物联网概论-畅读网

　　　　

物联网概论

作者：宗平

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计算机网络 >> 软硬件开发

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内容简介:

物联网是指在物理世界的实体中部署具有一定感知能力、计算能力或执行能力的各种信息传感设备，通过网络设施实现信息传输、协同和处理，从而实现广域或特定范围的人与人、人与物、物与物之间信息交换需求的互联网络。物联网是建立在互联网基础上的，将其用户端延伸和扩展到任何物品与物品之间或人与物品之间，从而进行相互通信与信息交换的一种网络与服务的概念。“Internet of Things”是手段，“Internet of Services”才是目的。

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SHOW FULL COLUMNS FROM `ls_nav` [ RunTime:0.005052s ]
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SELECT `id`,`name` FROM `ls_goods_category` WHERE `id` = 35 LIMIT 1 [ RunTime:0.008217s ]
SELECT `a`.*,`ap`.`width`,`ap`.`height` FROM `ls_ad` `a` INNER JOIN `ls_ad_position` `ap` ON `a`.`pid`=`ap`.`id` WHERE `pid` = 11 AND `ap`.`client` = '2' AND `a`.`status` = '1' AND `a`.`del` = '0' AND `ap`.`status` = '1' AND `ap`.`del` = '0' ORDER BY `sort` DESC,`id` DESC [ RunTime:0.008849s ]
SELECT `a`.*,`ap`.`width`,`ap`.`height` FROM `ls_ad` `a` INNER JOIN `ls_ad_position` `ap` ON `a`.`pid`=`ap`.`id` WHERE `pid` = 14 AND `ap`.`client` = '2' AND `a`.`status` = '1' AND `a`.`del` = '0' AND `ap`.`status` = '1' AND `ap`.`del` = '0' ORDER BY `sort` DESC,`id` DESC [ RunTime:0.013629s ]
SELECT * FROM `ls_goods` WHERE `del` = 0 AND `status` = 1 AND `create_time` <= 1755796698 ORDER BY `create_time` DESC LIMIT 5 [ RunTime:1.541119s ]

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