增加了Staff类作为服务层及DAO层示例

src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/entity/Staff.java

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+package cn.edu.hfut.rmdjzz.projectmanagement.entity;
+
+import com.baomidou.mybatisplus.annotation.IdType;
+import com.baomidou.mybatisplus.annotation.TableId;
+import lombok.Data;
+
+/**
+ * @author 佘语殊
+ * @since 2022/6/28 17:25
+ */
+@Data
+public class Staff {
+    @TableId(type = IdType.AUTO)
+    private Integer staffId;
+    private String staffUsername;
+    private String staffPassword;
+    private String staffNickname;
+    private String staffGender;
+}

src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/mapper/StaffMapper.java

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+package cn.edu.hfut.rmdjzz.projectmanagement.mapper;
+
+import cn.edu.hfut.rmdjzz.projectmanagement.entity.Staff;
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+
+/**
+ * @author 佘语殊
+ * @since 2022/6/28 17:25
+ */
+public interface StaffMapper extends BaseMapper<Staff> {
+}

src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/IStaffService.java

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+package cn.edu.hfut.rmdjzz.projectmanagement.service;
+
+import cn.edu.hfut.rmdjzz.projectmanagement.entity.Staff;
+import com.baomidou.mybatisplus.extension.service.IService;
+
+/**
+ * @author 佘语殊
+ * @since 2022/6/28 17:28
+ */
+public interface IStaffService extends IService<Staff> {
+}

src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/impl/StaffServiceImpl.java

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+package cn.edu.hfut.rmdjzz.projectmanagement.service.impl;
+
+import cn.edu.hfut.rmdjzz.projectmanagement.entity.Staff;
+import cn.edu.hfut.rmdjzz.projectmanagement.mapper.StaffMapper;
+import cn.edu.hfut.rmdjzz.projectmanagement.service.IStaffService;
+import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
+import org.springframework.stereotype.Service;
+
+/**
+ * @author 佘语殊
+ * @since 2022/6/28 17:29
+ */
+@Service
+public class StaffServiceImpl extends ServiceImpl<StaffMapper, Staff> implements IStaffService {
+}

src/test/java/cn/edu/hfut/rmdjzz/projectmanagement/MybatisPlusTests.java

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+package cn.edu.hfut.rmdjzz.projectmanagement;
+
+import cn.edu.hfut.rmdjzz.projectmanagement.service.impl.StaffServiceImpl;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import lombok.SneakyThrows;
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import javax.annotation.Resource;
+
+/**
+ * @author 佘语殊
+ * @since 2022/6/28 17:31
+ */
+@SpringBootTest
+public class MybatisPlusTests {
+
+    @Resource
+    StaffServiceImpl staffService;
+    @Resource
+    private ObjectMapper objectMapper;
+
+    @SneakyThrows
+    @Test
+    public void test() {
+        System.out.println(objectMapper.writeValueAsString(staffService.list()));
+    }
+}