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Now that you ve seen how to handle a one-to-many mapping (sometimes called a parent-child relationship) between pages and comments, you can turn your attention to the many-to-many mapping between tags and pages. Once again, tags can be created, viewed, updated, or deleted. So, the controller that manipulates them would need the same actions as the page and comment controllers you ve created so far. In addition, each page can have multiple tags, and each tag can be used on multiple pages so that tags can t be considered children of pages any more than pages can be considered children of tags. The way you ll implement this is by once again starting with a simple controller and renaming the core variables with the word tag. You ll then tweak the controller so that it correctly handles the columns of the tag table. After you ve done this, users will be able to add, edit, remove, and list tags. I ll then cover how to associate tags with pages. Ordinarily, you would need to create a second controller for handling the adding, editing, listing, and deleting of the associations between the page table and the tag table. In this case, though, you ll take a shortcut. Rather than having a second controller to handle the interactions, you will simply display a check box group of all the available tags on each page. Users can then select the tags they want associated with the page, and SQAlchemy will handle how to store those associations in the pagetag table for you automatically.

StringTokenizer st = new StringTokenizer (request, " "); command = st.nextToken(); pathname = st.nextToken(); if (command.equals("GET")) { /* If the request is a GET, try to respond with the file the user is requesting. */ serveFile (osw,pathname); } else { /* If the request is a NOT a GET, return an error saying this server does not implement the requested command. */ osw.write ("HTTP/1.0 501 Not Implemented\n\n"); } /* Close the connection to the client. */ osw.close(); } public void serveFile (OutputStreamWriter osw, String pathname) throws Exception { FileReader fr = null; int c = -1; StringBuffer sb = new StringBuffer(); /* Remove the initial slash at the beginning of the pathname in the request. */ if (pathname.charAt(0) == '/') pathname = pathname.substring(1); /* If there was no filename specified by the client, serve the "index.html" file. */ if (pathname.equals("")) pathname = "index.html"; /* Try to open file specified by pathname. */ try { fr = new FileReader (pathname); c = fr.read(); } catch (Exception e) { /* If the file is not found, return the appropriate HTTP response code. */

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A nice feature of the SQLite database engine is that the database can be created in memory. This means that the execution is very fast because no loading from and saving to disk is required. If you want the information to last beyond the termination of the application, you have to store it explicitly to a file or another database. By specifying the file name ":memory: ", as shown in the following code line, the database will be contained in memory: db.setDatabaseName( ":memory:" ); When a QSqlDatabase object represents a connection that is not longer used, you can close it using the close method. Any open connection is automatically closed by the QSqlDatabase destructor if left opened.

Let s start by creating the tag controller from the template copied earlier: $ cd simplesite/controllers $ cp template.py.txt tag.py $ perl -pi -w -e 's/comment/tag/g; s/Comment/Tag/g;' tag.py You ll need to correct the new tag controller s list() action too because some of the variables will have been accidentally renamed. Change it to look like this: def list(self): tag_q = meta.Session.query(model.Tag) c.paginator = paginate.Page( tag_q, page=int(request.params.get('page', 1)), items_per_page = 10, controller='tag', action='list' ) return render('/derived/tag/list.html') Now let s do the same with the templates, but let s use the page templates as a basis: $ $ $ $ cd ../templates/derived cp -r page tag cd tag perl -pi -w -e 's/page/tag/g; s/Page/Tag/g;' *.html

Once again, you ll need to update list.html to use c.paginator.pager(), not c.paginator.tagr(). Now restart the server if you stopped it to make these changes, and let s get started with the updates: $ cd ../../../../ $ paster serve --reload development.ini Tags have a name only, so update the NewTagForm schema to look like this: class NewTagForm(formencode.Schema): allow_extra_fields = True filter_extra_fields = True name = formencode.validators.String(not_empty=True) Change the edit() action so that the values passed to htmlfill.render() look like this: values = { 'name': tag.name, } Next, change the fields.html template so that it looks like this: ${h.field( "Name", h.text(name='name'), required=True, )}

When passing an SQL query to a database, a QSqlQuery object is used to represent both the query and the results returned from the database engine Let s start by looking at a simple SELECT query Listing 13-3 shows a query being executed The SQL statement is simply passed to the exec method of a QSqlQuery object If the execution fails, the exec method returns false Upon failure, the lastError method of the query object contains more information about what went wrong Because you are dealing with a server being queried by a client application, it is not necessarily the SQL statement that is wrong it can also be connection failure, user authentication issues, or many other reasons Listing 13-3 Preparing and executing an SQL query if( !qryexec( "SELECT firstname, lastname FROM names " "WHERE lastname = 'Roe' ORDER BY firstname" ) ) qDebug() << qry.

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