How to use WKT?
我正在做一个数据库分配 (TSQL),并且已经获得了一些"众所周知的文本"可以使用。
我已经制作了表格:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | 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格中?
我有这个工作;
1 2 3 4 5 6 7 8 | (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)) |
您可以使用
由于您的下一个问题可能是"什么是 SRID 东西,那么",这里有相关的 SO 问题 Geometry 专栏:STGeomFromText 和 SRID(什么是 SRID?)
类似这样的:
1 2 3 | 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); |
请注意,您必须指定坐标参考系统,有时称为空间参考系统 (SRS),例如 4326,表示纬度/经度,才能使许多空间功能正常工作。
编辑:您在更新后的问题中添加的几何图形是多边形、线串和点的混合体,因此,如果您想添加它们,您需要使用 GeometryCollection(可以采用多种类型)一口气,或将它们拆分为单独的条目。但是,像这样混合不同的几何类型通常是个坏主意,因为许多空间函数不适用于 GeometryCollections。