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A command can return more than one result set in two ways: If you re calling a stored procedure, it may use multiple SELECT statements If you re using a straight text command, you may be able to batch multiple commands by separating commands with a semicolon (;) Not all providers support this technique, but the SQL Server database provider does Here s an example of a string that defines a batch of three SELECT statements: string sql = "SELECT TOP 5 * FROM Employees;" + "SELECT TOP 5 * FROM Customers;SELECT TOP 5 * FROM Suppliers"; This string contains three queries Together, they return the first five records from the Employees table, the first five from the Customers table, and the first five from the Suppliers table Processing these results is fairly straightforward Initially, the DataReader will provide access to the results from the Employees table.

Once you ve finished using the Read() method to read all these records, you can call NextResult() to the next result set When there are no more result sets, this method returns false You can even cycle through all the available result sets with a while loop, although in this case you must be careful not to call NextResult() until you finish reading the first result set Here s an example: // Cycle through the records and all the rowsets, // and build the HTML string StringBuilder htmlStr = new StringBuilder(""); int i = 0; do { htmlStrAppend("<h2>Rowset: "); htmlStrAppend(iToString()); htmlStrAppend("</h2>"); while (readerRead()) { htmlStrAppend("<li>"); // Get all the fields in this row for (int field = 0; field < readerFieldCount; field++) { htmlStrAppend(readerGetName(field)ToString()); htmlStrAppend(": "); htmlStrAppend(readerGetValue(field)ToString()); htmlStrAppend("   "); } htmlStrAppend("</li>"); } htmlStr.

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Append("<br /><br />"); i++; } while (readerNextResult()); // Close the DataReader and the Connection readerClose(); conClose(); // Show the generated HTML code on the page HtmlContentText = htmlStrToString();.

Now that the view s arguments have been extracted from the URL, it is possible to verify these against what the configuration was supposed to obtain. This can be quite useful during development as a way to verify that everything is configured properly. Simply set up a middleware to print out the and variables along with . Then, if anything goes wrong with a view, the development server s console will have a handy way to identify or rule out a potential problem. This may seem like a perfect opportunity to do some detailed logging of the view that s about to be executed as well, since the view function object is available too. While this is true, the common use of decorators on views complicates matters. Specifically, the view function passed to this method will often be a wrapper function created by the decorator, rather than the view itself. This means that the introspection features detailed in 2 can t reliably be used to line up positional arguments with the names they were given in the function definition. There is still some good, though, as you should still be able to access the module and name of the view, as long as the decorators use the special decorator described in 9.

Note that in this case all the fields are accessed using the generic GetValue() method, which takes the index of the field to read. That s because the code is designed generically to read all the fields of all the returned result sets, no matter what query you use. However, in a realistic database application, you would almost certainly know which tables to expect as well as the corresponding table and field names. Figure 7-4 shows the page output.

Figure 7-4. Retrieving multiple result sets You don t always need to step through each record. If you re willing to show the data exactly as it is, with no extra processing or formatting, you can add a GridView control to your page and bind the DataReader to the GridView control in a single line. Here s the code you would use: // Specify the data source. GridView1.DataSource = reader; // Fill the GridView with all the records in the DataReader. DataView1.DataBind(); You ll learn much more about data binding and how to customize it in 9 and 10.

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