|  |  | 
 |  |  |  | 
 |  |  |     @Select("select count(1) from wvp_device_channel") | 
 |  |  |     int getAllChannelCount(); | 
 |  |  |  | 
 |  |  |     // 设备主子码流逻辑START | 
 |  |  |     @Update(value = {"UPDATE wvp_device_channel SET stream_id=null WHERE device_id=#{deviceId}"}) | 
 |  |  |     void clearPlay(String deviceId); | 
 |  |  |     // 设备主子码流逻辑END | 
 |  |  |     @Select(value = {" <script>" + | 
 |  |  |             "select * " + | 
 |  |  |             "from wvp_device_channel " + | 
 |  |  |             "where device_id=#{deviceId}" + | 
 |  |  |             " <if test='parentId != null and parentId != deviceId'> and parent_id = #{parentId} </if>" + | 
 |  |  |             " <if test='parentId == null or parentId == deviceId'> and parent_id is null or parent_id = #{deviceId}</if>" + | 
 |  |  |             " <if test='onlyCatalog == true '> and parental = 1 </if>" + | 
 |  |  |             " </script>"}) | 
 |  |  |     List<DeviceChannel> getSubChannelsByDeviceId(String deviceId, String parentId, boolean onlyCatalog); | 
 |  |  |  | 
 |  |  | } |