package demo.yangxu.springboot.mapper;

import demo.yangxu.springboot.bean.Department;
import org.apache.ibatis.annotations.*;

//指定这是一个操作数据库的mapper
@Mapper
public interface DepartmentMapper {
    @Select("SELECT * FROM department WHERE id=#{id}")
    public Department getDeptById(Integer id);

    @Delete("DELETE FROM department WHERE id=#{id}")
    public int deleteDeptById(Integer id);

    //useGeneratedKeys = true使用自动生成的主键
    //keyProperty = "id" Department中的id属性是用来封装的主键
    @Options(useGeneratedKeys = true,keyProperty = "id")
    @Insert("INSERT INTO department(departmentName) VALUES(#{departmentName})")
    public int insertDept(Department department);

    @Update("UPDATE department SET departmentName=#{departmentName} WHERE id=#{id}")
    public int updateDept(Department department);
}

package demo.yangxu.springboot.controller;

import demo.yangxu.springboot.bean.Department;
import demo.yangxu.springboot.mapper.DepartmentMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class DeptController {

    @Autowired
    DepartmentMapper departmentMapper;

    @GetMapping("/dept/{id}")
    public Department getDeptById(@PathVariable("id") Integer id){
        return departmentMapper.getDeptById(id);
    }

    @GetMapping("/dept")
    public Department insertDept(Department department){
        departmentMapper.insertDept(department);
        return department;
    }

}

package demo.yangxu.springboot.config;

import org.apache.ibatis.session.Configuration;
import org.mybatis.spring.boot.autoconfigure.ConfigurationCustomizer;
import org.springframework.context.annotation.Bean;

@org.springframework.context.annotation.Configuration
public class MyBatisConfig {
    @Bean
    public ConfigurationCustomizer configurationCustomizer(){
        return new ConfigurationCustomizer(){

            @Override
            public void customize(Configuration configuration) {
                configuration.setMapUnderscoreToCamelCase(true);
            }
        };
    }
}

package demo.yangxu.springboot;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@MapperScan(value = "demo.yangxu.springboot.mapper")
@SpringBootApplication
public class Springboot05DataMybatisApplication {

    public static void main(String[] args) {
        SpringApplication.run(Springboot05DataMybatisApplication.class, args);
    }

}