AutoCAD Map 3D toolset supports SQL Server Spatial.
To bring in features from SQL Server Spatial
The service name is set when you install SQL Server Spatial itself.
To select from a list of data stores, click the down arrow. AutoCAD Map 3D toolset connects to the specified server and instance and lists the available data stores.
If this feature source contains only a single feature class, that feature class is selected automatically. If it contains multiple feature classes, you can do either of the following:
If a feature class contains multiple geometry types,and you select the feature class itself, all geometries are added. To add a subset of geometries, hold your cursor over the feature class name to see the Show Geometry button. Click Show Geometry to see each geometry as a separate choice. Select the ones you want. Each selected geometry is added to map as a separate Display Manager layer.