SpringBoot学习：逆向工程-集合MyBatis

SpringBoot学习4：逆向工程&集合MyBatis 逆向工程：

Mybatis的逆向工程功能还是很强大的，可以自动生成实体类以及Mapper文件和对象文件，这样可以大大减少开发人员的工作量。

首先我们要在pom.xml引入依赖


                org.mybatis.generator
                mybatis-generator-maven-plugin
                1.3.6
                
                    
                        mysql
                        mysql-connector-java

                    
                
                
                    
                    GeneratorMapper.xml
                    true
                    true

        
            mysql
            mysql-connector-java

创建generatorConfig.xml文件




    
    
    
    
        
        
            
        
        
        
        
        
        
            
            
        
        
        
            
        
        
        
            
        
        
        配置完后执行逆向工程
自动生成这三个文件
数据库的配置
 
Mybatis集合及运用 
**展示：**我们可以利用Mybatis实现从数据库中查询功能
 
具体实现方法如下： 
 配置Controller文件
 package com.nanjing.springboot.web;


import com.nanjing.springboot.model.Student;
import com.nanjing.springboot.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class StudentController {

    @Autowired
    private StudentService studentService;

    @RequestMapping(value = "/student")
    @ResponseBody
    public Object student(Integer id){
        Student student=studentService.queryStudentById(id);
        return student;
    }
}
 
 配置Service接口
 package com.nanjing.springboot.service;

import com.nanjing.springboot.model.Student;

public interface StudentService {
    
    Student queryStudentById(Integer id);
}
 
 配置实现类
 package com.nanjing.springboot.service.impl;

import com.nanjing.springboot.mapper.StudentMapper;
import com.nanjing.springboot.model.Student;
import com.nanjing.springboot.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class StudentServiceImpl implements StudentService {

    @Autowired
    private StudentMapper studentMapper;
    @Override
    public Student queryStudentById(Integer id) {
        return studentMapper.selectByPrimaryKey(id);
    }
}

 
 配置Mapper类
 package com.nanjing.springboot.mapper;

import com.nanjing.springboot.model.Student;
import org.apache.ibatis.annotations.Mapper;

@Mapper//扫描DAO接口到spring容器
public interface StudentMapper {
    int deleteByPrimaryKey(Integer id);

    int insert(Student record);

    int insertSelective(Student record);

    Student selectByPrimaryKey(Integer id);

    int updateByPrimaryKeySelective(Student record);

    int updateByPrimaryKey(Student record);
}
 
 配置对应的xml类
 


  




    
    
    
  

  
    id, name, age