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Method named Fill is defined on interface
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public class Employee : IBusinessEntity { private int _id; private string _firstName; private string _lastName; private string _jobTitle;
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Business entity implements interface
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public int ID { get { return _id; } set { _id = value; } } public string FirstName { get { return _firstName; } set { _firstName = value; } } public string LastName { get { return _lastName; } set { _lastName = value; } } public string JobTitle { get { return _jobTitle; } set { _jobTitle = value; } } public void Fill(SqlDataReader reader) { _id = reader.GetInt32(0); _firstName = reader.GetString(1); _lastName = reader.GetString(2); _jobTitle = reader.GetString(3); } } }
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And provides custom implementation of interface method
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Notice that the Employee class contains a property for each field returned by the ListEmployeesByDepartment SQL and that the Fill method is used to map the data returned from that SQL into the properties. In just a moment we ll write the generic helper method that will connect to the database and retrieve data from it. This helper code will then call the Fill method on the relevant business entity object, passing in the SqlDataReader. By having the Fill method defined on an interface, this helper class does not need to know about any of the actual business entities as it can communicate through the interface. Data helper functions The helper method that we are about to create will perform the tasks common to all data access operations. It will prepare the SQL, add it to an SqlCommand object, and fire the query against the database. Even though this code must be run for all business entities, it needs to be written only once because the logic is the same regardless of the business entity that it is operating over. From within the AW.Portal.Data project, open the DataLayer.cs file and add the code for the helper method shown in listing 1.8.
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Listing 1.8 GetDataItem method uses a new feature of the .NET Framework known as Generics to allow its code to run over any type which conforms to the generic constraints that are specified.
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private T GetDataItem<T>(string commandText, string[] parameterNames, object[] parameterValues) Specify Generic constraints where T : IBusinessEntity, new() { SqlConnection cnn = new SqlConnection(this.ConnectionString); SqlCommand cmd = new SqlCommand(); cmd.CommandType = CommandType.Text; cmd.Connection = cnn; cmd.CommandText = commandText; if (parameterNames != null && parameterNames.Length for (int i = 0; i < parameterNames.Length; i++) cmd.Parameters.AddWithValue( parameterNames[i], parameterValues[i] ); } } T dataItem = new T(); try { cnn.Open(); using (SqlDataReader reader = cmd.ExecuteReader()) { if (reader != null) { reader.Read(); Read data into item dataItem.Fill(reader); } } } finally { if (cnn.State == ConnectionState.Open) { cnn.Close(); } } return dataItem; } > 0) { {
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Add parameters to our command
NOTE
This generic method executes a statement and returns a single business entity. The completed project that comes with this book also contains a second method named GetDataItems for executing statements and returning collections of business entity objects.
As we ll illustrate, having this data access logic allows us to use a single line of code to execute SQL queries from a calling method, and ensures that all of the code for creating
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connections and cleaning them up is common. This in return reduces the chances of introducing logic errors in multiple places. You can also see that the code uses a new feature of the .NET Framework known as Generics. Generics is a powerful new addition to the .NET Framework in the 2.0 release that allows a developer to write code against types that are not defined until runtime, and provides a way to use generic constraints to constrain the types of data that can be accepted. Notice how our IBusinessEntity interface allows these generic helper methods to call Fill(...) on an object that is merely defined as a T. This is because of the Generic constraints that are added to the method informing the compiler that T is a type of IBusinessEntity. Adding the new() constraint to the generic T item allows it to create new instances of the generic T type.
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