修改代码

src/main/java/com/ruoyi/device/domain/api/IGroupDomain.java

@@ -58,4 +58,12 @@ public interface IGroupDomain
      * @return 结果
      */
     int deleteGroupByGroupIds(Long[] groupIds);
+
+    /**
+     * 根据分组名称查询分组
+     *
+     * @param groupName 分组名称
+     * @return 分组
+     */
+    Group selectGroupByGroupName(String groupName);
 }

src/main/java/com/ruoyi/device/domain/impl/GroupDomainImpl.java

@@ -68,4 +68,11 @@ public class GroupDomainImpl implements IGroupDomain
     {
         return groupMapper.deleteGroupByGroupIds(groupIds);
     }
+
+    @Override
+    public Group selectGroupByGroupName(String groupName)
+    {
+        GroupEntity entity = groupMapper.selectGroupByGroupName(groupName);
+        return GroupConvert.from(entity);
+    }
 }

src/main/java/com/ruoyi/device/mapper/GroupMapper.java

@@ -58,4 +58,12 @@ public interface GroupMapper
      * @return 影响行数
      */
     int deleteGroupByGroupIds(Long[] groupIds);
+
+    /**
+     * 根据分组名称查询分组
+     *
+     * @param groupName 分组名称
+     * @return 分组信息
+     */
+    GroupEntity selectGroupByGroupName(String groupName);
 }

src/main/java/com/ruoyi/device/service/impl/GroupServiceImpl.java

@@ -63,6 +63,13 @@ public class GroupServiceImpl implements IGroupService
     @Override
     public int updateGroup(GroupDTO groupDTO)
     {
+        // 校验分组名称是否已被其他分组使用
+        Group existingGroup = groupDomain.selectGroupByGroupName(groupDTO.getGroupName());
+        if (existingGroup != null && !existingGroup.getGroupId().equals(groupDTO.getGroupId()))
+        {
+            throw new RuntimeException("分组名称已存在: " + groupDTO.getGroupName());
+        }
+
         Group model = GroupDTOConvert.to(groupDTO);
         return groupDomain.updateGroup(model);
     }
@@ -82,6 +89,13 @@ public class GroupServiceImpl implements IGroupService
     @Override
     public Long createGroup(GroupDTO groupDTO)
     {
+        // 校验分组名称是否已存在
+        Group existingGroup = groupDomain.selectGroupByGroupName(groupDTO.getGroupName());
+        if (existingGroup != null)
+        {
+            throw new RuntimeException("分组名称已存在: " + groupDTO.getGroupName());
+        }
+
         Group model = GroupDTOConvert.to(groupDTO);
         groupDomain.insertGroup(model);
         return model.getGroupId();

src/main/resources/mapper/device/GroupMapper.xml

@@ -25,6 +25,11 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
         where group_id = #{groupId}
     </select>
 
+    <select id="selectGroupByGroupName" parameterType="String" resultMap="GroupResult">
+        <include refid="selectGroupVo"/>
+        where group_name = #{groupName}
+    </select>
+
     <select id="selectGroupList" parameterType="com.ruoyi.device.mapper.entity.GroupEntity" resultMap="GroupResult">
         <include refid="selectGroupVo"/>
         <where>