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To work with named parameters or parameters of defined types, you must access the Command object that will be used to execute the query, and manipulate its collection or parameters. The Data Access block makes it easy to create and access the Command object by using two methods of the Database class: GetSqlStringCommand and GetStoredProcCommand. These methods return an instance of the appropriate command class for the configured database as a provider-independent DbCommand type reference. After you create the appropriate type of command, you can use the many variations of the Database methods to manipulate the collection of parameters. You can add parameters with a specific direction using the AddInParameter or AddOutParameter method, or by using the AddParameter method and providing a value for the Parameter Direction parameter. You can change the value of existing parameters already added to the command using the GetParameterValue and SetParameterValue methods. The following code shows how easy it is to create a command, add an input parameter, and execute both a SQL statement and a stored procedure. Notice how the code specifies the command to which the Database class should add the parameter (there could be more than one connection defined for the database), the name, the data type, and the value of the new parameter.
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// Read data with a SQL statement that accepts one parameter prefixed with @. string sqlStatement = "SELECT TOP 1 * FROM OrderList WHERE State LIKE @state"; // Create a suitable command type and add the required parameter. using (DbCommand sqlCmd = defaultDB.GetSqlStringCommand(sqlStatement)) { defaultDB.AddInParameter(sqlCmd, "state", DbType.String, "New York"); // Call the ExecuteReader method with the command. using (IDataReader sqlReader = namedDB.ExecuteReader(sqlCmd)) { DisplayRowValues(sqlReader); } } // Now read the same data with a stored procedure that accepts one parameter. string storedProcName = "ListOrdersByState"; // Create a suitable command type and add the required parameter. using (DbCommand sprocCmd = defaultDB.GetStoredProcCommand(storedProcName)) { defaultDB.AddInParameter(sprocCmd, "state", DbType.String, "New York"); // Call the ExecuteReader method with the command. using (IDataReader sprocReader = namedDB.ExecuteReader(sprocCmd)) {
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DisplayRowValues(sprocReader); } }
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The example named Return rows using a SQL statement or stored procedure with named parameters uses the code you see above to execute a SQL statement and a stored procedure against the sample database. The code provides the same parameter value to each, and both queries return the same single row, as shown here.
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Id = 4 Status = DRAFT CreatedOn = 07/02/2009 05:12:06 Name = BB Ball Bearing LastName = Abel FirstName = Catherine ShipStreet = 888 Main Street ShipCity = New York ShipZipCode = 54321 ShippingOption = Three-day shipping State = New York
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Modern programming techniques typically concentrate on data as objects. This approach is useful if you use Data Transfer Objects (DTOs) (see http://msdn.microsoft.com/en-us/ library/ms978717.aspx) to pass data around you application layers, implement a data access layer using O/RM techniques, or want to take advantage of new client-side data querying techniques such as LINQ. The Data Access block is not, in itself, an O/RM solution; but it contains features that allow you to extract data using a SQL statement or a stored procedure as the query, and have the data returned to you as a sequence of objects that implements the IEnumerable interface. This allows you to execute queries, or obtain lists or arrays of objects that represent the original data in the database. About Accessors The block provides two core classes for performing this kind of query: the SprocAccessor and the SqlStringAccessor. You can create and execute these accessors in one operation using the ExecuteSprocAccessor and ExecuteSqlAccessor methods of the Database class, or create a new accessor directly and then call its Execute method. Accessors use two other objects to manage the parameters you want to pass into the accessor (and on to the database as it executes the query), and to map the values in the rows returned from the database to the properties of the objects it will return to the client code. Figure 2 shows the overall process.
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