1.定义用户变量(或者赋值)
set @变量名=值
-- 创建自定义用户变量，当当前的用断开连接的时候就会消失
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,'%');应用范例：复制一个大棚后，增加修改数据。
#复制大棚#2，改下面的参数。
#1更新网关ID 更新一个棚所有网关
set @name='大棚#6';
set @pidPeng=1627; #大棚id 下的所有
set @pidAllSmart=1628; #所有智能设备 下的所有
set @NewgatewayId=20190027;
#以上参数要改
set @OldgatewayId=20190020; #原 复制大棚#2的数据
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 #所有智能设备
#2更新传感器的smartid
#set @pidPeng=1539; #大棚id 下的所有 同上
set @Newsmart_id=1629; #新电磁阀
#以上参数要改
set @Oldsmart_id=1442; #原电磁阀 复制大棚#2的数据
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 土壤温湿度#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 电磁阀
#1443 卷被
#1444 土壤温湿度#3
#1445 放风机
#1446 百叶窗#1
#1447 土壤PH值#1
#1448 土壤温湿度#1
#1449 百叶窗#2
#1450 土壤温湿度#2
#1451 百叶窗#3
#1452 土壤PH值#2
#1453 土壤PH值#3
#select * from tb_iot where corp_id=115 and pid=@pidPeng; 