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Update the tag view.html template so it looks like this: <%inherit file="/base/index.html"/> <%def name="title()">Tag</%def> <%def name="heading()"><h1>Tag</h1></%def> ${c.tag.name} <%def name="footer()"> ## Add our tag links <p> <a href="${h.url_for(controller='tag', action='edit', id=c.tag.id)}">Edit Tag</a> | <a href="${h.url_for(controller='tag', action='delete', id=c.tag.id)}">Delete Tag</a> </p> ## Include the parent footer too ${parent.footer()} </%def> Finally, update the tag/list.html template so it looks like this: <%inherit file="/base/index.html" /> <%def name="heading()"><h1>Tag List</h1></%def> <%def name="buildrow(tag, odd=True)"> <tr class="${odd and 'odd' or 'even'}"> <td valign="top"> ${h.link_to( tag.id, h.url_for( controller=u'tag', action='view', id=unicode(tag.id) ) )} </td> <td valign="top"> ${tag.name} </td> </tr> </%def> % if len(c.paginator): <p>${ c.paginator.pager('$link_first $link_previous $first_item to $last_item of $item_count $link_next $link_last') }</p> <table class="paginator"><tr><th>Tag ID</th><th>Tag Name</th></tr> <% counter=0 %> % for item in c.paginator: ${buildrow(item, counter%2)} <% counter += 1 %> % endfor </table>

lastError(); If the execution of the query completes without problems, it is time to look at the results Listing 13-4 shows how that is done First a QSqlRecord is retrieved The record represents a row in the results, and you can get the total number of columns using the count method The names of the returned columns are available from the fieldName(int) method With these two methods, a string with the column names is created in the first for loop In the while loop the first results row is requested from the QSqlQuery object by using the next method When a query object returns from a successful exec call, the current row is nothing (that is, NULL) This is indicated as isValid is false When calling next, the next row from the results is returned if available The first time the method is called, the first row is called.

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<p>${ c.paginator.pager('~2~') }</p> % else: <p> No tags have yet been created. <a href="${h.url_for(controller='tag', action='new')}">Add one</a>. </p> % endif That s it the tag controller is complete, so you could now start creating tags by visiting http:// localhost:5000/tag/new; however, before you do, let s add a few restrictions to what can be used as a tag name.

osw.write ("HTTP/1.0 404 Not Found\n\n"); return; } /* If the requested file can be successfully opened and read, then return an OK response code and send the contents of the file. */ osw.write ("HTTP/1.0 200 OK\n\n"); while (c != -1) { sb.append((char)c); c = fr.read(); } osw.write (sb.toString()); } /* This method is called when the program is run from the command line. */ public static void main (String argv[]) throws Exception { /* Create a SimpleWebServer object and run it. */ SimpleWebServer sws = new SimpleWebServer(); sws.run(); }

When the call tries to move beyond the last available row, the return value is false..

You ll put a restriction on tag names to ensure they can be made only from letters, numbers, and the space character and can consist of 20 characters or less Also, you don t want users to add a tag with a name that already exists Of course, because of the constraints you set up when defining the model, you know that an exception will be raised if a nonunique tag name is added, but the 500 Internal Server Error page that will be generated doesn t provide a way to let the user fix the error, so you need a FormEncode validator to check for the error before it occurs and to display an appropriate error message if necessary First let s create a validator to check for unique tags and update the NewTagForm schema to use it.

For each row, the values from the columns are gathered by using the value(int) method The value method returns a QVariant, so it has to be converted into a QString by using the toString method Different columns can be of different values, so it is not necessary to use the toString method The QVariant class has methods for converting the value into most types The most common are toInt, toDouble, toBool, and toString Listing 13-4 Iterating over the column names and the results rows QSqlRecord rec = qryrecord(); int cols = reccount(); QString temp; for( int c=0; c<cols; c++ ) temp += recfieldName(c) + ((c<cols-1) "\t":""); qDebug() << temp; while( qrynext() ) { temp = ""; for( int c=0; c<cols; c++ ) temp += qryvalue(c).

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