参数“sql”的预期类型为 utf8，但类型为“object”

Question

我正在尝试GNOME JavsScript tutorial，似乎是not to work in its original version。

  var gdaStrConn = Gda.Connection.open_from_string("SQLite", "DB_DIR=" + GLib.get_home_dir () + ";DB_NAME=gnome_demo", null, 0);
  print('Connected');
  gdaStrConn.execute_non_select_command (this.connection, 'create table demo (id integer, name varchar(100))');

函数execute_non_select_command 的文档说：

gint                gda_connection_execute_non_select_command
                                                        (GdaConnection *cnc,
                                                         const gchar *sql,
                                                         GError **error);
This is a convenience function to execute a SQL command over the opened connection. For the returned value, see gda_connection_statement_execute_non_select()'s documentation.

cnc : an opened connection
sql : a query statement that must not begin with "SELECT"
error : a place to store errors, or NULL
Returns : the number of rows affected or -1, or -2

现在我收到以下错误：

(gjs:25295): Gjs-WARNING **: JS ERROR: Error: Expected type utf8 for Argument 'sql' but got type 'object'

为什么会出现这个错误，因为 sql 参数是一个字符串：'create table demo (id integer, name varchar(100))'?

那个电话有什么问题？

Answer 1

在第 3 行省略函数中的第一个参数，因此该行如下所示：

gdaStrConn.execute_non_select_command ('create table demo (id integer, name varchar(100))');

我不知道为什么会这样，只是自己学习 gjs。