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As you can see, this example uses many of the same principles you ve already learned about but in a more compact form. The table name has to be specified via a __tablename__ attribute, but SQLAlchemy can infer the column names from the attribute names you ve specified. When setting up the relationships, you can pass a string to relation() rather than a class because you might need to map a relationship before the class has been defined. Classes that are mapped explicitly using mapper() can interact freely with declarative classes, and table definitions created explicitly can be used too, as you can see with the pagetag table in the previous example. Declarative classes get access to the underlying metadata object, and hence the underlying engine, because they are inherited from Base, and Base has access to metadata because it is passed as an argument to the declarative_base() function. The underlying Table object created by the declarative_base() version of each of these classes is accessible via the class s __table__ attribute, as you can see from the last line in the example. If you save the updated model.py, you will find that all the examples using the object_test module still work in the same way, even with the new model. Although the Declarative API can be more approachable to newcomers, most Pylons developers at the moment still choose to use the more explicit APIs you saw earlier, which is the approach you ll follow for the rest of the book. If you are interested in using the Declarative API, you should read the SQLAlchemy documentation at http://www.sqlalchemy.org/docs/05/plugins.html# plugins_declarative.

currentFilename = filename; docWidget->document()->setModified( false ); setWindowTitle( tr("%1[*] - %2" ).arg(filename).arg(tr("SDI")) ); } The opposite method of loadFile is saveFile(const QString &). (You can see its implementation in Listing 8-23.) Despite their different tasks, the two functions implementations look very similar. The concept is the same: attempt to open the file, send the document as plain text to a stream and update the currentFilename, reset the modified bit, and update the window title. When a file is actually saved, the saveFile function returns true; if the file is not saved, the function returns false. Listing 8-23. Source code for saving the document to a file bool SdiWindow::saveFile( const QString &filename ) { QFile file( filename ); if( !file.open( QIODevice::WriteOnly | QIODevice::Text ) ) { QMessageBox::warning( this, tr("SDI"), tr("Failed to save file.") ); return false; } QTextStream stream( &file ); stream << docWidget->toPlainText(); currentFilename = filename; docWidget->document()->setModified( false ); setWindowTitle( tr("%1[*] - %2" ).arg(filename).arg(tr("SDI")) ); return true; } The return value from the saveFile method is used in the implementation of the fileSaveAs method shown in Listing 8-24. The Save As slot looks very much like the Open slot. It uses the getSaveFileName method to ask the user for a new file name. If a file name is selected, the saveFile method is called to try to save the document. Notice that false is returned if the file dialog is canceled, and the return value from the saveFile method is returned when an attempt to save the document is made. The saveFile returns true only if the document actually has been written to the file. Listing 8-24. Source code for the Save As action bool SdiWindow::fileSaveAs() { QString filename = QFileDialog::getSaveFileName( this, tr("Save As"), currentFilename );

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One way to construct a MAC is to encrypt the message using a block cipher such as AES in CBC mode. An IV of 0 can be used, and the last encrypted block can serve as the tag. Since each encrypted block depends on every block before it, one can argue that if either the message or the MAC is modified by Mallory, then Bob would be able to detect the modification. However, it has been shown that MACs based on CBC are not secure in various cases, such as the case in which Alice needs to send a variable-length message to Bob (see Section 5 of The Security of Cipher Block Chaining, by M. Bellare, J. Kilian, and P Rogaway, for a brief . explanation why). Variants of the CBC MAC such as OMAC, XCBC, TMAC, EMAC, and RMAC have been proposed. Of these, OMAC seems to be secure, and more efficient than the other alternatives (Iwata 2003).1

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