Merge remote-tracking branch 'origin/backendDev' into backendDev

backend/src/main/java/com/nav/dao/MajorDao.java

+package com.nav.dao;
+
+import com.nav.pojo.Major;
+import org.apache.ibatis.annotations.Mapper;
+import java.util.List;
+
+/**
+ * @ClassName MajorDao
+ * @Description MajorMapper 数据访问
+ * @Date 2022/4/29 18:45
+ * @Author hck
+ */
+@Mapper
+public interface MajorDao {
+    /**
+     *查找专业列表
+     * @return List<Major>
+     */
+    public List<Major> selectMajor();
+
+    /**
+     *根据学科查找专业列表
+     * @param subject
+     * @return List<Major>
+     */
+    public List<Major> selectMajorBySubject(String subject);
+
+    /**
+     *根据id查找专业信息
+     * @param id
+     * @return Major
+     */
+    public Major selectMajorById(long id);
+
+    /**
+     * 根据专业名称查找专业信息
+     * @param name
+     * @return Major
+     */
+    public Major selectMajorByName(String name);
+
+}

backend/src/main/java/com/nav/service/MajorService.java

+package com.nav.service;
+
+import com.nav.common.api.CommonResult;
+
+/**
+ * @ClassName MajorService
+ * @Description MajorService业务层
+ * @Date 2022/4/29 19:17
+ * @Author hck
+ */
+public interface MajorService {
+    /**
+     * 查询所有专业
+     * @return CommonResult
+     */
+    public CommonResult getMajor();
+
+    /**
+     * 根据学科查询专业
+     * @param subject
+     * @return CommonResult
+     */
+    public CommonResult getMajorBySubject(String subject);
+
+    /**
+     * 根据id查询专业
+     * @param id
+     * @return CommonResult
+     */
+    public CommonResult getMajorById(long id);
+
+}

backend/src/main/java/com/nav/service/MajorServiceImpl.java

+package com.nav.service;
+
+import com.nav.common.api.CommonResult;
+import com.nav.dao.MajorDao;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+/**
+ * @ClassName MajorServiceImpl
+ * @Description MajorServiceImpl
+ * @Date 2022/4/29 19:24
+ * @Author hck
+ */
+
+@Service
+public class MajorServiceImpl implements MajorService{
+    @Autowired
+    MajorDao majorDao;
+
+    @Override
+    public CommonResult getMajor() {
+        return CommonResult.success(majorDao.selectMajor(),"success");
+    }
+
+    @Override
+    public CommonResult getMajorBySubject(String subject) {
+        return CommonResult.success(majorDao.selectMajorBySubject(subject),"success");
+    }
+
+    @Override
+    public CommonResult getMajorById(long id) {
+        return CommonResult.success(majorDao.selectMajorById(id),"success");
+    }
+}

backend/src/main/resources/mapper/MajorMapper.xml

+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE mapper
+        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
+        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+<mapper namespace="com.nav.dao.UserDao">
+    <select id="selectMajor"  resultType="com.nav.pojo.Major">
+        select id,name
+        from major
+    </select>
+
+    <select id="selectMajorBySubject" parameterType="String" resultType="com.nav.pojo.Major">
+        select id,name
+        from major
+        where subject = #{subject}
+    </select>
+
+    <select id="selectMajorById" parameterType="long" resultType="com.nav.pojo.Major">
+        select *
+        from major
+        where id = #{id}
+    </select>
+
+    <select id="selectMajorByName" parameterType="String" resultType="com.nav.pojo.Major">
+        select *
+        from major
+        where name = #{name}
+    </select>
+
+</mapper>
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