c# - 批量插入具有地理空间数据类型的表时出现 "Specified type is not registered"错误

Question

我正在尝试使用 System.Data 程序集 (4.6.1) 中的 SqlBulkCopy 类批量插入具有地理空间数据类型的表，使用代码看起来大致像这样(改编自 https://github.com/MikaelEliasson/EntityFramework.Utilities ):

public void InsertItems<T>(IEnumerable<T> items, string schema, string tableName, IList<ColumnMapping> properties, DbConnection storeConnection, int? batchSize)
{
    using (var reader = new EFDataReader<T>(items, properties))
    {
        var con = (SqlConnection)storeConnection;
        if (con.State != ConnectionState.Open)
        {
            con.Open();
        }
        using (var copy = new SqlBulkCopy(con))
        {
            copy.BatchSize = batchSize ?? 15000; //default batch size
            if (!string.IsNullOrWhiteSpace(schema))
            {
                copy.DestinationTableName = $"[{schema}].[{tableName}]";
            }
            else
            {
                copy.DestinationTableName = "[" + tableName + "]";
            }

            copy.NotifyAfter = 0;

            foreach (var i in Enumerable.Range(0, reader.FieldCount))
            {
                copy.ColumnMappings.Add(i, properties[i].NameInDatabase);
            }
            copy.WriteToServer(reader); // <-- throws here
            copy.Close();
        }
    }
}

效果很好，直到我尝试在包含地理空间数据的表格上使用它。当我这样做时，出现以下错误:

ERROR Swyfft.Console.TaskManager - Error running task SeedRating: 
(InvalidOperationException) The given value of type DbGeography from the data source cannot be converted to type udt of the specified target column.;   
(ArgumentException) Specified type is not registered on the target server.System.Data.Entity.Spatial.DbGeography, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089.;
   at Swyfft.Data.Utilities.SqlQueryProvider.InsertItems[T](IEnumerable`1 items, String schema, String tableName, IList`1 properties, DbConnection storeConnection, Nullable`1 batchSize) in C:\source\swyfft\swyf-website\Swyfft.Data.Utilities\SqlQueryProvider.cs:line 78
   at Swyfft.Data.Utilities.EFBatchOperation`2.InsertAll[TEntity](IEnumerable`1 items, DbConnection connection, Nullable`1 batchSize) in C:\source\swyfft\swyf-website\Swyfft.Data.Utilities\EFBatchOperation.cs:line 138
   at Swyfft.Data.Rating.RatingContext.BulkInsert[T](IEnumerable`1 entities, Nullable`1 batchSize) in C:\source\swyfft\swyf-website\Swyfft.Data.Rating\RatingContext.cs:line 69
   at Swyfft.Seeding.CsvLoaders.CsvLoader.ProcessCsv[T](StreamReader streamReader, String fileName, ISwyfftContext ctx, Func`2 parserFunc) in C:\source\swyfft\swyf-website\Swyfft.Seeding\CsvLoaders\CsvLoader.cs:line 133
   at Swyfft.Seeding.CsvLoaders.CsvLoader.InitializeCountyBlockQualities(String stateFilter) in C:\source\swyfft\swyf-website\Swyfft.Seeding\CsvLoaders\InitializeCountyBlockQualities.cs:line 35

我用 Google 搜索了一下，没有太大用处。我已经追踪到调用链，深入到 SqlBulkCopy 程序集的内部(感谢 Resharper!)，但错误似乎隐藏得比我能够挖掘的更深。我已经尝试安装(并加载)适当的 SQL Server 类型包 ( https://www.nuget.org/packages/Microsoft.SqlServer.Types/ )，但没有成功。

有什么建议吗？

Answer 1

好的，我想我已经修好了。有问题的代码在 EFDataReader<T> 中类(我从 https://github.com/MikaelEliasson/EntityFramework.Utilities/blob/master/EntityFramework.Utilities/EntityFramework.Utilities/EFDataReader.cs 借来的)。它的GetValue(int ordinal)最初看起来像这样:

public override object GetValue(int ordinal)
{
    return Accessors[ordinal](Enumerator.Current);
}

但这意味着它返回任何与数据库无关的 DbGeometry和 DbGeography恰好通过 DbGeometry 获得的值和 DbGeography ，SqlBulkCopy 类不理解。它们实际上需要特定于 SQL-Server，即 SqlGeography和 SqlGeometry ，像这样:

public override object GetValue(int ordinal)
{
    object value = Accessors[ordinal](Enumerator.Current);

    var dbgeo = value as DbGeography;
    if (dbgeo != null)
    {
        var chars = new SqlChars(dbgeo.WellKnownValue.WellKnownText);
        return SqlGeography.STGeomFromText(chars, dbgeo.CoordinateSystemId);
    }

    var dbgeom = value as DbGeometry;
    if (dbgeom != null)
    {
        var chars = new SqlChars(dbgeom.WellKnownValue.WellKnownText);
        return SqlGeometry.STGeomFromText(chars, dbgeom.CoordinateSystemId);
    }

    return value;
}