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Assume you use the following SQL statement to check a user s name and login before granting them access to your application: SELECT * FROM [Users] WHERE [UserName]='user' AND PASSWORD='Pwd'; Now, let s see what happens if a malicious enters a valid username with a single quote and a comment character behind it (for example, user'--): SELECT * FROM [Users] WHERE [UserName]='user'--' AND PASSWORD='Pwd'; Notice that the username string is terminated "prematurely," but the rest of the line is commented out (avoiding syntax errors with the nonterminated string), so the SQL statement remains valid but lacks the password validation And, it gets worse If a really malicious user wants to attack your system, he could use a login name like user'; DELETE FROM [Users]; --.

3

This turns your seemingly innocuous login statement into this: SELECT * FROM [Users] WHERE [UserName]='user'; DELETE FROM [Users]; --' AND PASSWORD='Pwd'; Now you have a real problem because your entire user table is erased and an evil user is logged in to your application Luckily, there is an easy way to avoid these issues: use parameterized queries instead of building SQL statements manually Parameterized queries use parameters as placeholders for values you want to use in the SQL Statement Before you execute the SQL statement, you add parameters to the command object so the SQL statement knows which values you want to use for the parameters Following is an example of how to use a parameterized query: Dim SQL As String = "SELECT * FROM [Table] " & _ "WHERE [SomeParam]=@MyParam1 AND [SomeOtherParam]=@MyParam2;" Dim dbConn As New SqlConnection(ConfigMyConnectionString) Dim dbCmd As New SqlCommand(SQL, dbConn) 'Setup the SettingName Parameters dbCmd.

I thank her for all the support and encouragement In the end, I say a big thank you to all my friends, too many to name individually; you know who you are..

ParametersAdd("@MyParam1", DataSqlDbTypeVarChar)Value = "Value1" dbCmdParametersAdd("@MyParam2", DataSqlDbTypeInt)Value = 5 You need to be aware of a couple of things when using parameterized queries First off, you do not need to put quotes around the parameter in the SQL statement Notice that @SettingName is not surrounded by quotes even though it is a string (varchar) value The command object automatically determines the appropriate quotation marks required for the SQL statement based on the type of the parameter, which you specify when you create the parameter The command object also escapes any single quotes contained in the parameter value, which is why parameterized queries are not as prone to SQL injection attacks..

Note To escape a single quote in SQL, you prefix it with another single quote. For example, O Reily is a

This chapter is the first in a series to explore pure Java gaming with a real-world game dubbed Space Blaster. The goal of this game is to maneuver (using your finger tips or the keyboard) a space ship through a field of meteors. This chapter will teach you how to build custom XML-based linear layout, how to use an abstract class and timer tasks to simulate a simple game loop, how to invalidate views within a non-UI thread, how to load sprites and sounds from the project resources, plus drawing techniques such as sprite animations, drawing simple objects, and setting style and color using the Paint object.

SearchFormFileName method. For reference, when the SearchFormIndex is set to 0, the page displays the simple form. When it is 1, the page displays the advanced form. After setting the SearchFormIndex, the method calls LoadSearchForm because the SearchFormIndex changed and the ReportFramework needs to load the new ISearchControl component into the page. The Pre_Render method looks at the SearchFormIndex value and assigns Toggle SearchForm.Text a value describing the opposite search form. If the page is displaying the simple form, then the ToggleSearchForm.Text contains "Advanced Search"; if the advanced form is shown, then ToggleSearchForm.Text contains "Simple Search". This allows the user to either fill out the current form or click on the appropriately named LinkButton to take them to the other form.