SQL Server Types

Demis Bellot edited this page Feb 26, 2018 · 7 revisions

OrmLite can be extended to support new Types using SQL Server Special Type Converters which currently adds support for the SQL Server-specific SqlGeography, SqlGeometry and SqlHierarchyId Types.

Since these Types require an external dependency to the Microsoft.SqlServer.Types NuGet package they're contained in a separate NuGet package that can be installed with:

PM> Install-Package ServiceStack.OrmLite.SqlServer.Converters

Once installed, all available SQL Server Types can be registered on your SQL Server Provider with:


SqlServer 2012 Connection String

In addition to using SqlServer2012Dialect.Provider you'll also need to specify you're using MSSQL 2012 on the connection string by adding the ;Type System Version=SQL Server 2012; suffix, e.g:

var dbFactory = new OrmLiteConnectionFactory(
  "Server=host;Database=db;User Id=sa;Password=test;Type System Version=SQL Server 2012",

var db = dbFactory.OpenDbConnection();

Example Usage

After the Converters are registered they can treated like a normal .NET Type, e.g:

SqlHierarchyId Example:

public class Node {
    public long Id { get; set; }
    public SqlHierarchyId TreeId { get; set; }


var treeId = SqlHierarchyId.Parse("/1/1/3/"); // 0x5ADE is hex
db.Insert(new Node { TreeId = treeId });

var parent = db.Scalar<SqlHierarchyId>(
parent.ToString().Print(); //= /1/1/

SqlGeography and SqlGeometry Example:

public class GeoTest {
    public long Id { get; set; }
    public SqlGeography Location { get; set; }
    public SqlGeometry Shape { get; set; }


var geo = SqlGeography.Point(40.6898329,-74.0452177, 4326); // Statue of Liberty

// A simple line from (0,0) to (4,4)  Length = SQRT(2 * 4^2)
var wkt = new System.Data.SqlTypes.SqlChars("LINESTRING(0 0,4 4)".ToCharArray());
var shape = SqlGeometry.STLineFromText(wkt, 0);

db.Insert(new GeoTestTable { Id = 1, Location = geo, Shape = shape });
var dbShape = db.SingleById<GeoTest>(1).Shape;

new { dbShape.STEndPoint().STX, dbShape.STEndPoint().STY }.PrintDump();


    STX: 4,
    STY: 4

Memory Optimized Tables

OrmLite allows access to many other advanced SQL Server features including Memory-Optimized Tables where you can tell SQL Server to maintain specific tables in Memory using the [SqlServerMemoryOptimized] attribute, e.g:

public class SqlServerMemoryOptimizedCacheEntry : ICacheEntry
    public string Id { get; set; }
    public string Data { get; set; }
    public DateTime CreatedDate { get; set; }
    public DateTime? ExpiryDate { get; set; }
    public DateTime ModifiedDate { get; set; }

The [SqlServerBucketCount] attribute can be used to configure the bucket count for a hash index whilst the new [SqlServerCollate] attribute can be used to specify an SQL Server collation.

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