feat(class): 添加班级删除功能

- 在班级列表表格中新增“操作”列，添加删除按钮
- 实现删除班级的接口调用逻辑
- 删除成功后刷新班级列表
- 删除当前选中班级时清空选中状态
- 添加成功和失败的用户提示信息

enlish-service/src/main/java/com/yinlihupo/enlish/service/controller/ClassController.java

@@ -2,6 +2,8 @@ package com.yinlihupo.enlish.service.controller;
 
 import com.yinlihupo.enlish.service.domain.dataobject.ClassDO;
 import com.yinlihupo.enlish.service.domain.dataobject.GradeDO;
+import com.yinlihupo.enlish.service.model.vo.classs.AddClassReqVO;
+import com.yinlihupo.enlish.service.model.vo.classs.DeleteClassReqVO;
 import com.yinlihupo.enlish.service.model.vo.classs.FindClassReqVO;
 import com.yinlihupo.enlish.service.model.vo.classs.FindClassRspVO;
 import com.yinlihupo.enlish.service.service.ClassService;
@@ -41,4 +43,16 @@ public class ClassController {
 
         return PageResponse.success(findClassRspVOS, page, total, pageSize);
     }
+
+    @PostMapping("add")
+    @ApiOperationLog(description = "添加班级")
+    public void addClass(@RequestBody AddClassReqVO addClassReqVO) {
+        classService.addClass(addClassReqVO.getTitle(), addClassReqVO.getGradeId());
+    }
+
+    @PostMapping("delete")
+    @ApiOperationLog(description = "删除班级")
+    public void deleteClass(@RequestBody DeleteClassReqVO deleteClassReqVO) {
+        classService.deleteClass(deleteClassReqVO.getId());
+    }
 }

enlish-service/src/main/java/com/yinlihupo/enlish/service/domain/mapper/ClassDOMapper.java

@@ -14,4 +14,8 @@ public interface ClassDOMapper {
     Integer selectClassDOCount();
 
     List<ClassDO> selectClassDOListByIds(@Param("classIds") List<Integer> classIds);
+
+    void insert(ClassDO classDO);
+
+    void delete(@Param("id") Integer id);
 }

enlish-service/src/main/java/com/yinlihupo/enlish/service/domain/mapper/GradeClassDOMapper.java

@@ -7,4 +7,10 @@ import java.util.List;
 
 public interface GradeClassDOMapper {
     List<GradeClassDO> selectByClassIds(@Param("classIds") List<Integer> classIds);
+
+    void insert(@Param("classId") Integer classId, @Param("gradeId") Integer gradeId);
+
+    void deleteByClassId(@Param("classId") Integer classId);
+
+    Integer selectByGradeId(@Param("gradeId") Integer gradeId);
 }

enlish-service/src/main/java/com/yinlihupo/enlish/service/model/vo/classs/AddClassReqVO.java

@@ -0,0 +1,16 @@
+package com.yinlihupo.enlish.service.model.vo.classs;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@AllArgsConstructor
+@NoArgsConstructor
+@Data
+@Builder
+public class AddClassReqVO {
+
+    private String title;
+    private Integer gradeId;
+}

enlish-service/src/main/java/com/yinlihupo/enlish/service/model/vo/classs/DeleteClassReqVO.java

@@ -0,0 +1,15 @@
+package com.yinlihupo.enlish.service.model.vo.classs;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@AllArgsConstructor
+@NoArgsConstructor
+@Builder
+@Data
+public class DeleteClassReqVO {
+
+    private Integer id;
+}

enlish-service/src/main/java/com/yinlihupo/enlish/service/service/ClassService.java

@@ -15,4 +15,8 @@ public interface ClassService {
     int getClassCount();
 
     Map<Integer, GradeDO> findClassIds2GradeMap(List<Integer> classIds);
+
+    void addClass(String className, Integer gradeId);
+
+    void deleteClass(Integer classId);
 }

enlish-service/src/main/java/com/yinlihupo/enlish/service/service/classs/ClassServiceImpl.java

@@ -70,4 +70,18 @@ public class ClassServiceImpl implements ClassService {
                 HashMap::new                     // 指定返回 HashMap
         ));
     }
+
+    @Override
+    public void addClass(String className, Integer gradeId) {
+        ClassDO classDO = ClassDO.builder().title(className).build();
+        classDOMapper.insert(classDO);
+        Integer id = classDO.getId();
+
+        gradeClassDOMapper.insert(id, gradeId);
+    }
+
+    @Override
+    public void deleteClass(Integer classId) {
+        classDOMapper.delete(classId);
+    }
 }

enlish-service/src/main/java/com/yinlihupo/enlish/service/service/grade/GradeServiceImpl.java

@@ -1,6 +1,7 @@
 package com.yinlihupo.enlish.service.service.grade;
 
 import com.yinlihupo.enlish.service.domain.dataobject.GradeDO;
+import com.yinlihupo.enlish.service.domain.mapper.GradeClassDOMapper;
 import com.yinlihupo.enlish.service.domain.mapper.GradeDOMapper;
 import com.yinlihupo.enlish.service.service.GradeService;
 import jakarta.annotation.Resource;
@@ -13,6 +14,8 @@ public class GradeServiceImpl implements GradeService {
 
     @Resource
     private GradeDOMapper gradeDOMapper;
+    @Resource
+    private GradeClassDOMapper gradeClassDOMapper;
 
     @Override
     public GradeDO findByClassId(Integer classId) {
@@ -36,6 +39,12 @@ public class GradeServiceImpl implements GradeService {
 
     @Override
     public void delete(Integer id) {
-        gradeDOMapper.deleteById(id);
+
+        Integer classIds = gradeClassDOMapper.selectByGradeId(id);
+        if (classIds == null || classIds == 0) {
+            gradeDOMapper.deleteById(id);
+        } else {
+            throw new RuntimeException("请先删除与该年级关联的班级");
+        }
     }
 }

enlish-service/src/main/resources/mapper/ClassDOMapper.xml

@@ -32,5 +32,14 @@
         </foreach>
     </select>
 
+    <insert id="insert" useGeneratedKeys="true" keyProperty="id">
+        insert into `class`
+        (title)
+        values (#{title})
+    </insert>
 
+    <delete id="delete">
+        delete from `class`
+        where id = #{id}
+    </delete>
 </mapper>

enlish-service/src/main/resources/mapper/GradeClassDOMapper.xml

@@ -6,12 +6,27 @@
         <result column="class_id" jdbcType="INTEGER" property="classId" />
         <result column="grade_id" jdbcType="INTEGER" property="gradeId" />
     </resultMap>
-    
+
     <select id="selectByClassIds" resultMap="BaseResultMap">
         select * from grade_class where class_id in
         <foreach collection="classIds" item="classId" separator="," open="(" close=")">
             #{classId}
         </foreach>
     </select>
+    <select id="selectByGradeId" resultType="java.lang.Integer">
+        select count(1)
+        from grade_class
+        where grade_id = #{gradeId}
+    </select>
 
+    <insert id="insert">
+        insert into grade_class
+            (class_id, grade_id)
+        values
+            (#{classId}, #{gradeId})
+    </insert>
+
+    <delete id="deleteByClassId">
+        delete from grade_class where class_id = #{classId}
+    </delete>
 </mapper>