Fix NULL nullable civil types OUT parameter handling to use typed NULLs

Co-authored-by: shueybubbles <[email protected]>

Author: Copilot

civil_null_test.go

@@ -275,7 +275,7 @@ func TestNullCivilTypesParameterEncoding(t *testing.T) {
 	// Create a mock connection and statement for testing
 	c := &Conn{}
 	c.sess = &tdsSession{}
-	c.sess.loginAck.TDSVersion = verTDS74  // Use modern TDS version
+	c.sess.loginAck.TDSVersion = verTDS74 // Use modern TDS version
 	s := &Stmt{c: c}
 
 	t.Run("NullDate parameter encoding", func(t *testing.T) {

mssql.go

@@ -1000,26 +1000,32 @@ func (s *Stmt) makeParam(val driver.Value) (res param, err error) {
 		if valuer.Valid {
 			return s.makeParamExtra(valuer.Date)
 		}
+		return s.makeParamExtra(valuer)
 	case NullDateTime:
 		if valuer.Valid {
 			return s.makeParamExtra(valuer.DateTime)
 		}
+		return s.makeParamExtra(valuer)
 	case NullTime:
 		if valuer.Valid {
 			return s.makeParamExtra(valuer.Time)
 		}
+		return s.makeParamExtra(valuer)
 	case *NullDate:
 		if valuer.Valid {
 			return s.makeParamExtra(valuer.Date)
 		}
+		return s.makeParamExtra(*valuer)
 	case *NullDateTime:
 		if valuer.Valid {
 			return s.makeParamExtra(valuer.DateTime)
 		}
+		return s.makeParamExtra(*valuer)
 	case *NullTime:
 		if valuer.Valid {
 			return s.makeParamExtra(valuer.Time)
 		}
+		return s.makeParamExtra(*valuer)
 	case UniqueIdentifier:
 	case NullUniqueIdentifier:
 	default: