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directly in our PHP code by first loading the modifier (using $smarty->_get_plugin_filepath() to retrieve the full path of the plug-in and then passing the plug-in type and name as the arguments) and then calling smarty_modifier_truncate() on the string.

acting with a database) and then throw less detailed exceptions like ApplicationException to notify the web page. That way, there s no chance that the user will see the technical error information. This is important, because detailed error messages can give hackers clues to how your code works and how to subvert it.

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As you saw in 1, before you can do anything with a data source, you must make a connection to it. You ve spent some time in this chapter looking at connecting to several different data sources using the following Connection and Command objects: SQL Server 2005 using the SqlConnection and SqlCommand objects MySQL 5.0 using the OdbcConnection and OdbcCommand objects Microsoft Access using the Jet engine through the OleDbConnection and OleDbCommand objects Although you ve looked at all three different data sources and three different sets of objects, the beauty of the data provider architecture in ASP.NET is that the paradigm for all of the Connection and Command objects is exactly the same. You also briefly looked at some of the other properties and methods of the Connection and Command objects. Next, you learned about passing parameters into queries, and got your first look at how the different objects behave slightly differently. The SqlCommand object can handle named parameters, whereas the OdbcCommand and OleDbCommand objects, in our scenario, require parameters presented in the order in which they re to be used.

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The final thing to note in this function is that the URLs and titles are escaped as required when adding elements to the $links array. This ensures that valid HTML is generated and also prevents cross-site scripting (XSS) and cross-site request forgery (CSRF). This is explained in more detail in 7.

The component doesn t have to limit the type of information it provides to DataSets. Other information is also useful. For example, you might provide a read-only property called ItemFields that returns an array of strings representing the names for fields in the Items table. Or you might add another method that retrieves aggregate information about the entire table, such as the average cost of items in the database or the total number of currently listed items, as shown here: public class DBUtil { // (Other class code omitted.) public decimal GetAveragePrice() { string query = "SELECT AVG(Price) FROM Items"; SqlConnection con = new SqlConnection(connectionString); SqlCommand cmd = new SqlCommand(query, con); con.Open(); decimal average = (decimal)cmd.ExecuteScalar(); con.Close();

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return average; } public int GetTotalItems() { string query = "SELECT Count(*) FROM Items"; SqlConnection con = new SqlConnection(connectionString); SqlCommand cmd = new SqlCommand(query, con); con.Open(); int count = (int)cmd.ExecuteScalar(); con.Close(); return count; } } These queries use some SQL that may be new to you (namely, the COUNT and AVG aggregate functions). However, these methods are just as easy to use from the client s perspective as GetItems() and GetCategories(): DBUtil DB = new DBUtil(); decimal averagePrice = DB.GetAveragePrice(); int totalItems = DB.GetTotalItems(); It may have occurred to you that you can return information such as the total number of items through a read-only property procedure (such as TotalItems) instead of a method (in this case, GetTotalItems). Though this does work, property procedures are better left to information that is maintained with the class (in a private variable) or is easy to reconstruct. In this case, it takes a database operation to count the number of rows, and this database operation can cause an unusual problem or slow down performance if used frequently. To help reinforce that fact, a method is used instead of a property.

You then took a brief look at scalar functions and the ExecuteScalar() method as an alternative for returning information from the database when you want to return only one value. At the end of the chapter, you looked at basic error handling and wrote an error handler that ensures you never leave any open connections. The examples that you ve seen so far have been simple pages that performed one task to give you a foundation in using databases and the different queries you can perform. In the next four chapters, you ll build on the techniques you ve developed and learn how to build interactive pages. You ll also start to see the real power that s available to data-driven Web sites.

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