spring boot 业务层开发

标准开发基本CRUD

第一步，数据库

构建类

package com.spring1.domain;

import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;

@TableName("Book")
@Data
public class Book {
    
    
    private String name;
    private String author;
    private double price;
    private int number;
}

package com.spring1.dao;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.spring1.domain.Book;
import org.apache.ibatis.annotations.Mapper;

@Mapper
public interface BookDao extends BaseMapper<Book> {
    
    
}

构建service层

package com.spring1.service;

import com.spring1.domain.Book;

import java.util.List;

public interface BookService {
    
    
    Boolean save(Book book);
    Boolean update(Book book);
    Boolean delete(String name);
    Book getById(String name);
    List<Book> getAll();
}

package com.spring1.service;

import com.spring1.dao.BookDao;
import com.spring1.domain.Book;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class BookServicelmpl implements BookService {
    
    

    @Autowired
    private BookDao bookDao;

    @Override
    public Boolean save(Book book) {
    
    
        return bookDao.insert(book) > 0;
    }

    @Override
    public Boolean update(Book book) {
    
    
        return bookDao.updateById(book) > 0;
    }

    @Override
    public Boolean delete(String name) {
    
    
        return bookDao.deleteById(name) > 0;
    }

    @Override
    public Book getById(String name) {
    
    
        return bookDao.selectById(name);
    }

    @Override
    public List<Book> getAll() {
    
    
        return bookDao.selectList(null);
    }
}

快速开发

构建service层

package com.spring1.service;

import com.baomidou.mybatisplus.extension.service.IService;
import com.spring1.domain.Book;

public interface IBookService extends IService<Book> {
    
    
}

点击ctrl+O可以看到：

已经实现大量方法，还可以重构。

package com.spring1.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.spring1.dao.BookDao;
import com.spring1.domain.Book;
import com.spring1.service.IBookService;
import org.springframework.stereotype.Service;

@Service
public class IBookServicelmpl extends ServiceImpl<BookDao, Book> implements IBookService {
    
    
}

测试：

package com.spring1;

import com.spring1.domain.Book;
import com.spring1.service.IBookService;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
public class Test1 {
    
    
    @Autowired
    private IBookService bookService;

    @Test
    void testservice() {
    
    
        bookService.list(null);
    }

}