用Dapper映射SqlGeography [英] Mapping SqlGeography with Dapper

问题描述

我有一个实体"Point"，其中包含ID，文本和地理坐标.

I have entity "Point", that contains Id, Text and geography coordinates.

CREATE TABLE [Point] (
    [Id] INT IDENTITY CONSTRAINT [PK_Point_Id] PRIMARY KEY,
    [Coords] GEOGRAPHY NOT NULL,
    [Text] NVARCHAR(32) NOT NULL,
    [CreationDate] DATETIME NOT NULL,
    [IsDeleted] BIT NOT NULL DEFAULT(0)
)

CREATE PROCEDURE [InsertPoint]
    @text NVARCHAR(MAX),
    @coords GEOGRAPHY
AS BEGIN
    INSERT INTO [Point](Text, Coords, CreationDate)
    VALUES(@text, @coords, GETUTCDATE())    
    SELECT * FROM [Point] WHERE [Id] = SCOPE_IDENTITY()
END

这是表的sql代码和插入的存储过程.我有使用dapper的课程:

This is ts sql code of table and stored procedure of inserting. I have class for using dapper :

public class DapperRequester : IDisposable {
    private readonly SqlConnection _connection;
    private SqlTransaction _transaction;

    public DapperRequester(string connectionString) {
        _connection = new SqlConnection(connectionString);
        _connection.Open();
    }
    public void Dispose() {
        _connection.Close();
    }

    public void BeginTransaction() {
        _transaction = _connection.BeginTransaction();
    }
    public void CommitTransaction() {
        _transaction.Commit();
    }
    public void RollbackTransaction() {
        _transaction.Rollback();
    }

    public void Query(string query, object parameters = null) {
        Dapper.SqlMapper.Execute(_connection, query, parameters, transaction: _transaction);
    }

    public void QueryProc(string procName, object parameters = null) {
        Dapper.SqlMapper.Execute(_connection, procName, parameters, commandType: CommandType.StoredProcedure, transaction: _transaction);
    }

    public IEnumerable<T> Execute<T>(string query, object parameters = null) {
        return Dapper.SqlMapper.Query<T>(_connection, query, parameters, transaction: _transaction);
    }

    public IEnumerable<dynamic> ExecuteProc(string procName, object parameters = null) {
        return Dapper.SqlMapper.Query(_connection, procName, parameters,
                                         commandType: CommandType.StoredProcedure, transaction: _transaction);
    }

    public IEnumerable<T> ExecuteProc<T>(string procName, object parameters = null) {
        return Dapper.SqlMapper.Query<T>(_connection, procName, parameters,
                                         commandType: CommandType.StoredProcedure, transaction: _transaction);
    }
}

c#-class是:

c#-class is :

public class Point
{
    public int Id { get; set; }
    public SqlGeography Coords { get; set; }
    public string Text { get; set; }
}

存储库具有方法

public Point InsertPoint(string text, SqlGeography coords)
    {
        using (var requester = GetRequester())
        {
            return requester.ExecuteProc<Point>("InsertPoint", new { text, coords }).FirstOrDefault();
        }
    }

当我将此类系统用于其他任何类时，一切都很好，但是映射存在问题，我认为是由于SqlGeography类型..使用:

When I use such system for any other class, everything is okey, but there is a problem with mapping, I think it is because of SqlGeography type.. Using :

SqlGeography coords = new SqlGeography();
        coords = SqlGeography.Point(10.5, 15.5, 4326);
        Point point = new Point { Coords = coords, Text = "Text" };
        point = Repositories.PointRepository.InsertPoint(point.Text, point.Coords);

我有一个例外The member coords of type Microsoft.SqlServer.Types.SqlGeography cannot be used as a parameter value

映射该类型是否有秘密?

Is there some secret of mapping that type?

推荐答案

Dapper 1.32现在

Dapper 1.32 now includes direct support for this. Your code should now simply work.

这篇关于用Dapper映射SqlGeography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！