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I don't quite understand the different between insert_with_all_relation and insert, There is no doc to describe them, Could you give me an example to show the difference?

From qxBlog tutorial, imagine that you have a blog instance, and this blog contains a list of comments.
To save it into database, you can save first your blog, and then the list of comments, like this :

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daoError = qx::dao::insert(my_blog);
daoError = qx::dao::insert(my_list_of_comments);

Or you can use the 'insert_with_all_relation()' function, and you have only 1 line of code with the same behaviour :

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daoError = qx::dao::insert_with_all_relation(my_blog);

* qx::dao::insert => save only 1 table.
* qx::dao::insert_with_all_relation => save parent table and all its relations.

Moreover, there is an automatic mechanism of commit/rollback if you use insert_with_all_relation() (nothing saved if there is an error during process).
To have a commit/rollback mechanism using insert function, you can use a session (qx::QxSession class), goto here for more details about this feature :
http://www.qxorm.com/qxorm_en/faq.html#faq_170

I got it, thank you very much.