anchor.diff:    }
   
     /// Executes a single SQL statement.
  -  /// See [Statement#execute].
  +  /// See [Statement.execute].
     int execute(String statement, [params=const [], bool callback(Row)]) {
       _checkOpen();
       statement = prepare(statement);
  
positive.code:   }
  
    /// Executes this statement.
    /// If this statement contains placeholders, their values must be specified in [params].
    /// If [callback] is given, it will be invoked for each [Row] that this statement produces.
    /// [callback] may return [:true:] to stop fetching rows.
    /// Returns the number of rows fetched (for statements which produce rows), 
    /// or the number of rows affected (for statements which alter data).
    int execute([params = const [], bool callback(Row)]) {
  
negative.code: #import("dart-ext:dart_sqlite");
  
  /// A connection to a SQLite database. 
  ///
  /// Each database must be [close]d after use.
  class Database {
    var _db;
    /// The location on disk of the database file.
  