; this.bookName = bookName; this.author = author; this.price = price; this.sales = sales; this.stock = stock; // 要求給定的圖書封面圖書路徑不能為空 if(imgPath != null && ! "".equals(imgPath)){ this.imgPath = imgPath; } } public void setImgPath(String imgPath) { // 要求給定的圖書封面圖書路徑不能為空 if(imgPath != null && ! "".equals(imgPath)){ this.imgPath = imgPath; } }
3、編寫圖書模組的 Dao 和測試 Dao
Dao 介面：
public interface BookDao { /** * 新增圖書 * * @param book 要新增的圖書的資訊 * @return -1：新增失敗，其它數字表示返回新增圖書的本數 */ int addBook(Book book); /** * 修改圖書資訊 * @param book 要修改的圖書的資訊 * @return -1：修改失敗，其它數字表示返回新增圖書的本數 */ int updateBook(Book book); /** * 通過ID刪除圖書 * @param id 要刪除圖書的ID * @return -1：刪除失敗，其它數字表示返回新增圖書的本數 */ int deleteBookById(Integer id); /** * 通過ID查詢圖書 * @param id 要查詢圖書的ID * @return 所查詢的圖書的資訊 */ Book queryBookById(Integer id); /** * 檢視所圖書資訊 * @return 資料庫裡所圖書資訊集合 */ List<Book> queryBooks(); }
BookDaoImpl 實現類：
public class BookDaoImpl extends BaseDao implements BookDao {
@Override
public int addBook(Book book) {
String sql = "insert into t_book (`bookname`,`author`,`price`,`sales`,`stock`,`img_path`)" +
" values(?,?,?,?,?,?)";
return upDate(sql,book.getBookName(),book.getAuthor(),book.getPrice(),book.getSales(),book.getStock(),book.getImgPath());
}
@Override
public int updateBook(Book book) {
String sql = "update t_book set `bookname`=?,`author`=?,`price`=?,`sales`=?,`stock`=?,`img_path`=? where id=?";
return upDate(sql,book.getBookName(),book.getAuthor(),book.getPrice(),book.getSales(),book.getStock(),book.getImgPath(),book.getId());
}
@Override
public int deleteBookById(Integer id) {
String sql = "delete from t_book where id = ?";
return upDate(sql,id);
}
@Override
public Book queryBookById(Integer id) {
String sql = "select `id` , `bookname` , `author` , `price` , `sales` , `stock` , `img_path` imgPath from t_book where id = ?";
return queryForOne(Book.class,sql,id);
}
@Override
public List<Book> queryBooks() {
String sql = "select `id` , `bookname` , `author` , `price` , `sales` , `stock` , `img_path` imgPath from t_book";
return queryForList(Book.class,sql);
}
}
BookDao 的測試：
public class BookDaoTest {
private BookDao bookDao = new BookDaoImpl();
@Test
public void addBook() {
bookDao.addBook(new Book(null,"安徒生童話","安徒生",new BigDecimal(22.2),99,8,null));
}
@Test
public void updateBook() {
bookDao.updateBook(new Book(21,"安徒生童話大全","安徒生",new BigDecimal(33.3),99,8,null));
}
@Test
public void deleteBookById() {
bookDao.deleteBookById(21);
}
@Test
public void queryBookById() {
System.out.println(bookDao.queryBookById(12));
}
@Test
public void queryBooks() {
List<Book> books = bookDao.queryBooks();
for(Book book : books){
System.out.println(book);
}
}
}
4、編寫圖書模組的 Service 和測試 Service
BookService 介面：
public interface BookService {
/**
* 新增圖書
* @param book 要新增的圖書的資訊
*/
void addBook(Book book);
/**
* 通過ID刪除圖書
* @param id 要刪除圖書的ID
*/
void deleteBookById(Integer id);
/**
* 修改圖書資訊
* @param book 要修改的圖書的資訊
*/
void updateBook(Book book);
/**
* 通過ID查詢圖書
* @param id 要查詢圖書的ID
* @return 所查詢的圖書的資訊
*/
Book queryBookById(Integer id);
/**
* 檢視所圖書資訊
* @return 資料庫裡所圖書資訊集合
*/
List<Book> queryBooks();
}
BookServiceImpl 實現類：
public class BookServiceImpl implements BookService {
BookDao bookDao = new BookDaoImpl();
@Override
public void addBook(Book book) {
bookDao.addBook(book);
}
@Override
public void deleteBookById(Integer id) {
bookDao.deleteBookById(id);
}
@Override
public void updateBook(Book book) {
bookDao.updateBook(book);
}
@Override
public Book queryBookById(Integer id) {
return bookDao.queryBookById(id);
}
@Override
public List<Book> queryBooks() {
return bookDao.queryBooks();
}
}
BookService 的測試：
public class BookServiceTest {
private BookService bookService = new BookServiceImpl();
@Test
public void addBook() {
bookService.addBook(new Book(null,"安徒生童話","安徒生",new BigDecimal(22.2),99,8,null));
}
@Test
public void deleteBookById() {
bookService.deleteBookById(22);
}
@Test
public void updateBook() {
bookService.updateBook(new Book(22,"安徒生","安徒生",new BigDecimal(22.2),99,8,null));
}
@Test
public void queryBookById() {
System.out.println(bookService.queryBookById(12));
}
@Test
public void queryBooks() {
List<Book> books = bookService.queryBooks();
for(Book book : books){
System.out.println(book);
}
}
}