如何使用WKT？

Question

我正在做一个数据库赋值(TSQL)，并给了一些“众所周知的文本”来处理。

我把桌子做好了：

drop table geometry_polygons;
go
drop table geometry_points;
go
drop table geometry_linestrings;
go 
create table geometry_polygons(
    id int primary key NOT NULL,
    polygon geometry,
    label varchar(50),
    area decimal(10,4),
);
create table geometry_points(
    id int primary key NOT NULL,
    point geometry,
    label varchar(501),
);
create table geometry_linestrings(
    id int primary key NOT NULL,
    linestring geometry,
    label varchar(50),
    length decimal(10,4),
);

如何将几何点插入表中？

我有这个工作要做；

(POLYGON((175.0305935740471 -39.924665194652604,175.03033608198166 -39.924387504970255,175.0301563739777 -39.92449035313209,175.03041118383408 -39.92474952981466,175.0305935740471 -39.924665194652604)),
POLYGON((175.02037167549133 -39.91957403819063,175.01922369003293 -39.92019116822632,175.02052187919617 -39.921170336469736,175.02149283885956 -39.920446247016564,175.02037167549133 -39.91957403819063)),
LINESTRING(175.03047287464142 -39.92471250463434,175.03052115440366 -39.9247659854439,175.03007590770721 -39.924840035726646,175.02978086471558 -39.92509098331137,175.02977550029755 -39.92522262757816,175.03003299236298 -39.92538306868607,175.03039240837097 -39.92549002921579,175.031116604805 -39.92600426019882,175.0300168991089 -39.92684347686768,175.0209134817123 -39.919899060702676,175.02084910869598 -39.91996488785901),POINT(175.031116604805 -39.92600426019882),POINT(175.0300168991089 -39.92684347686768),POINT(175.02427697181705 -39.92248272908731),
POINT(175.02696990966797 -39.92459731505649),
POINT(175.0277853012085 -39.925181488771976),
POINT(175.02287685871124 -39.92140689812598),
POINT(175.02042531967163 -39.920339278607294),
POINT(175.03031730651853 -39.924552061955026))

Answer 1

就像这样：

declare @g geometry; 
set @g=geometry::STGeomFromText('POLYGON((175.0305935740471 -39.924665194652604,175.03033608198166 -39.924387504970255,175.0301563739777 -39.92449035313209,175.03041118383408 -39.92474952981466,175.0305935740471 -39.924665194652604))', 4326);  
insert into geometry_polygons (polygon) values (@g);

注意，您必须指定一个坐标参考系统，有时称为空间参考系统(SRS)，例如4326，这意味着lat/long，这样许多空间函数才能正常工作。

编辑:您在更新的问题中添加的几何图形是多边形、线串和点的混合物，因此，如果您想一次将它们全部添加，或者将它们分割成单独的条目，则需要使用GeometryCollection (可以采用混合类型)。但是，将不同的几何类型混合在一起通常是个坏主意，因为许多空间函数在GeometryCollections上不起作用。

Answer 2

您可以使用STGeomFromText方法http://msdn.microsoft.com/en-us/library/bb933823.aspx将WKT转换为Server几何

由于您的下一个问题可能是“那么SRID的内容是什么”，下面是相关的问题Geometry column: STGeomFromText and SRID (what is an SRID?)