Criteria SpatialRestrictions.IsWithinDistance NHibernate.Spatial [英] Criteria SpatialRestrictions.IsWithinDistance NHibernate.Spatial
问题描述
有人执行过此操作,还是知道执行此操作是否困难/有任何指针?
Has anyone implemented this, or know if it would be difficult to implement this/have any pointers?
public static SpatialRelationCriterion IsWithinDistance(string propertyName, object anotherGeometry, double distance)
{
// TODO: Implement
throw new NotImplementedException();
}
来自NHibernate.Spatial.Criterion.SpatialRestrictions
from NHibernate.Spatial.Criterion.SpatialRestrictions
我可以在hql中使用"where NHSP.Distance(PROPERTY,:point)".但是想将此查询与我现有的条件查询结合起来.
I can use "where NHSP.Distance(PROPERTY, :point)" in hql. But want to combine this query with my existing Criteria query.
目前,我正在创建一个粗糙的多边形,并使用
for the moment I'm creating a rough polygon, and using
criteria.Add(SpatialRestrictions.Intersects("PROPERTY", myPolygon));
EDIT 通过在SpatialRelationCriterion上重载构造函数,并添加新的SpatialRelation.Distance
EDIT Got a prototype working by overloading constructor on SpatialRelationCriterion, adding new SpatialRelation.Distance
public static SpatialRelationCriterion IsWithinDistance(string propertyName, object anotherGeometry, double distance)
{
return new SpatialRelationCriterion(propertyName, SpatialRelation.Distance, anotherGeometry, distance);
}
为SpatialRelationCriterion添加了一个新字段
added a new field to SpatialRelationCriterion
private readonly double? distance;
public SpatialRelationCriterion(string propertyName, SpatialRelation relation, object anotherGeometry, double distance)
: this(propertyName, relation, anotherGeometry)
{
this.distance = distance;
}
编辑的ToSqlString
Edited ToSqlString
object secondGeometry = Parameter.Placeholder;
if (!(this.anotherGeometry is IGeometry))
{
secondGeometry = columns2[i];
}
if (distance.HasValue)
{
builder.Add(spatialDialect.GetSpatialRelationString(columns1[i], this.relation, secondGeometry, distance.Value, true));
}
else
{
builder.Add(spatialDialect.GetSpatialRelationString(columns1[i], this.relation, secondGeometry, true));
}
重载了ISpatialDialect.GetSpatialRelationString
overloaded ISpatialDialect.GetSpatialRelationString
在MsSql2008SpatialDialect中实现的重载
implemented overload in MsSql2008SpatialDialect
public SqlString GetSpatialRelationString(object geometry, SpatialRelation relation, object anotherGeometry, double distance, bool criterion)
{
var x = new SqlStringBuilder(8)
.AddObject(geometry)
.Add(".ST")
.Add(relation.ToString())
.Add("(")
.AddObject(anotherGeometry)
.Add(")");
if (criterion)
{
x.Add(" < ");
x.AddObject(distance.ToString());
}
return x.ToSqlString();
}
不确定为什么不使用AddParameter吗?
Not sure why AddParameter not being used?
推荐答案
我们正在GitHub上研究此问题.感谢您提供深刻的见解和可能的解决方案.这是问题的链接: https://github.com/nhibernate/NHibernate.Spatial/Issues/61
we are looking into this issue over at GitHub. Thanks for providing great insight and a possible solution. Here's a link to the issue: https://github.com/nhibernate/NHibernate.Spatial/issues/61
在修复后,我将发布新的NuGet软件包.
I will publish new NuGet packages as soon as this is fixed.
这篇关于Criteria SpatialRestrictions.IsWithinDistance NHibernate.Spatial的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!