static void Main(string[] args)
{
// step 4-2. data mapping with interface implementation.
SqlConnection db = new SqlConnection("initial catalog=Northwind; integrated security=SSPI");
SqlCommand dbcmd = new SqlCommand(@"SELECT EmployeeID, LastName, FirstName, Title, HomePhone FROM Employees", db);
List<Employee> employees = new List<Employee>();
// for method 2, prepare configuration.
EntitySetConfiguration entitySetConfiguration =
ConfigurationManager.GetSection("entitySetConfiguration") as EntitySetConfiguration;
EntityConfiguration employeeMapConfiguration =
entitySetConfiguration.EntityConfigurations.GetConfigurationFromType(typeof(Employee).FullName);
db.Open();
SqlDataReader reader = dbcmd.ExecuteReader(CommandBehavior.CloseConnection);
while (reader.Read())
{
Employee employee = new Employee();
PropertyInfo[] properties = employee.GetType().GetProperties();
foreach (PropertyInfo property in properties)
{
int ordinal = -1;
Type propType = property.PropertyType;
// method 1, implement a interface to map entity and schema.
//Contracts.IDataSourceColumnMapper dsMapper = employee as Contracts.IDataSourceColumnMapper;
// method 2, provision map information from configuration.
EntitySchemaMap schemaMap = employeeMapConfiguration.EntitySchemaMaps.GetConfigurationFromPropertyName(property.Name);
// get column index, if not exist, set -1 to ignore.
try
{
// ordinal = reader.GetOrdinal(dsMapper.GetDataSourceColumn(property.Name));
ordinal = reader.GetOrdinal(schemaMap.EntitySchemaName);
}
catch (Exception)
{
ordinal = -1;
}
// set value.
if (ordinal >= 0)
{
ITypeConverter typeConverter = TypeConverterFactory.GetConvertType(propType);
if (!propType.IsEnum)
{
property.SetValue(employee,
Convert.ChangeType(typeConverter.Convert(reader.GetValue(ordinal)), propType), null);
}
else
{
EnumConverter converter = typeConverter as EnumConverter;
property.SetValue(employee,
Convert.ChangeType(converter.Convert(propType, reader.GetValue(ordinal)), propType), null);
}
}
}
employees.Add(employee);
}
reader.Close();
db.Close();
foreach (Employee employee in employees)
{
Console.WriteLine("id: {0}, name: {1}, title: {2}, phone: {3}",
employee.EmployeeID, employee.FirstName + ' ' + employee.LastName, employee.Title, employee.Phone);
}
Console.WriteLine("");
Console.WriteLine("Press ENTER to exit.");
Console.ReadLine();
}
static void Main(string[] args)
{
// step 4. handling data type convert.
SqlConnection db = new SqlConnection("initial catalog=Northwind; integrated security=SSPI");
SqlCommand dbcmd = new SqlCommand(@"SELECT EmployeeID, LastName, FirstName, Title, HomePhone FROM Employees", db);
List<Employee> employees = new List<Employee>();
db.Open();
SqlDataReader reader = dbcmd.ExecuteReader(CommandBehavior.CloseConnection);
while (reader.Read())
{
Employee employee = new Employee();
PropertyInfo[] properties = employee.GetType().GetProperties();
foreach (PropertyInfo property in properties)
{
int ordinal = -1;
Type propType = property.PropertyType;
string dataSourceColumnName = null;
// get attribute.
DataSourceColumnAttribute[] attributes =
property.GetCustomAttributes(typeof(DataSourceColumnAttribute), true) as DataSourceColumnAttribute[];
if (attributes != null && attributes.Length > 0)
dataSourceColumnName = attributes[0].Name;
else
dataSourceColumnName = property.Name;
// get column index, if not exist, set -1 to ignore.
try
{
ordinal = reader.GetOrdinal(dataSourceColumnName);
}
catch (Exception)
{
ordinal = -1;
}
// set value.
if (ordinal >= 0)
{
ITypeConverter typeConverter = TypeConverterFactory.GetConvertType(propType);
if (!propType.IsEnum)
{
property.SetValue(employee,
Convert.ChangeType(typeConverter.Convert(reader.GetValue(ordinal)), propType), null);
}
else
{
EnumConverter converter = typeConverter as EnumConverter;
property.SetValue(employee,
Convert.ChangeType(converter.Convert(propType, reader.GetValue(ordinal)), propType), null);
}
}
}
employees.Add(employee);
}
reader.Close();
db.Close();
foreach (Employee employee in employees)
{
Console.WriteLine("id: {0}, name: {1}, title: {2}, phone: {3}",
employee.EmployeeID, employee.FirstName + ' ' + employee.LastName, employee.Title, employee.Phone);
}
Console.WriteLine("");
Console.WriteLine("Press ENTER to exit.");
Console.ReadLine();
}
