基于springboot实现SSM整合

（1）SpringBoot整合Spring(不存在)

（2）SpringBoot整合SpringMVC(不存在)

（3）SpringBoot整合MyBatis（主要）

一、新建springboot项目。

 在application.yml配置文件中添加数据源信息

二、创建domain.book表对象

package com.itheima.domain;

public class Book {
    private Integer id;
    private String name;
    private String type;
    private String description;

    @Override
    public String toString() {
        return "Book{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", type='" + type + '\'' +
                ", description='" + description + '\'' +
                '}';
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }
}

三、创建dao.BookDao接口，书写数据库方法

package com.itheima.dao;

import com.itheima.domain.Book;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;


@Mapper
public interface BookDao {
    @Select("select * from tb_book where id = #{id}")
    public Book getById(Integer id);
}

四、创建service.BookService接口，书写对应数据库方法

package com.itheima.service;

import com.itheima.domain.Book;

public interface BookService {
    public Book getById(Integer id);
}

五、创建service.impl.BookServiceImpl类封装实现BookService接口方法。

package com.itheima.service.impl;

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

@Service
public class BookServiceImpl implements BookService {

    @Autowired
    private BookDao bookDao;

    @Override
    public Book getById(Integer id) {
        Book book = bookDao.getById(id);
        return book;
    }
}

六、在test中测试

package com.itheima;

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

@SpringBootTest
class Springboot08MybatisApplicationTests {

    @Autowired
    private BookService bookService;

    @Test
    void contextLoads() {
        Book book = bookService.getById(12);
        System.out.println(book);
    }

}

结果：

 不用内置数据源，设置druid数据源。

在pom中添加druid依赖：

<!--        druid数据源-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.16</version>
        </dependency>