update 删除班级前校验班级是否有学生

server-db/src/main/java/cn/exploring/engine/server/db/service/ClassService.java

@@ -3,11 +3,14 @@ package cn.exploring.engine.server.db.service;
 import cn.exploring.engine.server.db.dao.ClassInfoMapper;
 import cn.exploring.engine.server.db.domain.ClassInfo;
 import cn.exploring.engine.server.db.domain.ClassInfoExample;
+import cn.exploring.engine.server.db.domain.StudentInfo;
+import cn.exploring.engine.server.db.util.StrUtil;
 import com.github.pagehelper.PageHelper;
 import com.github.pagehelper.PageInfo;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Propagation;
 import org.springframework.transaction.annotation.Transactional;
+import org.springframework.util.CollectionUtils;
 import org.springframework.util.StringUtils;
 
 import javax.annotation.Resource;
@@ -16,6 +19,7 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
+import java.util.stream.Collectors;
 
 @Service
 public class ClassService {
@@ -23,6 +27,9 @@ public class ClassService {
     @Resource
     ClassInfoMapper classInfoMapper;
 
+    @Resource
+    private StudentInfoService studentInfoService;
+
     public Map<Integer, String> getClassNameMap() {
         ClassInfoExample example = new ClassInfoExample();
         ClassInfoExample.Criteria criteria = example.createCriteria();
@@ -95,13 +102,21 @@ public class ClassService {
         classInfoMapper.updateByPrimaryKey(classInfo);
     }
 
-    public Object batchDeletedData(List<Integer> idList) {
+    public String batchDeletedData(List<Integer> idList) {
         List<ClassInfo> classInfoList = selectClass(null, idList);
+        Map<Integer, String> classNameMap = classInfoList.stream().collect(Collectors.toMap(ClassInfo::getId, ClassInfo::getClassName));
+        Map<Integer, List<StudentInfo>> classStudentMap = studentInfoService.selectStudentByClassIdListGroupByClassId(idList);
+        if (!CollectionUtils.isEmpty(classStudentMap) && classStudentMap.values().stream().anyMatch(list -> !CollectionUtils.isEmpty(list))) {
+            return classStudentMap.entrySet().stream().filter(entry -> !CollectionUtils.isEmpty(entry.getValue()))
+                    .map(entry -> StrUtil.format("班级[({}){}]存在学生{}名无法删除", entry.getKey(), classNameMap.get(entry.getKey()), entry.getValue().size()))
+                    .collect(Collectors.joining(", "));
+        }
+
         classInfoList.forEach(x -> {
             x.setDeleted(null);
             updateClassInfo(x);
         });
-        return "batch deleted  OK";
+        return null;
     }
 
     @Transactional(propagation = Propagation.NOT_SUPPORTED, readOnly = true)

server-db/src/main/java/cn/exploring/engine/server/db/service/StudentInfoService.java

@@ -26,6 +26,7 @@ import org.apache.commons.logging.LogFactory;
 import org.springframework.beans.BeanUtils;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Propagation;
 import org.springframework.transaction.annotation.Transactional;
 import org.springframework.util.CollectionUtils;
 import org.springframework.web.multipart.MultipartFile;
@@ -413,4 +414,14 @@ public class StudentInfoService {
             throw new RuntimeException("更新点名次数失败");
         }
     }
+
+    @Transactional(propagation = Propagation.NOT_SUPPORTED, readOnly = true)
+    public Map<Integer, List<StudentInfo>> selectStudentByClassIdListGroupByClassId(Collection<Integer> classIdList) {
+        return CollectionUtils.isEmpty(classIdList) ? ImmutableMap.of()
+                : studentInfoMapper.selectByExample(new StudentInfoExample().createCriteria()
+                        .andDeletedEqualTo(StudentInfo.NOT_DELETED)
+                        .andClassIdIn(new ArrayList<>(classIdList))
+                .example())
+                .stream().collect(Collectors.groupingBy(StudentInfo::getClassId, Collectors.toList()));
+    }
 }

server-wx-api/src/main/java/cn/exploring/engine/server/wx/web/ClassController.java

@@ -3,6 +3,7 @@ package cn.exploring.engine.server.wx.web;
 import cn.exploring.engine.server.core.util.ResponseUtil;
 import cn.exploring.engine.server.db.domain.ClassInfo;
 import cn.exploring.engine.server.db.service.ClassService;
+import org.apache.commons.lang3.StringUtils;
 import org.springframework.validation.annotation.Validated;
 import org.springframework.web.bind.annotation.*;
 
@@ -37,7 +38,8 @@ public class ClassController {
 
     @PostMapping("batchDeleted")
     public Object batchDeleted(@RequestBody List<Integer> idList) {
-        return ResponseUtil.ok(classService.batchDeletedData(idList));
+        String errMsg = classService.batchDeletedData(idList);
+        return StringUtils.isNotBlank(errMsg) ? ResponseUtil.ok("成功") : ResponseUtil.fail(402, errMsg);
     }
 
     @GetMapping("/listAll")