springboot查询全部部门流程分析

package com.intelligent_learning_aid_system.controller;
import com.intelligent_learning_aid_system.pojo.Dept;
import com.intelligent_learning_aid_system.pojo.Result;
import com.intelligent_learning_aid_system.service.DeptService;
import lombok.extern.slf4j.Slf4j;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.List;
/**
 * 部门管理Controller
 */
@Slf4j
@RestController
public class DeptController {
    @Autowired
    private DeptService deptService;
    //    @RequestMapping(value = "/depts", method = RequestMethod.GET) // 指定请求参数为 GET
    @GetMapping("/depts") // 等同于上面的写法
    public Result list() {
//        System.out.println("查询全部部门数据");
        log.info("查询全部部门数据");
        // 调用service查询部门数据
        List<Dept> deptList = deptService.list();
        return Result.success(deptList);
    }
}

package com.intelligent_learning_aid_system.service;
import com.intelligent_learning_aid_system.pojo.Dept;
import java.util.List;
/**
 * 部门管理
 */
public interface DeptService {
    /**
     * 查询全部部门
     * @return
     */
    List<Dept> list();
}

package com.intelligent_learning_aid_system.service.impl;
import com.intelligent_learning_aid_system.mapper.DeptMapper;
import com.intelligent_learning_aid_system.pojo.Dept;
import com.intelligent_learning_aid_system.service.DeptService;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.annotations.Select;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Slf4j
@Service
public class DeptServiceImpl implements DeptService {
    @Autowired
    private DeptMapper deptMapper;
    /**
     * 查询全部部门
     */
    public List<Dept> list() {
        return deptMapper.list();
    }
}

package com.intelligent_learning_aid_system.mapper;
import com.intelligent_learning_aid_system.pojo.Dept;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
import org.springframework.web.bind.annotation.GetMapping;
import java.util.List;
/**
 * 部门管理
 */
@Mapper
public interface DeptMapper {
    /**
     * 查询全部部门
     * @return
     */
    @Select("select * from dept")
    List<Dept> list();
}