Question

我试图通过使用DBSet.FromSQL方法来解决实体框架核心不支持空间类型这一事实，并手动滚动迁移以在SQL Server上添加地理列。

这是我的DataContext

public interface IDataContext
{
    DbSet<PointOfInterest> PointsOfInterest { get; set; }
    int SaveChanges();
    Task<int> SaveChangesAsync(CancellationToken cancellationToken);
}

public class DataContext : DbContext, IDataContext
{
    public DataContext(DbContextOptions options) : base(options)
    {

    }

    public DbSet<PointOfInterest> PointsOfInterest { get; set; }

}

PointOfInterest模型

using System;

namespace EfSpatialSample.Models
{
    public class PointOfInterest
    {
        public Guid Id { get; set; }
        public double Latitude { get; set; }
        public double Longitude { get; set; }
        public DateTime DateAdded { get; set; }
    }
}

迁移以添加地理类型

    using Microsoft.EntityFrameworkCore.Migrations;

namespace EfSpatialSample.Migrations
{
    public partial class InitialModel : Migration
    {
        protected override void Up(MigrationBuilder migrationBuilder)
        {


            migrationBuilder.Sql($"CREATE TABLE [dbo].[PointsOfInterest]" +
"(" +
" [Id] [uniqueidentifier]  NOT NULL DEFAULT NEWSEQUENTIALID(), " +
"[DateAdded] [datetime2](7)  NOT NULL," +
"[Latitude] [float]  NOT NULL,  " +
"[Longitude] [float]  NOT NULL, " +
"[Location] [geography] NOT NULL " +
") " +
"ALTER TABLE [dbo].[PointsOfInterest] ADD CONSTRAINT PK_PointsOfInterest PRIMARY KEY  ([Id])"
+ "CREATE SPATIAL INDEX SIndx_PointsOfInterest_geography_Location ON PointsOfInterest(Location); "
);


        }

        protected override void Down(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.DropTable(
                name: "PointsOfInterest");
        }
    }
}

这是查询

using System.Collections.Generic;
using System.Globalization;
using System.Threading.Tasks;
using EfSpatialSample.Models;
using Microsoft.EntityFrameworkCore;

namespace EfSpatialSample.Queries
{
    public class GetPointsOfInterest
    {
        private IDataContext context;

        public GetPointsOfInterest(IDataContext context)
        {
            this.context = context;

        }
        public async Task<List<PointOfInterest>> Execute(double latitude, double longitude, int radius)
        {       
            return await this.context.PointsOfInterest.FromSql("SELECT Id, DateAdded, Latitude, Longitude " +
                     "FROM dbo.PointsOfInterest WHERE GEOGRAPHY::STGeomFromText('POINT({0} {1})', 4326).STDistance(Location) <= {2};"
                     , longitude.ToString(CultureInfo.InvariantCulture)
                     , latitude.ToString(CultureInfo.InvariantCulture)
                     , radius.ToString(CultureInfo.InvariantCulture)).ToListAsync();
        }
    }
}

从控制器调用

[HttpGet]
    public async Task<IEnumerable<PointOfInterest>> Get()
    {
        var query = new GetPointsOfInterest(this.context);

        return await query.Execute(0,0, 1000000);
    }

错误的堆栈跟踪是

    fail: Microsoft.AspNetCore.Server.Kestrel[13]
      Connection id "0HL0JK1F6G9EP": An unhandled exception was thrown by the application.
System.Data.SqlClient.SqlException: A .NET Framework error occurred during execution of user-defined routine or aggregate "geography
":
System.FormatException: 24141: A number is expected at position 9 of the input. The input has @p0.
System.FormatException:
   at Microsoft.SqlServer.Types.WellKnownTextReader.RecognizeDouble()
   at Microsoft.SqlServer.Types.WellKnownTextReader.ParsePointText(Boolean parseParentheses)
   at Microsoft.SqlServer.Types.WellKnownTextReader.ParseTaggedText(OpenGisType type)
   at Microsoft.SqlServer.Types.WellKnownTextReader.Read(OpenGisType type, Int32 srid)
   at Microsoft.SqlServer.Types.SqlGeography.GeographyFromText(OpenGisType type, SqlChars taggedText, Int32 srid)
.
   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boole
an asyncClose)
   at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpl
eResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
   at System.Data.SqlClient.SqlDataReader.TryHasMoreRows(Boolean& moreRows)
   at System.Data.SqlClient.SqlDataReader.TryReadInternal(Boolean setTimeout, Boolean& more)
   at System.Data.SqlClient.SqlDataReader.<>c__DisplayClass184_0.<ReadAsync>b__1(Task t)
   at System.Data.SqlClient.SqlDataReader.InvokeRetryable[T](Func`2 moreFunc, TaskCompletionSource`1 source, IDisposable objectToDis
pose)

如果我将查询参数硬编码到查询字符串中，则查询成功完成，因此查询params对象似乎存在问题。

Answer 1

我能让这个工作的唯一方法是不使用WKT方法

即：GEOGRAPHY::STGeomFromText()而不是public async Task<List<PointOfInterest>> Execute(double latitude, double longitude, int radius) { return await this.context.PointsOfInterest.FromSql( "SELECT Id, DateAdded, Latitude, Longitude " + "FROM dbo.PointsOfInterest " + "WHERE geography::Point(@p0, @p1, 4326).STDistance(Location) <= @p2", longitude, latitude, radius).ToListAsync(); }

FromSql

此外，\b(?:Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\s+(?:0?[1-9]|[12][0-9]|3[01])\s+\d{4}\b似乎不支持命名参数，因此您需要使用@ p0，@ p1等。

Efcore Spatial Query：输入的第9位需要一个数字。输入有@ p0。 -

1 个答案: