1.定義用戶變量(或者賦值)
set @變量名=值
-- 創建自定義用戶變量，噹噹前的用斷開連接的時候就會消失
set @value=1;
set @pid=1162;
set @smart_id=1356;
select * from tb_iot where corp_id=115 and pid=@pid and properties like CONCAT('%',@smart_id,'%');
應用範例：複製一個大棚後，增加修改數據。
#複製大棚#2，改下面的參數。
#1更新網關ID 更新一個棚所有網關
set @name='大棚#6';
set @pidPeng=1627; #大棚id 下的所有
set @pidAllSmart=1628; #所有智能設備 下的所有
set @NewgatewayId=20190027;
#以上參數要改
set @OldgatewayId=20190020; #原 複製大棚#2的數據
update tb_iot set properties=REPLACE(properties,CONCAT('"gatewayId":"',@OldgatewayId,'"'),CONCAT('"gatewayId":"',@NewgatewayId,'"')) where corp_id=115 and name=@name;
update tb_iot set properties=REPLACE(properties,CONCAT('"gatewayId":"',@OldgatewayId,'"'),CONCAT('"gatewayId":"',@NewgatewayId,'"')) where corp_id=115 and pid in (@pidPeng,@pidAllSmart); #大棚id 和 #所有智能設備
#2更新傳感器的smartid
#set @pidPeng=1539; #大棚id 下的所有 同上
set @Newsmart_id=1629; #新電磁閥
#以上參數要改
set @Oldsmart_id=1442; #原電磁閥 複製大棚#2的數據
update tb_iot set smart_id=@Newsmart_id ,properties=REPLACE(properties,CONCAT('"smartId":"',@Oldsmart_id,'"'),CONCAT('"smartId":"',@Newsmart_id,'"')) where corp_id=115 and pid=@pidPeng and properties like CONCAT('%"smartId":"',@Oldsmart_id,'"%');
set @Newsmart_id=@Newsmart_id+1; #新 卷被
set @Oldsmart_id=@Oldsmart_id+1; #原
update tb_iot set smart_id=@Newsmart_id ,properties=REPLACE(properties,CONCAT('"smartId":"',@Oldsmart_id,'"'),CONCAT('"smartId":"',@Newsmart_id,'"')) where corp_id=115 and pid=@pidPeng and properties like CONCAT('%"smartId":"',@Oldsmart_id,'"%');
set @Newsmart_id=@Newsmart_id+1; #新 土壤溫溼度#3
set @Oldsmart_id=@Oldsmart_id+1; #原
update tb_iot set smart_id=@Newsmart_id ,properties=REPLACE(properties,CONCAT('"smartId":"',@Oldsmart_id,'"'),CONCAT('"smartId":"',@Newsmart_id,'"')) where corp_id=115 and pid=@pidPeng and properties like CONCAT('%"smartId":"',@Oldsmart_id,'"%');
set @Newsmart_id=@Newsmart_id+1; #新
set @Oldsmart_id=@Oldsmart_id+1; #原
update tb_iot set smart_id=@Newsmart_id ,properties=REPLACE(properties,CONCAT('"smartId":"',@Oldsmart_id,'"'),CONCAT('"smartId":"',@Newsmart_id,'"')) where corp_id=115 and pid=@pidPeng and properties like CONCAT('%"smartId":"',@Oldsmart_id,'"%');
set @Newsmart_id=@Newsmart_id+1; #新
set @Oldsmart_id=@Oldsmart_id+1; #原
update tb_iot set smart_id=@Newsmart_id ,properties=REPLACE(properties,CONCAT('"smartId":"',@Oldsmart_id,'"'),CONCAT('"smartId":"',@Newsmart_id,'"')) where corp_id=115 and pid=@pidPeng and properties like CONCAT('%"smartId":"',@Oldsmart_id,'"%');
set @Newsmart_id=@Newsmart_id+1; #新
set @Oldsmart_id=@Oldsmart_id+1; #原
update tb_iot set smart_id=@Newsmart_id ,properties=REPLACE(properties,CONCAT('"smartId":"',@Oldsmart_id,'"'),CONCAT('"smartId":"',@Newsmart_id,'"')) where corp_id=115 and pid=@pidPeng and properties like CONCAT('%"smartId":"',@Oldsmart_id,'"%');
set @Newsmart_id=@Newsmart_id+1; #新
set @Oldsmart_id=@Oldsmart_id+1; #原
update tb_iot set smart_id=@Newsmart_id ,properties=REPLACE(properties,CONCAT('"smartId":"',@Oldsmart_id,'"'),CONCAT('"smartId":"',@Newsmart_id,'"')) where corp_id=115 and pid=@pidPeng and properties like CONCAT('%"smartId":"',@Oldsmart_id,'"%');
set @Newsmart_id=@Newsmart_id+1; #新
set @Oldsmart_id=@Oldsmart_id+1; #原
update tb_iot set smart_id=@Newsmart_id ,properties=REPLACE(properties,CONCAT('"smartId":"',@Oldsmart_id,'"'),CONCAT('"smartId":"',@Newsmart_id,'"')) where corp_id=115 and pid=@pidPeng and properties like CONCAT('%"smartId":"',@Oldsmart_id,'"%');
set @Newsmart_id=@Newsmart_id+1; #新
set @Oldsmart_id=@Oldsmart_id+1; #原
update tb_iot set smart_id=@Newsmart_id ,properties=REPLACE(properties,CONCAT('"smartId":"',@Oldsmart_id,'"'),CONCAT('"smartId":"',@Newsmart_id,'"')) where corp_id=115 and pid=@pidPeng and properties like CONCAT('%"smartId":"',@Oldsmart_id,'"%');
set @Newsmart_id=@Newsmart_id+1; #新
set @Oldsmart_id=@Oldsmart_id+1; #原
update tb_iot set smart_id=@Newsmart_id ,properties=REPLACE(properties,CONCAT('"smartId":"',@Oldsmart_id,'"'),CONCAT('"smartId":"',@Newsmart_id,'"')) where corp_id=115 and pid=@pidPeng and properties like CONCAT('%"smartId":"',@Oldsmart_id,'"%');
set @Newsmart_id=@Newsmart_id+1; #新
set @Oldsmart_id=@Oldsmart_id+1; #原
update tb_iot set smart_id=@Newsmart_id ,properties=REPLACE(properties,CONCAT('"smartId":"',@Oldsmart_id,'"'),CONCAT('"smartId":"',@Newsmart_id,'"')) where corp_id=115 and pid=@pidPeng and properties like CONCAT('%"smartId":"',@Oldsmart_id,'"%');
set @Newsmart_id=@Newsmart_id+1; #新
set @Oldsmart_id=@Oldsmart_id+1; #原
update tb_iot set smart_id=@Newsmart_id ,properties=REPLACE(properties,CONCAT('"smartId":"',@Oldsmart_id,'"'),CONCAT('"smartId":"',@Newsmart_id,'"')) where corp_id=115 and pid=@pidPeng and properties like CONCAT('%"smartId":"',@Oldsmart_id,'"%');
#1442 電磁閥
#1443 卷被
#1444 土壤溫溼度#3
#1445 放風機
#1446 百葉窗#1
#1447 土壤PH值#1
#1448 土壤溫溼度#1
#1449 百葉窗#2
#1450 土壤溫溼度#2
#1451 百葉窗#3
#1452 土壤PH值#2
#1453 土壤PH值#3
#select * from tb_iot where corp_id=115 and pid=@pidPeng;
