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public DBUtil() { connectionString = WebConfigurationManager.ConnectionStrings[ "AdBoard"].ConnectionString; } public DataSet GetCategories() { string query = "SELECT * FROM Categories"; SqlCommand cmd = new SqlCommand(query); return FillDataSet(cmd, "Categories"); } public DataSet GetItems() { string query = "SELECT * FROM Items"; SqlCommand cmd = new SqlCommand(query); return FillDataSet(cmd, "Items"); } public DataSet GetItems(int categoryID) { // Create the Command. string query = "SELECT * FROM Items WHERE Category_ID=@CategoryID"; SqlCommand cmd = new SqlCommand(query); cmd.Parameters.AddWithValue("@CategoryID", categoryID); // Fill the DataSet. return FillDataSet(cmd, "Items"); } public void AddCategory(string name) { SqlConnection con = new SqlConnection(connectionString); // Create the Command. string insertSQL = "INSERT INTO Categories "; insertSQL += "(Name) VALUES @Name"; SqlCommand cmd = new SqlCommand(insertSQL, con); cmd.Parameters.AddWithValue("@Name", name);

You ve used an earlier example as the basis for this example, and you ve simply added a label to the page that you populate with the count of the number of Players for the selected Manufacturer. The count is returned by using the following COUNT(*) scalar function and returning this as the result from a SELECT query: SELECT COUNT(*) FROM Player WHERE @ManufacturerID = 0 OR Player.PlayerManufacturerID = @ManufacturerID You re filtering the results using a parameter, and by specifying COUNT(*) as the only column, the query will return a single row containing a single column. This is how you use the ExecuteScalar() method. The ExecuteScalar() method returns an object representing the value that has been returned from the query. In this case, you re returning an integer, and you need to convert this to a string before you can assign it to the Text property of the label, like so: lblCount.Text = Convert.ToString(myCommandCount.ExecuteScalar());

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{geturl} plug-in. Try updating the existing templates for registration, login, and updating details (located in the ./templates/account directory) that we created in 4 so the forms and any other links in the page use {geturl}. Alternatively, the downloadable source code for this and remaining chapters will use {geturl} wherever it should.

try { con.Open(); cmd.ExecuteNonQuery(); } finally { con.Close(); } } public void AddItem(string title, string description, decimal price, int categoryID) { SqlConnection con = new SqlConnection(connectionString); // Create the Command. string insertSQL = "INSERT INTO Items "; insertSQL += "(Title, Description, Price, Category_ID)"; insertSQL += "VALUES (@Title, @Description, @Price, @CategoryID)"; SqlCommand cmd = new SqlCommand(insertSQL, con); cmd.Parameters.AddWithValue("@Title", title); cmd.Parameters.AddWithValue("@Description", description); cmd.Parameters.AddWithValue("@Price", price); cmd.Parameters.AddWithValue("@CategoryID", categoryID); try { con.Open(); cmd.ExecuteNonQuery(); } finally { con.Close(); } } private DataSet FillDataSet(SqlCommand cmd, string tableName) { SqlConnection con = new SqlConnection(connectionString); cmd.Connection = con; SqlDataAdapter adapter = new SqlDataAdapter(cmd);

DataSet ds = new DataSet(); try { con.Open(); adapter.Fill(ds, tableName); } finally { con.Close(); } return ds; } } }

As any programmer will tell you, you re never going to write code that doesn t fall over at some point whether it s caused by an error within the code or something outside the scope of the code (such as someone unplugging the database server). Unless you have some way of handling any errors that occur, any problems you encounter can have the side effect of leaving connections to the database open. As you ve already learned, database connections are a finite resource, so leaving connections open is definitely not a good idea. If you re using SqlDataSource objects to connect to the database, as in 3, you don t need to worry about error handling to close the database connections. The SqlDataSource handles all the connections to the database internally, so you can be sure that any open database connections are handled before any error is thrown. However, when you re interacting with the database in code, you do need to catch and handle errors.

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