fix: enable autocommit for MSSQL connections

Author: Maxteabag

sqlit/domains/connections/providers/mssql/adapter.py

@@ -180,7 +180,10 @@ def connect(self, config: ConnectionConfig) -> Any:
         )
 
         conn_str = self._build_connection_string(config)
-        return mssql_python.connect(conn_str)
+        conn = mssql_python.connect(conn_str)
+        # Enable autocommit to allow DDL statements like CREATE DATABASE
+        conn.autocommit = True
+        return conn
 
     def get_databases(self, conn: Any) -> list[str]:
         """Get list of databases from SQL Server."""

tests/unit/test_mssql_autocommit.py

@@ -0,0 +1,58 @@
+"""Unit tests for MSSQL autocommit behavior.
+
+Regression test for GitHub issue #107:
+CREATE DATABASE was failing with "CREATE DATABASE statement not allowed within
+multi-statement transaction" because the MSSQL adapter didn't set autocommit=True.
+"""
+
+from __future__ import annotations
+
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+
+class TestMSSQLAutocommitBehavior:
+    """Test that MSSQL adapter sets autocommit correctly."""
+
+    @pytest.fixture
+    def mock_mssql_python(self):
+        """Create a mock mssql_python module."""
+        mock_module = MagicMock()
+        mock_conn = MagicMock()
+        mock_conn.autocommit = False  # Default behavior
+        mock_module.connect.return_value = mock_conn
+        with patch.dict("sys.modules", {"mssql_python": mock_module}):
+            yield mock_module, mock_conn
+
+    def test_mssql_adapter_sets_autocommit(self, mock_mssql_python):
+        """Regression test: MSSQL adapter must set autocommit=True.
+
+        This prevents 'CREATE DATABASE statement not allowed within
+        multi-statement transaction' errors (GitHub issue #107).
+        """
+        from sqlit.domains.connections.domain.config import ConnectionConfig, TcpEndpoint
+        from sqlit.domains.connections.providers.mssql.adapter import SQLServerAdapter
+
+        _, mock_conn = mock_mssql_python
+
+        adapter = SQLServerAdapter()
+        config = ConnectionConfig(
+            name="test_mssql",
+            db_type="mssql",
+            endpoint=TcpEndpoint(
+                host="localhost",
+                port="1433",
+                database="master",
+                username="sa",
+                password="password",
+            ),
+            options={"auth_type": "sql"},
+        )
+
+        adapter.connect(config)
+
+        assert mock_conn.autocommit is True, (
+            "MSSQL adapter must set autocommit=True after connecting "
+            "to allow DDL statements like CREATE DATABASE"
+        )