我的 C# 方法的 SQL 函数或存储过程是什么

What is Equal SQL Function or StoredProcedure for my C# Method

我有这个 C# 方法来确定一个点是否在多边形内

C#方法是这样的:

/// <summary>
/// Determine that a point in inside a polygon or not
/// </summary>
/// <param name="points">Points of Polygon</param>
/// <param name="point">Test Point</param>
/// <returns></returns>    
Public bool IsInside(List<PointF> points,PointF point )
    {
        int i, j,n=points.Count;
        bool c = false;
        for (i = 0, j = n - 1; i < n; j = i++)
        {
            if (((points[i].Y > point.Y) != (points[j].Y > point.Y)) &&
                (point.X <
                 (points[j].X - points[i].X)*(point.Y - points[i].Y)/(points[j].Y - points[i].Y) + points[i].X))
                c = !c;
        }
        return c;
    }

如何将其转换为 SQL 函数或存储过程?

如果您将所有多边形作为空间 geometry 数据类型存储在 SQL 服务器数据库中,则可以使用 SQL Server 2008R2+ 中可用的空间函数,其中有很多(Google 是你的朋友):

declare @g geometry
set @g = geometry::STGeomFromText('POLYGON((-33.229869 -70.891988
                                           ,-33.251124 -70.476616
                                           ,-33.703094 -70.508045
                                           ,-33.693931 -70.891052
                                           ,-33.229869 -70.891988
                                           ))'
                                 ,0)

DECLARE @h geometry;

SET @h = geometry::STGeomFromText('POINT(-33.3906300 -70.5725020)', 0);
SELECT @g.STContains(@h);