dev-npgsql/npgsql: Npgsql is the .NET data provider for PostgreSQL.

src/Npgsql.LegacyPostgis/NpgsqlLegacyPostgisExtensions.cs
75 строк3 KB
Shay Rojansky
Add geography support to Npgsql.LegacyPostgis
15 май 2018, 14:29
15 май 2018, 14:296ac7919
#region License
// The PostgreSQL License
//
// Copyright (C) 2018 The Npgsql Development Team
//
// Permission to use, copy, modify, and distribute this software and its
// documentation for any purpose, without fee, and without a written
// agreement is hereby granted, provided that the above copyright notice
// and this paragraph and the following two paragraphs appear in all copies.
//
// IN NO EVENT SHALL THE NPGSQL DEVELOPMENT TEAM BE LIABLE TO ANY PARTY
// FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
// INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
// DOCUMENTATION, EVEN IF THE NPGSQL DEVELOPMENT TEAM HAS BEEN ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
//
// THE NPGSQL DEVELOPMENT TEAM SPECIFICALLY DISCLAIMS ANY WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
// ON AN "AS IS" BASIS, AND THE NPGSQL DEVELOPMENT TEAM HAS NO OBLIGATIONS
// TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
#endregion

using System;
using System.Data;
using Npgsql.LegacyPostgis;
using Npgsql.TypeMapping;
using NpgsqlTypes;

// ReSharper disable once CheckNamespace
namespace Npgsql
{
    /// <summary>
    /// Extension adding the legacy PostGIS types to an Npgsql type mapper.
    /// </summary>
    public static class NpgsqlLegacyPostgisExtensions
    {
        /// <summary>
        /// Sets up the legacy PostGIS types to an Npgsql type mapper.
        /// </summary>
        /// <param name="mapper">The type mapper to set up (global or connection-specific)</param>
        public static INpgsqlTypeMapper UseLegacyPostgis(this INpgsqlTypeMapper mapper)
        {
            var typeHandlerFactory = new LegacyPostgisHandlerFactory();

            return mapper
                .AddMapping(new NpgsqlTypeMappingBuilder
                {
                    PgTypeName = "geometry",
                    NpgsqlDbType = NpgsqlDbType.Geometry,
                    ClrTypes = new[]
                    {
                        typeof(PostgisGeometry),
                        typeof(PostgisPoint),
                        typeof(PostgisMultiPoint),
                        typeof(PostgisLineString),
                        typeof(PostgisMultiLineString),
                        typeof(PostgisPolygon),
                        typeof(PostgisMultiPolygon),
                        typeof(PostgisGeometryCollection),
                    },
                    TypeHandlerFactory = typeHandlerFactory
                }.Build())
                .AddMapping(new NpgsqlTypeMappingBuilder
                {
                    PgTypeName = "geography",
                    NpgsqlDbType = NpgsqlDbType.Geography,
                    DbTypes = new DbType[0],
                    ClrTypes = new Type[0],
                    InferredDbType = DbType.Object,
                    TypeHandlerFactory = typeHandlerFactory
                }.Build());
        }
    }
}