c# – 批量插入具有地理空间数据类型的表时出现“未注册指定类型”错误

2019年7月21日 174次阅读

我正在尝试使用System.Data程序集(4.6.1)中的SqlBulkCopy类来批量插入具有地理空间数据类型的表,使用看起来大致相似的代码(从
https://github.com/MikaelEliasson/EntityFramework.Utilities改编)：

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();
        }
    }
}

这很有效,直到我尝试在具有地理空间数据的表上使用它.当我这样做时,我收到以下错误：

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,没有多大用处.我已经跟踪了调用链,深入到了SqlBulkCopy程序集的内容中(谢谢,Resharper！),但错误似乎隐藏得比我能挖掘的更深.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/),但没有骰子.

有什么建议？

最佳答案 好的,我想我已经修好了.有问题的代码在EFDataReader< T>中.上课(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);
}

但这意味着它返回了任何与db不相关的DbGeometry和DbGeography值,这些值恰好是DbGeometry和DbGeography,而SqlBulkCopy类并不理解.它们实际上需要特定于SQL Server,即SqlGeography和SqlGeometry,如下所示：

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;
}
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