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In addition to some of the statements already described in this chapter, other troublesome statements an attacker might inject include the following: Statements that insert or modify data in the database: For example, injecting the statement INSERT INTO admin_users VALUES ('hacker', ...) which inserts a row into the application s admin_users table, would have the effect of creating an administrative account for the application, for which the attacker has chosen (and hence knows) the username and password. This would give the attacker access to the application s administrative functions, which might include the ability to review users personal information, initiate refunds of credit card payments, and so on. Various database-administrative commands: Depending on the command set supported by the particular database, this may allow the attacker to shut down the database, initiate network connections from the database host, and even instruct the operating system on which the database server is running to execute commands or programs of the attacker s choosing.4 The latter would likely result in a full compromise of the database server. Additional attack patterns are discussed in Advanced SQL Injection in SQL Server Applications, by Chris Anley, and Manipulating Microsoft SQL Server Using SQL Injection, by Cesar Cerrudo.

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The configuration for the default implementation is: <barcode> < upc-a > <height>{ length:15mm}</height> <module-width>{length:0.33mm}</module-width> ...

The Python Package Index authentication is very weak, and passwords are transmitted in plain text. Don t use any sign-in details that you use for important applications because they could be easily intercepted.

The second alternative is QLinkedList, which provides a linked list implementation that gives quick iterations, but has no indexed access. It also supports constant time insertions independently of where in the list the new item is inserted. Another nice aspect is that iterators stay valid as long as the element is left in the list it is possible to freely remove and insert new items in the list and still use the iterator. Table 1-1 compares the linked list and vector classes to the QList. Table 1-1. Comparison of QList, QVector, and QLinkedList

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If you visit http://pypi.python.org/pypi/SimpleSite/0.3.0, you ll see the page that was created by the previous command. It was also shown a few pages ago in Figure 19-7. You ll also notice that new projects appear at the top of the list of recent projects on the Python Package Index home page, as shown in Figure 19-8.

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Before we can introduce techniques to prevent SQL injection attacks, we consider a variation of the vulnerability as it applies to queries with string-valued parameters. In the example introduced at the beginning of this section, the parameter vulnerable to injection was used in the query in a context in which a numeric quantity was expected: sql_query = ... + "AND order_month=" + request.getParameter("month"); In contrast, parameters that are used in an SQL statement in a context in which a string is expected need to be enclosed in quote characters to allow the SQL parser to correctly parse the data as a string literal. For example, suppose the application also provides a feature to users that allows them to review all orders of pizzas with a particular topping. The corresponding search form would have a field topping, and the resulting SQL query would be constructed as follows: sql_query = "SELECT pizza, toppings, quantity, order_day " + "FROM orders " + "WHERE userid=" + session.getCurrentUserId() + " " + "AND toppings LIKE '%" + request.getParameter("topping") + "%' ";

Until now, you have looked at lists for generic purposes. Qt also has a set of specialized lists. Let s start by having a look at the QStringList.

Figure 19-8. The SimpleSite project on the Python Package Index You can now sign in to the Python Package Index with the account details you used when you registered your application and upload the eggs you ve created, or if you prefer, you can even have Python do it for you; just enter this command for each version of Python supported to upload the eggs for you: $ python2.4 setup.py bdist_egg register upload $ python2.5 setup.py bdist_egg register upload

4. Depending on the configuration of the database server, this may, for example, be possible using the xp_cmdshell extended stored procedure supported by Microsoft s SQL Server.

The string list class inherits QList<QString> and can be treated as such. However, it also has some string-specific methods that make it useful. First, you need to create a list and fill it with some contents. This should not bring any surprises: QStringList list; list << "foo" << "bar" << "baz"; This gives you a list containing "foo", "bar" and "baz". You can join them with a string of your choice between them. Here it is a comma: QString all = list.join(","); The string all will contain "foo,bar,baz" after this operation. Another thing to do is to replace something in all strings contained in the list. For example, you can replace all occurrences of "a" with "oo": list.replaceInStrings( "a", "oo" ); The replacement operation results in a new list with the following contents: "foo", "boor", and "booz". Besides join, QString also has a method called split. This method splits the given string by each occurrence of a given string and returns a QStringList that is easily added to the already existing list. In this example, you split by each comma: list << all.split(","); The final list will contain the items "foo", "boor", "booz", "foo", "bar", and "baz".

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UPC-A barcode generator can print UPC-A and saved it as GIF and JPEG images using Java class library. Generated UPC-A barcode images can be displayed ...

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