st_2dcontains|st_3dcontains|st_2dtcontains|st_3dtcontains|st_2dcontains|st_3dcontains|st_2dtcontains|st_3dtcontains|st_2dcontains|st_3dcontains|st_2dtcontains|st_3dtcontains-+-+-+-+-+-+-+-+-+-+-+-t|t|t|t|t|t|f|f|f|f|f|f
本文介绍使用 云消息队列 MQTT 版 进行消息收发时的常见问题。为什么会出现一条消息同一时间重试多次？为什么消息会一直重试？消息发送时提示GroupID没有权限 使用RocketMQ数据流入MQTT功能时，为什么子级Topic后会多了一个“/”?消息发送...
st_2dcontains|st_3dcontains|st_2dtcontains|st_3dtcontains|st_2dcontains|st_3dcontains|st_2dtcontains|st_3dtcontains|st_2dcontains|st_3dcontains|st_2dtcontains|st_3dtcontains-+-+-+-+-+-+-+-+-+-+-+-t|t|t|t|t|t|f|f|f|f|f|f
可选择查询登录日志、邮件收发日志和操作日志，最多可显示200条近30天内的日志。操作步骤 登录 阿里邮箱网页端，单击右上角的 设置 图标。在 设置 页面，查询登录日志、邮件收发日志和操作日志。登录日志：包括登录时间、登录城市、登录IP...
st_2dcontains|st_3dcontains|st_2dtcontains|st_3dtcontains|st_2dcontains|st_3dcontains|st_2dtcontains|st_3dtcontains|st_2dcontains|st_3dcontains|st_2dtcontains|st_3dtcontains-+-+-+-+-+-+-+-+-+-+-+-t|t|t|t|t|t|f|f|f|f|f|f
st_2dcontains|st_3dcontains|st_2dtcontains|st_3dtcontains|st_2dcontains|st_3dcontains|st_2dtcontains|st_3dtcontains|st_2dcontains|st_3dcontains|st_2dtcontains|st_3dtcontains-+-+-+-+-+-+-+-+-+-+-+-t|t|t|t|t|t|f|f|f|f|f|f
本文介绍使用 云消息队列 MQTT 版 进行消息收发时的常见问题。为什么会出现一条消息同一时间重试多次？为什么消息会一直重试？消息发送时提示GroupID没有权限 使用RocketMQ数据流入MQTT功能时，为什么子级Topic后会多了一个“/”?消息发送...
st_isring|st_isclosed|st_issimple-+-+-t|t|t(1 row)返回false的情况：SELECT ST_IsRing(geom),ST_IsClosed(geom),ST_IsSimple(geom)FROM(SELECT 'LINESTRING(0 0,0 2,0 0)':geometry AS geom)AS test;st_isring|st_isclosed|st_issimple-...
本文介绍物联网平台设备消息收发原理、实现方案及相关消息Topic说明。
This topic describes the ST_Collect function.This function returns a geometry object that represents the collection of input geometry objects.Syntax geometry ST_Collect(geometry set g1Field);geometry ST_Collect(geometry g1...
本视频通过实战教学，从企业实例购买、设备接入、设备消息收发以及云端开发四个部分，端到端地指导您将设备接入阿里云物联网平台以及进行消息收发。
This topic describes the ST_Collect function.This function returns a geometry object that represents the collection of input geometry objects.Syntax geometry ST_Collect(geometry set g1Field);geometry ST_Collect(geometry g1...
This topic describes the ST_Collect function.This function returns a geometry object that represents the collection of input geometry objects.Syntax geometry ST_Collect(geometry set g1Field);geometry ST_Collect(geometry g1...
This topic describes the ST_MakePoint function.This function constructs a 2D,3DZ,or 4D point object.Syntax geometry ST_MakePoint(double precision x,double precision y);geometry ST_MakePoint(double precision x,double ...
This topic describes the ST_IsRing function.This function returns true if the results of both the ST_IsClosed function and the ST_IsSimple function for the input geometry object are true.Syntax boolean ST_IsRing(geometry g...
从Point、MultiPoint或者Line等...st_astext-LINESTRING Z(1 2 3,4 5 6)(1 row)通过数组构建：SELECT ST_AsText(ST_MakeLine(ARRAY[ST_MakePoint(1,2),ST_MakePoint(3,4),ST_MakePoint(5,6)]));st_astext-LINESTRING(1 2,3 4,5 6)(1 row)
This topic describes the ST_Contains function,which queries whether a grid contains a geometry.Syntax boolean ST_Contains(geomgrid grid,geometry geom);boolean ST_Contains(geometry geom,geomgrid grid);boolean ST_Contains...
This topic describes the ST_Contains function,which queries whether a grid contains a geometry.Syntax boolean ST_Contains(geomgrid grid,geometry geom);boolean ST_Contains(geometry geom,geomgrid grid);boolean ST_Contains...
This topic describes the ST_MakePoint function.This function constructs a 2D,3DZ,or 4D point object.Syntax geometry ST_MakePoint(double precision x,double precision y);geometry ST_MakePoint(double precision x,double ...
Trajectory SQL Fixed a spelling error in the protobuf definition of the ST_AsProtobuf and ST_TrajFromProtobuf functions.FiledType is corrected to FieldType.GeomGrid SQL The level parameter in the ST_As3DGrid,ST_AsText,ST_...
从Point、MultiPoint或者Line等...st_astext-LINESTRING Z(1 2 3,4 5 6)(1 row)通过数组构建：SELECT ST_AsText(ST_MakeLine(ARRAY[ST_MakePoint(1,2),ST_MakePoint(3,4),ST_MakePoint(5,6)]));st_astext-LINESTRING(1 2,3 4,5 6)(1 row)
从Point、MultiPoint或者Line等...st_astext-LINESTRING Z(1 2 3,4 5 6)(1 row)通过数组构建：SELECT ST_AsText(ST_MakeLine(ARRAY[ST_MakePoint(1,2),ST_MakePoint(3,4),ST_MakePoint(5,6)]));st_astext-LINESTRING(1 2,3 4,5 6)(1 row)
This topic describes the ST_Union function.This function constructs a geometry object that represents the union of multiple specified geometry objects.Syntax geometry ST_Union(geometry set g1Field);geometry ST_Union...
This topic describes the ST_Contains function,which queries whether a grid contains a geometry.Syntax boolean ST_Contains(geomgrid grid,geometry geom);boolean ST_Contains(geometry geom,geomgrid grid);boolean ST_Contains...
This topic describes the ST_Union function.This function constructs a geometry object that represents the union of multiple specified geometry objects.Syntax geometry ST_Union(geometry set g1Field);geometry ST_Union...
b,ST_PGEpochToTS(0),ST_PGEpochToTS(49),19),ST_2dtDWithin(a,b,ST_PGEpochToTS(0),ST_PGEpochToTS(50),20),ST_3dtDWithin(a,b,ST_PGEpochToTS(0),ST_PGEpochToTS(50),20),ST_2dtDWithin(a,b,ST_PGEpochToTS(0),ST_PGEpochToTS(70),21),ST...
This topic describes the ST_IsRing function.This function returns true if the results of both the ST_IsClosed function and the ST_IsSimple function for the input geometry object are true.Syntax boolean ST_IsRing(geometry g...
The following result is returned:st_astext-POINT(116 39)Statement in which the SRID is specified SELECT st_astext(geom)FROM holo_gis_2 WHERE ST_Covers(ST_SetSRID(ST_MakeBox2D(ST_Point(116,39),ST_Point(117,40)),4326),geom);...
在运行收发消息的 Java 代码前，您需按照本文提供的步骤来准备环境。操作步骤 通过 Maven 方式引入依赖。Java SDK 的最新版本号，可参见 SDK 版本说明。dependency groupId ...