Map CLR and other non-primitive SQL Server types to string in schema inference

CHANGELOG.md

@@ -2,6 +2,9 @@
 
 Represents the **NuGet** versions.
 
+## v3.2.1
+- *Fixed:* SQL Server schema inference no longer throws `Database data type 'x' does not have corresponding .NET type mapping defined` for `geography`, `geometry`, `hierarchyid`, `xml` and `vector` columns; they map to `string`. Previously a single column of one of these types in any table failed the `Data`, `Reset` and `Inspect` commands for the whole database.
+
 ## v3.2.0
 - *Enhancement:* The `MigrationCommand.Execute` has been enhanced to support the execution of YAML/JSON data files. Raw SQL must _now_ be prefixed by `>` to explicitly differentiate from a file path.
 - *Enhancement:* The `MigrationCommand.Inspect` has been enhanced to also report whether each column has been identified as a JSON column (i.e. `DbColumnSchema.IsJson`).

src/DbEx.SqlServer/SqlServerSchemaConfig.cs

@@ -212,6 +212,10 @@ public override string ToDotNetTypeName(DbColumnSchema schema)
             "TINYINT" => "byte",
             "REAL" => "float",
             "UNIQUEIDENTIFIER" => "Guid",
+            // CLR and other non-primitive types surface as their string representation (WKT, path, XML, JSON array);
+            // SQL Server converts the string implicitly on insert. Without a mapping, a single column of one of
+            // these types in any table would fail the whole schema inference (Data, Reset and Inspect).
+            "GEOGRAPHY" or "GEOMETRY" or "HIERARCHYID" or "XML" or "VECTOR" => "string",
             _ => throw new InvalidOperationException($"Database data type '{dbType}' does not have corresponding .NET type mapping defined."),
         };
     }

tests/DbEx.Test.Console/Migrations/009-create-test-clrtypes-table.sql

@@ -0,0 +1,13 @@
+-- Create table: [Test].[ClrTypes]
+
+BEGIN TRANSACTION
+
+CREATE TABLE [Test].[ClrTypes] (
+  [ClrTypesId] INT NOT NULL PRIMARY KEY,
+  [Location] GEOGRAPHY NULL,
+  [Shape] GEOMETRY NULL,
+  [Path] HIERARCHYID NULL,
+  [Document] XML NULL
+)
+
+COMMIT TRANSACTION

tests/DbEx.Test/DatabaseSchemaTest.cs

@@ -354,6 +354,31 @@ public async Task SqlServerSelectSchema()
             Assert.IsNull(col.ForeignTable);
             Assert.IsNull(col.ForeignColumn);
             Assert.IsNotNull(col.DefaultValue);
+
+            // [Test].[ClrTypes] - CLR and other non-primitive types map to string.
+            tab = tables.Where(x => x.Name == "ClrTypes").SingleOrDefault();
+            Assert.IsNotNull(tab);
+            Assert.AreEqual(5, tab.Columns.Count);
+
+            col = tab.Columns[1];
+            Assert.AreEqual("Location", col.Name);
+            Assert.AreEqual("geography", col.Type);
+            Assert.AreEqual("string", col.DotNetType);
+
+            col = tab.Columns[2];
+            Assert.AreEqual("Shape", col.Name);
+            Assert.AreEqual("geometry", col.Type);
+            Assert.AreEqual("string", col.DotNetType);
+
+            col = tab.Columns[3];
+            Assert.AreEqual("Path", col.Name);
+            Assert.AreEqual("hierarchyid", col.Type);
+            Assert.AreEqual("string", col.DotNetType);
+
+            col = tab.Columns[4];
+            Assert.AreEqual("Document", col.Name);
+            Assert.AreEqual("xml", col.Type);
+            Assert.AreEqual("string", col.DotNetType);
         }
 
         [Test]