id,device_id,channel, single_channel_length,json_data.channel,json_data.val, create_time INSERT INTO watch_multi_leads_ecg_data id, device_id, channel, single_channel_length, json_data.channel, json_data.val, create_time, #{data.id}, #{data.deviceId}, #{data.channel}, #{data.singleChannelLength}, #{data.channels}, #{data.val}, #{data.createTime}, SELECT COUNT(*) FROM watch_multi_leads_ecg_data WHERE create_time = #{createTime} select * from watch_multi_leads_ecg_data where device_id like #{deviceId} order by create_time desc limit 1